robot_emotion · Reachy Claude MCP: Risk & Policy

WHAT IT DOES

What robot_emotion does on Reachy Claude MCP

AI agents invoke robot_emotion to trigger actions in Reachy Claude 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.

WHY IT NEEDS A POLICY

Why robot_emotion needs a policy

This tool triggers an external physical operation on a robot (or its simulation) — causing it to perform an animation. This is an Execute-category action because it runs a physical/external operation whose effect depends on the argument (which emotion to play). It does not merely read data, nor does it irreversibly destroy anything, but it does actuate a real or simulated robot.

From the tool's definition Play an emotion animation without speaking

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

robot_emotion Rate-limited

robot_emotion 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": {
    "robot_emotion": {
      "limits": [
        {
          "counter": "robot_emotion_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 Reachy Claude MCP, so you can run agents against it safely.

FAQ

Questions about robot_emotion

What does the robot_emotion tool do? +

Play an emotion animation without speaking. It is categorised as a Execute tool in the Reachy Claude MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on robot_emotion? +

Register the Reachy Claude MCP server in PolicyLayer and add a rule for robot_emotion: 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 Reachy Claude MCP. Nothing to install.

What risk level is robot_emotion? +

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

Can I rate-limit robot_emotion? +

Yes. Add a rate_limit block to the robot_emotion 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 robot_emotion completely? +

Set action: deny in the PolicyLayer policy for robot_emotion. 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 robot_emotion? +

robot_emotion is provided by the Reachy Claude MCP server (mchardysam/reachy-claude-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.