# A11y Assist MCP server

Agent View of the PolicyLayer registry record for A11y Assist: identity, probed posture, risk grade, and all 12 tools classified. HTML page: https://policylayer.com/tools/a11y-assist-mcp

## Facts

- Server id: `a11y-assist-mcp`
- Install: `npx -y a11y-assist-mcp`
- Homepage: https://www.npmjs.com/package/a11y-assist-mcp
- Registry record: grade D, identity unverified
- Lifecycle: active
- Rate-limited: no
- Tools: 12 (11 with introspected schema)
- Tool categories present: Execute, Read, Write
- Context-window cost: 2569 tokens per request — https://policylayer.com/token-cost/a11y-assist-mcp
- Tags: a11y assist mcp, automation
- Record last modified: 2026-10-12T19:35:01.120Z

## Tools (12)

| Tool | Category | Risk | Record |
| --- | --- | --- | --- |
| `audit_html` | Execute | High | https://policylayer.com/tools/a11y-assist-mcp/audit-html.md |
| `audit_url` | Execute | High | https://policylayer.com/tools/a11y-assist-mcp/audit-url.md |
| `evaluate_verification` | Read | Low | https://policylayer.com/tools/a11y-assist-mcp/evaluate-verification.md |
| `get_act_rule` | Read | Low | https://policylayer.com/tools/a11y-assist-mcp/get-act-rule.md |
| `get_apg_pattern` | Read | Low | https://policylayer.com/tools/a11y-assist-mcp/get-apg-pattern.md |
| `get_aria_role` | Read | Low | https://policylayer.com/tools/a11y-assist-mcp/get-aria-role.md |
| `get_element_roles` | Read | Low | https://policylayer.com/tools/a11y-assist-mcp/get-element-roles.md |
| `get_wcag_sc` | Read | Low | https://policylayer.com/tools/a11y-assist-mcp/get-wcag-sc.md |
| `list_apg_patterns` | Read | Low | https://policylayer.com/tools/a11y-assist-mcp/list-apg-patterns.md |
| `search_act` | Read | Low | https://policylayer.com/tools/a11y-assist-mcp/search-act.md |
| `search_wcag` | Read | Low | https://policylayer.com/tools/a11y-assist-mcp/search-wcag.md |
| `evaluate_applicability` | Write | Medium | https://policylayer.com/tools/a11y-assist-mcp/evaluate-applicability.md |

## Tool descriptions

- `audit_html` — Run accessibility checks against an HTML snippet using axe-core (WCAG AA). No dev server or Storybook required. Limitation: cannot evaluate dynamic behaviour (focus management, route changes, live region timing) — use audit_url for those.
- `audit_url` — Run accessibility checks against a live URL. Catches dynamic behaviour (focus management, transitions, live regions) that audit_html cannot. NOTE: it drives a fresh headless browser with no app state — for routes that depend on localStor…
- `evaluate_verification` — Roll up a per-SC verification verdict from the checks you have resolved. Pass the verification predicate ids you confirmed as pass and fail; anything unresolved stays UNVERIFIED — never assumed to pass. Returns pass / fail / unverified p…
- `get_act_rule` — Return the full verbatim ACT rule by id — name, description, applicability text, covered WCAG SC ids, input aspects, and canonical url.
- `get_apg_pattern` — ENTRY POINT for building a composite component. Returns the verbatim W3C APG card (about, keyboard interactions, examples), the ARIA contract for its roles, the native HTML elements that carry them, and suggested_queries (ACT searches) t…
- `get_aria_role` — ENTRY POINT for working on a native primitive / small element. Returns the ARIA contract for the role (required/supported props, name source), the native HTML elements that carry it, and suggested_queries (ACT searches) to run next. Also…
- `get_element_roles` — Resolve an HTML element (tag + attributes) to the ARIA role(s) it implicitly carries — verbatim from aria-query (ARIA in HTML). Use this when you have markup and want the role, then pass that role to get_aria_role.
- `get_wcag_sc` — Return a WCAG 2.2 Success Criterion in full: its verbatim statement plus its sufficient techniques and documented failures (the W3C-published anti-patterns). Explicit by-id fetch — not level-gated.
- `list_apg_patterns` — List the W3C APG pattern names available as entry points for get_apg_pattern (composite components). Native primitives are not listed here — reach those via get_aria_role / get_element_roles.
- `search_act` — DRILL-DOWN hub. Search ACT conformance-test rules and get the WCAG Success Criteria they cover (the one mechanical ACT→SC bridge), gated to your level. Feed it the terms from an entry point's suggested_queries. Then call get_wcag_sc on t…
- `search_wcag` — Search WCAG Success Criteria by keyword, gated to a conformance level. Returns id / level / title. Use get_wcag_sc for the full SC with techniques and failures. (Most drill-down flows reach SCs via search_act; use this for direct keyword…
- `evaluate_applicability` — REFINE the applicable WCAG criteria for a component beyond the structural floor that get_apg_pattern / get_aria_role return. Gate-first walkthrough — the same engine the website uses — that prunes the question set to only what your compo…

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## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

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Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=a11y-assist-mcp · API: https://policylayer.com/registry/api · Recommended policies for every tool: https://policylayer.com/policies/a11y-assist-mcp