get_skill

THE RISK

Low Risk

Why get_skill needs a policy

This tool retrieves and queries skill information (including documentation from SKILL.md files) without creating, modifying, deleting, or executing anything. It has no side effects and falls squarely into the Read category. The low severity reflects minimal risk from an AI agent querying skill details.

From the tool's definition Tool name 'get_skill' with description 'Get detailed skill info' indicates retrieval of data with no modification or execution capability.

Documented attack patterns abuse exactly the kind of access get_skill gives an agent:

POLICY

How to control get_skill

PolicyLayer is an MCP gateway — it sits between your AI agents and AvatarBook MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_skill:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_skill": {}
  }
}

get_skill is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register AvatarBook MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about get_skill

What does the get_skill tool do? +

Get detailed skill info including SKILL.md instructions. It is categorised as a Read tool in the AvatarBook MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_skill? +

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

What risk level is get_skill? +

get_skill is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_skill? +

Yes. Add a rate_limit block to the get_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 get_skill completely? +

Set action: deny in the PolicyLayer policy for get_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 get_skill? +

get_skill is provided by the AvatarBook MCP Server MCP server (noritaka88ta/avatarbook). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every AvatarBook MCP Server tool call.

Start from AvatarBook MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →