fix: switch OpenAI backend to Responses API - #98
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Genkit routes OpenAI through the legacy Chat Completions endpoint, preventing Captain from using newer Responses API capabilities. Register a direct official SDK adapter that preserves Captain's streaming, structured output, caller-tool, usage, and durable approval contracts while leaving the other API backends on Genkit. Amp-Thread-ID: https://ampcode.com/threads/T-01a037fc-c3f8-73b6-89ca-149adf6cf1f2
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. WalkthroughThe OpenAI backend now uses a direct Responses API provider. It supports streaming, structured output, tool calls, attachments, usage tracking, and resumable tool approvals. Related mocks and tests validate the Responses API path. ChangesOpenAI Responses API runtime
Sequence Diagram(s)sequenceDiagram
participant Caller
participant OpenAIProvider
participant OpenAIResponsesAPI
participant ToolHandler
Caller->>OpenAIProvider: ExecuteStream(request)
OpenAIProvider->>OpenAIResponsesAPI: send prepared Responses input
OpenAIResponsesAPI-->>OpenAIProvider: stream text or function call
OpenAIProvider->>ToolHandler: execute approved function
ToolHandler-->>OpenAIProvider: return serialized result
OpenAIProvider->>OpenAIResponsesAPI: submit function-call output
OpenAIResponsesAPI-->>OpenAIProvider: stream final response
OpenAIProvider-->>Caller: emit events and completion
Merge Risk: 🔵 Low · up to The provider migration may accept syntactically valid JSON that does not satisfy the requested schema, which could allow nonconforming structured outputs into downstream processing. The PR is otherwise mergeable with explicit owner awareness or follow-up on local schema enforcement. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Inline comments:
In `@pkg/ai/provider/openai/input.go`:
- Around line 58-70: In the request setup flow around EffortConfig and the
resolved p.model, emit the resolved agent identity once per request using the
repository logging path, formatted as agent:model with :effort appended when an
effort is resolved. Use the existing request/provider logger and avoid adding
duplicate identity logs.
- Around line 72-84: Add local structured-output validation to the streaming
completion path after JSON parsing and before reporting success, validating
against Prompt.Schema or Prompt.SchemaJSON with the configured SchemaStrictness.
Keep SchemaJSONForBackend for provider-specific request formatting, but reuse
the existing local validation mechanism so outputs violating enum, minItems,
maxLength, or other constraints are rejected.
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pkg/ai/provider/genkit/genkit.gopkg/ai/provider/init.gopkg/ai/provider/openai/approval.gopkg/ai/provider/openai/input.gopkg/ai/provider/openai/provider.gopkg/ai/provider/openai/tools.gopkg/aimock/e2e_codex_cli_test.gopkg/aimock/genkit_test.gopkg/aimock/openaimock/server.go
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Preserve configured GPT-5.6 reasoning effort when caller tools are present and avoid overflow-prone slice capacity arithmetic flagged by CodeQL. Poll the mock journal for completed streaming requests so the E2E surface assertion cannot race the server's final journal write. Amp-Thread-ID: https://ampcode.com/threads/T-01a037fc-c3f8-73b6-89ca-149adf6cf1f2
adityathebe
marked this pull request as ready for review
August 25, 2026 12:45
The OpenAI SDK decodes persisted response messages as input messages because both share type message. This drops the output content and makes the resumed Responses request invalid. Tag checkpoint items by request or response union and restore response items from their raw wire form. Read restored function calls from the wire payload because SDK ToParam values keep their fields in override metadata. Amp-Thread-ID: https://ampcode.com/threads/T-01a037fc-c3f8-73b6-89ca-149adf6cf1f2
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Summary by CodeRabbit
New Features
Bug Fixes
Documentation
Tests