add_skill · Prompts MCP: Risk & Policy

WHAT IT DOES

What add_skill does on Prompts

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

WHY IT NEEDS A POLICY

Why add_skill needs a policy

The tool creates new skill objects within the prompts management system and allows customization of attributes like identity and development standards. This is a Write operation—it creates and modifies configuration data persistently, but does not execute external code, delete data, or move money. The impact is reversible through normal update/delete operations, making it Write rather than Execute or Destructive.

From the tool's definition Tool name 'add_skill' and description '【创建技能】创建一个新的角色技能。可自定义身份、开发规范等' (Create skill / Create a new role skill. Can customize identity, development norms, etc.) indicates creation of new data entities with customizable attributes.

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 Prompts, so you can run agents against it safely.

FAQ

Questions about add_skill

What does the add_skill tool do? +

【创建技能】创建一个新的角色技能。可自定义身份、开发规范等。. It is categorised as a Write tool in the Prompts 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 Prompts 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 Prompts. 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 Prompts MCP server (thana0623/pmcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.