Echo back a message with optional formatting.
AI agents call echo_message to retrieve information from MCP Echo Service without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The echo_message tool retrieves and returns the user-provided message with optional formatting applied. It has no persistent side effects, does not modify external state, and does not execute commands or delete data. It is purely informational and falls squarely into the Read category.
From the tool's definition Tool description states 'Echo back a message with optional formatting.' This is a reflective operation that returns input data without modification, storage, or side effects.
Attacks that exploit this kind of access
Echo back a message with optional formatting. It is categorised as a Read tool in the MCP Echo Service MCP Server, which means it retrieves data without modifying state.
Register the MCP Echo Service MCP server in PolicyLayer and add a rule for echo_message: 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 MCP Echo Service. Nothing to install.
echo_message 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_message 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_message. 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_message is provided by the MCP Echo Service MCP server (nimblebraininc/mcp-echo). 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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