AI agents call get_last_modified_note to retrieve information from Zk Utils without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a simple retrieval of metadata about a note (specifically, which note was modified most recently). It does not create, modify, delete, execute code, or move money. It is a passive read operation with no irreversible consequences. The low severity reflects minimal blast radius if misused—an agent could only discover which note was recently edited, posing no data destruction or execution risk.
From the tool's definition Tool name 'get_last_modified_note' and description 'Retrieve the most recently modified note' indicate a read-only query operation that retrieves data without side effects.
Attacks that exploit this kind of access
Retrieve the most recently modified note. It is categorised as a Read tool in the Zk Utils MCP Server, which means it retrieves data without modifying state.
Register the Zk Utils MCP server in PolicyLayer and add a rule for get_last_modified_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 Zk Utils. Nothing to install.
get_last_modified_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 get_last_modified_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 get_last_modified_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.
get_last_modified_note is provided by the Zk Utils MCP server (koei-kaji/zk-utils). 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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