log-to-stderr

A read tool on the Mcp Test Servers MCP server.

SERVERMcp Test Servers SOURCEmsfeldstein/mcp-test-servers

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/mcp-test-servers/log-to-stderr.md

WHAT IT DOES

What log-to-stderr does on Mcp Test Servers

AI agents call log-to-stderr to retrieve information from Mcp Test Servers without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why log-to-stderr is rated Low

Even though log-to-stderr only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs log-to-stderr 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 log-to-stderr, this is the rule to start with:

log-to-stderr Allowed

log-to-stderr is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "log-to-stderr": {}
  }
}

ALLOW ONLY 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 log-to-stderr call is checked against it from then on.

FAQ

Questions about log-to-stderr

What does the log-to-stderr tool do? +

log-to-stderr is a read tool on the Mcp Test Servers MCP server. It is categorised as a Read tool in the Mcp Test Servers MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on log-to-stderr? +

Register the Mcp Test Servers MCP server in PolicyLayer and add a rule for log-to-stderr: 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 log-to-stderr? +

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

Can I rate-limit log-to-stderr? +

Yes. Add a rate_limit block to the log-to-stderr 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 log-to-stderr completely? +

Set action: deny in the PolicyLayer policy for log-to-stderr. 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 log-to-stderr? +

log-to-stderr 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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