supersede_proposal · Ebony Enriching MCP: Risk & Policy

WHAT IT DOES

What supersede_proposal does on Ebony Enriching

AI agents use supersede_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 supersede_proposal needs a policy

This tool modifies the relationship between two existing proposals by marking one as superseded by another. This is a reversible write operation (updating metadata/linkage) within an append-only lab notebook system. The description is truncated, slightly lowering confidence, but the core action is a metadata update rather than deletion, execution, or financial action.

From the tool's definition 'supersede_proposal' and 'Link two proposals: new_id supersedes old_id. Sets' — creates a supersession relationship between proposals, modifying their linkage state

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

supersede_proposal Rate-limited

supersede_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": {
    "supersede_proposal": {
      "limits": [
        {
          "counter": "supersede_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 supersede_proposal

What does the supersede_proposal tool do? +

Link two proposals: new_id supersedes old_id. Sets. 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 supersede_proposal? +

Register the Ebony Enriching MCP server in PolicyLayer and add a rule for supersede_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 supersede_proposal? +

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

Can I rate-limit supersede_proposal? +

Yes. Add a rate_limit block to the supersede_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 supersede_proposal completely? +

Set action: deny in the PolicyLayer policy for supersede_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 supersede_proposal? +

supersede_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.