create_block · Logseq MCP Tools MCP: Risk & Policy

WHAT IT DOES

What create_block does on Logseq MCP Tools

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

WHY IT NEEDS A POLICY

Why create_block needs a policy

create_block creates new data in a Logseq knowledge graph. This is reversible (blocks can be deleted via remove_block), so it falls under Write rather than Destructive. The severity is medium because misuse could clutter or corrupt a knowledge base structure, but damage can be undone. Confidence is reduced slightly (0.85 vs higher) due to the empty tool description, though the name and server context are clear.

From the tool's definition Tool name 'create_block' combined with server context describing 'creating pages, managing blocks' indicates data creation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_block Rate-limited

create_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": {
    "create_block": {
      "limits": [
        {
          "counter": "create_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 Logseq MCP Tools, so you can run agents against it safely.

FAQ

Questions about create_block

What does the create_block tool do? +

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

How do I enforce a policy on create_block? +

Register the Logseq MCP Tools MCP server in PolicyLayer and add a rule for create_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 Logseq MCP Tools. Nothing to install.

What risk level is create_block? +

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

Can I rate-limit create_block? +

Yes. Add a rate_limit block to the create_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 create_block completely? +

Set action: deny in the PolicyLayer policy for create_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 create_block? +

create_block is provided by the Logseq MCP Tools MCP server (mikeysrecipes/logseq-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.