set_document_tags · Ai Brain MCP: Risk & Policy

WHAT IT DOES

What set_document_tags does on Ai Brain

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

WHY IT NEEDS A POLICY

Why set_document_tags needs a policy

This tool modifies document properties (tags) or potentially document content itself ('Replace a document'). While 'replace' could theoretically affect document state significantly, it remains reversible—users can modify tags or content again. This is Write rather than Destructive because the operation is not permanent/irreversible.

From the tool's definition Tool name 'set_document_tags' and description 'Replace a document' indicate modification of existing document metadata/content. The verb 'Replace' shows reversible data modification.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_document_tags Rate-limited

set_document_tags 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": {
    "set_document_tags": {
      "limits": [
        {
          "counter": "set_document_tags_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 Ai Brain, so you can run agents against it safely.

FAQ

Questions about set_document_tags

What does the set_document_tags tool do? +

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

How do I enforce a policy on set_document_tags? +

Register the Ai Brain MCP server in PolicyLayer and add a rule for set_document_tags: 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 Ai Brain. Nothing to install.

What risk level is set_document_tags? +

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

Can I rate-limit set_document_tags? +

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

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

set_document_tags is provided by the Ai Brain MCP server (thejoshgriffith/ai-brain). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.