note_append · Lockstep MCP: Risk & Policy

WHAT IT DOES

What note_append does on Lockstep

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

WHY IT NEEDS A POLICY

Why note_append needs a policy

Appending a note is a reversible modification operation that fits the Write category. The severity is low because note data is typically non-critical metadata in a collaborative development context, and the operation can be undone by editing or removing the appended content.

From the tool's definition Tool name 'note_append' and description 'Append a note' indicate the tool creates or modifies data (appends to an existing note) in a reversible manner.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

note_append Rate-limited

note_append 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": {
    "note_append": {
      "limits": [
        {
          "counter": "note_append_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Lockstep, so you can run agents against it safely.

FAQ

Questions about note_append

What does the note_append tool do? +

Append a note. It is categorised as a Write tool in the Lockstep MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on note_append? +

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

What risk level is note_append? +

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

Can I rate-limit note_append? +

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

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

note_append is provided by the Lockstep MCP server (tmmoore286/lockstep-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.