Borrowing it
Nothing to install: this file belongs to tomcounsell/ai. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/tomcounsell/ai/main/.claude/agents/frontend-tester.mdgit clone --depth 1 https://github.com/tomcounsell/aiWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/agents/tomcounsell/ai/frontend-tester)<a href="https://agentmods.dev/agents/tomcounsell/ai/frontend-tester"><img src="https://agentmods.dev/badge/agents/tomcounsell/ai/frontend-tester/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/agents/tomcounsell/ai/frontend-tester"><img src="https://agentmods.dev/badge/agents/tomcounsell/ai/frontend-tester.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What 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 5.1 | $0.00044 | $0.01072 |
| Opus 5 | $0.00022 | $0.00536 |
| Sonnet 5 | $0.00009 | $0.00214 |
| Haiku 4.5 | $0.00004 | $0.00107 |
Grade B, and why
frontend-tester scanned grade B with 1 finding 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 9d 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.
Unrestricted tool accessmediumExcessive agency
A wildcard tool grant or "run any command" leaves no least-privilege boundary at all.
tools: ['*'] The source is not reproduced here
Licensed GPL-3.0
The repository is licensed GPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.
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.
- 9d ago First seen · 118 lines · 44 tokens per session scan B a738a9bece3c
frontend-tester is an agent published in the GitHub repository tomcounsell/ai (24 stars, last pushed today), licensed GPL-3.0. It adds 44 tokens to every session and 1,072 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it B with 1 finding (unrestricted tool access). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other agents, from other repositories
qa-verifier
Use to independently verify a running frontend - drive key flows, assert ZERO browser console errors, run accessibility (WCAG AA) and Lighthouse checks, and confirm the UI matches DESIGN.md - then return a pass/fail report with evidence. Invoke before claiming a phase or the project "done".
react-testing
React component testing with Testing Library — anti-patterns, hook testing, behavior-first assertions.
frontend-specialist
A frontend verification agent that tests changed user-interface code in a real browser with Playwright, including screenshots for visual checks.
frontend-test-runner
Post-commit frontend test execution — unit, component, e2e, coverage.
frontend-tester
Frontend testing expert for comprehensive test coverage using Vitest, Playwright, and accessibility testing.
aem-fe-verifier
Verifies AEM component frontend rendering — creates/reuses demo pages, screenshots components in wcmmode=disabled via Playwright, compares against Figma reference or requirements using multimodal vision. Used by aem-fe-verify skill.