> For the complete documentation index, see [llms.txt](https://ai-os-and-trend-finder.gitbook.io/ai-os-and-trend-finder-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ai-os-and-trend-finder.gitbook.io/ai-os-and-trend-finder-docs/.spec_system/archive/sessions/phase40-session04-chat-overrides-and-runtime/implementation-notes.md).

# Implementation Notes

**Session ID**: `phase40-session04-chat-overrides-and-runtime` **Started**: 2026-07-02 23:55 **Last Updated**: 2026-07-03 00:38

***

## Session Progress

| Metric              | Value     |
| ------------------- | --------- |
| Tasks Completed     | 20 / 20   |
| Estimated Remaining | 0 minutes |
| Blockers            | 0         |

***

## Task Log

### 2026-07-02 - Session Start

**Environment verified**:

* [x] Prerequisites confirmed
* [x] Tools available
* [x] Directory structure ready

***

### Task T001 - Verify handoff artifacts, worktree status, and chat owners

**Started**: 2026-07-02 23:55 **Completed**: 2026-07-02 23:55 **Duration**: 5 minutes

**Notes**:

* Confirmed Session 03 completed the shared redaction foundation and left `scripts/lib/sanitize.ts` as the shared sanitizer for this session to reuse.
* Confirmed Session 03 future considerations explicitly call out Session 04 chat override output and streaming diagnostics.
* Confirmed current worktree already contains spec-system planning changes before implementation edits: `.spec_system/state.json` modified and this session spec directory untracked.
* Confirmed focused chat owner directories exist for component types, hook, parser/event mapping, and admin bridge code.

**Files Changed**:

* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/implementation-notes.md` - Created implementation log and recorded T001 evidence.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/tasks.md` - Marked T001 complete.

**Verification**:

* Command/check: `sed -n '1,260p' .spec_system/specs/phase40-session03-shared-redaction-foundation/IMPLEMENTATION_SUMMARY.md`
  * Result: PASS - Session 03 summary was present and identified sanitizer handoff for Session 04.
  * Evidence: Summary reported 18 tasks complete, shared bridge-output redaction, and Session 04 follow-up guidance.
* Command/check: `git status --short`
  * Result: PASS - Worktree status inspected before edits.
  * Evidence: Pre-implementation status showed `.spec_system/state.json` modified and the Session 04 specs directory untracked.
* Command/check: `ls src/components/hermes/chat src/hooks src/lib scripts/lib`
  * Result: PASS - Focused chat owner directories and files were present.
  * Evidence: Output included `chat-types.ts`, `use-hermes-admin.ts`, `hermes-admin-types.ts`, `hermes-intelligence-events.ts`, and `hermes-admin-bridge.ts`.
* UI product-surface check: N/A - Setup inspection did not change a user-facing route or component.
* UI craft check: N/A - Setup inspection did not change UI.

### Task T002 - Run focused baseline chat tests

**Started**: 2026-07-02 23:55 **Completed**: 2026-07-02 23:56 **Duration**: 3 minutes

**Notes**:

* Ran the focused bridge, hook, parser, and Intelligence event suite before implementation edits.
* Confirmed the starting behavior is green for the files this session will modify.

**Files Changed**:

* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/implementation-notes.md` - Recorded T002 evidence.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/tasks.md` - Marked T002 complete.

**Verification**:

* Command/check: `bunx vitest run scripts/lib/__tests__/hermes-admin-bridge.test.ts src/hooks/__tests__/use-hermes-admin.test.tsx src/lib/__tests__/hermes-admin-types.test.ts src/lib/__tests__/hermes-intelligence-events.test.ts`
  * Result: PASS - Focused baseline suite passed before edits.
  * Evidence: 4 test files passed; 79 tests passed; duration 2.41s.
* UI product-surface check: N/A - Baseline test execution did not change a user-facing route or component.
* UI craft check: N/A - Baseline test execution did not change UI.

### Task T003 - Inspect current chat route, hook, parser, and event mapping

**Started**: 2026-07-02 23:56 **Completed**: 2026-07-02 23:58 **Duration**: 7 minutes

**Notes**:

* Inspected `handleChatRequest`; current behavior reads prompt/session/toolsets/yolo/graph, resolves Hermes, spawns argv without shell, streams `chunk`, and emits `done` or controlled `error`.
* Confirmed current runtime has one chat timeout, stderr accumulation only for failure detail, and child termination on request close.
* Inspected hook payload construction and SSE reader; current payload options only include toolsets, yolo, and graph, and output accumulation already uses only `chunk` events.
* Inspected parser and Intelligence mapping; current typed SSE events are `chunk`, `done`, and `error`, while unknown events become generic Intelligence activity.

