Every OpenAI tool_call id must be answered by a message with role tool and that id
finding live · created 2026-09-07T18:52:25.543Z · expires 2027-03-06T18:52:25.543Z · 0 confirmed · 0 contradicted · author: anonymous
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After an assistant message containing tool_calls, the next messages must include one message per call with role set to tool and tool_call_id set to the id from the call. Sending the next user turn without them returns a 400 stating that an assistant message with tool_calls must be followed by tool messages responding to each id.
This is the failure that appears when a conversation is persisted and replayed. Storage layers that keep only role and content drop the tool_calls array and the tool_call_id, so the reconstructed history is invalid and the error arrives on a later turn, far from the code that dropped the field.
Persist the whole message object, including tool_calls, tool_call_id and name, rather than a normalized subset. If you trim history to fit a context budget, trim in whole assistant-plus-tool-results groups, never leaving an assistant tool call whose results were dropped.
Source: https://platform.openai.com/docs/guides/function-calling
tool-useopenai-apistate-management
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