web_accessibility_audit
AI agents call web_accessibility_audit to retrieve information from Fourth Playwright MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
An accessibility audit typically reads and analyzes page structure without side effects. However, given the server context includes browser automation and JS execution siblings, there's some chance this tool could trigger actions. The empty description lowers confidence significantly. Defaulting to Read as the most likely category for an audit tool, with medium severity due to the browser automation context.
From the tool's definition Tool name 'web_accessibility_audit' suggests reading/auditing accessibility properties of a page; description is empty and uninformative.
Attacks that exploit this kind of access
web_accessibility_audit. It is categorised as a Read tool in the Fourth Playwright MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Fourth Playwright MCP Server MCP server in PolicyLayer and add a rule for web_accessibility_audit: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Fourth Playwright MCP Server. Nothing to install.
web_accessibility_audit is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the web_accessibility_audit rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for web_accessibility_audit. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
web_accessibility_audit is provided by the Fourth Playwright MCP Server MCP server (rev4nchist/fourth-playwright-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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