feat: isolate Claude and Codex session sources

Persist platform_source across session creation, transcript ingestion, API query paths, and viewer state so Claude and Codex data can coexist without bleeding into each other. - add platform-source normalization helpers and persist platform_source in sdk_sessions via migration 24 with backfill and indexing - thread platformSource through CLI hooks, transcript processing, context generation, pagination, search routes, SSE payloads, and session management - expose source-aware project catalogs, viewer tabs, context preview selectors, and source badges for observations, prompts, and summaries - start the transcript watcher from the worker for transcript-based clients and preserve platform source during Codex ingestion - auto-start the worker from the MCP server for MCP-only clients and tighten stdio-driven cleanup during shutdown - keep createSDKSession backward compatible with existing custom-title callers while allowing explicit platform source forwarding
2026-04-25 17:15:04 +02:00 · 2026-03-24 08:43:56 -03:00
parent e2a230286d
commit 2b60dd2932
46 changed files with 3665 additions and 607 deletions
--- a/plugin/scripts/context-generator.cjs
+++ b/plugin/scripts/context-generator.cjs
--- a/plugin/scripts/mcp-server.cjs
+++ b/plugin/scripts/mcp-server.cjs
--- a/plugin/scripts/worker-service.cjs
+++ b/plugin/scripts/worker-service.cjs
--- a/plugin/ui/viewer-bundle.js
+++ b/plugin/ui/viewer-bundle.js
--- a/plugin/ui/viewer.html
+++ b/plugin/ui/viewer.html
@@ -355,6 +355,14 @@
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.03);
    }

+    .header-main {
+      display: flex;
+      align-items: center;
+      gap: 18px;
+      min-width: 0;
+      flex-wrap: wrap;
+    }
+
    .sidebar-header {
      padding: 14px 18px;
      border-bottom: 1px solid var(--color-border-primary);
@@ -549,6 +557,42 @@
      font-size: 13px;
    }

+    .source-tabs {
+      display: inline-flex;
+      align-items: center;
+      gap: 6px;
+      flex-wrap: wrap;
+    }
+
+    .source-tab {
+      background: transparent;
+      border: 1px solid var(--color-border-primary);
+      color: var(--color-text-secondary);
+      border-radius: 999px;
+      padding: 6px 12px;
+      font-size: 12px;
+      line-height: 1;
+      font-weight: 600;
+      letter-spacing: 0.01em;
+      cursor: pointer;
+      transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
+      white-space: nowrap;
+    }
+
+    .source-tab:hover {
+      background: var(--color-bg-card-hover);
+      border-color: var(--color-border-focus);
+      color: var(--color-text-primary);
+      transform: translateY(-1px);
+    }
+
+    .source-tab.active {
+      background: linear-gradient(135deg, var(--color-bg-button) 0%, var(--color-accent-primary) 100%);
+      border-color: var(--color-bg-button);
+      color: var(--color-text-button);
+      box-shadow: 0 2px 8px rgba(9, 105, 218, 0.18);
+    }
+
    .settings-btn,
    .theme-toggle-btn {
      background: var(--color-bg-card);
@@ -887,6 +931,49 @@
      letter-spacing: 0.5px;
    }

+    .card-source {
+      padding: 2px 8px;
+      border-radius: 999px;
+      font-weight: 600;
+      font-size: 10px;
+      letter-spacing: 0.04em;
+      text-transform: uppercase;
+      border: 1px solid transparent;
+    }
+
+    .source-claude {
+      background: rgba(255, 138, 61, 0.12);
+      color: #c25a00;
+      border-color: rgba(255, 138, 61, 0.22);
+    }
+
+    .source-codex {
+      background: rgba(33, 150, 243, 0.12);
+      color: #0f5ba7;
+      border-color: rgba(33, 150, 243, 0.24);
+    }
+
+    .source-cursor {
+      background: rgba(124, 58, 237, 0.12);
+      color: #6d28d9;
+      border-color: rgba(124, 58, 237, 0.24);
+    }
+
+    [data-theme="dark"] .source-claude {
+      color: #ffb067;
+      border-color: rgba(255, 176, 103, 0.2);
+    }
+
+    [data-theme="dark"] .source-codex {
+      color: #8fc7ff;
+      border-color: rgba(143, 199, 255, 0.2);
+    }
+
+    [data-theme="dark"] .source-cursor {
+      color: #c4b5fd;
+      border-color: rgba(196, 181, 253, 0.2);
+    }
+
    .card-title {
      font-size: 17px;
      margin-bottom: 14px;
@@ -1483,6 +1570,10 @@
        padding: 14px 20px;
      }

+      .header-main {
+        gap: 12px;
+      }
+
      .status {
        gap: 6px;
      }
@@ -1491,6 +1582,11 @@
        max-width: 160px;
      }

+      .source-tab {
+        padding: 6px 10px;
+        font-size: 11px;
+      }
+
      /* Hide icon links (docs, github, twitter) on tablet */
      .icon-link {
        display: none;
@@ -1544,6 +1640,27 @@
        gap: 8px;
      }

+      .header-main {
+        gap: 10px;
+      }
+
+      .source-tabs {
+        width: 100%;
+        overflow-x: auto;
+        padding-bottom: 2px;
+        scrollbar-width: none;
+      }
+
+      .source-tabs::-webkit-scrollbar {
+        display: none;
+      }
+
+      .source-tab {
+        flex-shrink: 0;
+        padding: 5px 10px;
+        font-size: 11px;
+      }
+
      .logomark {
        height: 28px;
      }
@@ -1732,6 +1849,11 @@
      white-space: nowrap;
    }

+    .preview-selector select:disabled {
+      opacity: 0.6;
+      cursor: not-allowed;
+    }
+
    .preview-selector select {
      background: var(--color-bg-card);
      border: 1px solid var(--color-border-primary);
@@ -2873,4 +2995,4 @@
  <script src="viewer-bundle.js"></script>
 </body>

-</html>
+</html>
--- a/src/cli/handlers/context.ts
+++ b/src/cli/handlers/context.ts
@@ -12,6 +12,7 @@ import { HOOK_EXIT_CODES } from '../../shared/hook-constants.js';
 import { logger } from '../../utils/logger.js';
 import { SettingsDefaultsManager } from '../../shared/SettingsDefaultsManager.js';
 import { USER_SETTINGS_PATH } from '../../shared/paths.js';
+import { normalizePlatformSource } from '../../shared/platform-source.js';

 export const contextHandler: EventHandler = {
  async execute(input: NormalizedHookInput): Promise<HookResult> {
@@ -31,6 +32,7 @@ export const contextHandler: EventHandler = {
    const cwd = input.cwd ?? process.cwd();
    const context = getProjectContext(cwd);
    const port = getWorkerPort();
+    const platformSource = normalizePlatformSource(input.platform);

    // Check if terminal output should be shown (load settings early)
    const settings = SettingsDefaultsManager.loadFromFile(USER_SETTINGS_PATH);
@@ -38,7 +40,7 @@ export const contextHandler: EventHandler = {

    // Pass all projects (parent + worktree if applicable) for unified timeline
    const projectsParam = context.allProjects.join(',');
-    const apiPath = `/api/context/inject?projects=${encodeURIComponent(projectsParam)}`;
+    const apiPath = `/api/context/inject?projects=${encodeURIComponent(projectsParam)}&platformSource=${encodeURIComponent(platformSource)}`;
    const colorApiPath = `${apiPath}&colors=true`;

    // Note: Removed AbortSignal.timeout due to Windows Bun cleanup issue (libuv assertion)
--- a/src/cli/handlers/file-edit.ts
+++ b/src/cli/handlers/file-edit.ts
@@ -9,6 +9,7 @@ import type { EventHandler, NormalizedHookInput, HookResult } from '../types.js'
 import { ensureWorkerRunning, workerHttpRequest } from '../../shared/worker-utils.js';
 import { logger } from '../../utils/logger.js';
 import { HOOK_EXIT_CODES } from '../../shared/hook-constants.js';
+import { normalizePlatformSource } from '../../shared/platform-source.js';

 export const fileEditHandler: EventHandler = {
  async execute(input: NormalizedHookInput): Promise<HookResult> {
@@ -20,6 +21,7 @@ export const fileEditHandler: EventHandler = {
    }

    const { sessionId, cwd, filePath, edits } = input;
+    const platformSource = normalizePlatformSource(input.platform);

    if (!filePath) {
      throw new Error('fileEditHandler requires filePath');
@@ -42,6 +44,7 @@ export const fileEditHandler: EventHandler = {
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          contentSessionId: sessionId,
+          platformSource,
          tool_name: 'write_file',
          tool_input: { filePath, edits },
          tool_response: { success: true },
--- a/src/cli/handlers/observation.ts
+++ b/src/cli/handlers/observation.ts
@@ -11,6 +11,7 @@ import { HOOK_EXIT_CODES } from '../../shared/hook-constants.js';
 import { isProjectExcluded } from '../../utils/project-filter.js';
 import { SettingsDefaultsManager } from '../../shared/SettingsDefaultsManager.js';
 import { USER_SETTINGS_PATH } from '../../shared/paths.js';
+import { normalizePlatformSource } from '../../shared/platform-source.js';

 export const observationHandler: EventHandler = {
  async execute(input: NormalizedHookInput): Promise<HookResult> {
@@ -22,6 +23,7 @@ export const observationHandler: EventHandler = {
    }

    const { sessionId, cwd, toolName, toolInput, toolResponse } = input;
+    const platformSource = normalizePlatformSource(input.platform);

    if (!toolName) {
      // No tool name provided - skip observation gracefully
@@ -51,6 +53,7 @@ export const observationHandler: EventHandler = {
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          contentSessionId: sessionId,
+          platformSource,
          tool_name: toolName,
          tool_input: toolInput,
          tool_response: toolResponse,
--- a/src/cli/handlers/session-complete.ts
+++ b/src/cli/handlers/session-complete.ts
@@ -12,6 +12,7 @@
 import type { EventHandler, NormalizedHookInput, HookResult } from '../types.js';
 import { ensureWorkerRunning, workerHttpRequest } from '../../shared/worker-utils.js';
 import { logger } from '../../utils/logger.js';
+import { normalizePlatformSource } from '../../shared/platform-source.js';

 export const sessionCompleteHandler: EventHandler = {
  async execute(input: NormalizedHookInput): Promise<HookResult> {
@@ -23,6 +24,7 @@ export const sessionCompleteHandler: EventHandler = {
    }

    const { sessionId } = input;
+    const platformSource = normalizePlatformSource(input.platform);

    if (!sessionId) {
      logger.warn('HOOK', 'session-complete: Missing sessionId, skipping');
@@ -39,7 +41,8 @@ export const sessionCompleteHandler: EventHandler = {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
-          contentSessionId: sessionId
+          contentSessionId: sessionId,
+          platformSource
        })
      });

--- a/src/cli/handlers/session-init.ts
+++ b/src/cli/handlers/session-init.ts
@@ -12,6 +12,7 @@ import { HOOK_EXIT_CODES } from '../../shared/hook-constants.js';
 import { isProjectExcluded } from '../../utils/project-filter.js';
 import { SettingsDefaultsManager } from '../../shared/SettingsDefaultsManager.js';
 import { USER_SETTINGS_PATH } from '../../shared/paths.js';
+import { normalizePlatformSource } from '../../shared/platform-source.js';

 export const sessionInitHandler: EventHandler = {
  async execute(input: NormalizedHookInput): Promise<HookResult> {
@@ -42,6 +43,7 @@ export const sessionInitHandler: EventHandler = {
    const prompt = (!rawPrompt || !rawPrompt.trim()) ? '[media prompt]' : rawPrompt;

    const project = getProjectName(cwd);
+    const platformSource = normalizePlatformSource(input.platform);

    logger.debug('HOOK', 'session-init: Calling /api/sessions/init', { contentSessionId: sessionId, project });

@@ -52,7 +54,8 @@ export const sessionInitHandler: EventHandler = {
      body: JSON.stringify({
        contentSessionId: sessionId,
        project,
-        prompt
+        prompt,
+        platformSource
      })
    });

--- a/src/servers/mcp-server.ts
+++ b/src/servers/mcp-server.ts
@@ -27,7 +27,8 @@ import {
  CallToolRequestSchema,
  ListToolsRequestSchema,
 } from '@modelcontextprotocol/sdk/types.js';
-import { workerHttpRequest } from '../shared/worker-utils.js';
+import { getWorkerPort, workerHttpRequest } from '../shared/worker-utils.js';
+import { ensureWorkerStarted } from '../services/worker-service.js';
 import { searchCodebase, formatSearchResults } from '../services/smart-file-read/search.js';
 import { parseFile, formatFoldedView, unfoldSymbol } from '../services/smart-file-read/parser.js';
 import { readFile } from 'node:fs/promises';
@@ -144,6 +145,26 @@ async function verifyWorkerConnection(): Promise<boolean> {
  }
 }

+/**
+ * Ensure Worker is available for Codex and other MCP-only clients.
+ * Claude hooks already start the worker; this path makes Codex turnkey.
+ */
+async function ensureWorkerConnection(): Promise<boolean> {
+  if (await verifyWorkerConnection()) {
+    return true;
+  }
+
+  logger.warn('SYSTEM', 'Worker not available, attempting auto-start for MCP client');
+
+  try {
+    const port = getWorkerPort();
+    return await ensureWorkerStarted(port);
+  } catch (error) {
+    logger.error('SYSTEM', 'Worker auto-start failed', undefined, error as Error);
+    return false;
+  }
+}
+
 /**
 * Tool definitions with HTTP-based handlers
 * Minimal descriptions - use help() tool with operation parameter for detailed docs
@@ -392,6 +413,30 @@ server.setRequestHandler(CallToolRequestSchema, async (request) => {
 // Prevents orphaned MCP server processes when Claude Code exits unexpectedly
 const HEARTBEAT_INTERVAL_MS = 30_000;
 let heartbeatTimer: ReturnType<typeof setInterval> | null = null;
+let isCleaningUp = false;
+
+function handleStdioClosed() {
+  cleanup('stdio-closed');
+}
+
+function handleStdioError(error: Error) {
+  logger.warn('SYSTEM', 'MCP stdio stream errored, shutting down', {
+    message: error.message
+  });
+  cleanup('stdio-error');
+}
+
+function attachStdioLifecycle() {
+  process.stdin.on('end', handleStdioClosed);
+  process.stdin.on('close', handleStdioClosed);
+  process.stdin.on('error', handleStdioError);
+}
+
+function detachStdioLifecycle() {
+  process.stdin.off('end', handleStdioClosed);
+  process.stdin.off('close', handleStdioClosed);
+  process.stdin.off('error', handleStdioError);
+}

 function startParentHeartbeat() {
  // ppid-based orphan detection only works on Unix
@@ -414,9 +459,13 @@ function startParentHeartbeat() {

