index_documents · MCP Tooling Lab MCP: Risk & Policy

WHAT IT DOES

What index_documents does on MCP Tooling Lab

AI agents use index_documents to create or update resources in MCP Tooling Lab — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your MCP Tooling Lab environment.

WHY IT NEEDS A POLICY

Why index_documents needs a policy

This tool writes new data (document embeddings and index entries) into the Chroma vector store. It is reversible in principle (indexed documents can be deleted), so it falls under Write rather than Destructive. Misuse could lead to polluted or unauthorized data being indexed into the knowledge base, affecting downstream RAG query results, hence medium severity.

From the tool's definition 'Embed and index documents into Chroma' — creates and stores new embeddings/index entries in the Chroma vector database

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

index_documents Rate-limited

index_documents 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_documents": {
      "limits": [
        {
          "counter": "index_documents_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 MCP Tooling Lab, so you can run agents against it safely.

FAQ

Questions about index_documents

What does the index_documents tool do? +

Embed and index documents into Chroma. It is categorised as a Write tool in the MCP Tooling Lab 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_documents? +

Register the MCP Tooling Lab MCP server in PolicyLayer and add a rule for index_documents: 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 MCP Tooling Lab. Nothing to install.

What risk level is index_documents? +

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

Can I rate-limit index_documents? +

Yes. Add a rate_limit block to the index_documents 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_documents completely? +

Set action: deny in the PolicyLayer policy for index_documents. 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_documents? +

index_documents is provided by the MCP Tooling Lab MCP server (kaypon/mcp-tooling-lab). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.