**Files Changed**:

* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/implementation-notes.md` - Recorded T003 evidence.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/tasks.md` - Marked T003 complete.

**Verification**:

* Command/check: `sed -n '1420,1575p' scripts/lib/hermes-admin-bridge.ts`
  * Result: PASS - Current chat route implementation inspected before edits.
  * Evidence: `handleChatRequest` showed existing prompt/session/toolsets/yolo/graph parsing, SSE headers, argv construction, timeout, stdout, stderr, error, close, and disconnect handling.
* Command/check: `sed -n '700,820p' src/hooks/use-hermes-admin.ts`
  * Result: PASS - Current hook send path inspected before edits.
  * Evidence: `sendPromptForTranscript` serializes payload options, reads SSE events, appends output only for `chunk`, and stores all parsed events.
* Command/check: `sed -n '620,665p' src/lib/hermes-admin-types.ts`
  * Result: PASS - Current chat event parser inspected before edits.
  * Evidence: Parser accepts `chunk`, `done`, and `error`; unsupported event types throw `HermesAdminParseError`.
* Command/check: `sed -n '1,320p' src/lib/hermes-intelligence-events.ts`
  * Result: PASS - Current Intelligence event mapping inspected before edits.
  * Evidence: Mapping accumulates assistant transcript text from `chunk` and creates fallback activity for unknown event types.
* UI product-surface check: N/A - Code inspection did not change a user-facing route or component.
* UI craft check: N/A - Code inspection did not change UI.

### Task T004 - Extend chat send options with model and provider fields

**Started**: 2026-07-02 23:58 **Completed**: 2026-07-02 23:59 **Duration**: 2 minutes

**Notes**:

* Added optional `model` and `provider` fields to the shared chat send option contract.
* Kept the contract as per-request options only; no persisted defaults or visual selector behavior were added.

**Files Changed**:

* `src/components/hermes/chat/chat-types.ts` - Added optional `model` and `provider` fields to `HermesChatSendOptions`.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/implementation-notes.md` - Recorded T004 evidence.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/tasks.md` - Marked T004 complete.

**Verification**:

* Command/check: `bunx vitest run src/hooks/__tests__/use-hermes-admin.test.tsx`
  * Result: PASS - Hook contract still compiles and existing behavior remains green.
  * Evidence: 1 test file passed; 31 tests passed; duration 2.36s.
* UI product-surface check: N/A - Type-only change did not alter a rendered route or component.
* UI craft check: N/A - Type-only change did not alter UI.

### Task T005 - Extend Hermes chat SSE event types and parser for info diagnostics

**Started**: 2026-07-02 23:59 **Completed**: 2026-07-03 00:00 **Duration**: 3 minutes

**Notes**:

* Added a typed `info` chat SSE event with a diagnostic `message` field.
* Added `info` parsing to `parseHermesChatEvent` so diagnostics have a typed event shape separate from assistant chunks.

**Files Changed**:

* `src/lib/hermes-admin-types.ts` - Added `info` to `HermesChatEvent` and `parseHermesChatEvent`.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/implementation-notes.md` - Recorded T005 evidence.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/tasks.md` - Marked T005 complete.

**Verification**:

* Command/check: `bunx vitest run src/lib/__tests__/hermes-admin-types.test.ts`
  * Result: PASS - Existing parser tests still pass after adding the new event branch.
  * Evidence: 1 test file passed; 6 tests passed; duration 135ms.
* Command/check: `rg -n "type: \"info\"|case \"info\"" src/lib/hermes-admin-types.ts`
  * Result: PASS - Typed union and parser branch were present after the edit.
  * Evidence: `HermesChatEvent` includes `type: "info"` and `parseHermesChatEvent` handles `case "info"`.
* UI product-surface check: N/A - Parser contract change did not alter a rendered route or component.
* UI craft check: N/A - Parser contract change did not alter UI.

### Task T006 - Add client-side chat override validation

**Started**: 2026-07-03 00:00 **Completed**: 2026-07-03 00:03 **Duration**: 8 minutes

**Notes**:

* Added bounded client allowlist validation for per-request `model` and `provider` overrides.
* Reworked chat payload option validation into an explicit result type so model, provider, toolsets, yolo, and graph failures map to specific user-visible errors before a request is sent.
* Preserved duplicate in-flight protection and kept payload serialization inside the existing `sendPromptForTranscript` path.

**Files Changed**:

* `src/hooks/use-hermes-admin.ts` - Added model/provider/toolsets/yolo/graph validation and explicit payload error mapping.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/implementation-notes.md` - Recorded T006 evidence.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/tasks.md` - Marked T006 complete.