 // Cleanup function — synchronous to ensure consistent behavior whether called
 // from signal handlers, heartbeat interval, or awaited in async context
-function cleanup() {
+function cleanup(reason: string = 'shutdown') {
+  if (isCleaningUp) return;
+  isCleaningUp = true;
+
  if (heartbeatTimer) clearInterval(heartbeatTimer);
-  logger.info('SYSTEM', 'MCP server shutting down');
+  detachStdioLifecycle();
+  logger.info('SYSTEM', 'MCP server shutting down', { reason });
  process.exit(0);
 }

@@ -428,6 +477,7 @@ process.on('SIGINT', cleanup);
 async function main() {
  // Start the MCP server
  const transport = new StdioServerTransport();
+  attachStdioLifecycle();
  await server.connect(transport);
  logger.info('SYSTEM', 'Claude-mem search server started');

@@ -436,7 +486,7 @@ async function main() {

  // Check Worker availability in background
  setTimeout(async () => {
-    const workerAvailable = await verifyWorkerConnection();
+    const workerAvailable = await ensureWorkerConnection();
    if (!workerAvailable) {
      logger.error('SYSTEM', 'Worker not available', undefined, {});
      logger.error('SYSTEM', 'Tools will fail until Worker is started');
--- a/src/services/context/ContextBuilder.ts
+++ b/src/services/context/ContextBuilder.ts
@@ -130,6 +130,7 @@ export async function generateContext(
  const config = loadContextConfig();
  const cwd = input?.cwd ?? process.cwd();
  const project = getProjectName(cwd);
+  const platformSource = input?.platform_source;

  // Use provided projects array (for worktree support) or fall back to single project
  const projects = input?.projects || [project];
@@ -149,11 +150,11 @@ export async function generateContext(
  try {
    // Query data for all projects (supports worktree: parent + worktree combined)
    const observations = projects.length > 1
-      ? queryObservationsMulti(db, projects, config)
-      : queryObservations(db, project, config);
+      ? queryObservationsMulti(db, projects, config, platformSource)
+      : queryObservations(db, project, config, platformSource);
    const summaries = projects.length > 1
-      ? querySummariesMulti(db, projects, config)
-      : querySummaries(db, project, config);
+      ? querySummariesMulti(db, projects, config, platformSource)
+      : querySummaries(db, project, config, platformSource);

    // Handle empty state
    if (observations.length === 0 && summaries.length === 0) {
--- a/src/services/context/ObservationCompiler.ts
+++ b/src/services/context/ObservationCompiler.ts
@@ -25,7 +25,8 @@ import { SUMMARY_LOOKAHEAD } from './types.js';
 export function queryObservations(
  db: SessionStore,
  project: string,
-  config: ContextConfig
+  config: ContextConfig,
+  platformSource?: string
 ): Observation[] {
  const typeArray = Array.from(config.observationTypes);
  const typePlaceholders = typeArray.map(() => '?').join(',');
@@ -34,19 +35,38 @@ export function queryObservations(

  return db.db.prepare(`
    SELECT
-      id, memory_session_id, type, title, subtitle, narrative,
-      facts, concepts, files_read, files_modified, discovery_tokens,
-      created_at, created_at_epoch
-    FROM observations
-    WHERE project = ?
+      o.id,
+      o.memory_session_id,
+      COALESCE(s.platform_source, 'claude') as platform_source,
+      o.type,
+      o.title,
+      o.subtitle,
+      o.narrative,
+      o.facts,
+      o.concepts,
+      o.files_read,
+      o.files_modified,
+      o.discovery_tokens,
+      o.created_at,
+      o.created_at_epoch
+    FROM observations o
+    LEFT JOIN sdk_sessions s ON o.memory_session_id = s.memory_session_id
+    WHERE o.project = ?
      AND type IN (${typePlaceholders})
      AND EXISTS (
-        SELECT 1 FROM json_each(concepts)
+        SELECT 1 FROM json_each(o.concepts)
        WHERE value IN (${conceptPlaceholders})
      )
-    ORDER BY created_at_epoch DESC
+      ${platformSource ? "AND COALESCE(s.platform_source, 'claude') = ?" : ''}
+    ORDER BY o.created_at_epoch DESC
    LIMIT ?
-  `).all(project, ...typeArray, ...conceptArray, config.totalObservationCount) as Observation[];
+  `).all(
+    project,
+    ...typeArray,
+    ...conceptArray,
+    ...(platformSource ? [platformSource] : []),
+    config.totalObservationCount
+  ) as Observation[];
 }

 /**
@@ -55,15 +75,30 @@ export function queryObservations(
 export function querySummaries(
  db: SessionStore,
  project: string,
-  config: ContextConfig
+  config: ContextConfig,
+  platformSource?: string
 ): SessionSummary[] {
  return db.db.prepare(`
-    SELECT id, memory_session_id, request, investigated, learned, completed, next_steps, created_at, created_at_epoch
-    FROM session_summaries
-    WHERE project = ?
-    ORDER BY created_at_epoch DESC
+    SELECT
+      ss.id,
+      ss.memory_session_id,
+      COALESCE(s.platform_source, 'claude') as platform_source,
+      ss.request,
+      ss.investigated,
+      ss.learned,
+      ss.completed,
+      ss.next_steps,
+      ss.created_at,
+      ss.created_at_epoch
+    FROM session_summaries ss
+    LEFT JOIN sdk_sessions s ON ss.memory_session_id = s.memory_session_id
+    WHERE ss.project = ?
+      ${platformSource ? "AND COALESCE(s.platform_source, 'claude') = ?" : ''}
+    ORDER BY ss.created_at_epoch DESC
    LIMIT ?
-  `).all(project, config.sessionCount + SUMMARY_LOOKAHEAD) as SessionSummary[];
+  `).all(
+    ...[project, ...(platformSource ? [platformSource] : []), config.sessionCount + SUMMARY_LOOKAHEAD]
+  ) as SessionSummary[];
 }

 /**
@@ -75,7 +110,8 @@ export function querySummaries(
 export function queryObservationsMulti(
  db: SessionStore,
  projects: string[],
-  config: ContextConfig
+  config: ContextConfig,
+  platformSource?: string
 ): Observation[] {
  const typeArray = Array.from(config.observationTypes);
  const typePlaceholders = typeArray.map(() => '?').join(',');
@@ -87,19 +123,39 @@ export function queryObservationsMulti(

  return db.db.prepare(`
    SELECT
-      id, memory_session_id, type, title, subtitle, narrative,
-      facts, concepts, files_read, files_modified, discovery_tokens,
-      created_at, created_at_epoch, project
-    FROM observations
-    WHERE project IN (${projectPlaceholders})
+      o.id,
+      o.memory_session_id,
+      COALESCE(s.platform_source, 'claude') as platform_source,
+      o.type,
+      o.title,
+      o.subtitle,
+      o.narrative,
+      o.facts,
+      o.concepts,
+      o.files_read,
+      o.files_modified,
+      o.discovery_tokens,
+      o.created_at,
+      o.created_at_epoch,
+      o.project
+    FROM observations o
+    LEFT JOIN sdk_sessions s ON o.memory_session_id = s.memory_session_id
+    WHERE o.project IN (${projectPlaceholders})
      AND type IN (${typePlaceholders})
      AND EXISTS (
-        SELECT 1 FROM json_each(concepts)
+        SELECT 1 FROM json_each(o.concepts)
        WHERE value IN (${conceptPlaceholders})
      )
-    ORDER BY created_at_epoch DESC
+      ${platformSource ? "AND COALESCE(s.platform_source, 'claude') = ?" : ''}
+    ORDER BY o.created_at_epoch DESC
    LIMIT ?
-  `).all(...projects, ...typeArray, ...conceptArray, config.totalObservationCount) as Observation[];
+  `).all(
+    ...projects,
+    ...typeArray,
+    ...conceptArray,
+    ...(platformSource ? [platformSource] : []),
+    config.totalObservationCount
+  ) as Observation[];
 }

 /**
@@ -111,18 +167,32 @@ export function queryObservationsMulti(
 export function querySummariesMulti(
  db: SessionStore,
  projects: string[],
-  config: ContextConfig
+  config: ContextConfig,
+  platformSource?: string
 ): SessionSummary[] {
  // Build IN clause for projects
  const projectPlaceholders = projects.map(() => '?').join(',');

  return db.db.prepare(`
-    SELECT id, memory_session_id, request, investigated, learned, completed, next_steps, created_at, created_at_epoch, project
-    FROM session_summaries
-    WHERE project IN (${projectPlaceholders})
-    ORDER BY created_at_epoch DESC
+    SELECT
+      ss.id,
+      ss.memory_session_id,
+      COALESCE(s.platform_source, 'claude') as platform_source,
+      ss.request,
+      ss.investigated,
+      ss.learned,
+      ss.completed,
+      ss.next_steps,
+      ss.created_at,
+      ss.created_at_epoch,
+      ss.project
+    FROM session_summaries ss
+    LEFT JOIN sdk_sessions s ON ss.memory_session_id = s.memory_session_id
+    WHERE ss.project IN (${projectPlaceholders})
+      ${platformSource ? "AND COALESCE(s.platform_source, 'claude') = ?" : ''}
+    ORDER BY ss.created_at_epoch DESC
    LIMIT ?
-  `).all(...projects, config.sessionCount + SUMMARY_LOOKAHEAD) as SessionSummary[];
+  `).all(...projects, ...(platformSource ? [platformSource] : []), config.sessionCount + SUMMARY_LOOKAHEAD) as SessionSummary[];
 }

 /**
--- a/src/services/context/types.ts
+++ b/src/services/context/types.ts
@@ -15,6 +15,7 @@ export interface ContextInput {
  projects?: string[];
  /** When true, return ALL observations with no limit */
  full?: boolean;
+  platform_source?: string;
  [key: string]: any;
 }

@@ -49,6 +50,7 @@ export interface ContextConfig {
 export interface Observation {
  id: number;
  memory_session_id: string;
+  platform_source?: string;
  type: string;
  title: string | null;
  subtitle: string | null;
@@ -70,6 +72,7 @@ export interface Observation {
 export interface SessionSummary {
  id: number;
  memory_session_id: string;
+  platform_source?: string;
  request: string | null;
  investigated: string | null;
  learned: string | null;
--- a/src/services/sqlite/SessionSearch.ts
+++ b/src/services/sqlite/SessionSearch.ts
@@ -3,6 +3,7 @@ import { TableNameRow } from '../../types/database.js';
 import { DATA_DIR, DB_PATH, ensureDir } from '../../shared/paths.js';
 import { logger } from '../../utils/logger.js';
 import { isDirectChild } from '../../shared/path-utils.js';
+import { AppError } from '../server/ErrorHandler.js';
 import {
  ObservationSearchResult,
  SessionSummarySearchResult,
@@ -22,6 +23,8 @@ import {
 export class SessionSearch {
  private db: Database;

+  private static readonly MISSING_SEARCH_INPUT_MESSAGE = 'Either query or filters required for search';
+
  constructor(dbPath?: string) {
    if (!dbPath) {
      ensureDir(DATA_DIR);
@@ -280,7 +283,7 @@ export class SessionSearch {
    if (!query) {
      const filterClause = this.buildFilterClause(filters, params, 'o');
      if (!filterClause) {
-        throw new Error('Either query or filters required for search');
+        throw new AppError(SessionSearch.MISSING_SEARCH_INPUT_MESSAGE, 400, 'INVALID_SEARCH_REQUEST');
      }

      const orderClause = this.buildOrderClause(orderBy, false);
@@ -317,7 +320,7 @@ export class SessionSearch {
      delete filterOptions.type;
      const filterClause = this.buildFilterClause(filterOptions, params, 's');
      if (!filterClause) {
-        throw new Error('Either query or filters required for search');
+        throw new AppError(SessionSearch.MISSING_SEARCH_INPUT_MESSAGE, 400, 'INVALID_SEARCH_REQUEST');
      }

      const orderClause = orderBy === 'date_asc'
@@ -551,7 +554,7 @@ export class SessionSearch {
    // FILTER-ONLY PATH: When no query text, query user_prompts table directly
    if (!query) {
      if (baseConditions.length === 0) {
-        throw new Error('Either query or filters required for search');
+        throw new AppError(SessionSearch.MISSING_SEARCH_INPUT_MESSAGE, 400, 'INVALID_SEARCH_REQUEST');
      }

      const whereClause = `WHERE ${baseConditions.join(' AND ')}`;
--- a/src/services/sqlite/SessionStore.ts
+++ b/src/services/sqlite/SessionStore.ts
@@ -14,6 +14,17 @@ import {
 } from '../../types/database.js';
 import type { PendingMessageStore } from './PendingMessageStore.js';
 import { computeObservationContentHash, findDuplicateObservation } from './observations/store.js';
+import { DEFAULT_PLATFORM_SOURCE, normalizePlatformSource, sortPlatformSources } from '../../shared/platform-source.js';
+
+function resolveCreateSessionArgs(
+  customTitle?: string,
+  platformSource?: string
+): { customTitle?: string; platformSource: string } {
+  return {
+    customTitle,
+    platformSource: platformSource ?? DEFAULT_PLATFORM_SOURCE
+  };
+}

