graph_build_batch · Ms Graph Dev MCP: Risk & Policy

WHAT IT DOES

What graph_build_batch does on Ms Graph Dev

AI agents invoke graph_build_batch to trigger actions in Ms Graph Dev. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why graph_build_batch needs a policy

While the tool itself only constructs and validates the request body (not sending it), it is explicitly designed to build executable API calls. The /$batch endpoint is a mechanism to execute multiple Microsoft Graph operations in a single request.

From the tool's definition Tool builds batch POST requests to Microsoft Graph's /$batch endpoint, combining up to 20 API calls. The description indicates it constructs request bodies for 'POST' operations that can include any of the sibling categories (users, files, mail, calendar,…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

graph_build_batch Rate-limited

graph_build_batch stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "graph_build_batch": {
      "limits": [
        {
          "counter": "graph_build_batch_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about graph_build_batch

What does the graph_build_batch tool do? +

Build a Microsoft Graph JSON batch request body — combine up to 20 API calls into a single POST to /$batch. It is categorised as a Execute tool in the Ms Graph Dev MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on graph_build_batch? +

Register the Ms Graph Dev MCP server in PolicyLayer and add a rule for graph_build_batch: 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 Ms Graph Dev. Nothing to install.

What risk level is graph_build_batch? +

graph_build_batch is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit graph_build_batch? +

Yes. Add a rate_limit block to the graph_build_batch 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 graph_build_batch completely? +

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

graph_build_batch is provided by the Ms Graph Dev MCP server (stubbedev/ms-graph-dev-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.