Cause (Documented platform behavior): SDK validates tool_choice against the tools actually sent after filtering; empty or mismatched lists are rejected client-side instead of producing a provider 400.
Fix status: documented_behavior
Other error fragments:
- does not match any available tool or handoff in Chat Completions mode.
- does not match any available tool in the outgoing Responses request.
Evidence (public sources, summarized; not reproduced by this contributor):
- https://raw.githubusercontent.com/openai/openai-agents-js/fdaf0a66ca6e9d89498909ad7cf64745630e8afb/packages/agents-openai/src/openaiChatCompletionsConverter.ts (official_docs, unknown, documented_behavior): Chat Completions converter throws for required with no tools and for a named choice not matching any tool or handoff.
- https://raw.githubusercontent.com/openai/openai-agents-js/fdaf0a66ca6e9d89498909ad7cf64745630e8afb/packages/agents-openai/src/openaiResponsesModel.ts (official_docs, unknown, documented_behavior): Responses model throws parallel errors listing available tool choices.
Search phrasings: toolChoice required requires at least one available tool openai agents; modelSettings.toolChoice does not match any available tool
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Run fails before sending the request with a toolChoice validation UserError.
- Context
- Product: OpenAI Agents SDK (JavaScript/TypeScript) Component: @openai/agents-openai toolChoice validation Operation: Agent with modelSettings.toolChoice 'required' or a named tool Affected versions: observed in @openai/agents source at version 0.18.0; introduction version unknown Environment: unknown Exception: UserError Packages: @openai/agents source at 0.18.0 (main fdaf0a6) Trigger: toolChoice 'required' when all tools are filtered/disabled (isEnabled false) for the turn, or forcing a tool name not in the outgoing request.
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- modelSettings.toolChoice="required" requires at least one available tool in Chat Completions mode.
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [OpenAI Agents JS] Chat Completions model: 'modelSettings.toolChoice="required" requires at least one available tool'
Recommended action: Ensure at least one enabled tool when using 'required', match toolChoice to an exact tool name, or use 'auto'; consider resetToolChoice behavior across turns.
Option: Align toolChoice with enabled tools [evidence: documented_workaround]
Steps:
1. Check tool isEnabled predicates
2. Use toolChoice 'auto' when tools may be absent
Expected: Request proceeds
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- dc230f1f-edb5-4928-bbbb-a6846392eadd
- Proposed action
- Recommended action: Ensure at least one enabled tool when using 'required', match toolChoice to an exact tool name, or use 'auto'; consider resetToolChoice behavior across turns. Option: Align toolChoice with enabled tools [evidence: documented_workaround] Steps: 1. Check tool isEnabled predicates 2. Use toolChoice 'auto' when tools may be absent Expected: Request proceeds
- Applicability
- Applicability is not yet established (unknown)
- Limitations
- Limitations have not been established (unknown)
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
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Sources and related records
No source relations recorded.