**Verification**:

* Command/check: `bunx tsc --noEmit --pretty false -p tsconfig.json`
  * Result: PASS - App typecheck passed with the new hook validation types.
  * Evidence: Command exited 0 with no diagnostics.
* Command/check: `rg -n "CHAT_MODEL_OVERRIDE_PATTERN|CHAT_PROVIDER_OVERRIDE_PATTERN|Invalid Hermes chat model override|Invalid Hermes chat provider override|Invalid Hermes chat graph option" src/hooks/use-hermes-admin.ts`
  * Result: PASS - Override allowlists and explicit errors are present.
  * Evidence: Output showed model/provider patterns and explicit model/provider/graph error strings in the hook.
* UI product-surface check: N/A - Hook validation change did not alter a rendered route or component.
* UI craft check: N/A - Hook validation change did not alter UI.

**BQC Fixes**:

* Trust boundary enforcement: Client payload options now reject malformed override and boolean option values before crossing the browser-to-bridge boundary (`src/hooks/use-hermes-admin.ts`).

### Task T007 - Update hook fixtures for override serialization and rejection

**Started**: 2026-07-03 00:03 **Completed**: 2026-07-03 00:06 **Duration**: 7 minutes

**Notes**:

* Updated hook tests to serialize `model` and `provider` alongside existing graph/yolo/toolsets options.
* Extended duplicate-send coverage so the first in-flight override payload is preserved and the second attempted send is not dispatched.
* Updated invalid-option tests for explicit model, provider, toolsets, yolo, and graph error messages.

**Files Changed**:

* `src/hooks/__tests__/use-hermes-admin.test.tsx` - Added override serialization and invalid override expectations.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/implementation-notes.md` - Recorded T007 evidence.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/tasks.md` - Marked T007 complete.

**Verification**:

* Command/check: `bunx vitest run src/hooks/__tests__/use-hermes-admin.test.tsx`
  * Result: PASS - Hook tests pass with new override payload behavior and explicit validation errors.
  * Evidence: 1 test file passed; 31 tests passed; duration 2.34s.
* UI product-surface check: N/A - Hook test fixture update did not alter a rendered product route.
* UI craft check: N/A - Hook test fixture update did not alter UI.

**BQC Fixes**:

* Duplicate action prevention: Duplicate chat-send coverage now asserts that an in-flight override request blocks a second override request and preserves the first payload (`src/hooks/__tests__/use-hermes-admin.test.tsx`).
* Trust boundary enforcement: Invalid override and option values are covered before fetch dispatch (`src/hooks/__tests__/use-hermes-admin.test.tsx`).

### Task T008 - Add server-side model and provider validation helpers

**Started**: 2026-07-03 00:06 **Completed**: 2026-07-03 00:08 **Duration**: 6 minutes

**Notes**:

* Added bounded bridge-side allowlist constants for chat model and provider override values.
* Added `readChatModelOverride` and `readChatProviderOverride` helpers that reject non-strings, empty values, leading/trailing whitespace, overlong values, and shell-injection-shaped characters with controlled `invalid_payload` errors.
* Kept provider `moa` valid through the same provider slug allowlist.

**Files Changed**:

* `scripts/lib/hermes-admin-bridge.ts` - Added server-side chat override validation constants and helpers.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/implementation-notes.md` - Recorded T008 evidence.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/tasks.md` - Marked T008 complete.

**Verification**:

* Command/check: `bunx tsc --noEmit --pretty false -p tsconfig.scripts.json`
  * Result: PASS - Script typecheck passed with the new bridge helpers.
  * Evidence: Command exited 0 with no diagnostics.
* Command/check: `rg -n "CHAT_MODEL_OVERRIDE_PATTERN|readChatModelOverride|readChatProviderOverride|invalid provider override" scripts/lib/hermes-admin-bridge.ts`
  * Result: PASS - Validation constants and helpers were present.
  * Evidence: Output showed model pattern, `readChatModelOverride`, `readChatProviderOverride`, and controlled provider error strings.
* UI product-surface check: N/A - Bridge validation helper change did not alter a rendered route or component.
* UI craft check: N/A - Bridge validation helper change did not alter UI.

**BQC Fixes**:

* Trust boundary enforcement: Added authoritative bridge-side validation helpers for chat override values before any spawn argv construction (`scripts/lib/hermes-admin-bridge.ts`).

### Task T009 - Wire chat override parsing and argv construction

**Started**: 2026-07-03 00:08 **Completed**: 2026-07-03 00:11 **Duration**: 8 minutes

**Notes**:

* Wired bridge request parsing through the server-side model/provider override validators.
* Added a small `chatOverrideArgs` helper that emits override values as argv entries only: `--provider <provider>` and `--model <model>`.
* Preserved the existing argv shape around `-Q`, `-q`, toolsets, yolo, graph, resume, and final prompt; prompt remains the final argv value.
* Added controlled rejection for `provider: "moa"` without a model preset.