 /**
 * Session data store for SDK sessions, observations, and summaries
@@ -51,6 +62,7 @@ export class SessionStore {
    this.addOnUpdateCascadeToForeignKeys();
    this.addObservationContentHashColumn();
    this.addSessionCustomTitleColumn();
+    this.addSessionPlatformSourceColumn();
  }

  /**
@@ -78,6 +90,7 @@ export class SessionStore {
        content_session_id TEXT UNIQUE NOT NULL,
        memory_session_id TEXT UNIQUE,
        project TEXT NOT NULL,
+        platform_source TEXT NOT NULL DEFAULT 'claude',
        user_prompt TEXT,
        started_at TEXT NOT NULL,
        started_at_epoch INTEGER NOT NULL,
@@ -875,6 +888,31 @@ export class SessionStore {
    this.db.prepare('INSERT OR IGNORE INTO schema_versions (version, applied_at) VALUES (?, ?)').run(23, new Date().toISOString());
  }

+  /**
+   * Add platform_source column to sdk_sessions for Claude/Codex isolation (migration 24)
+   */
+  private addSessionPlatformSourceColumn(): void {
+    const applied = this.db.prepare('SELECT version FROM schema_versions WHERE version = ?').get(24) as SchemaVersion | undefined;
+    if (applied) return;
+
+    const tableInfo = this.db.query('PRAGMA table_info(sdk_sessions)').all() as TableColumnInfo[];
+    const hasColumn = tableInfo.some(col => col.name === 'platform_source');
+
+    if (!hasColumn) {
+      this.db.run(`ALTER TABLE sdk_sessions ADD COLUMN platform_source TEXT NOT NULL DEFAULT '${DEFAULT_PLATFORM_SOURCE}'`);
+      logger.debug('DB', 'Added platform_source column to sdk_sessions table');
+    }
+
+    this.db.run(`
+      UPDATE sdk_sessions
+      SET platform_source = '${DEFAULT_PLATFORM_SOURCE}'
+      WHERE platform_source IS NULL OR platform_source = ''
+    `);
+    this.db.run('CREATE INDEX IF NOT EXISTS idx_sdk_sessions_platform_source ON sdk_sessions(platform_source)');
+
+    this.db.prepare('INSERT OR IGNORE INTO schema_versions (version, applied_at) VALUES (?, ?)').run(24, new Date().toISOString());
+  }
+
  /**
   * Update the memory session ID for a session
   * Called by SDKAgent when it captures the session ID from the first SDK message
@@ -1002,14 +1040,26 @@ export class SessionStore {
    subtitle: string | null;
    text: string;
    project: string;
+    platform_source: string;
    prompt_number: number | null;
    created_at: string;
    created_at_epoch: number;
  }> {
    const stmt = this.db.prepare(`
-      SELECT id, type, title, subtitle, text, project, prompt_number, created_at, created_at_epoch
-      FROM observations
-      ORDER BY created_at_epoch DESC
+      SELECT
+        o.id,
+        o.type,
+        o.title,
+        o.subtitle,
+        o.text,
+        o.project,
+        COALESCE(s.platform_source, '${DEFAULT_PLATFORM_SOURCE}') as platform_source,
+        o.prompt_number,
+        o.created_at,
+        o.created_at_epoch
+      FROM observations o
+      LEFT JOIN sdk_sessions s ON o.memory_session_id = s.memory_session_id
+      ORDER BY o.created_at_epoch DESC
      LIMIT ?
    `);

@@ -1030,16 +1080,30 @@ export class SessionStore {
    files_edited: string | null;
    notes: string | null;
    project: string;
+    platform_source: string;
    prompt_number: number | null;
    created_at: string;
    created_at_epoch: number;
  }> {
    const stmt = this.db.prepare(`
-      SELECT id, request, investigated, learned, completed, next_steps,
-             files_read, files_edited, notes, project, prompt_number,
-             created_at, created_at_epoch
-      FROM session_summaries
-      ORDER BY created_at_epoch DESC
+      SELECT
+        ss.id,
+        ss.request,
+        ss.investigated,
+        ss.learned,
+        ss.completed,
+        ss.next_steps,
+        ss.files_read,
+        ss.files_edited,
+        ss.notes,
+        ss.project,
+        COALESCE(s.platform_source, '${DEFAULT_PLATFORM_SOURCE}') as platform_source,
+        ss.prompt_number,
+        ss.created_at,
+        ss.created_at_epoch
+      FROM session_summaries ss
+      LEFT JOIN sdk_sessions s ON ss.memory_session_id = s.memory_session_id
+      ORDER BY ss.created_at_epoch DESC
      LIMIT ?
    `);

@@ -1053,6 +1117,7 @@ export class SessionStore {
    id: number;
    content_session_id: string;
    project: string;
+    platform_source: string;
    prompt_number: number;
    prompt_text: string;
    created_at: string;
@@ -1063,6 +1128,7 @@ export class SessionStore {
        up.id,
        up.content_session_id,
        s.project,
+        COALESCE(s.platform_source, '${DEFAULT_PLATFORM_SOURCE}') as platform_source,
        up.prompt_number,
        up.prompt_text,
        up.created_at,
@@ -1079,18 +1145,74 @@ export class SessionStore {
  /**
   * Get all unique projects from the database (for web UI project filter)
   */
-  getAllProjects(): string[] {
-    const stmt = this.db.prepare(`
+  getAllProjects(platformSource?: string): string[] {
+    const normalizedPlatformSource = platformSource ? normalizePlatformSource(platformSource) : undefined;
+    let query = `
      SELECT DISTINCT project
      FROM sdk_sessions
      WHERE project IS NOT NULL AND project != ''
-      ORDER BY project ASC
-    `);
+    `;
+    const params: unknown[] = [];

-    const rows = stmt.all() as Array<{ project: string }>;
+    if (normalizedPlatformSource) {
+      query += ' AND COALESCE(platform_source, ?) = ?';
+      params.push(DEFAULT_PLATFORM_SOURCE, normalizedPlatformSource);
+    }
+
+    query += ' ORDER BY project ASC';
+
+    const rows = this.db.prepare(query).all(...params) as Array<{ project: string }>;
    return rows.map(row => row.project);
  }

+  getProjectCatalog(): {
+    projects: string[];
+    sources: string[];
+    projectsBySource: Record<string, string[]>;
+  } {
+    const rows = this.db.prepare(`
+      SELECT
+        COALESCE(platform_source, '${DEFAULT_PLATFORM_SOURCE}') as platform_source,
+        project,
+        MAX(started_at_epoch) as latest_epoch
+      FROM sdk_sessions
+      WHERE project IS NOT NULL AND project != ''
+      GROUP BY COALESCE(platform_source, '${DEFAULT_PLATFORM_SOURCE}'), project
+      ORDER BY latest_epoch DESC
+    `).all() as Array<{ platform_source: string; project: string; latest_epoch: number }>;
+
+    const projects: string[] = [];
+    const seenProjects = new Set<string>();
+    const projectsBySource: Record<string, string[]> = {};
+
+    for (const row of rows) {
+      const source = normalizePlatformSource(row.platform_source);
+
+      if (!projectsBySource[source]) {
+        projectsBySource[source] = [];
+      }
+
+      if (!projectsBySource[source].includes(row.project)) {
+        projectsBySource[source].push(row.project);
+      }
+
+      if (!seenProjects.has(row.project)) {
+        seenProjects.add(row.project);
+        projects.push(row.project);
+      }
+    }
+
+    const sources = sortPlatformSources(Object.keys(projectsBySource));
+
+    return {
+      projects,
+      sources,
+      projectsBySource: Object.fromEntries(
+        sources.map(source => [source, projectsBySource[source] || []])
+      )
+    };
+  }
+
  /**
   * Get latest user prompt with session info for a Claude session
   * Used for syncing prompts to Chroma during session initialization
@@ -1100,6 +1222,7 @@ export class SessionStore {
    content_session_id: string;
    memory_session_id: string;
    project: string;
+    platform_source: string;
    prompt_number: number;
    prompt_text: string;
    created_at_epoch: number;
@@ -1108,7 +1231,8 @@ export class SessionStore {
      SELECT
        up.*,
        s.memory_session_id,
-        s.project
+        s.project,
+        COALESCE(s.platform_source, '${DEFAULT_PLATFORM_SOURCE}') as platform_source
      FROM user_prompts up
      JOIN sdk_sessions s ON up.content_session_id = s.content_session_id
      WHERE up.content_session_id = ?
@@ -1339,11 +1463,14 @@ export class SessionStore {
    content_session_id: string;
    memory_session_id: string | null;
    project: string;
+    platform_source: string;
    user_prompt: string;
    custom_title: string | null;
  } | null {
    const stmt = this.db.prepare(`
-      SELECT id, content_session_id, memory_session_id, project, user_prompt, custom_title
+      SELECT id, content_session_id, memory_session_id, project,
+             COALESCE(platform_source, '${DEFAULT_PLATFORM_SOURCE}') as platform_source,
+             user_prompt, custom_title
      FROM sdk_sessions
      WHERE id = ?
      LIMIT 1
@@ -1361,6 +1488,7 @@ export class SessionStore {
    content_session_id: string;
    memory_session_id: string;
    project: string;
+    platform_source: string;
    user_prompt: string;
    custom_title: string | null;
    started_at: string;
@@ -1373,7 +1501,9 @@ export class SessionStore {

    const placeholders = memorySessionIds.map(() => '?').join(',');
    const stmt = this.db.prepare(`
-      SELECT id, content_session_id, memory_session_id, project, user_prompt, custom_title,
+      SELECT id, content_session_id, memory_session_id, project,
+             COALESCE(platform_source, '${DEFAULT_PLATFORM_SOURCE}') as platform_source,
+             user_prompt, custom_title,
             started_at, started_at_epoch, completed_at, completed_at_epoch, status
      FROM sdk_sessions
      WHERE memory_session_id IN (${placeholders})
@@ -1418,9 +1548,17 @@ export class SessionStore {
   * Pure get-or-create: never modifies memory_session_id.
   * Multi-terminal isolation is handled by ON UPDATE CASCADE at the schema level.
   */
-  createSDKSession(contentSessionId: string, project: string, userPrompt: string, customTitle?: string): number {
+  createSDKSession(
+    contentSessionId: string,
+    project: string,
+    userPrompt: string,
+    customTitle?: string,
+    platformSource?: string
+  ): number {
    const now = new Date();
    const nowEpoch = now.getTime();
+    const resolved = resolveCreateSessionArgs(customTitle, platformSource);
+    const normalizedPlatformSource = normalizePlatformSource(resolved.platformSource);

    // Session reuse: Return existing session ID if already created for this contentSessionId.
    const existing = this.db.prepare(`
@@ -1436,12 +1574,17 @@ export class SessionStore {
        `).run(project, contentSessionId);
      }
      // Backfill custom_title if provided and not yet set
-      if (customTitle) {
+      if (resolved.customTitle) {
        this.db.prepare(`
          UPDATE sdk_sessions SET custom_title = ?
          WHERE content_session_id = ? AND custom_title IS NULL
-        `).run(customTitle, contentSessionId);
+        `).run(resolved.customTitle, contentSessionId);
      }
+      this.db.prepare(`
+        UPDATE sdk_sessions SET platform_source = ?
+        WHERE content_session_id = ?
+          AND COALESCE(platform_source, '') != ?
+      `).run(normalizedPlatformSource, contentSessionId, normalizedPlatformSource);
      return existing.id;
    }

@@ -1451,9 +1594,9 @@ export class SessionStore {
    // must NEVER equal contentSessionId - that would inject memory messages into the user's transcript!
    this.db.prepare(`
      INSERT INTO sdk_sessions
-      (content_session_id, memory_session_id, project, user_prompt, custom_title, started_at, started_at_epoch, status)
-      VALUES (?, NULL, ?, ?, ?, ?, ?, 'active')
-    `).run(contentSessionId, project, userPrompt, customTitle || null, now.toISOString(), nowEpoch);
+      (content_session_id, memory_session_id, project, platform_source, user_prompt, custom_title, started_at, started_at_epoch, status)
+      VALUES (?, NULL, ?, ?, ?, ?, ?, ?, 'active')
+    `).run(contentSessionId, project, normalizedPlatformSource, userPrompt, resolved.customTitle || null, now.toISOString(), nowEpoch);

    // Return new ID
    const row = this.db.prepare('SELECT id FROM sdk_sessions WHERE content_session_id = ?')
@@ -2233,9 +2376,9 @@ export class SessionStore {
    // Create new manual session
    const now = new Date();
    this.db.prepare(`
-      INSERT INTO sdk_sessions (memory_session_id, content_session_id, project, started_at, started_at_epoch, status)
-      VALUES (?, ?, ?, ?, ?, 'active')
-    `).run(memorySessionId, contentSessionId, project, now.toISOString(), now.getTime());
+      INSERT INTO sdk_sessions (memory_session_id, content_session_id, project, platform_source, started_at, started_at_epoch, status)
+      VALUES (?, ?, ?, ?, ?, ?, 'active')
+    `).run(memorySessionId, contentSessionId, project, DEFAULT_PLATFORM_SOURCE, now.toISOString(), now.getTime());

    logger.info('SESSION', 'Created manual session', { memorySessionId, project });

@@ -2261,6 +2404,7 @@ export class SessionStore {
    content_session_id: string;
    memory_session_id: string;
    project: string;
+    platform_source?: string;
    user_prompt: string;
    started_at: string;
    started_at_epoch: number;
@@ -2279,15 +2423,16 @@ export class SessionStore {

    const stmt = this.db.prepare(`
      INSERT INTO sdk_sessions (
-        content_session_id, memory_session_id, project, user_prompt,
+        content_session_id, memory_session_id, project, platform_source, user_prompt,
        started_at, started_at_epoch, completed_at, completed_at_epoch, status
-      ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
+      ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
    `);

    const result = stmt.run(
      session.content_session_id,
      session.memory_session_id,
      session.project,
+      normalizePlatformSource(session.platform_source),
      session.user_prompt,
      session.started_at,
      session.started_at_epoch,
--- a/src/services/sqlite/migrations/runner.ts
+++ b/src/services/sqlite/migrations/runner.ts
@@ -6,6 +6,7 @@ import {
  TableNameRow,
  SchemaVersion
 } from '../../../types/database.js';
+import { DEFAULT_PLATFORM_SOURCE } from '../../../shared/platform-source.js';

