poll_error_endpoint_and_fix

THE RISK

High Risk

Why poll_error_endpoint_and_fix needs a policy

The tool spans Read and Execute/Write categories. Fetching the error report is a Read action, but automatically fixing protocols constitutes executing changes to protocol definitions on the robot. Since fixing protocols modifies operational behavior of a physical robot system and the action is automated/triggered, Execute is the most appropriate category.

From the tool's definition 'automatically fix protocols' — the tool not only fetches error data (Read) but also automatically applies fixes to protocols, triggering external operations on the robot system

Documented attack patterns abuse exactly the kind of access poll_error_endpoint_and_fix gives an agent:

POLICY

How to control poll_error_endpoint_and_fix

PolicyLayer is an MCP gateway — it sits between your AI agents and Opentrons MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for poll_error_endpoint_and_fix:

policy.json

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

poll_error_endpoint_and_fix 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.

Create a free account and register Opentrons MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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Execute control_run Control run execution (play, pause, stop, resume) Execute home_robot Home robot axes or specific pipette Execute create_run Create a new protocol run on the robot Write control_lights Turn robot lights on or off Write upload_protocol Upload a protocol file to an Opentrons robot Read get_api_overview Get high-level overview of the Opentrons HTTP API structure and capabilities Read get_endpoint_details Get comprehensive details about a specific API endpoint Read get_protocols List all protocols stored on the robot

All 14 Opentrons MCP Server tools →

Execute tools on other servers

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Go deeper

High-risk tools in Opentrons MCP Server → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about poll_error_endpoint_and_fix

What does the poll_error_endpoint_and_fix tool do? +

Fetch specific JSON error report and automatically fix protocols. It is categorised as a Execute tool in the Opentrons 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 poll_error_endpoint_and_fix? +

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

What risk level is poll_error_endpoint_and_fix? +

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

Can I rate-limit poll_error_endpoint_and_fix? +

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

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

poll_error_endpoint_and_fix is provided by the Opentrons MCP Server MCP server (yerbymatey/opentrons-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Opentrons MCP Server tool call.

Start from Opentrons MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →