spin · ChimeraX MCP Server MCP: Risk & Policy

WHAT IT DOES

What spin does on ChimeraX MCP Server

AI agents invoke spin to trigger actions in ChimeraX MCP Server. 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 spin needs a policy

This tool triggers an external operation in ChimeraX to rotate/animate the model view. It doesn't read data, write/modify stored data, destroy data, or move money — it executes a visual/interactive command in the ChimeraX application. The blast radius is low since it only affects the visualization state.

From the tool's definition Spin/rotate the model around an axis (x, y, or z)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

spin Rate-limited

spin 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": {
    "spin": {
      "limits": [
        {
          "counter": "spin_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 ChimeraX MCP Server, so you can run agents against it safely.

FAQ

Questions about spin

What does the spin tool do? +

Spin/rotate the model around an axis (x, y, or z). It is categorised as a Execute tool in the ChimeraX MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on spin? +

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

What risk level is spin? +

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

Can I rate-limit spin? +

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

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

spin is provided by the ChimeraX MCP Server MCP server (mahynotch/chimerax-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.