send_message_to_agent

WHAT IT DOES

What send_message_to_agent does on Claude Code MCP - Agent Orchestration Platform

AI agents invoke send_message_to_agent to trigger actions in Claude Code MCP - Agent Orchestration Platform. 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.

WHY IT NEEDS A POLICY

Why send_message_to_agent needs a policy

This tool sends messages to AI agents with automatic prompt injection, which can cause those agents to execute arbitrary code, modify files, run shell commands, or perform other operations across multiple codebases. The 'automatic ADDER+ prompt injection' suggests the tool modifies/augments the message before sending, amplifying potential impact.

From the tool's definition 'Send message to agent with automatic ADDER+ prompt injection and coordination' — triggers execution of an AI agent with injected prompts, causing external operations whose effects depend on the message content

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

send_message_to_agent Rate-limited

send_message_to_agent 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "send_message_to_agent": {
      "limits": [
        {
          "counter": "send_message_to_agent_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Claude Code MCP - Agent Orchestration Platform, so you can run agents against it safely.

FAQ

Questions about send_message_to_agent

What does the send_message_to_agent tool do? +

Send message to agent with automatic ADDER+ prompt injection and coordination. It is categorised as a Execute tool in the Claude Code MCP - Agent Orchestration Platform MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on send_message_to_agent? +

Register the Claude Code MCP - Agent Orchestration Platform MCP server in PolicyLayer and add a rule for send_message_to_agent: 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 Claude Code MCP - Agent Orchestration Platform. Nothing to install.

What risk level is send_message_to_agent? +

send_message_to_agent is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit send_message_to_agent? +

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

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

send_message_to_agent is provided by the Claude Code MCP - Agent Orchestration Platform MCP server (nexus-digital-automations/claude_code_mcp_2). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.