write_proposal · Ebony Enriching MCP: Risk & Policy

WHAT IT DOES

What write_proposal does on Ebony Enriching

AI agents use write_proposal 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_proposal needs a policy

This tool creates or modifies proposal records in the research notebook. It is reversible (proposals can be superseded via the sibling 'supersede_proposal' tool), so it falls under Write rather than Destructive. The severity is medium because misuse could pollute the research record with invalid proposals, but the append-only semantics and presence of supersession mechanisms limit damage.

From the tool's definition Tool name is 'write_proposal' and description states 'Write a proposal to `proposals/<subdir>/<id>.md`', indicating creation/modification of proposal documents in a filesystem-backed notebook system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

write_proposal Rate-limited

write_proposal 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_proposal": {
      "limits": [
        {
          "counter": "write_proposal_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_proposal

What does the write_proposal tool do? +

Write a proposal to proposals/<subdir>/<id>.md. Subdir is. 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_proposal? +

Register the Ebony Enriching MCP server in PolicyLayer and add a rule for write_proposal: 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_proposal? +

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

Can I rate-limit write_proposal? +

Yes. Add a rate_limit block to the write_proposal 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_proposal completely? +

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

write_proposal 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.