export_skill · PromStack MCP Server MCP: Risk & Policy

WHAT IT DOES

What export_skill does on PromStack MCP Server

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

WHY IT NEEDS A POLICY

Why export_skill needs a policy

Exporting prompts as Claude Skills is a write operation that creates new data/artifacts in a system (likely Claude's skill registry or files). While reversible (Skills can be deleted), it modifies system state by introducing new executable code structures. This is less severe than Execute (doesn't directly run code) but more than Read.

From the tool's definition Tool name 'export_skill' combined with server description stating it enables 'exporting prompts as Claude Skills' indicates the tool creates or outputs data artifacts (Skills). The empty description limits certainty.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

export_skill Rate-limited

export_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": {
    "export_skill": {
      "limits": [
        {
          "counter": "export_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 PromStack MCP Server, so you can run agents against it safely.

FAQ

Questions about export_skill

What does the export_skill tool do? +

export_skill. It is categorised as a Write tool in the PromStack 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 export_skill? +

Register the PromStack MCP Server MCP server in PolicyLayer and add a rule for export_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 PromStack MCP Server. Nothing to install.

What risk level is export_skill? +

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

Can I rate-limit export_skill? +

Yes. Add a rate_limit block to the export_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 export_skill completely? +

Set action: deny in the PolicyLayer policy for export_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 export_skill? +

export_skill is provided by the PromStack MCP Server MCP server (promstack-1/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.