Examine digital signature fields in a PDF document. Args: - file_path (string): Absolute path to a local PDF file - response_format (
AI agents call inspect_signatures to retrieve information from Pdf Reader without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries metadata about digital signatures in a PDF without side effects. It does not create, modify, delete, or execute anything—it only inspects and reports on signature field information. This is consistent with other read-only tools on the server like get_metadata, read_text, and read_images.
From the tool's definition Tool name is 'inspect_signatures' with description 'Examine digital signature fields in a PDF document.' The verb 'inspect' and 'examine' indicate read-only operations.
Attacks that exploit this kind of access
Examine digital signature fields in a PDF document. Args: - file_path (string): Absolute path to a local PDF file - response_format (. It is categorised as a Read tool in the Pdf Reader MCP Server, which means it retrieves data without modifying state.
Register the Pdf Reader MCP server in PolicyLayer and add a rule for inspect_signatures: 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 Pdf Reader. Nothing to install.
inspect_signatures 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 inspect_signatures 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 inspect_signatures. 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.
inspect_signatures is provided by the Pdf Reader MCP server (shuji-bonji/pdf-reader-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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