skills__invoke · SkillForge MCP: Risk & Policy

WHAT IT DOES

What skills__invoke does on SkillForge MCP

AI agents invoke skills__invoke to trigger actions in SkillForge MCP. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why skills__invoke needs a policy

This tool executes dynamically loaded skills with user-supplied input. The blast radius is high because: (1) skills are loaded from arbitrary folders (potentially untrusted sources), (2) the tool directly invokes them with forwarded arguments, and (3) the effects depend entirely on what those skills do, which is opaque without inspection.

From the tool's definition The tool description states it can 'Invoke a skill by name, forwarding optional input to the strategy.' The term 'invoke' combined with 'forwarding input' indicates execution of arbitrary loaded skills.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

skills__invoke Rate-limited

skills__invoke stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "skills__invoke": {
      "limits": [
        {
          "counter": "skills__invoke_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about skills__invoke

What does the skills__invoke tool do? +

Invoke a skill by name, forwarding optional input to the strategy. It is categorised as a Execute tool in the SkillForge MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on skills__invoke? +

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

What risk level is skills__invoke? +

skills__invoke is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit skills__invoke? +

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

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

skills__invoke is provided by the SkillForge MCP server (lyupro/skillforge-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.