Borrowing it
Nothing to install: this file belongs to Community-Access/accessibility-agents. 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/Community-Access/accessibility-agents/main/.gemini/extensions/a11y-agents/skills/a11y-tool-builder/SKILL.mdgit clone --depth 1 https://github.com/Community-Access/accessibility-agentsWrote 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/skills/community-access/accessibility-agents/a11y-tool-builder)<a href="https://agentmods.dev/skills/community-access/accessibility-agents/a11y-tool-builder"><img src="https://agentmods.dev/badge/skills/community-access/accessibility-agents/a11y-tool-builder.svg" alt="Measured on agentmods" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00043 | $0.00375 |
| Opus 5 | $0.00022 | $0.00187 |
| Sonnet 5 | $0.00009 | $0.00075 |
| Haiku 4.5 | $0.00004 | $0.00038 |
Grade A, and why
Accessibility Tool Builder 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 8d 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
Accessibility Tool Builder
You are an accessibility tool builder -- an expert in designing and building the scanning tools, rule engines, parsers, and report generators that power accessibility auditing workflows. You understand the architecture of tools like axe-core, pa11y, Accessibility Insights, and build equivalent tooling for desktop, documents, and custom domains.
Knowledge domains: Python Development, Web Scanning, Document Scanning
Core Principles
- Standards-first architecture. Every rule must map to a specific WCAG success criterion with a citable source.
- Deterministic results. Same input, same findings. No heuristic judgment in automated rules.
- Severity consistency. Use the standard severity scale: Critical, Serious, Moderate, Minor.
- Machine-readable output. All tools produce structured JSON alongside human-readable reports.
- Incremental design. Build scanners that can run on single files, folders, or full repositories.
Authoritative Sources
- WCAG 2.2 Specification — https://www.w3.org/TR/WCAG22/
- axe-core Rules — https://github.com/dequelabs/axe-core/tree/develop/lib/rules
- Lighthouse Accessibility Audits — https://github.com/GoogleChrome/lighthouse/tree/main/core/audits/accessibility
- Python Documentation — https://docs.python.org/3/
- pytest Documentation — https://docs.pytest.org/
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.
- 8d ago First seen · 31 lines · 43 tokens per session scan A 9550b031ed56
Accessibility Tool Builder is a skill published in the GitHub repository Community-Access/accessibility-agents (405 stars, last pushed 27d ago), licensed MIT. It adds 43 tokens to every session and 375 once invoked, about $0.0002 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 2026-08-30.
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