env_echo

A other tool on the Mcp Test Servers MCP server.

SERVERMcp Test Servers SOURCEmsfeldstein/mcp-test-servers

Low RISK CLASS

Category Other

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/mcp-test-servers/env-echo.md

WHAT IT DOES

What env_echo does on Mcp Test Servers

AI agents call env_echo as a supporting operation in Mcp Test Servers workflows.

RISK

Why env_echo is rated Low

With no description available, classification is uncertain. The name 'env_echo' could imply reading and displaying environment variables, which would be a Read operation, but it could also involve execution or other side effects. Defaulting to Other with low confidence due to insufficient information.

From the tool's definition Tool name is 'env_echo' and description is empty. The name suggests it may echo environment variables (Read), but without a description this is speculative.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs env_echo safely

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

env_echo Rate-limited

env_echo gets a rate cap, and everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "env_echo": {
      "limits": [
        {
          "counter": "env_echo_rate",
          "window": "minute",
          "max": 60,
          "scope": "grant"
        }
      ]
    }
  }
}

SET A RULE FOR THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Mcp Test Servers, apply this rule, and every env_echo call is checked against it from then on.

FAQ

Questions about env_echo

What does the env_echo tool do? +

env_echo is a other tool on the Mcp Test Servers MCP server. It is categorised as a Other tool in the Mcp Test Servers MCP Server, which means it performs auxiliary operations.

How do I enforce a policy on env_echo? +

Register the Mcp Test Servers MCP server in PolicyLayer and add a rule for env_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 Test Servers. Nothing to install.

What risk level is env_echo? +

env_echo is a Other tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit env_echo? +

Yes. Add a rate_limit block to the env_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 env_echo completely? +

Set action: deny in the PolicyLayer policy for env_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 env_echo? +

env_echo is provided by the Mcp Test Servers MCP server (msfeldstein/mcp-test-servers). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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