msg_respond_proposal · Agent Messaging MCP: Risk & Policy

WHAT IT DOES

What msg_respond_proposal does on Agent Messaging

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

WHY IT NEEDS A POLICY

Why msg_respond_proposal needs a policy

This tool modifies the state of a proposal (accepting, rejecting, or countering it), which is a reversible write operation affecting inter-agent negotiation workflows. While proposals could have downstream consequences, the tool itself is a state-change/response action rather than financial commitment, destructive deletion, or code execution.

From the tool's definition Accept, reject, or counter a proposal

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

msg_respond_proposal Rate-limited

msg_respond_proposal 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": {
    "msg_respond_proposal": {
      "limits": [
        {
          "counter": "msg_respond_proposal_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 Agent Messaging, so you can run agents against it safely.

FAQ

Questions about msg_respond_proposal

What does the msg_respond_proposal tool do? +

Accept, reject, or counter a proposal. It is categorised as a Write tool in the Agent Messaging MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on msg_respond_proposal? +

Register the Agent Messaging MCP server in PolicyLayer and add a rule for msg_respond_proposal: 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 Agent Messaging. Nothing to install.

What risk level is msg_respond_proposal? +

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

Can I rate-limit msg_respond_proposal? +

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

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

msg_respond_proposal is provided by the Agent Messaging MCP server (rumblingb/agent-messaging-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.