add_text_block · Metabase MCP Server MCP: Risk & Policy

WHAT IT DOES

What add_text_block does on Metabase MCP Server

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

WHY IT NEEDS A POLICY

Why add_text_block needs a policy

This tool creates or modifies dashboard content (text blocks/headings) but does not execute code, delete data, or cause financial impact. The operation is reversible and has minimal blast radius - an AI agent adding unwanted text to a dashboard can be easily corrected. This aligns with the Write category for content creation operations.

From the tool's definition Tool description states 'Add a text block or heading to a dashboard' - this is a create/modify operation that adds content to a dashboard reversibly.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_text_block Rate-limited

add_text_block 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": {
    "add_text_block": {
      "limits": [
        {
          "counter": "add_text_block_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 Metabase MCP Server, so you can run agents against it safely.

FAQ

Questions about add_text_block

What does the add_text_block tool do? +

Add a text block or heading to a dashboard - use this for explanatory text, titles, or instructions. It is categorised as a Write tool in the Metabase 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 add_text_block? +

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

What risk level is add_text_block? +

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

Can I rate-limit add_text_block? +

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

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

add_text_block is provided by the Metabase MCP Server MCP server (thangnm93/metabase-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.