When an upstream request was aborted mid-stream (SDK client timeout,
stream idle watchdog, non-streaming fallback timeout, or user
cancellation), the trace fetch hook waited on a clone of the response
body that could hang forever, so the call never left "pending" in the
trace panel — exactly the silent stall that misled the #766 report.
- captureResponseTraceSnapshot reads the body with abort awareness:
reader.cancel() on abort keeps the partial body, with a 2s grace
backstop for runtimes where cancel cannot wake a hung read.
- The fetch hook now records an error-state call on abort with the
abort reason (e.g. the watchdog's stream idle timeout), duration,
partial response body, and an api_call_aborted event; non-abort
capture failures also record an error instead of inferring ok, and
pre-response fetch rejections carry an aborted flag.
- The trace detail panel shows an "Aborted" badge plus guidance for
aborted calls, and labels the new api_call_aborted phase in all
locales.
Tested: bun test src/server/__tests__/trace-capture.test.ts
Tested: bun run check:server
Tested: cd desktop && bun run test -- --run && bun run lint
Compute tool spans from paired tool results, surface session wall/model/tool timing, and keep pending spans updated with elapsed time.
Tested: cd desktop && bun run test -- --run src/lib/traceViewModel.test.ts src/pages/TraceSession.test.tsx
Tested: cd desktop && bun run test -- --run src/pages/TraceList.test.tsx
Tested: bun run check:desktop
Scope-risk: narrow
UI rebuild (desktop):
- TraceSession: replace 3-column layout with two panes — turn-grouped
timeline tree (draggable splitter, search/filter, keyboard nav) and a
section-flow detail panel (Response / Messages / System Prompt /
Tools / Parameters / Raw), collapse state persists across spans
- Render LLM requests/responses semantically: messages as role-colored
conversation with tool_use/tool_result pairing instead of raw JSON
dumps; Raw fallback via CodeViewer for legacy truncated records
- TraceList: row-style list with model chips, mono metrics, hover
actions; content-visibility rows (no virtualization, WebKit-safe)
- i18n synced across zh/en/jp/kr/zh-TW (+25/-55 keys)
Data & capture (server):
- Capture full bodies: preview cap 2048 -> 240k chars, stream cap
256KB -> 1MB; list API trims previews to keep polling light; new
GET /api/sessions/:id/trace/calls/:callId returns the full record
- Extract per-call token usage at read time (SSE + JSON + proxy
wrapped); mtime-keyed read cache for the polling path
- Fix sensitive-key regex redacting *_tokens count fields, which made
token stats always report 0
Frontend data layer:
- SSE stream reassembly (Anthropic + OpenAI chat) adapted from
claude-tap (MIT, attribution in THIRD_PARTY_LICENSES.md), request/
response body parsers, shared formatters, on-demand call detail
cache; traceViewModel gains tokenUsage/isLifecycleNoise, drops
fullRaw
Tested:
- bun run check:server (1201 pass)
- bun run check:desktop (lint + 1358 tests + build)
- Chromium walkthrough against real local traces: list, session tree,
LLM semantic detail (new format), legacy fallback, tool detail
Tested:
- cd desktop && bun run test -- --run src/pages/TraceList.test.tsx
- bun test src/server/__tests__/trace-capture.test.ts
- bun run check:desktop
- bun run check:server
Scope-risk: broad
