AI agents call get_metadata to retrieve information from MokuPDF without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves metadata information from an already-opened PDF file. Metadata extraction is a non-destructive, non-mutative operation that only accesses existing information without modifying, deleting, or executing any code. The blast radius of misuse is minimal—an attacker could learn document properties but cannot alter data or trigger external operations.
From the tool's definition Tool name is 'get_metadata' and description states 'Get metadata from the current PDF'. The verb 'Get' and the passive retrieval of metadata indicate a read-only operation with no side effects.
Attacks that exploit this kind of access
Get metadata from the current PDF. It is categorised as a Read tool in the MokuPDF MCP Server, which means it retrieves data without modifying state.
Register the MokuPDF MCP server in PolicyLayer and add a rule for get_metadata: 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 MokuPDF. Nothing to install.
get_metadata 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_metadata 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_metadata. 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_metadata is provided by the MokuPDF MCP server (jameslovespancakes/mokupdf). 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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