fix(ai): send OpenAI agent turns through the Responses API - #1816
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gpt-6-* and gpt-5.6-* reason by default, and /v1/chat/completions rejects function tools for them unless reasoning_effort is "none". #1811 worked around that by retrying every tool turn with reasoning off, which cost a failed request per turn and ran tool loops without reasoning. Agent turns to OpenAI's own endpoint (api.openai.com) now use /v1/responses. Requests are stateless (store: false) and include encrypted reasoning, and each turn's output items are echoed back verbatim, so reasoning carries across tool calls. modelOptions keep their Chat Completions names: reasoning_effort and max_tokens are mapped to reasoning.effort and max_output_tokens. OpenAI-compatible third-party endpoints keep Chat Completions, and the reasoning_effort retry is removed. Claude Opus 5.5 and Fable 5.1 return a documented 400 for tool_choice any/tool. Neither Anthropic's Models API capabilities nor models.dev expose that as metadata, so QuickAdd recognizes the documented error and explains the fix (use "auto" with a prompt hint, or a schema) instead of silently weakening a forced choice to "auto". Amp-Thread-ID: https://ampcode.com/threads/T-01a0df9e-e548-71c1-acd1-5cee32990534 Co-authored-by: Amp <amp@ampcode.com> Co-authored-by: Christian Bager Bach Houmann <christian@bagerbach.com>
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Included review availability: This review used your included allowance. Your plan provides up to 8 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughChat requests to the exact OpenAI API hostname now use the Responses API. The change adds Responses request and response mapping, preserves tool-turn output items, removes reasoning-effort retries for rejected tool turns, and adds guidance for a specific Anthropic forced-tool-choice error. ChangesOpenAI chat request flow
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant OpenAIRequest
participant providerToolMapping
participant providerRequest
participant OpenAIResponsesAPI
OpenAIRequest->>providerToolMapping: buildChatBody for openai-responses
OpenAIRequest->>providerRequest: dispatchProviderRequest
providerRequest->>OpenAIResponsesAPI: POST /responses
OpenAIResponsesAPI-->>OpenAIRequest: response JSON
OpenAIRequest->>providerToolMapping: parseChatResponse
Merge Risk: ⚪ Minimal · up to The reviewed change has no newly established issue requiring a fix before merge. Normal build and test checks still apply. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The new conversation flow warrants review because it carries tool calls across requests. The inspected path retains the existing checks and approvals before a tool runs, and no new access to local tools was established. Broader security coverage remains incomplete. Retained concerns Security review detailsSecurity Blast Radius
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Inline comments:
In @src/ai/tools/providerToolMapping.ts:
- Around line 291-299: Update buildOpenAIResponsesBody to remove
frequency_penalty and presence_penalty from the model parameters before
spreading params into the Responses body; preserve the handling of the other
parameters.
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docs/src/content/docs/docs/QuickAddAPI.mdsrc/ai/OpenAIRequest.sampling.test.tssrc/ai/OpenAIRequest.toolReasoning.test.tssrc/ai/OpenAIRequest.toolTurns.test.tssrc/ai/OpenAIRequest.tssrc/ai/Provider.test.tssrc/ai/Provider.tssrc/ai/providerErrors.test.tssrc/ai/providerErrors.tssrc/ai/providerRequest.tssrc/ai/tools/openai.e2e.test.tssrc/ai/tools/providerToolMapping.test.tssrc/ai/tools/providerToolMapping.ts
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- src/ai/OpenAIRequest.toolReasoning.test.ts
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A safety refusal arrives as a refusal content part, not output_text, so the agent returned an empty string and reported a normal stop. Return the refusal's explanation and mark the stop reason as refusal. Amp-Thread-ID: https://ampcode.com/threads/T-01a0df9e-e548-71c1-acd1-5cee32990534 Co-authored-by: Amp <amp@ampcode.com> Co-authored-by: Christian Bager Bach Houmann <christian@bagerbach.com>
Follow-up: live Anthropic verification (after merge, on master @ 9e43828)Christian provided an Anthropic key, so the forced-tool-choice path is now checked against the real API. Before, it was checked only against a mock. Raw API, 2026-09-26. The live error text matches the documented text, and the pattern in Live wire e2e ( Real Obsidian (1.13.7, throwaway vault),
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…rns on gateways (#1819) * fix(ai): return Chat Completions refusals and retry reasoning tool turns on gateways Chat Completions refusals leave content null and put the explanation in message.refusal, so the agent returned an empty string as a normal stop, and a schema call spent a repair request on it. Return the refusal text with stop reason "refusal", and skip the structured-output repair after a refusal on either OpenAI wire. #1816 moved api.openai.com tool turns to the Responses API and dropped the reasoning_effort "none" retry. Gateways (Azure OpenAI, OpenRouter, LiteLLM) can still serve gpt-6 and gpt-5.6 over Chat Completions, where function tools are rejected while the model reasons. Restore the retry for the Chat Completions wire only; api.openai.com never takes it. Amp-Thread-ID: https://ampcode.com/threads/T-01a0df9e-e548-71c1-acd1-5cee32990534 Co-authored-by: Amp <amp@ampcode.com> Co-authored-by: Christian Bager Bach Houmann <christian@bagerbach.com> * fix(ai): never return a refusal as the structured object Check for a refusal before parsing, so refusal text that happens to be valid JSON can't become result.object. Amp-Thread-ID: https://ampcode.com/threads/T-01a0df9e-e548-71c1-acd1-5cee32990534 Co-authored-by: Amp <amp@ampcode.com> Co-authored-by: Christian Bager Bach Houmann <christian@bagerbach.com> --------- Co-authored-by: Amp <amp@ampcode.com>
Summary
Fixes two tool-calling correctness issues.
