write_template_library · Todos MCP: Risk & Policy

WHAT IT DOES

What write_template_library does on Todos

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

WHY IT NEEDS A POLICY

Why write_template_library needs a policy

This tool creates or modifies JSON files by writing template library data to the filesystem. While reversible (files can be edited or deleted), it alters stored data and could overwrite existing template configurations. The impact is contained to local template files rather than critical system data, justifying 'Write' category with medium severity.

From the tool's definition Tool name contains 'write' and description states 'Write the bundled local template library to editable JSON files', indicating data creation/modification operations that persist to disk.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

write_template_library Rate-limited

write_template_library 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": {
    "write_template_library": {
      "limits": [
        {
          "counter": "write_template_library_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Todos, so you can run agents against it safely.

FAQ

Questions about write_template_library

What does the write_template_library tool do? +

Write the bundled local template library to editable JSON files for review or import. It is categorised as a Write tool in the Todos MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on write_template_library? +

Register the Todos MCP server in PolicyLayer and add a rule for write_template_library: 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 Todos. Nothing to install.

What risk level is write_template_library? +

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

Can I rate-limit write_template_library? +

Yes. Add a rate_limit block to the write_template_library 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 write_template_library completely? +

Set action: deny in the PolicyLayer policy for write_template_library. 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 write_template_library? +

write_template_library is provided by the Todos MCP server (@hasna/todos). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.