Synthesize speech with MiniMax TTS. Converts text into an audio file. If no output path is provided, the file is saved to the default output directory (e.g. ./mmx_speech).
AI agents use mmx_speech_synthesize to create or update resources in Mmx — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mmx environment.
This tool creates a new audio file by converting text to speech. It writes output to the filesystem. It does not delete or overwrite existing data irreversibly, execute arbitrary code, or involve financial transactions. The blast radius is medium because it consumes API quota and writes files to disk, but misuse is limited to generating unwanted audio files or consuming API credits.
From the tool's definition Synthesize speech with MiniMax TTS. Converts text into an audio file. If no output path is provided, the file is saved to the default output directory
Documented attack patterns abuse exactly the kind of access mmx_speech_synthesize gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mmx, and nothing reaches the server without passing your rules. This is the rule we recommend for mmx_speech_synthesize:
{
"version": "1",
"default": "deny",
"tools": {
"mmx_speech_synthesize": {
"limits": [
{
"counter": "mmx_speech_synthesize_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}mmx_speech_synthesize stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Synthesize speech with MiniMax TTS. Converts text into an audio file. If no output path is provided, the file is saved to the default output directory (e.g. ./mmx_speech). It is categorised as a Write tool in the Mmx MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Mmx MCP server in PolicyLayer and add a rule for mmx_speech_synthesize: 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 Mmx. Nothing to install.
mmx_speech_synthesize is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the mmx_speech_synthesize 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 mmx_speech_synthesize. 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.
mmx_speech_synthesize is provided by the Mmx MCP server (zth0828/mmx-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 8 Mmx tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
8 Mmx tools catalogued and risk-classified — across an index of 42,500+ MCP servers.