AI agents call crow_trilium_get_note to retrieve information from Crow without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The 'get' verb and 'Get a note' description clearly indicate this tool retrieves or queries existing data (a note) from the Trilium note-taking system without creating, modifying, deleting, or executing any operations. This is a straightforward Read operation with minimal security risk—the worst case is unauthorized access to note content, not data loss or code execution.
From the tool's definition Tool name 'crow_trilium_get_note' and description 'Get a note' indicate a retrieval operation with no modification capability.
Documented attack patterns abuse exactly the kind of access crow_trilium_get_note gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Crow, and nothing reaches the server without passing your rules. This is the rule we recommend for crow_trilium_get_note:
{
"version": "1",
"default": "deny",
"tools": {
"crow_trilium_get_note": {}
}
}crow_trilium_get_note is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get a note. It is categorised as a Read tool in the Crow MCP Server, which means it retrieves data without modifying state.
Register the Crow MCP server in PolicyLayer and add a rule for crow_trilium_get_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 Crow. Nothing to install.
crow_trilium_get_note is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the crow_trilium_get_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 crow_trilium_get_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.
crow_trilium_get_note is provided by the Crow MCP server (kh0pper/crow). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Crow, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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576 Crow tools catalogued and risk-classified — across an index of 43,000+ MCP servers.