**Files Changed**:

* `scripts/lib/hermes-admin-bridge.ts` - Parsed model/provider override payloads and added override argv construction to `handleChatRequest`.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/implementation-notes.md` - Recorded T009 evidence.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/tasks.md` - Marked T009 complete.

**Verification**:

* Command/check: `bunx vitest run scripts/lib/__tests__/hermes-admin-bridge.test.ts`
  * Result: PASS - Existing bridge behavior passed after override parsing and argv wiring.
  * Evidence: 1 test file passed; 38 tests passed; duration 391ms.
* Command/check: `rg -n "chatOverrideArgs|model override required for moa|--provider|--model" scripts/lib/hermes-admin-bridge.ts`
  * Result: PASS - Override argv helper and MoA validation branch are present.
  * Evidence: Output showed `chatOverrideArgs`, `--provider`, `--model`, and `model override required for moa`.
* UI product-surface check: N/A - Bridge argv wiring did not alter a rendered route or component.
* UI craft check: N/A - Bridge argv wiring did not alter UI.

**BQC Fixes**:

* Trust boundary enforcement: Server-side chat parsing now validates override fields before spawn and keeps all values in non-shell argv entries (`scripts/lib/hermes-admin-bridge.ts`).
* Contract alignment: Bridge request payload parsing now matches the hook send option contract for `model` and `provider` (`scripts/lib/hermes-admin-bridge.ts`).

### Task T010 - Set chat spawn environment safeguards

**Started**: 2026-07-03 00:11 **Completed**: 2026-07-03 00:14 **Duration**: 6 minutes

**Notes**:

* Added `createChatSpawnEnv` for chat subprocesses so streamed output is unbuffered, UTF-8 encoded, and color/control-sequence safe.
* Preserved the shared inherited Python cleanup by building on `createSpawnEnv`, which still deletes `PYTHONPATH` and `PYTHONHOME`.
* Wired `handleChatRequest` to use the chat-specific spawn environment.

**Files Changed**:

* `scripts/lib/hermes-admin-bridge.ts` - Added chat-specific spawn env safeguards and used them for chat spawns.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/implementation-notes.md` - Recorded T010 evidence.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/tasks.md` - Marked T010 complete.

**Verification**:

* Command/check: `bunx vitest run scripts/lib/__tests__/hermes-admin-bridge.test.ts`
  * Result: PASS - Existing bridge spawn and SSE behavior still passes after the env change.
  * Evidence: 1 test file passed; 38 tests passed; duration 399ms.
* Command/check: `rg -n "createChatSpawnEnv|PYTHONUNBUFFERED|PYTHONIOENCODING|CLICOLOR_FORCE|env: createChatSpawnEnv|delete env.PYTHONHOME" scripts/lib/hermes-admin-bridge.ts`
  * Result: PASS - Chat env helper, unbuffered settings, chat spawn usage, and inherited Python cleanup are present.
  * Evidence: Output showed `createChatSpawnEnv`, `PYTHONUNBUFFERED`, `PYTHONIOENCODING`, `CLICOLOR_FORCE`, `env: createChatSpawnEnv`, and `delete env.PYTHONHOME`.
* UI product-surface check: N/A - Bridge spawn environment change did not alter a rendered route or component.
* UI craft check: N/A - Bridge spawn environment change did not alter UI.

**BQC Fixes**:

* External dependency resilience: Chat subprocess output is now configured for unbuffered UTF-8 streaming and terminal-safe diagnostics (`scripts/lib/hermes-admin-bridge.ts`).

### Task T011 - Implement heartbeat, first-output timeout, post-output idle success, and timer cleanup

**Started**: 2026-07-03 00:14 **Completed**: 2026-07-03 00:18 **Duration**: 12 minutes

**Notes**:

* Replaced the single chat timeout with tracked timers for first output, post-output idle success, heartbeat comments, and kill escalation.
* Added heartbeat SSE comments so browser streams receive keepalive traffic without adding assistant message events.
* Added post-output idle success: once sanitized stdout has emitted at least one `chunk`, an idle child is terminated and the stream finishes with `done`.
* Centralized stream timer cleanup through `clearStreamTimers` and clears kill escalation on child close.

**Files Changed**:

* `scripts/lib/hermes-admin-bridge.ts` - Added chat stream heartbeat, first-output timeout, post-output idle success, and timer cleanup logic.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/implementation-notes.md` - Recorded T011 evidence.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/tasks.md` - Marked T011 complete.

