Read all form fields from a PDF file
AI agents call read_pdf_fields to retrieve information from Pdf Filler Recursive Simple without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a query operation that extracts metadata (form field names/structures) from a PDF without modifying, executing code, deleting, or committing any financial operations. It is a pure read operation with minimal blast radius if misused—worst case being extraction of field information that may already be visible in the document.
From the tool's definition Tool name 'read_pdf_fields' and description 'Read all form fields from a PDF file' explicitly indicate data retrieval with no side effects. The verb 'read' is characteristic of Read category tools.
Attacks that exploit this kind of access
Read all form fields from a PDF file. It is categorised as a Read tool in the Pdf Filler Recursive Simple MCP Server, which means it retrieves data without modifying state.
Register the Pdf Filler Recursive Simple MCP server in PolicyLayer and add a rule for read_pdf_fields: 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 Filler Recursive Simple. Nothing to install.
read_pdf_fields 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 read_pdf_fields 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 read_pdf_fields. 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.
read_pdf_fields is provided by the Pdf Filler Recursive Simple MCP server (songminkyu/pdf-filler-recursive-simple-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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