Send text-to-speech output to the operator interface. Use this for spoken alerts or short status updates that need immediate attention; prefer concise text because the content is voiced aloud. Returns a JSON confirmation with the spoken text, priority, and timestamp.
AI agents call sint__speak as a supporting operation in SINT Protocol workflows.
This tool sends audio/spoken notifications to a human operator interface. It does not read/query data, modify persistent data, execute code, delete anything, or move money. It is an outbound notification/alerting mechanism (text-to-speech), which is closest to 'Other' since it is a communication side-effect rather than a data operation.
From the tool's definition Send text-to-speech output to the operator interface... content is voiced aloud... Returns a JSON confirmation with the spoken text, priority, and timestamp
Documented attack patterns abuse exactly the kind of access sint__speak gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and SINT Protocol, and nothing reaches the server without passing your rules. This is the rule we recommend for sint__speak:
{
"version": "1",
"default": "deny",
"tools": {
"sint__speak": {
"limits": [
{
"counter": "sint__speak_rate",
"window": "minute",
"max": 60,
"scope": "grant"
}
]
}
}
}sint__speak gets a rate cap, and everything else on the server is denied unless you say otherwise.
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Send text-to-speech output to the operator interface. Use this for spoken alerts or short status updates that need immediate attention; prefer concise text because the content is voiced aloud. Returns a JSON confirmation with the spoken text, priority, and timestamp. It is categorised as a Other tool in the SINT Protocol MCP Server, which means it performs auxiliary operations.
Register the SINT Protocol MCP server in PolicyLayer and add a rule for sint__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 SINT Protocol. Nothing to install.
sint__speak is a Other tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the sint__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 sint__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.
sint__speak is provided by the SINT Protocol MCP server (sint-ai/sint-protocol). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from SINT Protocol, 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.
21 SINT Protocol tools catalogued and risk-classified — across an index of 43,000+ MCP servers.