 /**
 * MigrationRunner handles all database schema migrations
@@ -34,6 +35,7 @@ export class MigrationRunner {
    this.addOnUpdateCascadeToForeignKeys();
    this.addObservationContentHashColumn();
    this.addSessionCustomTitleColumn();
+    this.addSessionPlatformSourceColumn();
  }

  /**
@@ -61,6 +63,7 @@ export class MigrationRunner {
        content_session_id TEXT UNIQUE NOT NULL,
        memory_session_id TEXT UNIQUE,
        project TEXT NOT NULL,
+        platform_source TEXT NOT NULL DEFAULT 'claude',
        user_prompt TEXT,
        started_at TEXT NOT NULL,
        started_at_epoch INTEGER NOT NULL,
@@ -863,4 +866,29 @@ export class MigrationRunner {

    this.db.prepare('INSERT OR IGNORE INTO schema_versions (version, applied_at) VALUES (?, ?)').run(23, new Date().toISOString());
  }
+
+  /**
+   * Add platform_source column to sdk_sessions for Claude/Codex isolation (migration 24)
+   */
+  private addSessionPlatformSourceColumn(): void {
+    const applied = this.db.prepare('SELECT version FROM schema_versions WHERE version = ?').get(24) as SchemaVersion | undefined;
+    if (applied) return;
+
+    const tableInfo = this.db.query('PRAGMA table_info(sdk_sessions)').all() as TableColumnInfo[];
+    const hasColumn = tableInfo.some(col => col.name === 'platform_source');
+
+    if (!hasColumn) {
+      this.db.run(`ALTER TABLE sdk_sessions ADD COLUMN platform_source TEXT NOT NULL DEFAULT '${DEFAULT_PLATFORM_SOURCE}'`);
+      logger.debug('DB', 'Added platform_source column to sdk_sessions table');
+    }
+
+    this.db.run(`
+      UPDATE sdk_sessions
+      SET platform_source = '${DEFAULT_PLATFORM_SOURCE}'
+      WHERE platform_source IS NULL OR platform_source = ''
+    `);
+    this.db.run('CREATE INDEX IF NOT EXISTS idx_sdk_sessions_platform_source ON sdk_sessions(platform_source)');
+
+    this.db.prepare('INSERT OR IGNORE INTO schema_versions (version, applied_at) VALUES (?, ?)').run(24, new Date().toISOString());
+  }
 }
--- a/src/services/sqlite/sessions/create.ts
+++ b/src/services/sqlite/sessions/create.ts
@@ -5,6 +5,17 @@

 import type { Database } from 'bun:sqlite';
 import { logger } from '../../../utils/logger.js';
+import { DEFAULT_PLATFORM_SOURCE, normalizePlatformSource } from '../../../shared/platform-source.js';
+
+function resolveCreateSessionArgs(
+  customTitle?: string,
+  platformSource?: string
+): { customTitle?: string; platformSource: string } {
+  return {
+    customTitle,
+    platformSource: platformSource ?? DEFAULT_PLATFORM_SOURCE
+  };
+}

 /**
 * Create a new SDK session (idempotent - returns existing session ID if already exists)
@@ -22,10 +33,13 @@ export function createSDKSession(
  contentSessionId: string,
  project: string,
  userPrompt: string,
-  customTitle?: string
+  customTitle?: string,
+  platformSource?: string
 ): number {
  const now = new Date();
  const nowEpoch = now.getTime();
+  const resolved = resolveCreateSessionArgs(customTitle, platformSource);
+  const normalizedPlatformSource = normalizePlatformSource(resolved.platformSource);

  // Check for existing session
  const existing = db.prepare(`
@@ -41,12 +55,17 @@ export function createSDKSession(
      `).run(project, contentSessionId);
    }
    // Backfill custom_title if provided and not yet set
-    if (customTitle) {
+    if (resolved.customTitle) {
      db.prepare(`
        UPDATE sdk_sessions SET custom_title = ?
        WHERE content_session_id = ? AND custom_title IS NULL
-      `).run(customTitle, contentSessionId);
+      `).run(resolved.customTitle, contentSessionId);
    }
+    db.prepare(`
+      UPDATE sdk_sessions SET platform_source = ?
+      WHERE content_session_id = ?
+        AND COALESCE(platform_source, '') != ?
+    `).run(normalizedPlatformSource, contentSessionId, normalizedPlatformSource);
    return existing.id;
  }

@@ -56,9 +75,9 @@ export function createSDKSession(
  // must NEVER equal contentSessionId - that would inject memory messages into the user's transcript!
  db.prepare(`
    INSERT INTO sdk_sessions
-    (content_session_id, memory_session_id, project, user_prompt, custom_title, started_at, started_at_epoch, status)
-    VALUES (?, NULL, ?, ?, ?, ?, ?, 'active')
-  `).run(contentSessionId, project, userPrompt, customTitle || null, now.toISOString(), nowEpoch);
+    (content_session_id, memory_session_id, project, platform_source, user_prompt, custom_title, started_at, started_at_epoch, status)
+    VALUES (?, NULL, ?, ?, ?, ?, ?, ?, 'active')
+  `).run(contentSessionId, project, normalizedPlatformSource, userPrompt, resolved.customTitle || null, now.toISOString(), nowEpoch);

  // Return new ID
  const row = db.prepare('SELECT id FROM sdk_sessions WHERE content_session_id = ?')
--- a/src/services/transcripts/processor.ts
+++ b/src/services/transcripts/processor.ts
@@ -9,9 +9,11 @@ import { writeAgentsMd } from '../../utils/agents-md-utils.js';
 import { resolveFieldSpec, resolveFields, matchesRule } from './field-utils.js';
 import { expandHomePath } from './config.js';
 import type { TranscriptSchema, WatchTarget, SchemaEvent } from './types.js';
+import { normalizePlatformSource } from '../../shared/platform-source.js';

 interface SessionState {
  sessionId: string;
+  platformSource: string;
  cwd?: string;
  project?: string;
  lastUserMessage?: string;
@@ -51,6 +53,7 @@ export class TranscriptEventProcessor {
    if (!session) {
      session = {
        sessionId,
+        platformSource: normalizePlatformSource(watch.name),
        pendingTools: new Map()
      };
      this.sessions.set(key, session);
@@ -181,7 +184,7 @@ export class TranscriptEventProcessor {
      sessionId: session.sessionId,
      cwd,
      prompt,
-      platform: 'transcript'
+      platform: session.platformSource
    });
  }

@@ -250,7 +253,7 @@ export class TranscriptEventProcessor {
      toolName,
      toolInput: this.maybeParseJson(fields.toolInput),
      toolResponse: this.maybeParseJson(fields.toolResponse),
-      platform: 'transcript'
+      platform: session.platformSource
    });
  }

@@ -263,7 +266,7 @@ export class TranscriptEventProcessor {
      cwd: session.cwd ?? process.cwd(),
      filePath,
      edits: Array.isArray(fields.edits) ? fields.edits : undefined,
-      platform: 'transcript'
+      platform: session.platformSource
    });
  }

@@ -305,7 +308,7 @@ export class TranscriptEventProcessor {
    await sessionCompleteHandler.execute({
      sessionId: session.sessionId,
      cwd: session.cwd ?? process.cwd(),
-      platform: 'transcript'
+      platform: session.platformSource
    });
    await this.updateContext(session, watch);
    session.pendingTools.clear();
@@ -325,7 +328,8 @@ export class TranscriptEventProcessor {
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          contentSessionId: session.sessionId,
-          last_assistant_message: lastAssistantMessage
+          last_assistant_message: lastAssistantMessage,
+          platformSource: session.platformSource
        })
      });
    } catch (error) {
@@ -350,7 +354,7 @@ export class TranscriptEventProcessor {

    try {
      const response = await workerHttpRequest(
-        `/api/context/inject?projects=${encodeURIComponent(projectsParam)}`
+        `/api/context/inject?projects=${encodeURIComponent(projectsParam)}&platformSource=${encodeURIComponent(session.platformSource)}`
      );
      if (!response.ok) return;

--- a/src/services/transcripts/watcher.ts
+++ b/src/services/transcripts/watcher.ts
@@ -117,15 +117,15 @@ export class TranscriptWatcher {
    const files = this.resolveWatchFiles(resolvedPath);

    for (const filePath of files) {
-      await this.addTailer(filePath, watch, schema);
+      await this.addTailer(filePath, watch, schema, true);
    }

    const rescanIntervalMs = watch.rescanIntervalMs ?? 5000;
-    const timer = setInterval(async () => {
+      const timer = setInterval(async () => {
      const newFiles = this.resolveWatchFiles(resolvedPath);
      for (const filePath of newFiles) {
        if (!this.tailers.has(filePath)) {
-          await this.addTailer(filePath, watch, schema);
+          await this.addTailer(filePath, watch, schema, false);
        }
      }
    }, rescanIntervalMs);
@@ -164,13 +164,20 @@ export class TranscriptWatcher {
    return /[*?[\]{}()]/.test(inputPath);
  }

-  private async addTailer(filePath: string, watch: WatchTarget, schema: TranscriptSchema): Promise<void> {
+  private async addTailer(
+    filePath: string,
+    watch: WatchTarget,
+    schema: TranscriptSchema,
+    initialDiscovery: boolean
+  ): Promise<void> {
    if (this.tailers.has(filePath)) return;

    const sessionIdOverride = this.extractSessionIdFromPath(filePath);

    let offset = this.state.offsets[filePath] ?? 0;
-    if (offset === 0 && watch.startAtEnd) {
+    // `startAtEnd` is useful on worker startup to avoid replaying the full backlog,
+    // but new transcript files must be read from byte 0 or we lose session_meta/user_message.
+    if (offset === 0 && watch.startAtEnd && initialDiscovery) {
      try {
        offset = statSync(filePath).size;
      } catch {
--- a/src/services/worker-service.ts
+++ b/src/services/worker-service.ts
@@ -115,6 +115,8 @@ import { SearchManager } from './worker/SearchManager.js';
 import { FormattingService } from './worker/FormattingService.js';
 import { TimelineService } from './worker/TimelineService.js';
 import { SessionEventBroadcaster } from './worker/events/SessionEventBroadcaster.js';
+import { DEFAULT_CONFIG_PATH, DEFAULT_STATE_PATH, expandHomePath, loadTranscriptWatchConfig, writeSampleConfig } from './transcripts/config.js';
+import { TranscriptWatcher } from './transcripts/watcher.js';

 // HTTP route handlers
 import { ViewerRoutes } from './worker/http/routes/ViewerRoutes.js';
@@ -179,6 +181,9 @@ export class WorkerService {
  // Chroma MCP manager (lazy - connects on first use)
  private chromaMcpManager: ChromaMcpManager | null = null;

+  // Transcript watcher for Codex and other transcript-based clients
+  private transcriptWatcher: TranscriptWatcher | null = null;
+
  // Initialization tracking
  private initializationComplete: Promise<void>;
  private resolveInitialization!: () => void;
@@ -421,6 +426,8 @@ export class WorkerService {
      this.resolveInitialization();
      logger.info('SYSTEM', 'Core initialization complete (DB + search ready)');

+      await this.startTranscriptWatcher(settings);
+
      // Auto-backfill Chroma for all projects if out of sync with SQLite (fire-and-forget)
      if (this.chromaMcpManager) {
        ChromaSync.backfillAllProjects().then(() => {
@@ -519,6 +526,48 @@ export class WorkerService {
    }
  }

+  /**
+   * Start transcript watcher for Codex and other transcript-based clients.
+   * This is intentionally non-fatal so Claude hooks remain usable even if
+   * transcript ingestion is misconfigured.
+   */
+  private async startTranscriptWatcher(settings: ReturnType<typeof SettingsDefaultsManager.loadFromFile>): Promise<void> {
+    const transcriptsEnabled = settings.CLAUDE_MEM_TRANSCRIPTS_ENABLED !== 'false';
+    if (!transcriptsEnabled) {
+      logger.info('TRANSCRIPT', 'Transcript watcher disabled via CLAUDE_MEM_TRANSCRIPTS_ENABLED=false');
+      return;
+    }
+
+    const configPath = settings.CLAUDE_MEM_TRANSCRIPTS_CONFIG_PATH || DEFAULT_CONFIG_PATH;
+    const resolvedConfigPath = expandHomePath(configPath);
+
+    try {
+      if (!existsSync(resolvedConfigPath)) {
+        writeSampleConfig(configPath);
+        logger.info('TRANSCRIPT', 'Created default transcript watch config', {
+          configPath: resolvedConfigPath
+        });
+      }
+
+      const transcriptConfig = loadTranscriptWatchConfig(configPath);
+      const statePath = expandHomePath(transcriptConfig.stateFile ?? DEFAULT_STATE_PATH);
+
+      this.transcriptWatcher = new TranscriptWatcher(transcriptConfig, statePath);
+      await this.transcriptWatcher.start();
+      logger.info('TRANSCRIPT', 'Transcript watcher started', {
+        configPath: resolvedConfigPath,
+        statePath,
+        watches: transcriptConfig.watches.length
+      });
+    } catch (error) {
+      this.transcriptWatcher?.stop();
+      this.transcriptWatcher = null;
+      logger.error('TRANSCRIPT', 'Failed to start transcript watcher (continuing without Codex ingestion)', {
+        configPath: resolvedConfigPath
+      }, error as Error);
+    }
+  }
+
  /**
   * Get the appropriate agent based on provider settings.
   * Same logic as SessionRoutes.getActiveAgent() for consistency.
@@ -903,6 +952,12 @@ export class WorkerService {
   * Shutdown the worker service
   */
  async shutdown(): Promise<void> {
+    if (this.transcriptWatcher) {
+      this.transcriptWatcher.stop();
+      this.transcriptWatcher = null;
+      logger.info('TRANSCRIPT', 'Transcript watcher stopped');
+    }
+
    // Stop orphan reaper before shutdown (Issue #737)
    if (this.stopOrphanReaper) {
      this.stopOrphanReaper();
@@ -957,7 +1012,7 @@ export class WorkerService {
 * @param port - The TCP port (used for port-in-use checks and daemon spawn)
 * @returns true if worker is healthy (existing or newly started), false on failure
 */
-async function ensureWorkerStarted(port: number): Promise<boolean> {
+export async function ensureWorkerStarted(port: number): Promise<boolean> {
  // Clean stale PID file first (cheap: 1 fs read + 1 signal-0 check)
  const pidFileStatus = cleanStalePidFile();
  if (pidFileStatus === 'alive') {
--- a/src/services/worker-types.ts
+++ b/src/services/worker-types.ts
@@ -22,6 +22,7 @@ export interface ActiveSession {
  contentSessionId: string;      // User's Claude Code session being observed
  memorySessionId: string | null; // Memory agent's session ID for resume
  project: string;
+  platformSource: string;
  userPrompt: string;
  pendingMessages: PendingMessage[];  // Deprecated: now using persistent store, kept for compatibility
  abortController: AbortController;
@@ -97,6 +98,7 @@ export interface PaginationParams {
  offset: number;
  limit: number;
  project?: string;
+  platformSource?: string;
 }

