Cron task metadata writes can overlap closely enough that a timestamp-only
$temp filename is not stable. Harden the atomic write path by using a
collision-resistant temp name and retrying once when rename reports ENOENT.
Constraint: Scheduled task persistence must keep atomic replace semantics in ~/.claude/scheduled_tasks.json
Rejected: Add explicit file locking around every scheduled task write | more coordination overhead than the observed transient rename race warrants
Confidence: high
Scope-risk: narrow
Directive: Keep scheduled task writes collision-resistant and retriable; do not revert to timestamp-only temp file names without reproducing concurrent writes
Tested: bun test src/server/__tests__/scheduled-tasks.test.ts
Not-tested: bun test src/server/__tests__/cron-scheduler.test.ts (existing timeouts and unrelated assertion failures in this checkout)
Add complete server-side implementation for the Claude Code Desktop App UI:
- REST API: sessions, conversations, settings, models, scheduled tasks,
search, agents, and status endpoints (9 modules, 30+ endpoints)
- WebSocket: real-time chat streaming with state transitions, ping/pong,
permission request forwarding, and stop generation support
- Services: sessionService (JSONL read/write, CLI-compatible),
settingsService (atomic writes), cronService, searchService (ripgrep),
agentService (YAML management)
- Middleware: CORS (localhost-only), auth, unified error handling
- Tests: 180 tests (unit + E2E + business flow), all passing
- Docs: PRD, UI design spec, server architecture design
Non-invasive: all new code under src/server/, no changes to existing CLI code.
CLI/UI data interop: reads/writes the same JSONL/JSON files as the CLI.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