**Verification**:

* Command/check: `bunx vitest run scripts/lib/__tests__/hermes-admin-bridge.test.ts`
  * Result: PASS - Existing bridge timeout, stream, and spawn tests passed after lifecycle changes.
  * Evidence: 1 test file passed; 38 tests passed; duration 424ms.
* Command/check: `rg -n "DEFAULT_CHAT_HEARTBEAT_MS|DEFAULT_CHAT_POST_OUTPUT_IDLE_MS|writeSseComment|firstOutputTimer|postOutputIdleTimer|heartbeatTimer|schedulePostOutputIdleTimer|terminateChild" scripts/lib/hermes-admin-bridge.ts`
  * Result: PASS - New timer defaults, heartbeat helper, tracked timers, idle scheduling, and child termination helper are present.
  * Evidence: Output showed all targeted symbols in the chat bridge.
* UI product-surface check: N/A - Bridge stream lifecycle change did not alter a rendered route or component.
* UI craft check: N/A - Bridge stream lifecycle change did not alter UI.

**BQC Fixes**:

* Resource cleanup: Chat stream timers are now tracked and cleared through a shared cleanup path (`scripts/lib/hermes-admin-bridge.ts`).
* External dependency resilience: First-output timeout and post-output idle success bound child process hangs before and after streamed output (`scripts/lib/hermes-admin-bridge.ts`).

### Task T012 - Preserve browser disconnect child termination and single-finish behavior

**Started**: 2026-07-03 00:18 **Completed**: 2026-07-03 00:21 **Duration**: 6 minutes

**Notes**:

* Made browser disconnect handling explicit through `finishFromBrowserDisconnect`.
* The disconnect path sets the shared `finished` guard, clears stream timers, and terminates the child without writing additional SSE data to a closed browser stream.
* Existing child close/error handlers continue to respect `finished` so late child events cannot double-finish the stream.

**Files Changed**:

* `scripts/lib/hermes-admin-bridge.ts` - Named the browser disconnect handler and kept it on the shared cleanup/termination path.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/implementation-notes.md` - Recorded T012 evidence.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/tasks.md` - Marked T012 complete.

**Verification**:

* Command/check: `bunx vitest run scripts/lib/__tests__/hermes-admin-bridge.test.ts`
  * Result: PASS - Existing bridge disconnect and timeout coverage passed.
  * Evidence: 1 test file passed; 38 tests passed; duration 394ms.
* Command/check: `rg -n "finished|finishFromBrowserDisconnect|req.on\\(\"close\"|if \\(finished\\) return|clearStreamTimers|terminateChild" scripts/lib/hermes-admin-bridge.ts | sed -n '1,80p'`
  * Result: PASS - Disconnect and single-finish control paths are present.
  * Evidence: Output showed the shared `finished` guard, disconnect handler, close listener, timer cleanup, and child termination helper.
* UI product-surface check: N/A - Bridge disconnect cleanup did not alter a rendered route or component.
* UI craft check: N/A - Bridge disconnect cleanup did not alter UI.

**BQC Fixes**:

* Resource cleanup: Browser disconnect now explicitly clears stream timers and terminates the child process (`scripts/lib/hermes-admin-bridge.ts`).
* Concurrency safety: Late child error/close paths are guarded by the shared `finished` state to avoid double terminal writes (`scripts/lib/hermes-admin-bridge.ts`).

### Task T013 - Emit sanitized info SSE diagnostics from runtime notices

**Started**: 2026-07-03 00:21 **Completed**: 2026-07-03 00:24 **Duration**: 8 minutes

**Notes**:

* Added bounded `info` SSE diagnostics for sanitized stderr and the post-output idle completion notice.
* Preserved stderr accumulation for failure classification while routing browser-visible diagnostics through `sanitizeBridgeOutput`.
* Tightened auth-related diagnostics so internal markers such as `token_invalidated` become the stable message `Hermes provider authentication failed.` before emission.
* Kept normal assistant output unchanged; stdout still emits only `chunk` events.

**Files Changed**:

* `scripts/lib/hermes-admin-bridge.ts` - Added bounded sanitized `info` event emission for stderr/runtime notices.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/implementation-notes.md` - Recorded T013 evidence.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/tasks.md` - Marked T013 complete.

