AI agents call echo to retrieve information from MCP Firebird without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a trivial utility function that returns the input unchanged. It performs no database operations, does not query or modify data, does not execute code, and has no destructive or financial implications. It falls into the Read category as the least harmful classification (or could arguably be 'Other', but Read is appropriate as it only reflects information back).
From the tool's definition Tool name 'echo' with description 'Echoes back the input message' indicates a simple reflection/output of user input with no data access, modification, or side effects.
Documented attack patterns abuse exactly the kind of access echo gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MCP Firebird, and nothing reaches the server without passing your rules. This is the rule we recommend for echo:
{
"version": "1",
"default": "deny",
"tools": {
"echo": {}
}
}echo is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Echoes back the input message. It is categorised as a Read tool in the MCP Firebird MCP Server, which means it retrieves data without modifying state.
Register the MCP Firebird 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 MCP Firebird. 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 MCP Firebird MCP server (purodelphi/mcpfirebird). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 22 MCP Firebird tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
22 MCP Firebird tools catalogued and risk-classified — across an index of 42,500+ MCP servers.