Apply Discord-dark rcParams. Idempotent.

Single attempt: read parent → create tree → create commit → advance ref. Returns (success, retryable_conflict). retryable_conflict is True iff th

Build the formatted issue body.

Build a prompt for the AI from the GitHub context.

Calculate column widths using per-segment measurement.

Make API call with tool support and handle tool calls.

Check if an issue has changes and notify subscribers.

Create one git blob per artifact and return tree-item dicts. Blobs are content-addressed so they're created once and reused across ref-update