- 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.
- Add example payload filter rules in `config.example.yaml` for stripping tools from both flat and nested `additional_tools` Codex request payloads.
Closes: #5792
- Define a managed Claude beta set to distinguish proxy-governed betas from caller extensions.
- Forward unmanaged caller betas on direct Anthropic endpoints to support newer client features.
Closes: #5738
- Avoid acquiring write mutex in ping handlers so keepalive pongs reply immediately during active writes.
- Stream payload messages larger than 32KB in chunks using writer streams.
- Support ephemeral websocket sessions for sessionless execution and enrich disconnect logs with session kind and terminal event context.
Closes: #5734
- Add kimi-k2.8 and kimi-k2.8-code with 1M context, 64k completion tokens, low/high/max thinking, and zero_allowed support to models.json.
- Remap K2.8 aliases (kimi-k2.8, k2.8, kimi-k2.8-code, k2.8-code, and -preview variants) to upstream canonical kimi-for-coding.
- Normalize temperature for Kimi upstream to prevent 400 errors (strict 0.6 for disabled thinking, 1.0 for enabled).
- Align zero_allowed: true across K2.8 and K3 models based on live upstream verification of thinking.type=disabled.
- Add test coverage for model normalization, thinking replay family, temperature stripping, and Claude effort=max preservation.
- Derive billing fingerprint message text from the first user message to prevent prompt cache invalidation across turns.
- Centralize continuity tag resolution to maintain stable prompt IDs and request references across requests.
Closes: #5730
- Inspect `input` items for the latest `configuration_update` reasoning effort before falling back to top-level configuration.
- Route `codex`, `xai`, and `openai-response` providers through usage-specific thinking config extraction.
- Support `none`, `auto`, and explicit reasoning level modes from in-turn updates.
Closes: #5714
- Add `BaseURL` field to usage records and host auth file entries.
- Extract `base_url` from auth attributes and metadata during usage reporting.
- Propagate `base_url` through plugin usage adapters and runtime auth callbacks.
Closes: #5693
- Synthesize function response parts for interrupted or missing OpenAI Responses tool calls to maintain strict Gemini call-response pairing.
- Preserve function response ordering matching pending call IDs across parallel and partial tool execution turns.
- Degrade gracefully to the original request payload when Antigravity reasoning replay breaks Gemini function call pairing.
Closes: #5682
