index_library_pdfs · Metis Public Health MCP: Risk & Policy

WHAT IT DOES

What index_library_pdfs does on Metis Public Health

AI agents use index_library_pdfs to create or update resources in Metis Public Health — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Metis Public Health environment.

WHY IT NEEDS A POLICY

Why index_library_pdfs needs a policy

The tool name strongly suggests it indexes PDF files from a library — a Write operation that creates or modifies an index/database of documents on the user's machine. The description is empty, so exact behavior is uncertain. Indexing is reversible (the index can be rebuilt or deleted), placing it in Write rather than Destructive.

From the tool's definition Tool name 'index_library_pdfs' and server description: 'answers from the user's own indexed PDF library with page-level citations' and 'keeps all data on the user's machine'

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

index_library_pdfs Rate-limited

index_library_pdfs stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "index_library_pdfs": {
      "limits": [
        {
          "counter": "index_library_pdfs_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Metis Public Health, so you can run agents against it safely.

FAQ

Questions about index_library_pdfs

What does the index_library_pdfs tool do? +

index_library_pdfs. It is categorised as a Write tool in the Metis Public Health MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on index_library_pdfs? +

Register the Metis Public Health MCP server in PolicyLayer and add a rule for index_library_pdfs: 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 Metis Public Health. Nothing to install.

What risk level is index_library_pdfs? +

index_library_pdfs is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit index_library_pdfs? +

Yes. Add a rate_limit block to the index_library_pdfs 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.

How do I block index_library_pdfs completely? +

Set action: deny in the PolicyLayer policy for index_library_pdfs. 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.

What MCP server provides index_library_pdfs? +

index_library_pdfs is provided by the Metis Public Health MCP server (sveritg/metis_ph). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.