1. OpenAI agent turns now use the Responses API. gpt-6-* and gpt-5.6-* reason by default, and
/v1/chat/completionsrejects function tools for them: "Function tools with reasoning_effort are not supported for gpt-6-luna in /v1/chat/completions. To use function tools, use /v1/responses or set reasoning_effort to 'none'." #1811 retried every tool turn withreasoning_effort: "none". That doubled the requests (one 400 per turn) and ran tool loops with reasoning off.getChatWire(provider)sends OpenAI-kind providers onapi.openai.comto a newopenai-responseswire (/v1/responses). Every other OpenAI-compatible endpoint keeps Chat Completions, including lookalike hosts such asapi.openai.com.evil.example.store: false, the same no-retention default as Chat Completions) and ask forreasoning.encrypted_content. Each turn's output items go back verbatim throughproviderRaw, the mechanism Gemini's thought signatures already use, so reasoning carries across tool calls.modelOptionskeep their Chat Completions names:reasoning_effortbecomesreasoning.effort, andmax_tokens/max_completion_tokensbecomemax_output_tokens. Everything else passes through.toolReasoningRetryBodyand its tests are removed.refusalcontent part) comes back as the answer text with stop reasonrefusal, not as an empty string (from review).2. Anthropic forced tool choice. Anthropic's docs (Forcing tool use, errors) say Claude Opus 5.5, Fable 5.1 and Mythos 5.1 return
400 invalid_request_error: tool_choice: type "tool" and "any" are not supported for this model.capabilitiesobject has no tool-choice field, and models.dev has none either. So the documented error text is the signal, not a list of model ids, which also covers models that adopt the rule later.auto. That would drop the script author's "must call a tool" guarantee without telling them.src/gui/AIAssistantProvidersModal.tsis untouched.Proof
Real Obsidian (1.13.7, throwaway e2e vault),
quickAddApi.ai.agenttwo-step tool loopEach outgoing
requestUrlwas recorded at the Electron IPC boundary (path plus a body summary, no headers). Prompt: add 17 + 25 with the tool, then add 100 with the tool.Before (origin/master @ 7ee3e57): 6 requests per run. Every turn is a 400 followed by a retry with reasoning off.
After (this branch): 3 requests per run, reasoning on. Reasoning items are echoed across turns.
dev:errors:No errors captured.Anthropic and OpenAI-compatible routing in real Obsidian. No Anthropic key was available, so a local mock returned Anthropic's documented 400 verbatim whenever
tool_choicewasany/tool. The agent ran againstclaude-opus-5-5:Live wire e2e (
src/ai/tools/openai.e2e.test.ts, now covering both wires)Probes run while designing this: a verbatim echo of reasoning (
encrypted_content) plusfunction_callitems works withstore: falseon gpt-5.6-sol and gpt-6-luna.frequency_penalty/presence_penaltyare accepted on Responses by gpt-4o-mini/gpt-4.1-mini, andinclude: ["reasoning.encrypted_content"]is accepted by non-reasoning models.Review follow-ups (checked live)
/v1/responses:gpt-3.5-turbo,gpt-4,gpt-4-turbo,gpt-4oall returncompletedwith afunction_call, so routing by host is safe.Regression tests
src/ai/OpenAIRequest.toolTurns.test.tsgoes throughchatRequest. It covers the/v1/responsesrouting,call_idrather than the itemid, verbatim echo withfunction_call_output, no reasoning retry, Chat Completions for third-party/proxy/lookalike endpoints, and the Anthropic forced-choice explanation (with other tool_choice errors untouched). The three behaviour tests fail on origin/master.providerToolMapping.test.ts: Responses body shape,modelOptionsrenames and precedence, strict tools, namedtool_choice,text.format, rebuiltfunction_callitems, themax_output_tokens→lengthstop reason, and unparseable arguments.Provider.test.ts(getChatWire) andproviderErrors.test.ts(isForcedToolChoiceUnsupportedError).pnpm run test: 450 files, 5849 passed.pnpm run build-with-lint: clean.Release / migration impact
ai.agent) turns tohttps://api.openai.com/v1now go to/v1/responses. Plainai.promptand the AI Assistant single-prompt path are unchanged (Chat Completions). No settings migration.reasoning_effort: "none"retry is removed, including for OpenAI-compatible proxies. A proxy serving gpt-6 over Chat Completions will surface OpenAI's 400 again; setreasoning_effort: "none"inmodelOptionsthere.QuickAddAPI.mdreplaces the fix(ai): current model seeds and a truthful Sync now notice #1811 retry note and documents the Claude forced-tool-choice limitation.