echo

Return text unchanged.

SERVERAgent Reliability Lab SOURCEAndrem19/agent-reliability-lab

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade D, identity unverified Pull the record →

This record as markdown: /tools/agent-reliability-lab/echo.md

WHAT IT DOES

What echo does on Agent Reliability Lab

AI agents use echo to create or update resources in Agent Reliability Lab, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Agent Reliability Lab environment.

RISK

Why echo is rated Medium

An AI agent can call echo faster than any human can review: one bad instruction and it creates or modifies resources in Agent Reliability Lab by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs echo safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Agent Reliability Lab, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For echo, this is the rule to start with:

echo Rate-limited

echo stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "echo": {
      "limits": [
        {
          "counter": "echo_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Agent Reliability Lab, apply this rule, and every echo call is checked against it from then on.

FAQ

Questions about echo

What does the echo tool do? +

Return text unchanged. It is categorised as a Write tool in the Agent Reliability Lab MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on echo? +

Register the Agent Reliability Lab 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 Agent Reliability Lab. Nothing to install.

What risk level is echo? +

echo is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit echo? +

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.

How do I block echo completely? +

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.

What MCP server provides echo? +

echo is provided by the Agent Reliability Lab MCP server (Andrem19/agent-reliability-lab). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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Guides

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