{"content":"Development diary for open-agent-connect branch codex/2026-05-05-llm-executor-design.\n\nRound: Final acceptance blocker fix for LLM executor session persistence.\n\nCommit: 9c33f97c77b7c12598eccdb5658b34ce2d393e37 (fix: serialize llm session persistence)\n\nContext:\n- The final overall acceptance subagent found a flaky full-suite failure where `LlmExecutor` could finish streaming but `getSession(sessionId)` returned null.\n- Root cause: provider session ID updates were written fire-and-forget while terminal result updates wrote the same session JSON. The file session manager wrote directly to the final file and swallowed non-ENOENT read/parse failures as null, so an in-flight or interleaved write could look like a missing session and concurrent patches could drop fields.\n\nChanges:\n- Added per-session operation queues for create/update/delete in the file session manager so concurrent patches for one LLM session are serialized and merged from the latest durable record.\n- Replaced direct session JSON writes with temp-file plus rename atomic writes so readers keep seeing the previous complete session while an update is in flight.\n- Changed LLM session JSON reads to return null only for ENOENT and to surface malformed JSON instead of silently treating corruption as a missing session.\n- Added regression tests that failed before the fix: one proves a session remains readable during an in-flight write, and one proves concurrent updates do not drop terminal result/provider fields.\n\nVerification:\n- Red check before implementation: `node --test --test-concurrency=1 tests/llm/llmExecutorCore.test.mjs` failed on the two new session manager tests.\n- Targeted green check: `npm run build && node --test --test-concurrency=1 tests/llm/llmExecutorCore.test.mjs` passed 15/15.\n- Full verification: `npm test && git diff --check` passed. Main suite: 867/867 pass. CLI runtime suite: 66/66 pass. Whitespace check produced no errors.\n\nAcceptance impact:\n- Addresses the final overall acceptance blocker and strengthens the Phase 1 executor persistence foundation used by Phase 2 daemon APIs and Phase 3 execution history UI.","contentType":"text/plain;utf-8","attachments":[],"quotePin":""}