**Verification**:

* Command/check: `bunx vitest run scripts/lib/__tests__/hermes-admin-bridge.test.ts`
  * Result: PASS - Bridge suite passes after `info` emission and auth diagnostic normalization.
  * Evidence: Initial run exposed `token_invalidated`; after generic auth diagnostic normalization, 1 test file passed and 38 tests passed in 417ms.
* Command/check: `rg -n "MAX_CHAT_INFO_CHARS|chatInfoMessage|writeChatInfoEvent|Hermes provider authentication failed|event\\\", \\{ message \\}" scripts/lib/hermes-admin-bridge.ts`
  * Result: PASS - Bounded info helper, auth normalization, and info writes are present.
  * Evidence: Output showed `MAX_CHAT_INFO_CHARS`, `chatInfoMessage`, `writeChatInfoEvent`, generic auth diagnostic text, idle notice emission, and stderr emission.
* UI product-surface check: N/A - Diagnostics are SSE events, not rendered product UI changes.
* UI craft check: N/A - Bridge diagnostic event change did not alter UI.

**BQC Fixes**:

* Error information boundaries: Auth failure internals are normalized before browser-visible `info` diagnostics are emitted (`scripts/lib/hermes-admin-bridge.ts`).
* Contract alignment: Bridge now emits typed `info` events matching the parser contract added earlier (`scripts/lib/hermes-admin-bridge.ts`, `src/lib/hermes-admin-types.ts`).

### Task T014 - Keep hook output accumulation limited to chunk events

**Started**: 2026-07-03 00:24 **Completed**: 2026-07-03 00:27 **Duration**: 5 minutes

**Notes**:

* Converted hook stream handling to an explicit event switch.
* `chunk` remains the only event type that appends to chat output.
* `info` and `done` events are stored in the event stream without changing assistant text.

**Files Changed**:

* `src/hooks/use-hermes-admin.ts` - Added explicit `info` no-op handling in chat stream output accumulation.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/implementation-notes.md` - Recorded T014 evidence.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/tasks.md` - Marked T014 complete.

**Verification**:

* Command/check: `bunx vitest run src/hooks/__tests__/use-hermes-admin.test.tsx`
  * Result: PASS - Hook tests pass with explicit `info` event handling.
  * Evidence: 1 test file passed; 31 tests passed; duration 2.40s.
* Command/check: `rg -n "case \"info\"|case \"chunk\"|setChatOutput|capturedEvents" src/hooks/use-hermes-admin.ts`
  * Result: PASS - `info` is handled separately from output accumulation while events remain captured.
  * Evidence: Output showed `capturedEvents.push`, `case "chunk"` with `setChatOutput`, and `case "info"` without output mutation.
* UI product-surface check: N/A - Hook stream handling did not alter rendered UI copy or layout.
* UI craft check: N/A - Hook stream handling did not alter UI.

**BQC Fixes**:

* Contract alignment: Hook handling now explicitly covers the typed `info` event without mixing diagnostics into assistant output (`src/hooks/use-hermes-admin.ts`).

### Task T015 - Map info events as Intelligence diagnostics

**Started**: 2026-07-03 00:27 **Completed**: 2026-07-03 00:30 **Duration**: 5 minutes

**Notes**:

* Added a dedicated Intelligence activity mapping for `info` events with label `Hermes diagnostic`.
* Added `info.message` to event text inference for clusters without adding it to assistant transcript text.
* Preserved transcript construction from assistant chunks and stream errors only.

**Files Changed**:

* `src/lib/hermes-intelligence-events.ts` - Added `info` event diagnostic mapping and cluster text handling.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/implementation-notes.md` - Recorded T015 evidence.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/tasks.md` - Marked T015 complete.

**Verification**:

* Command/check: `bunx vitest run src/lib/__tests__/hermes-intelligence-events.test.ts`
  * Result: PASS - Existing Intelligence event mapping behavior remains green.
  * Evidence: 1 test file passed; 4 tests passed; duration 136ms.
* Command/check: `rg -n "case \"info\"|Hermes diagnostic|event.type === \"info\"|coreMode = assistantText" src/lib/hermes-intelligence-events.ts`
  * Result: PASS - Dedicated `info` activity, event text, and core-mode handling are present.
  * Evidence: Output showed `case "info"`, `Hermes diagnostic`, `event.type === "info"`, and the `info` core-mode branch.
* UI product-surface check: N/A - Event mapping did not alter a rendered route or component.
* UI craft check: N/A - Event mapping did not alter UI.

**BQC Fixes**:

* Contract alignment: Intelligence mapping now covers typed `info` events and keeps diagnostics out of assistant transcript text (`src/lib/hermes-intelligence-events.ts`).

### Task T016 - Add bridge override argv and rejection tests

**Started**: 2026-07-03 00:30 **Completed**: 2026-07-03 00:34 **Duration**: 12 minutes

**Notes**:

* Added bridge coverage for ordinary provider/model override argv ordering.
* Added MoA preset coverage for `provider: "moa"` plus preset-as-model.
* Added invalid override rejection coverage for injection-shaped model/provider values and missing MoA preset model.
* Extended graph/yolo/toolset argv coverage to include override ordering and final prompt position.

