peilin-openai 62197a65e5 Add diagnostic reasons to MCP attribution errors (#47899) ...

## Why

The `attribution_error` status does not explain why MCP attribution is incomplete. Preserve a diagnostic reason so callers can distinguish history and recorder errors from request serialization failures.

## What changed

- Add optional `error_reason` diagnostics to `McpAttribution`, retaining the first recorder error through checkpoints, compaction, resume, and fork.
- Identify missing or invalid checkpoints, conflicting sources, invalid sources, and poisoned recorder state. Use `restored_error_unknown` for older error checkpoints without a reason.
- Distinguish `payload_too_large` from `serialization_failed` in request metadata fallbacks.
- Tolerate missing, unknown, or malformed diagnostic reasons when reading history, without letting diagnostics determine attribution status.

## Testing

Add coverage for reason preservation, recorder poisoning, backward-compatible checkpoint decoding, resume and cold-fork restoration, and request metadata serialization, including oversized payloads.

GitOrigin-RevId: 389b9446fae119f793978f3e7e4a926677e84d8c

2026-09-24 18:06:07 +00:00

..

schema

Add diagnostic reasons to MCP attribution errors (#47899)

2026-09-24 18:06:07 +00:00

scripts

Generate Python SDK types from repository app-server schemas (#44032)

2026-09-09 03:27:31 +00:00

src

Support bearer tokens for app-server executor connections (#47648)

2026-09-23 20:05:37 +00:00

BUILD.bazel

Add a cacheable Bazel app-server schema bundle (#42174)

2026-09-02 02:00:18 +00:00

Cargo.toml

Keep credentials out of app-server logs (#39993)

2026-08-21 19:04:32 +00:00