# A11y Context MCP server

Agent View of the PolicyLayer registry record for A11y Context: identity, probed posture, risk grade, and all 3 tools classified. HTML page: https://policylayer.com/tools/a11y-context-mcp-server

## Facts

- Server id: `@a11y-context/mcp-server`
- Install: `npx -y @a11y-context/mcp-server`
- Homepage: https://www.npmjs.com/package/@a11y-context/mcp-server
- Registry record: grade A, identity unverified
- Lifecycle: active
- Rate-limited: no
- Tools: 3 (3 with introspected schema)
- Tool categories present: Read
- Context-window cost: 708 tokens per request — https://policylayer.com/token-cost/a11y-context-mcp-server
- Tags: a11y context mcp server
- Record last modified: 2026-09-17T17:53:43.535Z

## Tools (3)

| Tool | Category | Risk | Record |
| --- | --- | --- | --- |
| `get_foundations` | Read | Low | https://policylayer.com/tools/a11y-context-mcp-server/get-foundations.md |
| `get_pattern` | Read | Low | https://policylayer.com/tools/a11y-context-mcp-server/get-pattern.md |
| `list_patterns` | Read | Low | https://policylayer.com/tools/a11y-context-mcp-server/list-patterns.md |

## Tool descriptions

- `get_foundations` — Get the cross-cutting Foundations rules for a stack — accessibility requirements not tied to a single component: focus states, landmarks, headings, contrast, page structure, use of color. Retrieve these on every UI task, not just page-le…
- `get_pattern` — Get the full accessibility specification for one pattern by id (ids come from list_patterns). Returns the pattern's sections: must_haves (non-negotiable WCAG 2.2 AA requirements — implement all of them), donts (anti-patterns — never prod…
- `list_patterns` — List the accessible UI component patterns available for a stack. Call this FIRST whenever you are about to build or modify any UI, to choose which patterns apply. Each entry has an id, summary, tags, aliases, and a selection_excerpt (its…

## 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-context-mcp-server · API: https://policylayer.com/registry/api · Recommended policies for every tool: https://policylayer.com/policies/a11y-context-mcp-server