Eric Allam
69acdc2b32
## Summary Large error stacks and messages can OOM the worker process when serialized into OTel spans or `TaskRunError` objects. This was reported when throwing an error with a massive `.stack` property from a chat agent hook. This adds frame-based stack truncation (similar to Sentry's approach) plus message length limits, applied consistently across all error serialization paths. ### What changed **`packages/core/src/v3/errors.ts`** - `truncateStack()` — parses `error.stack` into message lines + frame lines, caps at 50 frames (keep top 5 closest to throw + bottom 45 entry points, with "... N frames omitted ..." in between). Individual lines capped at 1024 chars. - `truncateMessage()` — caps error messages at 1000 chars - Applied in `parseError()` and `sanitizeError()` **`packages/core/src/v3/otel/utils.ts`** - `sanitizeSpanError()` now uses `truncateStack` and `truncateMessage` from `errors.ts` instead of duplicating truncation logic - Non-Error values (strings, JSON) capped at 5000 chars **`packages/core/src/v3/tracer.ts`** - `startActiveSpan` catch block now delegates to `recordSpanException()` instead of calling `span.recordException()` directly ### Limits | What | Limit | Rationale | |------|-------|-----------| | Stack frames | 50 | Matches Sentry's `STACKTRACE_FRAME_LIMIT` | | Top frames kept | 5 | Closest to throw site | | Bottom frames kept | 45 | Entry points / framework frames | | Per-line length | 1024 | Matches Sentry, prevents regex DoS | | Message length | 1000 | Bounded but generous | | Generic string (non-Error) | 5000 | Fallback for JSON/string errors in spans | ## Test plan - [x] 17 unit tests in `packages/core/test/errors.test.ts` - [x] E2E: threw a 300-frame / 5000-char-message error in the ai-chat reference app, verified truncated stack and message in span via `get_span_details` - [x] Verified the run survived the error (no OOM, continued waiting for next message)
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