The Loop Agent Skill

THE LOOP

A screenshot shows a moment; it cannot show a flow. THE LOOP records the

actual running target, watches the recording, and judges it against pass

criteria you state in plain language. The loop only observes — YOU apply

the fixes, then iterate. On pass it renders a before/after MP4 + GIF as

proof.

UI / web page / desktop window

watch-skill loop start "<url | screen: | window:<title> | file>" "<pass criteria>" [--script '<json steps>']
# ...apply the suggested fixes to the code...
watch-skill loop iterate <loop_id>

• Pass criteria are ordinary sentences: "the checkout completes, no

error toast ever appears, the total is never NaN". Negative claims

("never X") and exemplars ("a real price (like $29.00)") are both

understood and enforced deterministically.

• --script replays the same clicks/fills every iteration, so the

comparison is honest.

• Only call iterate after you actually changed something. It diffs

against the previous iteration: fixed / unchanged / new.

Generated video (Manim, Remotion, ffmpeg, AI-gen)

watch-skill loop video-gen "<what the video must show>" "<render command>" --output <file>

Re-runs the generator each iteration and judges the fresh render against

the spec.

Game / simulation

watch-skill loop game "<canvas-url | window:<title> | screen:>" "<pass criteria>" [--run "<launch cmd>"]

Catches the failures screenshots miss: a NaN score counter, black

flicker frames, sprites that vanish mid-motion.

Watch for a condition (monitoring)

watch-skill loop monitor "<folder | url | screen: | window:<title>>" "<condition>" [--interval 10] [--max-checks 10]

Bounded — it always terminates. Events land in events.jsonl under the

loop directory as structured records.

Record without judging

watch-skill capture "<target>" [--duration 10]

Capture alone never critiques; it just records, analyzes, and indexes.

Use loop start when there are pass criteria.