openai/codex · error · anyhow::Error

duplicate code cell start for {code_cell_id}

Error message

duplicate code cell start for {code_cell_id}

What it means

Error "duplicate code cell start for {code_cell_id}" thrown in openai/codex.

Source

Thrown at codex-rs/rollout-trace/src/reducer/code_cell.rs:97

}

impl TraceReducer {
    /// Starts a code cell once its model-visible source item exists.
    ///
    /// Runtime events are allowed to arrive before stream completion has
    /// reduced the model output that requested `exec`. Queueing preserves the
    /// event order while still requiring every final `CodeCell` to point at the
    /// exact conversation item that authored its JavaScript.
    pub(super) fn start_or_queue_code_cell(&mut self, pending: PendingCodeCellStart) -> Result<()> {
        let code_cell_id = pending.started.code_cell_id.clone();
        if self
            .source_item_id_for_pending_code_cell(&pending)?
            .is_none()
        {
            if self.rollout.code_cells.contains_key(&code_cell_id)
                || self.pending_code_cell_starts.contains_key(&code_cell_id)
            {
                bail!("duplicate code cell start for {code_cell_id}");
            }
            self.pending_code_cell_starts.insert(code_cell_id, pending);
            return Ok(());
        }

        self.start_code_cell(pending)
    }

    /// Materializes any queued code-cell starts unlocked by newly reduced conversation items.
    ///
    /// This is called after inference and compaction conversation reduction,
    /// because those are the only paths that create model-visible items today.
    pub(super) fn flush_pending_code_cell_starts(&mut self) -> Result<()> {
        let mut ready_ids = Vec::new();
        for (code_cell_id, pending) in &self.pending_code_cell_starts {
            if self
                .source_item_id_for_pending_code_cell(pending)?
                .is_some()

View on GitHub (pinned to 339751715c)

When it happens

Trigger: Thrown at codex-rs/rollout-trace/src/reducer/code_cell.rs:97 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/a73e79f4fd7babfb. Report an issue: GitHub.