 // ============================================================================
@@ -117,6 +119,7 @@ export interface Observation {
  id: number;
  memory_session_id: string;  // Renamed from sdk_session_id
  project: string;
+  platform_source: string;
  type: string;
  title: string;
  subtitle: string | null;
@@ -135,6 +138,7 @@ export interface Summary {
  id: number;
  session_id: string; // content_session_id (from JOIN)
  project: string;
+  platform_source: string;
  request: string | null;
  investigated: string | null;
  learned: string | null;
@@ -149,6 +153,7 @@ export interface UserPrompt {
  id: number;
  content_session_id: string;  // Renamed from claude_session_id
  project: string; // From JOIN with sdk_sessions
+  platform_source: string;
  prompt_number: number;
  prompt_text: string;
  created_at: string;
@@ -159,6 +164,7 @@ export interface DBSession {
  id: number;
  content_session_id: string;    // Renamed from claude_session_id
  project: string;
+  platform_source: string;
  user_prompt: string;
  memory_session_id: string | null;  // Renamed from sdk_session_id
  status: 'active' | 'completed' | 'failed';
--- a/src/services/worker/PaginationHelper.ts
+++ b/src/services/worker/PaginationHelper.ts
@@ -71,14 +71,54 @@ export class PaginationHelper {
  /**
   * Get paginated observations
   */
-  getObservations(offset: number, limit: number, project?: string): PaginatedResult<Observation> {
-    const result = this.paginate<Observation>(
-      'observations',
-      'id, memory_session_id, project, type, title, subtitle, narrative, text, facts, concepts, files_read, files_modified, prompt_number, created_at, created_at_epoch',
+  getObservations(offset: number, limit: number, project?: string, platformSource?: string): PaginatedResult<Observation> {
+    const db = this.dbManager.getSessionStore().db;
+    let query = `
+      SELECT
+        o.id,
+        o.memory_session_id,
+        o.project,
+        COALESCE(s.platform_source, 'claude') as platform_source,
+        o.type,
+        o.title,
+        o.subtitle,
+        o.narrative,
+        o.text,
+        o.facts,
+        o.concepts,
+        o.files_read,
+        o.files_modified,
+        o.prompt_number,
+        o.created_at,
+        o.created_at_epoch
+      FROM observations o
+      LEFT JOIN sdk_sessions s ON o.memory_session_id = s.memory_session_id
+    `;
+    const params: unknown[] = [];
+    const conditions: string[] = [];
+
+    if (project) {
+      conditions.push('o.project = ?');
+      params.push(project);
+    }
+    if (platformSource) {
+      conditions.push(`COALESCE(s.platform_source, 'claude') = ?`);
+      params.push(platformSource);
+    }
+    if (conditions.length > 0) {
+      query += ` WHERE ${conditions.join(' AND ')}`;
+    }
+
+    query += ' ORDER BY o.created_at_epoch DESC LIMIT ? OFFSET ?';
+    params.push(limit + 1, offset);
+
+    const results = db.prepare(query).all(...params) as Observation[];
+    const result: PaginatedResult<Observation> = {
+      items: results.slice(0, limit),
+      hasMore: results.length > limit,
      offset,
-      limit,
-      project
-    );
+      limit
+    };

    // Strip project paths from file paths before returning
    return {
@@ -90,13 +130,14 @@ export class PaginationHelper {
  /**
   * Get paginated summaries
   */
-  getSummaries(offset: number, limit: number, project?: string): PaginatedResult<Summary> {
+  getSummaries(offset: number, limit: number, project?: string, platformSource?: string): PaginatedResult<Summary> {
    const db = this.dbManager.getSessionStore().db;

    let query = `
      SELECT
        ss.id,
        s.content_session_id as session_id,
+        COALESCE(s.platform_source, 'claude') as platform_source,
        ss.request,
        ss.investigated,
        ss.learned,
@@ -110,11 +151,22 @@ export class PaginationHelper {
    `;
    const params: any[] = [];

+    const conditions: string[] = [];
+
    if (project) {
-      query += ' WHERE ss.project = ?';
+      conditions.push('ss.project = ?');
      params.push(project);
    }

+    if (platformSource) {
+      conditions.push(`COALESCE(s.platform_source, 'claude') = ?`);
+      params.push(platformSource);
+    }
+
+    if (conditions.length > 0) {
+      query += ` WHERE ${conditions.join(' AND ')}`;
+    }
+
    query += ' ORDER BY ss.created_at_epoch DESC LIMIT ? OFFSET ?';
    params.push(limit + 1, offset);

@@ -132,21 +184,40 @@ export class PaginationHelper {
  /**
   * Get paginated user prompts
   */
-  getPrompts(offset: number, limit: number, project?: string): PaginatedResult<UserPrompt> {
+  getPrompts(offset: number, limit: number, project?: string, platformSource?: string): PaginatedResult<UserPrompt> {
    const db = this.dbManager.getSessionStore().db;

    let query = `
-      SELECT up.id, up.content_session_id, s.project, up.prompt_number, up.prompt_text, up.created_at, up.created_at_epoch
+      SELECT
+        up.id,
+        up.content_session_id,
+        s.project,
+        COALESCE(s.platform_source, 'claude') as platform_source,
+        up.prompt_number,
+        up.prompt_text,
+        up.created_at,
+        up.created_at_epoch
      FROM user_prompts up
      JOIN sdk_sessions s ON up.content_session_id = s.content_session_id
    `;
    const params: any[] = [];

+    const conditions: string[] = [];
+
    if (project) {
-      query += ' WHERE s.project = ?';
+      conditions.push('s.project = ?');
      params.push(project);
    }

+    if (platformSource) {
+      conditions.push(`COALESCE(s.platform_source, 'claude') = ?`);
+      params.push(platformSource);
+    }
+
+    if (conditions.length > 0) {
+      query += ` WHERE ${conditions.join(' AND ')}`;
+    }
+
    query += ' ORDER BY up.created_at_epoch DESC LIMIT ? OFFSET ?';
    params.push(limit + 1, offset);

--- a/src/services/worker/SessionManager.ts
+++ b/src/services/worker/SessionManager.ts
@@ -77,6 +77,9 @@ export class SessionManager {
        });
        session.project = dbSession.project;
      }
+      if (dbSession.platform_source && dbSession.platform_source !== session.platformSource) {
+        session.platformSource = dbSession.platform_source;
+      }

      // Update userPrompt for continuation prompts
      if (currentUserPrompt) {
@@ -144,6 +147,7 @@ export class SessionManager {
      contentSessionId: dbSession.content_session_id,
      memorySessionId: null,  // Always start fresh - SDK will capture new ID
      project: dbSession.project,
+      platformSource: dbSession.platform_source,
      userPrompt,
      pendingMessages: [],
      abortController: new AbortController(),
--- a/src/services/worker/agents/ResponseProcessor.ts
+++ b/src/services/worker/agents/ResponseProcessor.ts
@@ -223,6 +223,7 @@ async function syncAndBroadcastObservations(
      id: obsId,
      memory_session_id: session.memorySessionId,
      session_id: session.contentSessionId,
+      platform_source: session.platformSource,
      type: obs.type,
      title: obs.title,
      subtitle: obs.subtitle,
@@ -312,6 +313,7 @@ async function syncAndBroadcastSummary(
  broadcastSummary(worker, {
    id: result.summaryId,
    session_id: session.contentSessionId,
+    platform_source: session.platformSource,
    request: summary!.request,
    investigated: summary!.investigated,
    learned: summary!.learned,
--- a/src/services/worker/agents/types.ts
+++ b/src/services/worker/agents/types.ts
@@ -33,6 +33,7 @@ export interface ObservationSSEPayload {
  id: number;
  memory_session_id: string | null;
  session_id: string;
+  platform_source: string;
  type: string;
  title: string | null;
  subtitle: string | null;
@@ -50,6 +51,7 @@ export interface ObservationSSEPayload {
 export interface SummarySSEPayload {
  id: number;
  session_id: string;
+  platform_source: string;
  request: string | null;
  investigated: string | null;
  learned: string | null;
--- a/src/services/worker/events/SessionEventBroadcaster.ts
+++ b/src/services/worker/events/SessionEventBroadcaster.ts
@@ -23,6 +23,7 @@ export class SessionEventBroadcaster {
    id: number;
    content_session_id: string;
    project: string;
+    platform_source: string;
    prompt_number: number;
    prompt_text: string;
    created_at_epoch: number;
--- a/src/services/worker/http/BaseRouteHandler.ts
+++ b/src/services/worker/http/BaseRouteHandler.ts
@@ -11,6 +11,7 @@

 import { Request, Response } from 'express';
 import { logger } from '../../../utils/logger.js';
+import { AppError } from '../../server/ErrorHandler.js';

 export abstract class BaseRouteHandler {
  /**
@@ -80,7 +81,18 @@ export abstract class BaseRouteHandler {
  protected handleError(res: Response, error: Error, context?: string): void {
    logger.failure('WORKER', context || 'Request failed', {}, error);
    if (!res.headersSent) {
-      res.status(500).json({ error: error.message });
+      const statusCode = error instanceof AppError ? error.statusCode : 500;
+      const response: Record<string, unknown> = { error: error.message };
+
+      if (error instanceof AppError && error.code) {
+        response.code = error.code;
+      }
+
+      if (error instanceof AppError && error.details !== undefined) {
+        response.details = error.details;
+      }
+
+      res.status(statusCode).json(response);
    }
  }
 }
--- a/src/services/worker/http/routes/DataRoutes.ts
+++ b/src/services/worker/http/routes/DataRoutes.ts
@@ -66,8 +66,8 @@ export class DataRoutes extends BaseRouteHandler {
   * Get paginated observations
   */
  private handleGetObservations = this.wrapHandler((req: Request, res: Response): void => {
-    const { offset, limit, project } = this.parsePaginationParams(req);
-    const result = this.paginationHelper.getObservations(offset, limit, project);
+    const { offset, limit, project, platformSource } = this.parsePaginationParams(req);
+    const result = this.paginationHelper.getObservations(offset, limit, project, platformSource);
    res.json(result);
  });

@@ -75,8 +75,8 @@ export class DataRoutes extends BaseRouteHandler {
   * Get paginated summaries
   */
  private handleGetSummaries = this.wrapHandler((req: Request, res: Response): void => {
-    const { offset, limit, project } = this.parsePaginationParams(req);
-    const result = this.paginationHelper.getSummaries(offset, limit, project);
+    const { offset, limit, project, platformSource } = this.parsePaginationParams(req);
+    const result = this.paginationHelper.getSummaries(offset, limit, project, platformSource);
    res.json(result);
  });

@@ -84,8 +84,8 @@ export class DataRoutes extends BaseRouteHandler {
   * Get paginated user prompts
   */
  private handleGetPrompts = this.wrapHandler((req: Request, res: Response): void => {
-    const { offset, limit, project } = this.parsePaginationParams(req);
-    const result = this.paginationHelper.getPrompts(offset, limit, project);
+    const { offset, limit, project, platformSource } = this.parsePaginationParams(req);
+    const result = this.paginationHelper.getPrompts(offset, limit, project, platformSource);
    res.json(result);
  });

@@ -256,19 +256,19 @@ export class DataRoutes extends BaseRouteHandler {
   * GET /api/projects
   */
  private handleGetProjects = this.wrapHandler((req: Request, res: Response): void => {
-    const db = this.dbManager.getSessionStore().db;
+    const store = this.dbManager.getSessionStore();
+    const platformSource = req.query.platformSource as string | undefined;

-    const rows = db.prepare(`
-      SELECT DISTINCT project
-      FROM observations
-      WHERE project IS NOT NULL
-      GROUP BY project
-      ORDER BY MAX(created_at_epoch) DESC
-    `).all() as Array<{ project: string }>;
+    if (platformSource) {
+      res.json({
+        projects: store.getAllProjects(platformSource),
+        sources: [platformSource],
+        projectsBySource: { [platformSource]: store.getAllProjects(platformSource) }
+      });
+      return;
+    }

-    const projects = rows.map(row => row.project);
-
-    res.json({ projects });
+    res.json(store.getProjectCatalog());
  });

  /**
@@ -299,12 +299,13 @@ export class DataRoutes extends BaseRouteHandler {
  /**
   * Parse pagination parameters from request query
   */
-  private parsePaginationParams(req: Request): { offset: number; limit: number; project?: string } {
+  private parsePaginationParams(req: Request): { offset: number; limit: number; project?: string; platformSource?: string } {
    const offset = parseInt(req.query.offset as string, 10) || 0;
    const limit = Math.min(parseInt(req.query.limit as string, 10) || 20, 100); // Max 100
    const project = req.query.project as string | undefined;
+    const platformSource = req.query.platformSource as string | undefined;

