AI agents use pin_note to create or update resources in DMCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your DMCP environment.
Pinning/toggling a note is a write operation that modifies game state reversibly. It does not execute code, delete data irreversibly, or cause financial impact. The action is limited to updating a single note's pin status, making it a low-severity write operation with minimal blast radius even if misused by an AI agent.
From the tool's definition Tool description states "Toggle a note" which involves modifying the state of a note object in the game state management system.
Documented attack patterns abuse exactly the kind of access pin_note gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and DMCP, and nothing reaches the server without passing your rules. This is the rule we recommend for pin_note:
{
"version": "1",
"default": "deny",
"tools": {
"pin_note": {
"limits": [
{
"counter": "pin_note_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}pin_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.
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Toggle a note. It is categorised as a Write tool in the DMCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the D MCP server in PolicyLayer and add a rule for pin_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 DMCP. Nothing to install.
pin_note is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the pin_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.
Set action: deny in the PolicyLayer policy for pin_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.
pin_note is provided by the D MCP server (shawnrushefsky/dmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from DMCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
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