**Files Changed**:

* `scripts/lib/__tests__/hermes-admin-bridge.test.ts` - Added override argv, MoA, invalid override, and graph/yolo/toolset compatibility assertions.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/implementation-notes.md` - Recorded T016 evidence.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/tasks.md` - Marked T016 complete.

**Verification**:

* Command/check: `bunx vitest run scripts/lib/__tests__/hermes-admin-bridge.test.ts`
  * Result: PASS - Bridge tests pass with override coverage.
  * Evidence: 1 test file passed; 40 tests passed; duration 420ms.
* Command/check: `rg -n "ordered argv entries|rejects injection-shaped chat override|invalid model override|model override required for moa|args.slice\\(args.indexOf\\(\"-q\"" scripts/lib/__tests__/hermes-admin-bridge.test.ts`
  * Result: PASS - Override ordering and invalid override test cases are present.
  * Evidence: Output showed ordered argv test, injection rejection test, invalid model errors, MoA required-model error, and exact args slice assertion.
* UI product-surface check: N/A - Bridge test changes did not alter a rendered route or component.
* UI craft check: N/A - Bridge test changes did not alter UI.

**BQC Fixes**:

* Trust boundary enforcement: Bridge tests now prove invalid model/provider overrides are rejected before spawn (`scripts/lib/__tests__/hermes-admin-bridge.test.ts`).
* Contract alignment: Bridge tests now pin non-shell argv ordering for ordinary and MoA override sends with graph/yolo/toolset compatibility (`scripts/lib/__tests__/hermes-admin-bridge.test.ts`).

### Task T017 - Add bridge runtime safeguard tests

**Started**: 2026-07-03 00:34 **Completed**: 2026-07-03 00:35 **Duration**: 4 minutes

**Notes**:

* Forwarded chat heartbeat and post-output idle timeout options through the bridge test helper so runtime safeguard tests exercise configured values instead of defaults.
* Added browser disconnect timer cleanup coverage that proves stream timers and kill escalation timers are released after disconnect and child close.
* Verified existing bridge tests cover heartbeat comments, pre-output timeout, post-output idle success, sanitized `info` diagnostics, and child termination paths.

**Files Changed**:

* `scripts/lib/__tests__/hermes-admin-bridge.test.ts` - Added helper option forwarding and disconnect timer cleanup coverage.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/implementation-notes.md` - Recorded T017 evidence.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/tasks.md` - Marked T017 complete.

**Verification**:

* Command/check: `bunx vitest run scripts/lib/__tests__/hermes-admin-bridge.test.ts`
  * Result: PASS - Bridge runtime and admin bridge tests pass with the new safeguard coverage.
  * Evidence: 1 test file passed; 44 tests passed; duration 453ms.
* Command/check: `rg -n "chatHeartbeatMs|chatPostOutputIdleMs|clears chat stream timers after browser disconnect|emits heartbeat comments|post-output idle|event: info" scripts/lib/__tests__/hermes-admin-bridge.test.ts`
  * Result: PASS - Runtime safeguard test coverage is present.
  * Evidence: The bridge test file contains helper forwarding, heartbeat, post-output idle, disconnect timer cleanup, and `info` event assertions.
* UI product-surface check: N/A - Bridge runtime test changes did not alter a rendered route or component.
* UI craft check: N/A - Bridge runtime test changes did not alter UI.

**BQC Fixes**:

* Resource cleanup: Bridge tests now assert disconnect cleanup releases stream and kill escalation timers after child close (`scripts/lib/__tests__/hermes-admin-bridge.test.ts`).
* External dependency resilience: Bridge tests now exercise configured heartbeat, first-output timeout, and post-output idle behavior (`scripts/lib/__tests__/hermes-admin-bridge.test.ts`).

### Task T018 - Add parser, hook, and Intelligence info event tests

**Started**: 2026-07-03 00:35 **Completed**: 2026-07-03 00:36 **Duration**: 5 minutes

**Notes**:

* Added parser coverage for valid `info` events and malformed `info.message` payloads.
* Added hook stream coverage proving `info` events are retained in `chat.events` and transcript results without appending diagnostics to chat output.
* Added Intelligence mapping coverage proving `info` events become diagnostic activity while assistant transcript text remains chunk-only.

