- Match tool results against pending tool calls and downgrade unmatched results to user messages.
- Prevent downgraded orphaned tool results from consuming images intended for user turns.
- Unwrap protocol wrapper envelopes and extract structured text parts while preserving arbitrary business JSON.
- Provide a placeholder for empty or whitespace-only tool results.
Closes: #5911
- Track and aggregate tool calls by call ID instead of slot index in streaming and buffered execution.
- Support raw arguments from invalid JSON fields for custom tool calls.
- Parse usage field 4 as cache write tokens instead of adding to prompt tokens.
- Align client metadata with the default client name and drop deprecated tag 28.
Closes: #5910
- Filter out `automation_update` tools and sanitize tool descriptions in Devin wire requests and logs.
- Strip additional Codex prompt directives from system messages.
- Support `children` field fallback when collecting namespace tools.
Devin upstream occasionally encodes transient capacity failures using
Connect code permission_denied with message containing 'high demand'.
CPA's ParseDevinTrailerError currently maps every permission_denied to
HTTP 403. The auth cooldown manager interprets 403 as a 30-minute model
permission cooldown, keeping a recovered model locally unavailable.
This fix narrowly reclassifies the observed high-demand variant as
HTTP 429 (Too Many Requests), so it enters the quota/retry cooldown
path instead of the long permission denial path. Genuine
permission_denied errors (model access denied, plan entitlement denied,
etc.) remain HTTP 403.
Tests: 4 new cases in TestParseDevinTrailerError covering transient
high-demand (429), genuine permission error (403), resource_exhausted
unchanged (429), and case-insensitive matching. All existing tests
pass with no regressions.
- Wire parity: align Connect-RPC Sentry-Trace, User-Agent suppression, float32 double pattern, and dynamic 732-char hex device fingerprint
- Session ordinal & cache: implement process-scoped Field 15.2 with bounded LRU (5000 entries) and Field 15.4=14 user boundary; prioritize stable session_id over previous_interaction_id to preserve prompt caching
- Streaming robustness: unblock hung TCP reads on client cancellation via context watcher; accurately propagate stream read errors and trailer errors instead of swallowing truncated frames
- Thought signature & reasoning: emit raw delta signatures directly in active thought steps; eliminate redundant tail base64 re-encoding; ensure 1:1 assistant signature and thinking alignment across multi-turn history
- Tool call de-multiplexing: route parallel tool calls by tc.Index in both streaming step events and non-streaming aggregations
- Security & transport: escape OAuth callback error HTML against reflected XSS, enforce strict state validation, and isolate Devin HTTP transport with tr.Clone()
