AI agents invoke speak to trigger actions in Reachy Mini 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.
The tool likely triggers text-to-speech audio output on a physical robot, which is an external operation/action rather than a simple data read or write. The description is empty, so confidence is reduced. Based on the server context (TTS capabilities, physical robot control), 'speak' most plausibly executes an audio output action on the robot hardware.
From the tool's definition Tool name 'speak' on a server described as enabling 'text-to-speech capabilities' for a physical robot; sibling tools include 'listen', 'look', 'snap', 'show' suggesting sensory/output actions
Documented attack patterns abuse exactly the kind of access speak gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Reachy Mini MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for speak:
{
"version": "1",
"default": "deny",
"tools": {
"speak": {
"limits": [
{
"counter": "speak_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}speak 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.
Free to start. No card required.
speak. It is categorised as a Execute tool in the Reachy Mini MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Reachy Mini MCP server in PolicyLayer and add a rule for speak: 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 Mini MCP. Nothing to install.
speak is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the speak 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.
Set action: deny in the PolicyLayer policy for speak. 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.
speak is provided by the Reachy Mini MCP server (jackccrawford/reachy-mini-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Reachy Mini MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
7 Reachy Mini MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.