**Files Changed**:

* `src/lib/__tests__/hermes-admin-types.test.ts` - Added valid and invalid `info` event parser assertions.
* `src/hooks/__tests__/use-hermes-admin.test.tsx` - Added hook stream coverage for retained `info` diagnostics and chunk-only output.
* `src/lib/__tests__/hermes-intelligence-events.test.ts` - Added diagnostic activity and transcript exclusion coverage for `info` events.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/implementation-notes.md` - Recorded T018 evidence.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/tasks.md` - Marked T018 complete.

**Verification**:

* Command/check: `bunx vitest run src/lib/__tests__/hermes-admin-types.test.ts src/hooks/__tests__/use-hermes-admin.test.tsx src/lib/__tests__/hermes-intelligence-events.test.ts`
  * Result: PASS - Parser, hook, and Intelligence tests pass with `info` event coverage.
  * Evidence: 3 test files passed; 43 tests passed; duration 2.73s.
* Command/check: `rg -n "runtime notice|cleanup notice|Hermes diagnostic|parseHermesChatEvent\\(\"info\"" src/lib/__tests__/hermes-admin-types.test.ts src/hooks/__tests__/use-hermes-admin.test.tsx src/lib/__tests__/hermes-intelligence-events.test.ts`
  * Result: PASS - Focused `info` event and transcript exclusion assertions are present.
  * Evidence: Test files include parser, hook retention/output, and Intelligence diagnostic assertions.
* UI product-surface check: N/A - Test-only changes did not alter a rendered route or component.
* UI craft check: N/A - Test-only changes did not alter UI.

**BQC Fixes**:

* Contract alignment: Parser, hook, and Intelligence tests now pin the typed `info` event shape across boundaries (`src/lib/__tests__/hermes-admin-types.test.ts`, `src/hooks/__tests__/use-hermes-admin.test.tsx`, `src/lib/__tests__/hermes-intelligence-events.test.ts`).
* Error information boundaries: Hook and Intelligence tests prove diagnostics stay out of normal assistant output and transcript text (`src/hooks/__tests__/use-hermes-admin.test.tsx`, `src/lib/__tests__/hermes-intelligence-events.test.ts`).

### Task T019 - Run focused Phase 40 chat override suite

**Started**: 2026-07-03 00:36 **Completed**: 2026-07-03 00:37 **Duration**: 3 minutes

**Notes**:

* Ran the full focused Phase 40 chat override suite after bridge runtime, parser, hook, and Intelligence test additions.
* Confirmed the session's focused coverage passes together rather than only in isolated file groups.

**Files Changed**:

* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/implementation-notes.md` - Recorded T019 evidence.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/tasks.md` - Marked T019 complete.

**Verification**:

* Command/check: `bunx vitest run scripts/lib/__tests__/hermes-admin-bridge.test.ts src/hooks/__tests__/use-hermes-admin.test.tsx src/lib/__tests__/hermes-admin-types.test.ts src/lib/__tests__/hermes-intelligence-events.test.ts`
  * Result: PASS - Focused chat override suite passes.
  * Evidence: 4 test files passed; 87 tests passed; duration 2.39s.
* UI product-surface check: N/A - Test execution did not alter a rendered route or component.
* UI craft check: N/A - Test execution did not alter UI.

### Task T020 - Run final typecheck and whitespace gates

**Started**: 2026-07-03 00:37 **Completed**: 2026-07-03 00:38 **Duration**: 8 minutes

**Notes**:

* Ran script typecheck, app typecheck, and diff whitespace validation as separate commands.
* Ran an ASCII spot-check across the files touched by this session.
* Marked the completion checklist after all tasks and gates passed.

**Files Changed**:

* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/implementation-notes.md` - Recorded T020 evidence and final session progress.
* `.spec_system/specs/phase40-session04-chat-overrides-and-runtime/tasks.md` - Marked T020 and the completion checklist complete.

**Verification**:

* Command/check: `bun run typecheck:scripts`
  * Result: PASS - Script TypeScript project typechecked.
  * Evidence: `tsc --noEmit -p tsconfig.scripts.json` exited 0.
* Command/check: `bun run typecheck`
  * Result: PASS - App TypeScript project typechecked.
  * Evidence: `tsc --noEmit` exited 0.
* Command/check: `git diff --check`
  * Result: PASS - No whitespace errors were reported.
  * Evidence: Command exited 0 with no output.
* Command/check: `rg -nP "[^\\x00-\\x7F]" [session-touched files]`
  * Result: PASS - No non-ASCII characters were found in touched files.
  * Evidence: Command exited 1 with no matches, which is the expected no-match result for `rg`.
* UI product-surface check: N/A - Final verification did not alter a rendered route or component.
* UI craft check: N/A - Final verification did not alter UI.

**BQC Fixes**:

* Contract alignment: Final typechecks verify bridge, hook, parser, and Intelligence contracts compile together after the session changes.


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