# 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.

Agent View of the PolicyLayer registry record for `audit_html`. HTML page: https://policylayer.com/tools/a11y-assist-mcp/audit-html

## Facts

- Tool: `audit_html`
- Server: A11y Assist (`a11y-assist-mcp`) — https://policylayer.com/tools/a11y-assist-mcp.md
- Install: `npx -y a11y-assist-mcp`
- Homepage: https://www.npmjs.com/package/a11y-assist-mcp
- Risk category: Execute (High risk)
- Registry record: grade D, identity unverified
- Server rate-limited: no
- Parameters: 2 (1 required)
- Recommended policy verdict: Rate-limited

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `html` | string | yes | HTML approximation of what the component renders. Can be a snippet — it will be wrapped in <html><body>...</body></html> automatically. |
| `stylesheetPath` | string | no | Optional absolute path to a CSS file to inline (for realistic computed styles — e.g. contrast and focus indicator checks). |

Parameters from the server's own tool schema.

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "audit_html",
    "arguments": {
      "html": "<html>"
    }
  }
}
```

## Why audit_html is rated High

audit_html triggers real processes with real consequences. An agent gone sideways doesn't fire it once. It starts dozens of builds, sends mass notifications, or burns through compute before anyone looks up.

Risk signals: Accepts raw HTML/template content (html)

## Use case

AI agents invoke audit_html to trigger actions in A11y Assist. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches A11y Assist:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "audit_html": {
      "limits": [
        {
          "counter": "audit_html_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on A11y Assist (11)

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

## 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`

---

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 · Policy library: https://policylayer.com/policies/a11y-assist-mcp