modify_index · Azure AI Foundry MCP Server MCP

WHAT IT DOES

What modify_index does on Azure AI Foundry MCP Server

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

WHY IT NEEDS A POLICY

Why modify_index needs a policy

An AI agent can call modify_index faster than any human can review — one bad instruction and it creates or modifies resources in Azure AI Foundry MCP Server by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

modify_index Rate-limited

modify_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": {
    "modify_index": {
      "limits": [
        {
          "counter": "modify_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 Azure AI Foundry MCP Server, so you can run agents against it safely.

FAQ

Questions about modify_index

What does the modify_index tool do? +

Updates an AI Search index with a new index definition. It is categorised as a Write tool in the Azure AI Foundry MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on modify_index? +

Register the Azure AI Foundry MCP Server MCP server in PolicyLayer and add a rule for modify_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 Azure AI Foundry MCP Server. Nothing to install.

What risk level is modify_index? +

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

Can I rate-limit modify_index? +

Yes. Add a rate_limit block to the modify_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 modify_index completely? +

Set action: deny in the PolicyLayer policy for modify_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 modify_index? +

modify_index is provided by the Azure AI Foundry MCP Server MCP server (youssef7788/mcp-foundry). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.