add_skill · Enhanced MCP Server MCP: Risk & Policy

WHAT IT DOES

What add_skill does on Enhanced MCP Server

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

WHY IT NEEDS A POLICY

Why add_skill needs a policy

This tool creates or modifies user profile information by adding a skill entry. It is reversible (skills can be removed or updated later) and has no side effects beyond data modification. The blast radius is minimal—adding a skill only affects the user's profile metadata. It does not execute external code, delete data, move money, or trigger destructive operations.

From the tool's definition Tool name 'add_skill' and description 'Add a skill to your profile' indicate creation/modification of profile data. The verb 'add' and the action of appending to a profile are characteristic of Write operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_skill Rate-limited

add_skill 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": {
    "add_skill": {
      "limits": [
        {
          "counter": "add_skill_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about add_skill

What does the add_skill tool do? +

Add a skill to your profile. It is categorised as a Write tool in the Enhanced MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add_skill? +

Register the Enhanced MCP Server MCP server in PolicyLayer and add a rule for add_skill: 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 Enhanced MCP Server. Nothing to install.

What risk level is add_skill? +

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

Can I rate-limit add_skill? +

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

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

add_skill is provided by the Enhanced MCP Server MCP server (pbulbule13/mcpwithgoogle). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.