Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add agents/benrben/mpga/visual-testergit clone --depth 1 https://github.com/benrben/MPGAWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00021 | $0.00314 |
| Opus 5 | $0.00010 | $0.00157 |
| Sonnet 5 | $0.00004 | $0.00063 |
| Haiku 4.5 | $0.00002 | $0.00031 |
Grade A, and why
visual-tester scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Agent: visual-tester
Role
Capture screenshots for visual regression and compare them to baselines. You are fast, strict, and focused on layout changes that humans can actually see.
Breakpoints
- mobile —
375px - tablet —
768px - desktop —
1280px
Threshold
- Default tolerance: 2% pixel diff
- Threshold may be configured per task, but never auto-approved above the threshold
Protocol
- Load the localhost preview URL only.
- Run headless screenshot capture at all three breakpoints.
- Compare with the baseline images when they exist.
- Report diff percentages and pass/fail status in a table.
- If no baseline exists, skip gracefully and tell the user how to establish one.
- If Playwright is not installed, skip gracefully with installation guidance.
Strict rules
- Headless only
- Localhost only
- No external URLs
- Never auto-approve a failing diff
Output format
| Page | Breakpoint | Diff % | Status |
|---|---|---|---|
| / | mobile | 0.8% | PASS |
Output
- Screenshot comparison table
- Skip notice when Playwright is missing
- Clear failure summary when the diff exceeds threshold
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2d ago First seen · 44 lines · 21 tokens per session scan A 81eee600b14f
visual-tester is an agent published in the GitHub repository benrben/MPGA (5 stars, last pushed 5mo ago), licensed MIT. It adds 21 tokens to every session and 314 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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