add_note · Crosswalk MCP: Risk & Policy

WHAT IT DOES

What add_note does on Crosswalk

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

WHY IT NEEDS A POLICY

Why add_note needs a policy

Adding a note is a write operation that creates new data associated with an application record. It is reversible (notes can be edited or deleted) and has no destructive or financial implications. The medium severity reflects that misuse could clutter or mislead application records, but the blast radius is limited to a single application's metadata.

From the tool's definition Tool name 'add_note' and description 'Append a note' indicate the tool creates or modifies data (notes attached to applications) in a reversible manner.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_note Rate-limited

add_note 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": {
    "add_note": {
      "limits": [
        {
          "counter": "add_note_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 Crosswalk, so you can run agents against it safely.

FAQ

Questions about add_note

What does the add_note tool do? +

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

How do I enforce a policy on add_note? +

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

What risk level is add_note? +

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

Can I rate-limit add_note? +

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

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

add_note is provided by the Crosswalk MCP server (mohakgarg5/crosswalk-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.