Review image

review-image

Use this skill when you want a cheap vision-model opinion on an image before doing heavier work.

When to use

• Quick VRT sanity checks
• Detect obviously broken, blank, malformed, or suspicious inputs
• Ask a model whether a screenshot or generated image matches a prompt
• Add a simple image-review gate to CI

Requirements

• Deno
• OPENROUTER_API_KEY or OPENROUTER_KEY

Invocation

Both scripts are executable Deno files with shebang #!/usr/bin/env -S deno run --allow-env --allow-net --allow-read. Run them directly — no deno run wrapper needed.

When the skill is APM-installed, the scripts live under ~/.claude/skills/review-image/scripts/. Examples below use the ~/... form, which is shell-expanded. In non-shell exec contexts (e.g. child_process.spawn without shell: true) both ~ and $HOME stay literal — substitute the resolved absolute path (/Users/<you>/.claude/skills/review-image/scripts/...).

Flags can appear before, between, or after the positional args. --model accepts both --model X and --model=X. Both scripts write program output to stdout and logs/errors to stderr — but only the JSON-emitting modes (CI gate always; freeform with --json) are safe to pipe straight into jq / JSON.parse. Freeform default mode is prose, not JSON.

Scripts

Freeform review — review-image.ts

~/.claude/skills/review-image/scripts/review-image.ts <image-path-or-url> "<prompt>" [--model <id>] [--json]

# example with flag interleaved with positionals:
~/.claude/skills/review-image/scripts/review-image.ts ./shot.png "VRT diff broken?" --model google/gemini-2.5-flash

Default output: plain prose on stdout (the model's reply, single block).

With --json: stdout becomes a single JSON object, safe to pipe into jq / JSON.parse:

{
  "id": "gen-...",
  "model": "<resolved>",
  "text": "<freeform answer>",
  "usage": { "prompt_tokens": 123, "completion_tokens": 45, "total_tokens": 168, "cost": 0.0001 },
  "raw": { /* full upstream OpenRouter response, opaque */ }
}

Read .text for the answer; .usage.cost (USD) and .usage.total_tokens for cost telemetry.

Exit codes: 0 on success, 1 on any error (missing API key, network/HTTP failure, malformed response).

CI gate — review-image-ci.ts

~/.claude/skills/review-image/scripts/review-image-ci.ts <image-path-or-url> "<prompt>" [--model <id>]

Always prints a single JSON object on stdout (the --json flag is silently ignored without warning — output is always JSON):

{
  "decision": "pass",
  "summary": "<short reason>",
  "issues": [],
  "model": "<resolved>",
  "usage": { "prompt_tokens": 123, "completion_tokens": 45, "total_tokens": 168, "cost": 0.0001 },
  "rawText": "<unparsed model reply>"
}

issues is always an array of strings (never null / never omitted) — empty on pass, populated with one or more reasons on fail. usage keys match the freeform script and may include additional OpenRouter-passthrough fields (e.g. is_byok, *_details); treat the four listed keys (prompt_tokens, completion_tokens, total_tokens, cost) as the stable contract.

The CI gate wraps your prompt internally with strict JSON-schema instructions for the model. Write <prompt> as plain English describing the gate criteria — do not include schema, formatting directives, or "respond in JSON" yourself; those are supplied automatically and your additions can conflict with them.

Exit codes:

• 0 — decision: pass
• 2 — decision: fail
• 1 — script error (missing API key, network/HTTP failure, malformed model response). Treat as neither pass nor fail in CI; do not gate on $? -ne 0 alone.

Writing prompts

The <prompt> argument is plain English describing what to check. Use these as starting templates:

CI gate (gate-criteria style) — describe what should be there and what counts as failure. Avoid vague "is this broken?"; pixel art and intentionally low-res content fail naively-worded gates:

"This image is {expected: a Playwright screenshot of /dashboard / a generated cactus illustration / ...}. Pass if it shows recognizable intended content (any style, including pixel art, low-res, or stylized). Fail only if blank, all-black/all-white, corrupted, an error page, or visibly malformed."

Freeform (diagnostic style) — ask for specifics so the prose answer is actionable:

"This image is supposed to be {expected subject}. Describe what you see and call out any visual artifacts, broken layout, color anomalies, or signs of file corruption."

Default model

google/gemini-2.5-flash-lite

Override per call with --model or globally with OPENROUTER_MODEL.