tool call {tool_call_id} disappeared during runtime start re

Error message

tool call {tool_call_id} disappeared during runtime start reduction

What it means

Error "tool call {tool_call_id} disappeared during runtime start reduction" thrown in openai/codex.

Source

Thrown at codex-rs/rollout-trace/src/reducer/tool.rs:278

        {
            bail!("tool runtime start would create a second terminal operation for {tool_call_id}");
        }

        // Protocol begin events carry runtime facts such as process ids and
        // cwd. These facts should create terminal rows, but they must not
        // replace the canonical invocation payload captured at dispatch.
        let terminal_operation_id = self.start_terminal_operation_from_runtime(
            seq,
            wall_time_unix_ms,
            &thread_id,
            &tool_call_id,
            &kind,
            &runtime_payload,
        )?;

        if let Some(operation_id) = &terminal_operation_id {
            let Some(tool_call) = self.rollout.tool_calls.get_mut(&tool_call_id) else {
                bail!("tool call {tool_call_id} disappeared during runtime start reduction");
            };
            if tool_call.terminal_operation_id.is_none() {
                tool_call.terminal_operation_id = Some(operation_id.clone());
                tool_call.summary = ToolCallSummary::Terminal {
                    operation_id: operation_id.clone(),
                };
            }
        }

        if terminal_operation_id.is_some() {
            self.sync_terminal_model_observation(&tool_call_id)?;
        }
        self.start_agent_interaction_from_runtime(&tool_call_id, &runtime_payload)?;
        Ok(())
    }

    /// Records a runtime-end observation for an already started tool call.
    pub(super) fn end_tool_runtime_observation(

View on GitHub (pinned to 339751715c)

When it happens

Trigger: Thrown at codex-rs/rollout-trace/src/reducer/tool.rs:278 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of openai/codex@339751715c (2026-08-25). Data as JSON: /api/errors/cebda35aaef8fc4d. Report an issue: GitHub.