invoke_skill · Session Buddy MCP: Risk & Policy

WHAT IT DOES

What invoke_skill does on Session Buddy

AI agents invoke invoke_skill to trigger actions in Session Buddy. 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 invoke_skill needs a policy

The tool 'invokes' a skill, which implies triggering an operation or workflow. While 'get workflow guidance' sounds like a read/query operation, 'invoke' strongly suggests executing some action or process rather than merely reading data. The context of a session management server with skills suggests this could trigger automated workflows.

From the tool's definition Invoke a learned skill to get workflow guidance

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

invoke_skill Rate-limited

invoke_skill 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": {
    "invoke_skill": {
      "limits": [
        {
          "counter": "invoke_skill_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 Session Buddy, so you can run agents against it safely.

FAQ

Questions about invoke_skill

What does the invoke_skill tool do? +

Invoke a learned skill to get workflow guidance. It is categorised as a Execute tool in the Session Buddy MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on invoke_skill? +

Register the Session Buddy MCP server in PolicyLayer and add a rule for invoke_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 Session Buddy. Nothing to install.

What risk level is invoke_skill? +

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

Can I rate-limit invoke_skill? +

Yes. Add a rate_limit block to the invoke_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 invoke_skill completely? +

Set action: deny in the PolicyLayer policy for invoke_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 invoke_skill? +

invoke_skill is provided by the Session Buddy MCP server (lesleslie/session-buddy). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.