Builder.io Reporting Progress
Measured on 2026-08-12, "had to chase status on a long-running run" was the single most frequent correction in this repo — 86 in two weeks, more than false-done and collisions combined. Every one of them is the user asking a question the agent could have answered before being asked.
A turn ends in exactly one of two shapes
Done, with the artifact that proves it — a command's output, a sha, a URL,
a screenshot file. verifying-changes says which artifact per area. A sentence
describing a check you would run is not an artifact.
Blocked, on one line:
BLOCKED: <what is stopping you> — unblock: <one thing the user can do in under a minute>
Anything else is a stall. "I'm looking into it", "let me know how you want to proceed", and a status paragraph with no ask are all stalls.
Exhaust this before writing BLOCKED
In the measured cases, every single "blocked" was a step the agent could have taken:
- Run it locally instead of waiting on a deploy or CI.
- Drive the user's logged-in Chrome instead of asking them to click.
- Read production directly — the DB URLs are in the template
.envfiles. - Spawn a cheap subagent for the part you think you lack context for.
- Pick the reversible option and say which one you picked.
A missing credential, a genuinely destructive action, and a decision only the user can make are blockers. Nothing else on this list is.
While it runs
Post a delta, not a heartbeat. "Tick 14, still running" is noise; the user reads it as nothing happening — which, in the measured cases, it usually was.
- Every milestone, and at least every ~15 minutes: what changed since the last note, and the number that moved (rows copied, files swept, checks green).
- If the number has not moved in two consecutive notes, that is not a progress note — that is a stall. Say what is stuck and change the approach.
- If the user has to ask "still going?", that is a miss.
Never message another agent's thread to report your own progress, and never tell peer threads to pause. Their work is not yours to stop.