AI agents call notes_read to retrieve information from Macnotes without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves note content from Apple Notes without creating, modifying, or deleting data. It is a straightforward query operation that returns information without persistent state changes. The low severity reflects minimal blast radius if misused—an agent could read notes it shouldn't access, but cannot alter or destroy data.
From the tool's definition Tool name 'notes_read' combined with description 'Read one note by id or title' explicitly indicates data retrieval with no modification or side effects.
Attacks that exploit this kind of access
Read one note by id or title. It is categorised as a Read tool in the Macnotes MCP Server, which means it retrieves data without modifying state.
Register the Macnotes MCP server in PolicyLayer and add a rule for notes_read: 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 Macnotes. Nothing to install.
notes_read 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 notes_read 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 notes_read. 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.
notes_read is provided by the Macnotes MCP server (zorrobyte/macnotes-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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