-    return { offset, limit, project };
+    return { offset, limit, project, platformSource };
  }

  /**
--- a/src/services/worker/http/routes/SearchRoutes.ts
+++ b/src/services/worker/http/routes/SearchRoutes.ts
@@ -167,6 +167,7 @@ export class SearchRoutes extends BaseRouteHandler {
   */
  private handleContextPreview = this.wrapHandler(async (req: Request, res: Response): Promise<void> => {
    const projectName = req.query.project as string;
+    const platformSource = req.query.platformSource as string | undefined;

    if (!projectName) {
      this.badRequest(res, 'Project parameter is required');
@@ -183,7 +184,9 @@ export class SearchRoutes extends BaseRouteHandler {
    const contextText = await generateContext(
      {
        session_id: 'preview-' + Date.now(),
-        cwd: cwd
+        cwd: cwd,
+        projects: [projectName],
+        platform_source: platformSource
      },
      true  // useColors=true for ANSI terminal output
    );
@@ -209,6 +212,7 @@ export class SearchRoutes extends BaseRouteHandler {
    const projectsParam = (req.query.projects as string) || (req.query.project as string);
    const useColors = req.query.colors === 'true';
    const full = req.query.full === 'true';
+    const platformSource = req.query.platformSource as string | undefined;

    if (!projectsParam) {
      this.badRequest(res, 'Project(s) parameter is required');
@@ -236,7 +240,8 @@ export class SearchRoutes extends BaseRouteHandler {
        session_id: 'context-inject-' + Date.now(),
        cwd: cwd,
        projects: projects,
-        full
+        full,
+        platform_source: platformSource
      },
      useColors
    );
--- a/src/services/worker/http/routes/SessionRoutes.ts
+++ b/src/services/worker/http/routes/SessionRoutes.ts
@@ -22,6 +22,8 @@ import { PrivacyCheckValidator } from '../../validation/PrivacyCheckValidator.js
 import { SettingsDefaultsManager } from '../../../../shared/SettingsDefaultsManager.js';
 import { USER_SETTINGS_PATH } from '../../../../shared/paths.js';
 import { getProcessBySession, ensureProcessExit } from '../../ProcessRegistry.js';
+import { getProjectName } from '../../../../utils/project-name.js';
+import { normalizePlatformSource } from '../../../../shared/platform-source.js';

 export class SessionRoutes extends BaseRouteHandler {
  private completionHandler: SessionCompletionHandler;
@@ -348,6 +350,7 @@ export class SessionRoutes extends BaseRouteHandler {
        id: latestPrompt.id,
        content_session_id: latestPrompt.content_session_id,
        project: latestPrompt.project,
+        platform_source: latestPrompt.platform_source,
        prompt_number: latestPrompt.prompt_number,
        prompt_text: latestPrompt.prompt_text,
        created_at_epoch: latestPrompt.created_at_epoch
@@ -497,6 +500,8 @@ export class SessionRoutes extends BaseRouteHandler {
   */
  private handleObservationsByClaudeId = this.wrapHandler((req: Request, res: Response): void => {
    const { contentSessionId, tool_name, tool_input, tool_response, cwd } = req.body;
+    const platformSource = normalizePlatformSource(req.body.platformSource);
+    const project = typeof cwd === 'string' && cwd.trim() ? getProjectName(cwd) : '';

    if (!contentSessionId) {
      return this.badRequest(res, 'Missing contentSessionId');
@@ -531,7 +536,7 @@ export class SessionRoutes extends BaseRouteHandler {
      const store = this.dbManager.getSessionStore();

      // Get or create session
-      const sessionDbId = store.createSDKSession(contentSessionId, '', '');
+      const sessionDbId = store.createSDKSession(contentSessionId, project, '', undefined, platformSource);
      const promptNumber = store.getPromptNumberFromUserPrompts(contentSessionId);

      // Privacy check: skip if user prompt was entirely private
@@ -595,6 +600,7 @@ export class SessionRoutes extends BaseRouteHandler {
   */
  private handleSummarizeByClaudeId = this.wrapHandler((req: Request, res: Response): void => {
    const { contentSessionId, last_assistant_message } = req.body;
+    const platformSource = normalizePlatformSource(req.body.platformSource);

    if (!contentSessionId) {
      return this.badRequest(res, 'Missing contentSessionId');
@@ -603,7 +609,7 @@ export class SessionRoutes extends BaseRouteHandler {
    const store = this.dbManager.getSessionStore();

    // Get or create session
-    const sessionDbId = store.createSDKSession(contentSessionId, '', '');
+    const sessionDbId = store.createSDKSession(contentSessionId, '', '', undefined, platformSource);
    const promptNumber = store.getPromptNumberFromUserPrompts(contentSessionId);

    // Privacy check: skip if user prompt was entirely private
@@ -643,6 +649,7 @@ export class SessionRoutes extends BaseRouteHandler {
   */
  private handleCompleteByClaudeId = this.wrapHandler(async (req: Request, res: Response): Promise<void> => {
    const { contentSessionId } = req.body;
+    const platformSource = normalizePlatformSource(req.body.platformSource);

    logger.info('HTTP', '→ POST /api/sessions/complete', { contentSessionId });

@@ -654,7 +661,7 @@ export class SessionRoutes extends BaseRouteHandler {

    // Look up sessionDbId from contentSessionId (createSDKSession is idempotent)
    // Pass empty strings - we only need the ID lookup, not to create a new session
-    const sessionDbId = store.createSDKSession(contentSessionId, '', '');
+    const sessionDbId = store.createSDKSession(contentSessionId, '', '', undefined, platformSource);

    // Check if session is in the active sessions map
    const activeSession = this.sessionManager.getSession(sessionDbId);
@@ -698,11 +705,13 @@ export class SessionRoutes extends BaseRouteHandler {
    // may omit prompt/project in their payload (#838, #1049)
    const project = req.body.project || 'unknown';
    const prompt = req.body.prompt || '[media prompt]';
+    const platformSource = req.body.platformSource || 'claude';
    const customTitle = req.body.customTitle || undefined;

    logger.info('HTTP', 'SessionRoutes: handleSessionInitByClaudeId called', {
      contentSessionId,
      project,
+      platformSource,
      prompt_length: prompt?.length,
      customTitle
    });
@@ -715,7 +724,7 @@ export class SessionRoutes extends BaseRouteHandler {
    const store = this.dbManager.getSessionStore();

    // Step 1: Create/get SDK session (idempotent INSERT OR IGNORE)
-    const sessionDbId = store.createSDKSession(contentSessionId, project, prompt, customTitle);
+    const sessionDbId = store.createSDKSession(contentSessionId, project, prompt, customTitle, platformSource);

    // Verify session creation with DB lookup
    const dbSession = store.getSessionById(sessionDbId);
--- a/src/services/worker/http/routes/ViewerRoutes.ts
+++ b/src/services/worker/http/routes/ViewerRoutes.ts
@@ -76,11 +76,13 @@ export class ViewerRoutes extends BaseRouteHandler {
    // Add client to broadcaster
    this.sseBroadcaster.addClient(res);

-    // Send initial_load event with projects list
-    const allProjects = this.dbManager.getSessionStore().getAllProjects();
+    // Send initial_load event with project/source catalog
+    const projectCatalog = this.dbManager.getSessionStore().getProjectCatalog();
    this.sseBroadcaster.broadcast({
      type: 'initial_load',
-      projects: allProjects,
+      projects: projectCatalog.projects,
+      sources: projectCatalog.sources,
+      projectsBySource: projectCatalog.projectsBySource,
      timestamp: Date.now()
    });

--- a/src/shared/SettingsDefaultsManager.ts
+++ b/src/shared/SettingsDefaultsManager.ts
@@ -49,6 +49,8 @@ export interface SettingsDefaults {
  CLAUDE_MEM_CONTEXT_SHOW_LAST_MESSAGE: string;
  CLAUDE_MEM_CONTEXT_SHOW_TERMINAL_OUTPUT: string;
  CLAUDE_MEM_FOLDER_CLAUDEMD_ENABLED: string;
+  CLAUDE_MEM_TRANSCRIPTS_ENABLED: string;  // 'true' | 'false' - enable transcript watcher ingestion for Codex and other transcript-based clients
+  CLAUDE_MEM_TRANSCRIPTS_CONFIG_PATH: string;  // Path to transcript watcher config JSON
  // Process Management
  CLAUDE_MEM_MAX_CONCURRENT_AGENTS: string;  // Max concurrent Claude SDK agent subprocesses (default: 2)
  // Exclusion Settings
@@ -108,6 +110,8 @@ export class SettingsDefaultsManager {
    CLAUDE_MEM_CONTEXT_SHOW_LAST_MESSAGE: 'false',
    CLAUDE_MEM_CONTEXT_SHOW_TERMINAL_OUTPUT: 'true',
    CLAUDE_MEM_FOLDER_CLAUDEMD_ENABLED: 'false',
+    CLAUDE_MEM_TRANSCRIPTS_ENABLED: 'true',
+    CLAUDE_MEM_TRANSCRIPTS_CONFIG_PATH: join(homedir(), '.claude-mem', 'transcript-watch.json'),
    // Process Management
    CLAUDE_MEM_MAX_CONCURRENT_AGENTS: '2',  // Max concurrent Claude SDK agent subprocesses
    // Exclusion Settings
--- a/src/shared/platform-source.ts
+++ b/src/shared/platform-source.ts
@@ -0,0 +1,36 @@
+export const DEFAULT_PLATFORM_SOURCE = 'claude';
+
+function sanitizeRawSource(value: string): string {
+  return value.trim().toLowerCase().replace(/\s+/g, '-');
+}
+
+export function normalizePlatformSource(value?: string | null): string {
+  if (!value) return DEFAULT_PLATFORM_SOURCE;
+
+  const source = sanitizeRawSource(value);
+  if (!source) return DEFAULT_PLATFORM_SOURCE;
+
+  if (source === 'transcript') return 'codex';
+  if (source.includes('codex')) return 'codex';
+  if (source.includes('cursor')) return 'cursor';
+  if (source.includes('claude')) return 'claude';
+
+  return source;
+}
+
+export function sortPlatformSources(sources: string[]): string[] {
+  const priority = ['claude', 'codex', 'cursor'];
+
+  return [...sources].sort((a, b) => {
+    const aPriority = priority.indexOf(a);
+    const bPriority = priority.indexOf(b);
+
+    if (aPriority !== -1 || bPriority !== -1) {
+      if (aPriority === -1) return 1;
+      if (bPriority === -1) return -1;
+      return aPriority - bPriority;
+    }
+
+    return a.localeCompare(b);
+  });
+}
--- a/src/types/database.ts
+++ b/src/types/database.ts
@@ -103,6 +103,7 @@ export interface UserPromptRecord {
  prompt_number: number;
  prompt_text: string;
  project?: string;  // From JOIN with sdk_sessions
+  platform_source?: string;
  created_at: string;
  created_at_epoch: number;
 }
@@ -115,6 +116,7 @@ export interface LatestPromptResult {
  content_session_id: string;
  memory_session_id: string;
  project: string;
+  platform_source: string;
  prompt_number: number;
  prompt_text: string;
  created_at_epoch: number;
--- a/src/ui/viewer-template.html
+++ b/src/ui/viewer-template.html
@@ -355,6 +355,14 @@
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.03);
    }

+    .header-main {
+      display: flex;
+      align-items: center;
+      gap: 18px;
+      min-width: 0;
+      flex-wrap: wrap;
+    }
+
    .sidebar-header {
      padding: 14px 18px;
      border-bottom: 1px solid var(--color-border-primary);
@@ -549,6 +557,42 @@
      font-size: 13px;
    }

+    .source-tabs {
+      display: inline-flex;
+      align-items: center;
+      gap: 6px;
+      flex-wrap: wrap;
+    }
+
+    .source-tab {
+      background: transparent;
+      border: 1px solid var(--color-border-primary);
+      color: var(--color-text-secondary);
+      border-radius: 999px;
+      padding: 6px 12px;
+      font-size: 12px;
+      line-height: 1;
+      font-weight: 600;
+      letter-spacing: 0.01em;
+      cursor: pointer;
+      transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
+      white-space: nowrap;
+    }
+
+    .source-tab:hover {
+      background: var(--color-bg-card-hover);
+      border-color: var(--color-border-focus);
+      color: var(--color-text-primary);
+      transform: translateY(-1px);
+    }
+
+    .source-tab.active {
+      background: linear-gradient(135deg, var(--color-bg-button) 0%, var(--color-accent-primary) 100%);
+      border-color: var(--color-bg-button);
+      color: var(--color-text-button);
+      box-shadow: 0 2px 8px rgba(9, 105, 218, 0.18);
+    }
+
    .settings-btn,
    .theme-toggle-btn {
      background: var(--color-bg-card);
@@ -887,6 +931,49 @@
      letter-spacing: 0.5px;
    }

+    .card-source {
+      padding: 2px 8px;
+      border-radius: 999px;
+      font-weight: 600;
+      font-size: 10px;
+      letter-spacing: 0.04em;
+      text-transform: uppercase;
+      border: 1px solid transparent;
+    }
+
+    .source-claude {
+      background: rgba(255, 138, 61, 0.12);
+      color: #c25a00;
+      border-color: rgba(255, 138, 61, 0.22);
+    }
+
+    .source-codex {
+      background: rgba(33, 150, 243, 0.12);
+      color: #0f5ba7;
+      border-color: rgba(33, 150, 243, 0.24);
+    }
+
+    .source-cursor {
+      background: rgba(124, 58, 237, 0.12);
+      color: #6d28d9;
+      border-color: rgba(124, 58, 237, 0.24);
+    }
+
+    [data-theme="dark"] .source-claude {
+      color: #ffb067;
+      border-color: rgba(255, 176, 103, 0.2);
+    }
+
+    [data-theme="dark"] .source-codex {
+      color: #8fc7ff;
+      border-color: rgba(143, 199, 255, 0.2);
+    }
+
+    [data-theme="dark"] .source-cursor {
+      color: #c4b5fd;
+      border-color: rgba(196, 181, 253, 0.2);
+    }
+
    .card-title {
      font-size: 17px;
      margin-bottom: 14px;
@@ -1483,6 +1570,10 @@
        padding: 14px 20px;
      }

