write_experiment · Ebony Enriching MCP: Risk & Policy

WHAT IT DOES

What write_experiment does on Ebony Enriching

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

WHY IT NEEDS A POLICY

Why write_experiment needs a policy

This tool creates or appends new experiment records to a lab notebook system. It modifies state by recording data but does not delete, execute arbitrary code, move money, or trigger external operations beyond the notebook domain itself. The append-only design means changes are reversible through logical operations (superseding proposals).

From the tool's definition Tool name 'write_experiment' and description 'Record one run of a proposal' indicate creation/modification of experiment records. The server uses 'append-only semantics' confirming data is added reversibly without deletion.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

write_experiment Rate-limited

write_experiment 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": {
    "write_experiment": {
      "limits": [
        {
          "counter": "write_experiment_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 Ebony Enriching, so you can run agents against it safely.

FAQ

Questions about write_experiment

What does the write_experiment tool do? +

Record one run of a proposal. It is categorised as a Write tool in the Ebony Enriching MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on write_experiment? +

Register the Ebony Enriching MCP server in PolicyLayer and add a rule for write_experiment: 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 Ebony Enriching. Nothing to install.

What risk level is write_experiment? +

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

Can I rate-limit write_experiment? +

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

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

write_experiment is provided by the Ebony Enriching MCP server (parkviewlab/ebony-enriching). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.