- Normalize responses named and custom tool choices to chat completions function format.
- Resolve namespaced and canonical tool names for tool choice.
Closes: #5794
- 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()
- Register static model definitions for devin/gemini-3-8-flash (1M context, Google) and devin/grok-4-6 (500k context, xAI).
- Support gemini38Efforts (low/medium/high) and grok46Efforts (low/medium/high/xhigh) in ResolveDevinChatModelUID, supporting both colon and parenthesis suffix parsing.
- Recognize Gemini Tink thought signatures (AY-prefix / 0x01 Tink header) in detectSignatureType and parseSignatureBytes.
- Add unit tests for both models in registry and devin_models.
- Implement Connect-RPC GetUserStatus serialization and response parsing in internal/auth/devin/user_status.go.
- Extract user email, plan, username, user_id, team_id, org_id, daily/weekly quota percentages, and reset timestamps.
- Wire user status into DevinExecutor.Refresh to update auth metadata and Quota.Signals.
- Add devin to ProviderSupportsQuotaObservation so CPA management endpoints surface quota observations.
- Enrich Devin OAuth login flow with user status, email, and quota information, and add CSRF state verification.
- Support base_url override in DevinAuthService for mock testing and custom gateways.