+      .header-main {
+        gap: 12px;
+      }
+
      .status {
        gap: 6px;
      }
@@ -1491,6 +1582,11 @@
        max-width: 160px;
      }

+      .source-tab {
+        padding: 6px 10px;
+        font-size: 11px;
+      }
+
      /* Hide icon links (docs, github, twitter) on tablet */
      .icon-link {
        display: none;
@@ -1544,6 +1640,27 @@
        gap: 8px;
      }

+      .header-main {
+        gap: 10px;
+      }
+
+      .source-tabs {
+        width: 100%;
+        overflow-x: auto;
+        padding-bottom: 2px;
+        scrollbar-width: none;
+      }
+
+      .source-tabs::-webkit-scrollbar {
+        display: none;
+      }
+
+      .source-tab {
+        flex-shrink: 0;
+        padding: 5px 10px;
+        font-size: 11px;
+      }
+
      .logomark {
        height: 28px;
      }
@@ -1732,6 +1849,11 @@
      white-space: nowrap;
    }

+    .preview-selector select:disabled {
+      opacity: 0.6;
+      cursor: not-allowed;
+    }
+
    .preview-selector select {
      background: var(--color-bg-card);
      border: 1px solid var(--color-border-primary);
@@ -2873,4 +2995,4 @@
  <script src="viewer-bundle.js"></script>
 </body>

-</html>
+</html>
--- a/src/ui/viewer/App.tsx
+++ b/src/ui/viewer/App.tsx
@@ -13,39 +13,57 @@ import { mergeAndDeduplicateByProject } from './utils/data';

 export function App() {
  const [currentFilter, setCurrentFilter] = useState('');
+  const [currentSource, setCurrentSource] = useState('all');
  const [contextPreviewOpen, setContextPreviewOpen] = useState(false);
  const [logsModalOpen, setLogsModalOpen] = useState(false);
  const [paginatedObservations, setPaginatedObservations] = useState<Observation[]>([]);
  const [paginatedSummaries, setPaginatedSummaries] = useState<Summary[]>([]);
  const [paginatedPrompts, setPaginatedPrompts] = useState<UserPrompt[]>([]);

-  const { observations, summaries, prompts, projects, isProcessing, queueDepth, isConnected } = useSSE();
+  const { observations, summaries, prompts, projects, sources, projectsBySource, isProcessing, queueDepth, isConnected } = useSSE();
  const { settings, saveSettings, isSaving, saveStatus } = useSettings();
  const { stats, refreshStats } = useStats();
  const { preference, resolvedTheme, setThemePreference } = useTheme();
-  const pagination = usePagination(currentFilter);
+  const pagination = usePagination(currentFilter, currentSource);
+
+  const availableProjects = useMemo(() => {
+    if (currentSource === 'all') {
+      return projects;
+    }
+
+    return projectsBySource[currentSource] || [];
+  }, [currentSource, projects, projectsBySource]);
+
+  const matchesSelection = useCallback((item: { project: string; platform_source: string }) => {
+    const matchesProject = !currentFilter || item.project === currentFilter;
+    const matchesSource = currentSource === 'all' || (item.platform_source || 'claude') === currentSource;
+    return matchesProject && matchesSource;
+  }, [currentFilter, currentSource]);
+
+  useEffect(() => {
+    if (currentFilter && !availableProjects.includes(currentFilter)) {
+      setCurrentFilter('');
+    }
+  }, [availableProjects, currentFilter]);

  // Merge SSE live data with paginated data, filtering by project when active
  const allObservations = useMemo(() => {
-    const live = currentFilter
-      ? observations.filter(o => o.project === currentFilter)
-      : observations;
-    return mergeAndDeduplicateByProject(live, paginatedObservations);
-  }, [observations, paginatedObservations, currentFilter]);
+    const live = observations.filter(matchesSelection);
+    const paginated = paginatedObservations.filter(matchesSelection);
+    return mergeAndDeduplicateByProject(live, paginated);
+  }, [observations, paginatedObservations, matchesSelection]);

  const allSummaries = useMemo(() => {
-    const live = currentFilter
-      ? summaries.filter(s => s.project === currentFilter)
-      : summaries;
-    return mergeAndDeduplicateByProject(live, paginatedSummaries);
-  }, [summaries, paginatedSummaries, currentFilter]);
+    const live = summaries.filter(matchesSelection);
+    const paginated = paginatedSummaries.filter(matchesSelection);
+    return mergeAndDeduplicateByProject(live, paginated);
+  }, [summaries, paginatedSummaries, matchesSelection]);

  const allPrompts = useMemo(() => {
-    const live = currentFilter
-      ? prompts.filter(p => p.project === currentFilter)
-      : prompts;
-    return mergeAndDeduplicateByProject(live, paginatedPrompts);
-  }, [prompts, paginatedPrompts, currentFilter]);
+    const live = prompts.filter(matchesSelection);
+    const paginated = paginatedPrompts.filter(matchesSelection);
+    return mergeAndDeduplicateByProject(live, paginated);
+  }, [prompts, paginatedPrompts, matchesSelection]);

  // Toggle context preview modal
  const toggleContextPreview = useCallback(() => {
@@ -78,24 +96,27 @@ export function App() {
    } catch (error) {
      console.error('Failed to load more data:', error);
    }
-  }, [currentFilter, pagination.observations, pagination.summaries, pagination.prompts]);
+  }, [pagination.observations, pagination.summaries, pagination.prompts]);

-  // Reset paginated data and load first page when filter changes
+  // Reset paginated data and load first page when project/source changes
  useEffect(() => {
    setPaginatedObservations([]);
    setPaginatedSummaries([]);
    setPaginatedPrompts([]);
    handleLoadMore();
    // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, [currentFilter]);
+  }, [currentFilter, currentSource]);

  return (
    <>
      <Header
        isConnected={isConnected}
-        projects={projects}
+        projects={availableProjects}
+        sources={sources}
        currentFilter={currentFilter}
+        currentSource={currentSource}
        onFilterChange={setCurrentFilter}
+        onSourceChange={setCurrentSource}
        isProcessing={isProcessing}
        queueDepth={queueDepth}
        themePreference={preference}
--- a/src/ui/viewer/components/ContextSettingsModal.tsx
+++ b/src/ui/viewer/components/ContextSettingsModal.tsx
@@ -136,7 +136,17 @@ export function ContextSettingsModal({
  }, [settings]);

  // Get context preview based on current form state
-  const { preview, isLoading, error, projects, selectedProject, setSelectedProject } = useContextPreview(formState);
+  const {
+    preview,
+    isLoading,
+    error,
+    projects,
+    sources,
+    selectedSource,
+    setSelectedSource,
+    selectedProject,
+    setSelectedProject
+  } = useContextPreview(formState);

  const updateSetting = useCallback((key: keyof Settings, value: string) => {
    const newState = { ...formState, [key]: value };
@@ -174,10 +184,23 @@ export function ContextSettingsModal({
          <h2>Settings</h2>
          <div className="header-controls">
            <label className="preview-selector">
-              Preview for:
+              Source:
+              <select
+                value={selectedSource || ''}
+                onChange={(e) => setSelectedSource(e.target.value)}
+                disabled={sources.length === 0}
+              >
+                {sources.map(source => (
+                  <option key={source} value={source}>{source}</option>
+                ))}
+              </select>
+            </label>
+            <label className="preview-selector">
+              Project:
              <select
                value={selectedProject || ''}
                onChange={(e) => setSelectedProject(e.target.value)}
+                disabled={projects.length === 0}
              >
                {projects.map(project => (
                  <option key={project} value={project}>{project}</option>
--- a/src/ui/viewer/components/Header.tsx
+++ b/src/ui/viewer/components/Header.tsx
@@ -7,8 +7,11 @@ import { useSpinningFavicon } from '../hooks/useSpinningFavicon';
 interface HeaderProps {
  isConnected: boolean;
  projects: string[];
+  sources: string[];
  currentFilter: string;
+  currentSource: string;
  onFilterChange: (filter: string) => void;
+  onSourceChange: (source: string) => void;
  isProcessing: boolean;
  queueDepth: number;
  themePreference: ThemePreference;
@@ -16,11 +19,26 @@ interface HeaderProps {
  onContextPreviewToggle: () => void;
 }

+function formatSourceLabel(source: string): string {
+  if (source === 'all') return 'All';
+  if (source === 'claude') return 'Claude';
+  if (source === 'codex') return 'Codex';
+  return source.charAt(0).toUpperCase() + source.slice(1);
+}
+
+function buildSourceTabs(sources: string[]): string[] {
+  const merged = ['all', 'claude', 'codex', ...sources];
+  return Array.from(new Set(merged.filter(Boolean)));
+}
+
 export function Header({
  isConnected,
  projects,
+  sources,
  currentFilter,
+  currentSource,
  onFilterChange,
+  onSourceChange,
  isProcessing,
  queueDepth,
  themePreference,
@@ -28,20 +46,36 @@ export function Header({
  onContextPreviewToggle
 }: HeaderProps) {
  useSpinningFavicon(isProcessing);
+  const availableSources = buildSourceTabs(sources);

  return (
    <div className="header">
-      <h1>
-        <div style={{ position: 'relative', display: 'inline-block' }}>
-          <img src="claude-mem-logomark.webp" alt="" className={`logomark ${isProcessing ? 'spinning' : ''}`} />
-          {queueDepth > 0 && (
-            <div className="queue-bubble">
-              {queueDepth}
-            </div>
-          )}
+      <div className="header-main">
+        <h1>
+          <div style={{ position: 'relative', display: 'inline-block' }}>
+            <img src="claude-mem-logomark.webp" alt="" className={`logomark ${isProcessing ? 'spinning' : ''}`} />
+            {queueDepth > 0 && (
+              <div className="queue-bubble">
+                {queueDepth}
+              </div>
+            )}
+          </div>
+          <span className="logo-text">claude-mem</span>
+        </h1>
+        <div className="source-tabs" role="tablist" aria-label="Context source tabs">
+          {availableSources.map(source => (
+            <button
+              key={source}
+              type="button"
+              className={`source-tab ${currentSource === source ? 'active' : ''}`}
+              onClick={() => onSourceChange(source)}
+              aria-pressed={currentSource === source}
+            >
+              {formatSourceLabel(source)}
+            </button>
+          ))}
        </div>
-        <span className="logo-text">claude-mem</span>
-      </h1>
+      </div>
      <div className="status">
        <a
          href="https://docs.claude-mem.ai"
--- a/src/ui/viewer/components/ObservationCard.tsx
+++ b/src/ui/viewer/components/ObservationCard.tsx
@@ -52,6 +52,9 @@ export function ObservationCard({ observation }: ObservationCardProps) {
          <span className={`card-type type-${observation.type}`}>
            {observation.type}
          </span>
+          <span className={`card-source source-${observation.platform_source || 'claude'}`}>
+            {observation.platform_source || 'claude'}
+          </span>
          <span className="card-project">{observation.project}</span>
        </div>
        <div className="view-mode-toggles">
--- a/src/ui/viewer/components/PromptCard.tsx
+++ b/src/ui/viewer/components/PromptCard.tsx
@@ -14,6 +14,9 @@ export function PromptCard({ prompt }: PromptCardProps) {
      <div className="card-header">
        <div className="card-header-left">
          <span className="card-type">Prompt</span>
+          <span className={`card-source source-${prompt.platform_source || 'claude'}`}>
+            {prompt.platform_source || 'claude'}
+          </span>
          <span className="card-project">{prompt.project}</span>
        </div>
      </div>
--- a/src/ui/viewer/components/SummaryCard.tsx
+++ b/src/ui/viewer/components/SummaryCard.tsx
@@ -21,6 +21,9 @@ export function SummaryCard({ summary }: SummaryCardProps) {
      <header className="summary-card-header">
        <div className="summary-badge-row">
          <span className="card-type summary-badge">Session Summary</span>
+          <span className={`card-source source-${summary.platform_source || 'claude'}`}>
+            {summary.platform_source || 'claude'}
+          </span>
          <span className="summary-project-badge">{summary.project}</span>
        </div>
        {summary.request && (
--- a/src/ui/viewer/hooks/useContextPreview.ts
+++ b/src/ui/viewer/hooks/useContextPreview.ts
@@ -1,5 +1,5 @@
 import { useState, useEffect, useCallback } from 'react';
-import type { Settings } from '../types';
+import type { ProjectCatalog, Settings } from '../types';

 interface UseContextPreviewResult {
  preview: string;
@@ -7,15 +7,31 @@ interface UseContextPreviewResult {
  error: string | null;
  refresh: () => Promise<void>;
  projects: string[];
+  sources: string[];
+  selectedSource: string | null;
+  setSelectedSource: (source: string) => void;
  selectedProject: string | null;
  setSelectedProject: (project: string) => void;
 }

+function getPreferredSource(sources: string[]): string | null {
+  if (sources.includes('claude')) return 'claude';
+  if (sources.includes('codex')) return 'codex';
+  return sources[0] || null;
+}
+
+function withDefaultSources(sources: string[]): string[] {
+  const merged = ['claude', 'codex', ...sources];
+  return Array.from(new Set(merged));
+}
+
 export function useContextPreview(settings: Settings): UseContextPreviewResult {
  const [preview, setPreview] = useState<string>('');
  const [isLoading, setIsLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);
+  const [catalog, setCatalog] = useState<ProjectCatalog>({ projects: [], sources: [], projectsBySource: {} });
  const [projects, setProjects] = useState<string[]>([]);
+  const [selectedSource, setSelectedSource] = useState<string | null>(null);
  const [selectedProject, setSelectedProject] = useState<string | null>(null);

