grant_access · Looker MCP Server MCP: Risk & Policy

WHAT IT DOES

What grant_access does on Looker MCP Server

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

WHY IT NEEDS A POLICY

Why grant_access needs a policy

The name 'grant_access' strongly implies modifying access control permissions — granting privileges to users or resources. This is a Write operation (modifying permissions/ACLs) with high severity since misconfigured access grants could expose sensitive data or escalate privileges.

From the tool's definition Tool name 'grant_access' with empty description. Server description mentions 'administering users'.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

grant_access Rate-limited

grant_access 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": {
    "grant_access": {
      "limits": [
        {
          "counter": "grant_access_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 Looker MCP Server, so you can run agents against it safely.

FAQ

Questions about grant_access

What does the grant_access tool do? +

grant_access. It is categorised as a Write tool in the Looker 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 grant_access? +

Register the Looker MCP Server MCP server in PolicyLayer and add a rule for grant_access: 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 Looker MCP Server. Nothing to install.

What risk level is grant_access? +

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

Can I rate-limit grant_access? +

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

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

grant_access is provided by the Looker MCP Server MCP server (ultrathink-solutions/looker-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.