append_to_note · Sidvy MCP Server MCP: Risk & Policy

WHAT IT DOES

What append_to_note does on Sidvy MCP Server

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

WHY IT NEEDS A POLICY

Why append_to_note needs a policy

This tool modifies existing data by appending content to a note. It is a Write operation since it changes existing content but does so in a reversible way (content can be removed or the note can be edited). Misuse could corrupt notes or add unwanted content, giving it medium severity.

From the tool's definition 'Append content to an existing note' — adds data to an existing note, which is a reversible modification

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

append_to_note Rate-limited

append_to_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": {
    "append_to_note": {
      "limits": [
        {
          "counter": "append_to_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 Sidvy MCP Server, so you can run agents against it safely.

FAQ

Questions about append_to_note

What does the append_to_note tool do? +

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

How do I enforce a policy on append_to_note? +

Register the Sidvy MCP Server MCP server in PolicyLayer and add a rule for append_to_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 Sidvy MCP Server. Nothing to install.

What risk level is append_to_note? +

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

Can I rate-limit append_to_note? +

Yes. Add a rate_limit block to the append_to_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 append_to_note completely? +

Set action: deny in the PolicyLayer policy for append_to_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 append_to_note? +

append_to_note is provided by the Sidvy MCP Server MCP server (martinhjartmyr/sidvy-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.