happy_wait_for_idle · Happy Server MCP: Risk & Policy

WHAT IT DOES

What happy_wait_for_idle does on Happy Server MCP

AI agents invoke happy_wait_for_idle to trigger actions in Happy Server MCP. 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 happy_wait_for_idle needs a policy

This tool monitors and synchronizes with an external AI session's execution state. While it does not directly modify data (not Write/Destructive) or move money (not Financial), it exercises control over an executing system by blocking until a condition is met. This is characteristic of Execute-category tools that trigger or orchestrate external operations.

From the tool's definition Tool 'happy_wait_for_idle' performs a blocking operation on an external Happy AI session to wait for state changes.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

happy_wait_for_idle Rate-limited

happy_wait_for_idle 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": {
    "happy_wait_for_idle": {
      "limits": [
        {
          "counter": "happy_wait_for_idle_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 Happy Server MCP, so you can run agents against it safely.

FAQ

Questions about happy_wait_for_idle

What does the happy_wait_for_idle tool do? +

Wait for a Happy AI session to become idle (finish processing). Useful after sending a message to wait for AI to complete its work. It is categorised as a Execute tool in the Happy Server MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on happy_wait_for_idle? +

Register the Happy Server MCP server in PolicyLayer and add a rule for happy_wait_for_idle: 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 Happy Server MCP. Nothing to install.

What risk level is happy_wait_for_idle? +

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

Can I rate-limit happy_wait_for_idle? +

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

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

happy_wait_for_idle is provided by the Happy Server MCP server (zhigang1992/happy-server-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.