入力されたメッセージをそのまま返します
AI agents call echo to retrieve information from Playwright MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool merely reflects back what is provided to it without retrieving external data, modifying anything, executing commands, or triggering external operations. It is a diagnostic or test utility with no capability to affect state. While part of a Playwright browser automation server, this specific tool performs no browser interactions. Severity is low because even if invoked, it cannot cause harm.
From the tool's definition Tool description states it returns the input message as-is ('echoes' it back). This is a simple echo/passthrough operation with no side effects on any system or data.
Attacks that exploit this kind of access
入力されたメッセージをそのまま返します. It is categorised as a Read tool in the Playwright MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Playwright MCP Server MCP server in PolicyLayer and add a rule for echo: 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 Playwright MCP Server. Nothing to install.
echo 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 echo 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 echo. 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.
echo is provided by the Playwright MCP Server MCP server (kotelberg/playwright-mcp-server). 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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