browser_snapshot
Capture accessibility snapshot of the current page, this is better than screenshot
This record as markdown: /tools/a11y-agent-skills/browser-snapshot.md
What browser_snapshot does on A11y Agent Skills
AI agents call browser_snapshot to retrieve information from A11y Agent Skills without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why browser_snapshot is rated Low
This tool only captures and returns information about the current browser page state. It is a read-only operation with no side effects, no data modification, and no execution of code or external operations. The risk of misuse is minimal: even if an AI agent calls it repeatedly or in unintended contexts, it simply extracts information that is already visible or accessible on the page.
From the tool's definition The tool 'browser_snapshot' is described as 'Capture accessibility snapshot of the current page' — it retrieves and returns data about the page state without modifying it or triggering external actions.
Attacks that exploit this kind of access
The rule that runs browser_snapshot safely
PolicyLayer is an MCP gateway: it sits between your AI agents and A11y Agent Skills, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For browser_snapshot, this is the rule to start with:
browser_snapshot is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect A11y Agent Skills, apply this rule, and every browser_snapshot call is checked against it from then on.
Questions about browser_snapshot
Capture accessibility snapshot of the current page, this is better than screenshot. It is categorised as a Read tool in the A11y Agent Skills MCP Server, which means it retrieves data without modifying state.
Register the A11y Agent Skills MCP server in PolicyLayer and add a rule for browser_snapshot: 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 A11y Agent Skills. Nothing to install.
browser_snapshot 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 browser_snapshot 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 browser_snapshot. 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.
browser_snapshot is provided by the A11y Agent Skills MCP server (smukh/a11y-agent-skills). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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