resolve_diff · Melo MCP: Risk & Policy

WHAT IT DOES

What resolve_diff does on Melo

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

WHY IT NEEDS A POLICY

Why resolve_diff needs a policy

This tool creates or modifies data by applying acceptance/rejection decisions to diffs, which are reversible operations. While it could affect scripts or game logic depending on what diffs represent, the tool itself modifies diff state rather than directly executing code or destructively deleting data.

From the tool's definition The tool 'resolve_diff' with action parameter accepts or rejects diffs programmatically, which modifies the state of diff records.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

resolve_diff Rate-limited

resolve_diff 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": {
    "resolve_diff": {
      "limits": [
        {
          "counter": "resolve_diff_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 Melo, so you can run agents against it safely.

FAQ

Questions about resolve_diff

What does the resolve_diff tool do? +

Programmatically accept or reject a diff. Useful for auto-accept workflows. Args: - diffId (string): The diff ID - action (string):. It is categorised as a Write tool in the Melo MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on resolve_diff? +

Register the Melo MCP server in PolicyLayer and add a rule for resolve_diff: 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 Melo. Nothing to install.

What risk level is resolve_diff? +

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

Can I rate-limit resolve_diff? +

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

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

resolve_diff is provided by the Melo MCP server (yannyhl/linkedsword-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.