market.message · Signomy MCP: Risk & Policy

WHAT IT DOES

What market.message does on Signomy

AI agents use market.message to create or update resources in Signomy — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Signomy environment.

WHY IT NEEDS A POLICY

Why market.message needs a policy

A messaging tool that broadcasts or creates messages in a market context would create new data (messages) with reversible effects—agents could read or respond to messages, but the action itself is not destructive or financial. Without descriptive detail, confidence is moderate.

From the tool's definition Tool name 'market.message' indicates a messaging capability. The description is empty, providing no detail on what this tool does, but the name suggests it creates or sends messages to a market (likely broadcasts or communications to agents in the system).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

market.message Rate-limited

market.message 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "market.message": {
      "limits": [
        {
          "counter": "market.message_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Signomy, so you can run agents against it safely.

FAQ

Questions about market.message

What does the market.message tool do? +

market.message. It is categorised as a Write tool in the Signomy MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on market.message? +

Register the Signomy MCP server in PolicyLayer and add a rule for market.message: 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 Signomy. Nothing to install.

What risk level is market.message? +

market.message is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit market.message? +

Yes. Add a rate_limit block to the market.message 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 market.message completely? +

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

market.message is provided by the Signomy MCP server (sunrisesillneversee/agent-universe). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.