Extracts text from documents in chapter subfolders and saves the index to output/{name}/document-index.json. Supported formats: ${SUPPORTED_EXTENSIONS}. For images: uses Tesseract OCR with Sharp preprocessing (local, offline). For PDF (native text): uses pdf-parse (no binary required). For Word (...
AI agents call extract-document-index to retrieve information from Basic without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Even though extract-document-index only reads data, uncontrolled read access leaks sensitive information and racks up API costs — an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.
Attacks that exploit this kind of access
Extracts text from documents in chapter subfolders and saves the index to output/{name}/document-index.json. Supported formats: ${SUPPORTED_EXTENSIONS}. For images: uses Tesseract OCR with Sharp preprocessing (local, offline). For PDF (native text): uses pdf-parse (no binary required). For Word (.docx): uses mammoth (no binary required). For plain text (.txt, .md): reads directly. Run once before using ask-document or generate-quiz. Skips already-indexed files unless force=true. It is categorised as a Read tool in the Basic MCP Server, which means it retrieves data without modifying state.
Register the Basic MCP server in PolicyLayer and add a rule for extract-document-index: 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 Basic. Nothing to install.
extract-document-index 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 extract-document-index 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 extract-document-index. 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.
extract-document-index is provided by the Basic MCP server (tchoupoguy/basic-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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