take_snapshot · ChimeraX MCP Server MCP: Risk & Policy

WHAT IT DOES

What take_snapshot does on ChimeraX MCP Server

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

WHY IT NEEDS A POLICY

Why take_snapshot needs a policy

This tool writes a PNG image file to disk. It creates new data (a file) but does not delete or overwrite existing structures, execute arbitrary code, or have financial implications. It is a reversible write operation with low blast radius.

From the tool's definition Save a PNG screenshot of the current view

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

take_snapshot Rate-limited

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

FAQ

Questions about take_snapshot

What does the take_snapshot tool do? +

Save a PNG screenshot of the current view. It is categorised as a Write tool in the ChimeraX MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on take_snapshot? +

Register the ChimeraX MCP Server MCP server in PolicyLayer and add a rule for take_snapshot: 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 take_snapshot? +

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

Can I rate-limit take_snapshot? +

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

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

take_snapshot 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.