build_rag_index · MedVision MCP: Risk & Policy

WHAT IT DOES

What build_rag_index does on MedVision MCP

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

WHY IT NEEDS A POLICY

Why build_rag_index needs a policy

Based on the tool name alone, 'build_rag_index' most likely creates or builds a Retrieval-Augmented Generation (RAG) index from medical data, which is a Write operation (creating/modifying a data structure). The sibling tool 'load_rag_index' supports this interpretation — one builds, one loads. No description is available to confirm, so confidence is lowered.

From the tool's definition Tool name 'build_rag_index'; description is empty and uninformative.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

build_rag_index Rate-limited

build_rag_index 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": {
    "build_rag_index": {
      "limits": [
        {
          "counter": "build_rag_index_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 MedVision MCP, so you can run agents against it safely.

FAQ

Questions about build_rag_index

What does the build_rag_index tool do? +

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

How do I enforce a policy on build_rag_index? +

Register the MedVision MCP server in PolicyLayer and add a rule for build_rag_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 MedVision MCP. Nothing to install.

What risk level is build_rag_index? +

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

Can I rate-limit build_rag_index? +

Yes. Add a rate_limit block to the build_rag_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.

How do I block build_rag_index completely? +

Set action: deny in the PolicyLayer policy for build_rag_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.

What MCP server provides build_rag_index? +

build_rag_index is provided by the MedVision MCP server (u9401066/medvision-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.