# use_skill

Use a skill by its name.

Agent View of the PolicyLayer registry record for `use_skill`. HTML page: https://policylayer.com/tools/firebase-genkit/use-skill

## Facts

- Tool: `use_skill`
- Server: Genkit MCP (`genkit-ai/genkit`) — https://policylayer.com/tools/firebase-genkit.md
- Homepage: https://github.com/genkit-ai/genkit
- Risk category: Execute (High risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Rate-limited

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "use_skill",
    "arguments": {}
  }
}
```

## Why use_skill is rated High

The tool executes a named skill, which implies running some operation or capability. The exact nature of what 'skills' do is unknown from the description alone, but invoking arbitrary named operations suggests Execute category. The severity is high because a misconfigured or malicious skill invocation could have significant side effects.

From the tool's own definition: "'Use a skill by its name' - executes a named skill/capability"

## Use case

AI agents invoke use_skill to trigger actions in Genkit 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.

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Genkit MCP:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "use_skill": {
      "limits": [
        {
          "counter": "use_skill_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on Genkit MCP (71)

- `removeTask` — Destructive — https://policylayer.com/tools/firebase-genkit/removetask.md
- `characterGenerator` — Execute — https://policylayer.com/tools/firebase-genkit/charactergenerator.md
- `delegate_to_coder` — Execute — https://policylayer.com/tools/firebase-genkit/delegate-to-coder.md
- `delegate_to_researcher` — Execute — https://policylayer.com/tools/firebase-genkit/delegate-to-researcher.md
- `run_flow` — Execute — https://policylayer.com/tools/firebase-genkit/run-flow.md
- `run_shell` — Execute — https://policylayer.com/tools/firebase-genkit/run-shell.md
- `screenshot` — Execute — https://policylayer.com/tools/firebase-genkit/screenshot.md
- `slowWork` — Execute — https://policylayer.com/tools/firebase-genkit/slowwork.md
- `start_runtime` — Execute — https://policylayer.com/tools/firebase-genkit/start-runtime.md
- `transferToAgent` — Execute — https://policylayer.com/tools/firebase-genkit/transfertoagent.md
- `processPayment` — Financial — https://policylayer.com/tools/firebase-genkit/processpayment.md
- `request_transfer` — Financial — https://policylayer.com/tools/firebase-genkit/request-transfer.md
- `reservationTool` — Financial — https://policylayer.com/tools/firebase-genkit/reservationtool.md
- `transferMoney` — Financial — https://policylayer.com/tools/firebase-genkit/transfermoney.md
- `add` — Other — https://policylayer.com/tools/firebase-genkit/add.md
- `askQuestion` — Other — https://policylayer.com/tools/firebase-genkit/askquestion.md
- `datePicker` — Other — https://policylayer.com/tools/firebase-genkit/datepicker.md
- `error_tool` — Other — https://policylayer.com/tools/firebase-genkit/error-tool.md
- `exitTool` — Other — https://policylayer.com/tools/firebase-genkit/exittool.md
- `gablorken` — Other — https://policylayer.com/tools/firebase-genkit/gablorken.md
- `test_http` — Other — https://policylayer.com/tools/firebase-genkit/test-http.md
- `account_record` — Read — https://policylayer.com/tools/firebase-genkit/account-record.md
- `ask_user` — Read — https://policylayer.com/tools/firebase-genkit/ask-user.md
- `celsiusToFahrenheit` — Read — https://policylayer.com/tools/firebase-genkit/celsiustofahrenheit.md
- `confirmBooking` — Read — https://policylayer.com/tools/firebase-genkit/confirmbooking.md
- `current_weather` — Read — https://policylayer.com/tools/firebase-genkit/current-weather.md
- `dailySpecial` — Read — https://policylayer.com/tools/firebase-genkit/dailyspecial.md
- `dynamicGablorkenTool` — Read — https://policylayer.com/tools/firebase-genkit/dynamicgablorkentool.md
- `echo_meta_tool` — Read — https://policylayer.com/tools/firebase-genkit/echo-meta-tool.md
- `fetchCatalog` — Read — https://policylayer.com/tools/firebase-genkit/fetchcatalog.md
- …and 41 more: https://policylayer.com/tools/firebase-genkit.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=firebase-genkit · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/firebase-genkit