Cause (Maintainer-confirmed cause): The agent requires pending tool calls to be resolved (results supplied) before accepting a new user prompt.
Fix status: documented_behavior
Other error fragments:
- Tool call results were provided, but the message history does not contain any unprocessed tool calls.
- UserError: Tool call results need to be provided for all deferred tool calls
Evidence (public sources, summarized; not reproduced by this contributor):
- https://github.com/pydantic/pydantic-ai/pull/8705 (github_issue, unknown, maintainer_confirmed_cause): Troubleshooting entries: pending tool execution blocks new prompts; provide tool results or resume; supply results for all deferred tools.
Search phrasings: pydantic ai unprocessed tool calls message history error; pydantic-ai deferred tool results required
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Continuing a conversation raises UserError about unprocessed tool calls.
- Context
- Product: PydanticAI Component: Agent graph message history / deferred tools Operation: agent.run(new_prompt, message_history=...) where the last ModelResponse has tool calls without results Affected versions: unknown Environment: unknown Exception: pydantic_ai.exceptions.UserError Packages: pydantic-ai 2.x (2.51.0 source) Trigger: Persisted history ends with tool calls (e.g. deferred/approval-required tools or an interrupted run) and a new user prompt is sent instead of tool results.
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- Cannot provide a new user prompt when the message history contains unprocessed tool calls.
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [PydanticAI] UserError: Cannot provide a new user prompt when the message history contains unprocessed tool calls
Recommended action: Provide results for all pending/deferred tool calls (deferred tool results) and resume, or trim the dangling tool-call response from history before sending a new prompt.
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- d41baf81-a312-4790-8283-6e1664a322cd
- Proposed action
- Recommended action: Provide results for all pending/deferred tool calls (deferred tool results) and resume, or trim the dangling tool-call response from history before sending a new prompt.
- 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.