mark_important · Elastic Brain ZH MCP: Risk & Policy

WHAT IT DOES

What mark_important does on Elastic Brain ZH

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

WHY IT NEEDS A POLICY

Why mark_important needs a policy

This tool creates or modifies data (the importance/relevance scoring metadata of entities) in a reversible manner. It does not delete data (would be Destructive), execute arbitrary code (would be Execute), nor retrieve data without side effects (would be Read). The modification is reversible—importance scores can be unmarked or adjusted later.

From the tool's definition Tool modifies entity state by 'boosting its relevance score' in the knowledge graph, which is a reversible update operation. The description explicitly states it marks entities as important, indicating a state change to stored data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

mark_important Rate-limited

mark_important 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": {
    "mark_important": {
      "limits": [
        {
          "counter": "mark_important_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 Elastic Brain ZH, so you can run agents against it safely.

FAQ

Questions about mark_important

What does the mark_important tool do? +

Mark entity as important in knowledge graph (memory) by boosting its relevance score. It is categorised as a Write tool in the Elastic Brain ZH MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on mark_important? +

Register the Elastic Brain ZH MCP server in PolicyLayer and add a rule for mark_important: 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 Elastic Brain ZH. Nothing to install.

What risk level is mark_important? +

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

Can I rate-limit mark_important? +

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

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

mark_important is provided by the Elastic Brain ZH MCP server (tocharianou/elastic-brain-zh). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.