  // Fetch projects on mount
@@ -23,11 +39,27 @@ export function useContextPreview(settings: Settings): UseContextPreviewResult {
    async function fetchProjects() {
      try {
        const response = await fetch('/api/projects');
-        const data = await response.json();
-        if (data.projects && data.projects.length > 0) {
-          setProjects(data.projects);
-          setSelectedProject(data.projects[0]); // Default to first project
+        const data = await response.json() as ProjectCatalog;
+        const nextCatalog: ProjectCatalog = {
+          projects: data.projects || [],
+          sources: withDefaultSources(data.sources || []),
+          projectsBySource: data.projectsBySource || {}
+        };
+
+        setCatalog(nextCatalog);
+
+        const preferredSource = getPreferredSource(nextCatalog.sources);
+        setSelectedSource(preferredSource);
+
+        if (preferredSource) {
+          const sourceProjects = nextCatalog.projectsBySource[preferredSource] || [];
+          setProjects(sourceProjects);
+          setSelectedProject(sourceProjects[0] || null);
+          return;
        }
+
+        setProjects(nextCatalog.projects);
+        setSelectedProject(nextCatalog.projects[0] || null);
      } catch (err) {
        console.error('Failed to fetch projects:', err);
      }
@@ -35,6 +67,18 @@ export function useContextPreview(settings: Settings): UseContextPreviewResult {
    fetchProjects();
  }, []);

+  useEffect(() => {
+    if (!selectedSource) {
+      setProjects(catalog.projects);
+      setSelectedProject(prev => (prev && catalog.projects.includes(prev) ? prev : catalog.projects[0] || null));
+      return;
+    }
+
+    const sourceProjects = catalog.projectsBySource[selectedSource] || [];
+    setProjects(sourceProjects);
+    setSelectedProject(prev => (prev && sourceProjects.includes(prev) ? prev : sourceProjects[0] || null));
+  }, [catalog, selectedSource]);
+
  const refresh = useCallback(async () => {
    if (!selectedProject) {
      setPreview('No project selected');
@@ -48,6 +92,10 @@ export function useContextPreview(settings: Settings): UseContextPreviewResult {
      project: selectedProject
    });

+    if (selectedSource) {
+      params.append('platformSource', selectedSource);
+    }
+
    const response = await fetch(`/api/context/preview?${params}`);
    const text = await response.text();

@@ -58,7 +106,7 @@ export function useContextPreview(settings: Settings): UseContextPreviewResult {
    }

    setIsLoading(false);
-  }, [selectedProject]);
+  }, [selectedProject, selectedSource]);

  // Debounced refresh when settings or selectedProject change
  useEffect(() => {
@@ -68,5 +116,16 @@ export function useContextPreview(settings: Settings): UseContextPreviewResult {
    return () => clearTimeout(timeout);
  }, [settings, refresh]);

-  return { preview, isLoading, error, refresh, projects, selectedProject, setSelectedProject };
+  return {
+    preview,
+    isLoading,
+    error,
+    refresh,
+    projects,
+    sources: catalog.sources,
+    selectedSource,
+    setSelectedSource,
+    selectedProject,
+    setSelectedProject
+  };
 }
--- a/src/ui/viewer/hooks/usePagination.ts
+++ b/src/ui/viewer/hooks/usePagination.ts
@@ -14,7 +14,7 @@ type DataItem = Observation | Summary | UserPrompt;
 /**
 * Generic pagination hook for observations, summaries, and prompts
 */
-function usePaginationFor(endpoint: string, dataType: DataType, currentFilter: string) {
+function usePaginationFor(endpoint: string, dataType: DataType, currentFilter: string, currentSource: string) {
  const [state, setState] = useState<PaginationState>({
    isLoading: false,
    hasMore: true
@@ -22,7 +22,7 @@ function usePaginationFor(endpoint: string, dataType: DataType, currentFilter: s

  // Track offset and filter in refs to handle synchronous resets
  const offsetRef = useRef(0);
-  const lastFilterRef = useRef(currentFilter);
+  const lastSelectionRef = useRef(`${currentSource}::${currentFilter}`);
  const stateRef = useRef(state);

  /**
@@ -31,16 +31,17 @@ function usePaginationFor(endpoint: string, dataType: DataType, currentFilter: s
   */
  const loadMore = useCallback(async (): Promise<DataItem[]> => {
    // Check if filter changed - if so, reset pagination synchronously
-    const filterChanged = lastFilterRef.current !== currentFilter;
+    const selectionKey = `${currentSource}::${currentFilter}`;
+    const filterChanged = lastSelectionRef.current !== selectionKey;

    if (filterChanged) {
      offsetRef.current = 0;
-      lastFilterRef.current = currentFilter;
+      lastSelectionRef.current = selectionKey;

      // Reset state both in React state and ref synchronously
      const newState = { isLoading: false, hasMore: true };
      setState(newState);
-      stateRef.current = newState;  // Update ref immediately to avoid stale checks
+      stateRef.current = newState; // Update ref immediately to avoid stale checks
    }

    // Prevent concurrent requests using ref (always current)
@@ -49,6 +50,7 @@ function usePaginationFor(endpoint: string, dataType: DataType, currentFilter: s
      return [];
    }

+    stateRef.current = { ...stateRef.current, isLoading: true };
    setState(prev => ({ ...prev, isLoading: true }));

    // Build query params using current offset from ref
@@ -62,6 +64,10 @@ function usePaginationFor(endpoint: string, dataType: DataType, currentFilter: s
      params.append('project', currentFilter);
    }

+    if (currentSource && currentSource !== 'all') {
+      params.append('platformSource', currentSource);
+    }
+
    const response = await fetch(`${endpoint}?${params}`);

    if (!response.ok) {
@@ -70,6 +76,13 @@ function usePaginationFor(endpoint: string, dataType: DataType, currentFilter: s

    const data = await response.json() as { items: DataItem[], hasMore: boolean };

+    const nextState = {
+      ...stateRef.current,
+      isLoading: false,
+      hasMore: data.hasMore
+    };
+    stateRef.current = nextState;
+
    setState(prev => ({
      ...prev,
      isLoading: false,
@@ -80,7 +93,7 @@ function usePaginationFor(endpoint: string, dataType: DataType, currentFilter: s
    offsetRef.current += UI.PAGINATION_PAGE_SIZE;

    return data.items;
-  }, [currentFilter, endpoint, dataType]);
+  }, [currentFilter, currentSource, endpoint, dataType]);

  return {
    ...state,
@@ -91,10 +104,10 @@ function usePaginationFor(endpoint: string, dataType: DataType, currentFilter: s
 /**
 * Hook for paginating observations
 */
-export function usePagination(currentFilter: string) {
-  const observations = usePaginationFor(API_ENDPOINTS.OBSERVATIONS, 'observations', currentFilter);
-  const summaries = usePaginationFor(API_ENDPOINTS.SUMMARIES, 'summaries', currentFilter);
-  const prompts = usePaginationFor(API_ENDPOINTS.PROMPTS, 'prompts', currentFilter);
+export function usePagination(currentFilter: string, currentSource: string) {
+  const observations = usePaginationFor(API_ENDPOINTS.OBSERVATIONS, 'observations', currentFilter, currentSource);
+  const summaries = usePaginationFor(API_ENDPOINTS.SUMMARIES, 'summaries', currentFilter, currentSource);
+  const prompts = usePaginationFor(API_ENDPOINTS.PROMPTS, 'prompts', currentFilter, currentSource);

  return {
    observations,
--- a/src/ui/viewer/hooks/useSSE.ts
+++ b/src/ui/viewer/hooks/useSSE.ts
@@ -1,5 +1,5 @@
 import { useState, useEffect, useRef } from 'react';
-import { Observation, Summary, UserPrompt, StreamEvent } from '../types';
+import { Observation, Summary, UserPrompt, StreamEvent, ProjectCatalog } from '../types';
 import { API_ENDPOINTS } from '../constants/api';
 import { TIMING } from '../constants/timing';

@@ -7,16 +7,42 @@ export function useSSE() {
  const [observations, setObservations] = useState<Observation[]>([]);
  const [summaries, setSummaries] = useState<Summary[]>([]);
  const [prompts, setPrompts] = useState<UserPrompt[]>([]);
-  const [projects, setProjects] = useState<string[]>([]);
+  const [catalog, setCatalog] = useState<ProjectCatalog>({
+    projects: [],
+    sources: [],
+    projectsBySource: {}
+  });
  const [isConnected, setIsConnected] = useState(false);
  const [isProcessing, setIsProcessing] = useState(false);
  const [queueDepth, setQueueDepth] = useState(0);
  const eventSourceRef = useRef<EventSource | null>(null);
  const reconnectTimeoutRef = useRef<NodeJS.Timeout>();

+  const updateCatalogForItem = (project: string, platformSource: string) => {
+    setCatalog(prev => {
+      const nextProjects = prev.projects.includes(project)
+        ? prev.projects
+        : [...prev.projects, project];
+      const nextSources = prev.sources.includes(platformSource)
+        ? prev.sources
+        : [...prev.sources, platformSource];
+      const sourceProjects = prev.projectsBySource[platformSource] || [];
+
+      return {
+        projects: nextProjects,
+        sources: nextSources,
+        projectsBySource: {
+          ...prev.projectsBySource,
+          [platformSource]: sourceProjects.includes(project)
+            ? sourceProjects
+            : [...sourceProjects, project]
+        }
+      };
+    });
+  };
+
  useEffect(() => {
    const connect = () => {
-      // Clean up existing connection
      if (eventSourceRef.current) {
        eventSourceRef.current.close();
      }
@@ -27,7 +53,6 @@ export function useSSE() {
      eventSource.onopen = () => {
        console.log('[SSE] Connected');
        setIsConnected(true);
-        // Clear any pending reconnect
        if (reconnectTimeoutRef.current) {
          clearTimeout(reconnectTimeoutRef.current);
        }
@@ -38,9 +63,8 @@ export function useSSE() {
        setIsConnected(false);
        eventSource.close();

-        // Reconnect after delay
        reconnectTimeoutRef.current = setTimeout(() => {
-          reconnectTimeoutRef.current = undefined; // Clear before reconnecting
+          reconnectTimeoutRef.current = undefined;
          console.log('[SSE] Attempting to reconnect...');
          connect();
        }, TIMING.SSE_RECONNECT_DELAY_MS);
@@ -52,32 +76,37 @@ export function useSSE() {
        switch (data.type) {
          case 'initial_load':
            console.log('[SSE] Initial load:', {
-              projects: data.projects?.length || 0
+              projects: data.projects?.length || 0,
+              sources: data.sources?.length || 0
+            });
+            setCatalog({
+              projects: data.projects || [],
+              sources: data.sources || [],
+              projectsBySource: data.projectsBySource || {}
            });
-            // Only load projects list - data will come via pagination
-            setProjects(data.projects || []);
            break;

          case 'new_observation':
            if (data.observation) {
              console.log('[SSE] New observation:', data.observation.id);
-              setObservations(prev => [data.observation, ...prev]);
+              updateCatalogForItem(data.observation.project, data.observation.platform_source || 'claude');
+              setObservations(prev => [data.observation!, ...prev]);
            }
            break;

          case 'new_summary':
            if (data.summary) {
-              const summary = data.summary;
-              console.log('[SSE] New summary:', summary.id);
-              setSummaries(prev => [summary, ...prev]);
+              console.log('[SSE] New summary:', data.summary.id);
+              updateCatalogForItem(data.summary.project, data.summary.platform_source || 'claude');
+              setSummaries(prev => [data.summary!, ...prev]);
            }
            break;

          case 'new_prompt':
            if (data.prompt) {
-              const prompt = data.prompt;
-              console.log('[SSE] New prompt:', prompt.id);
-              setPrompts(prev => [prompt, ...prev]);
+              console.log('[SSE] New prompt:', data.prompt.id);
+              updateCatalogForItem(data.prompt.project, data.prompt.platform_source || 'claude');
+              setPrompts(prev => [data.prompt!, ...prev]);
            }
            break;

@@ -94,7 +123,6 @@ export function useSSE() {

    connect();

-    // Cleanup on unmount
    return () => {
      if (eventSourceRef.current) {
        eventSourceRef.current.close();
@@ -105,5 +133,15 @@ export function useSSE() {
    };
  }, []);

-  return { observations, summaries, prompts, projects, isProcessing, queueDepth, isConnected };
+  return {
+    observations,
+    summaries,
+    prompts,
+    projects: catalog.projects,
+    sources: catalog.sources,
+    projectsBySource: catalog.projectsBySource,
+    isProcessing,
+    queueDepth,
+    isConnected
+  };
 }
--- a/src/ui/viewer/types.ts
+++ b/src/ui/viewer/types.ts
@@ -2,6 +2,7 @@ export interface Observation {
  id: number;
  memory_session_id: string;
  project: string;
+  platform_source: string;
  type: string;
  title: string | null;
  subtitle: string | null;
@@ -20,6 +21,7 @@ export interface Summary {
  id: number;
  session_id: string;
  project: string;
+  platform_source: string;
  request?: string;
  investigated?: string;
  learned?: string;
@@ -32,6 +34,7 @@ export interface UserPrompt {
  id: number;
  content_session_id: string;
  project: string;
+  platform_source: string;
  prompt_number: number;
  prompt_text: string;
  created_at_epoch: number;
@@ -48,10 +51,19 @@ export interface StreamEvent {
  summaries?: Summary[];
  prompts?: UserPrompt[];
  projects?: string[];
+  sources?: string[];
+  projectsBySource?: Record<string, string[]>;
  observation?: Observation;
  summary?: Summary;
  prompt?: UserPrompt;
  isProcessing?: boolean;
+  queueDepth?: number;
+}
+
+export interface ProjectCatalog {
+  projects: string[];
+  sources: string[];
+  projectsBySource: Record<string, string[]>;
 }

 export interface Settings {