Echo any message back (perfect for testing)
AI agents call echo to retrieve information from Custom MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a testing/utility tool that performs no operations beyond reflecting back the caller's input. It does not retrieve, modify, delete, or execute any external operations. The primary purpose is diagnostic and poses minimal security risk, categorizing it as Read with low severity.
From the tool's definition Tool name 'echo' and description 'Echo any message back (perfect for testing)' indicates it simply returns input without modification, side effects, or data retrieval from external sources.
Attacks that exploit this kind of access
Echo any message back (perfect for testing). It is categorised as a Read tool in the Custom MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Custom 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 Custom 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 Custom MCP Server MCP server (meerisha/custom-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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