// SCAN REPORT

TheBrain MCP Server

26 tools. 12 can modify or destroy data without limits.

3 destructive tools with no built-in limits. Policy required.

Last updated: 12 Jun 2026

12 can modify or destroy data

14 read-only

26 tools total

Community server · catalogue entry verified 12/06/2026

How to control TheBrain MCP Server ↓

TOOL MAP

What TheBrain MCP Server exposes to your agents

Read (14) Write / Execute (9) Destructive / Financial (3)

Running more than one server? Check your whole stack →

MOST DANGEROUS TOOLS

Critical Risk

The most dangerous TheBrain MCP Server tools

Destructive · High delete_attachment Destructive category applies because the tool permanently removes data without recovery mechanism. Destructive · High delete_link This tool irreversibly removes link relationships in a knowledge graph. Destructive · High delete_thought This tool permanently removes thoughts from TheBrain's hierarchical knowledge structure. Write · Medium add_file_attachment This tool creates or modifies data (attaches files to thoughts) without permanently destroying information.

12 of TheBrain MCP Server's 26 tools can modify, destroy, or commit something on every call — and an agent calls them with no built-in limits.

POLICY

How to control TheBrain MCP Server

PolicyLayer is an MCP gateway — it sits between your AI agents and TheBrain MCP Server, and nothing reaches the server without passing your rules. These are the rules we recommend:

Deny destructive operations

{
  "delete_attachment": {
    "deny_if": [
      {
        "conditions": [],
        "on_deny": "Blocked by default. Requires approval."
      }
    ]
  }
}

Destructive tools should never be available to autonomous agents without human approval.

Rate limit write operations

{
  "append_to_note": {
    "limits": [
      {
        "counter": "append_to_note_per_hour",
        "window": "hour",
        "max": 30,
        "scope": "grant"
      }
    ]
  }
}

Prevents bulk unintended modifications from agents caught in loops.

Cap read operations

{
  "get_attachment": {
    "limits": [
      {
        "counter": "get_attachment_per_minute",
        "window": "minute",
        "max": 60,
        "scope": "grant"
      }
    ]
  }
}

Controls API costs and prevents retry loops from exhausting upstream rate limits.

Create a free account and register TheBrain MCP Server — nothing to install.
Add these rules — paste them, or build them visually. Tune the limits to your setup.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

ENFORCE POLICY ON THEBRAIN →

Free to start. No card required.

FULL CATALOGUE

All 26 TheBrain MCP Server tools

DESTRUCTIVE 3 tools

Destructive delete_attachment Delete an attachment Destructive delete_link Delete a link Destructive delete_thought Delete a thought

WRITE 9 tools

Write append_to_note Append content to an existing note Write add_file_attachment Add a file attachment (including images) to a thought Write add_url_attachment Add a URL attachment to a thought Write create_link Create a link between two thoughts with visual properties Write create_or_update_note Create or update a note with markdown content Write create_thought Create a new thought with optional visual properties Write set_active_brain Set the active brain for subsequent operations Write update_link Update link properties including visual formatting Write update_thought Update a thought including its visual properties

READ 14 tools

Read get_attachment Get metadata about an attachment Read get_attachment_content Get the binary content of an attachment (e.g., download an image) Read get_brain Get details about a specific brain Read get_brain_stats Get statistics about a brain Read get_link Get details about a specific link Read get_modifications Get modification history for a brain Read get_note Get the note content for a thought Read get_tags Get all tags in a brain Read get_thought Get details about a specific thought Read get_thought_graph Get a thought with all its connections and attachments Read get_types Get all thought types in a brain Read list_attachments List all attachments for a thought Read list_brains List all available brains for the user Read search_thoughts Search for thoughts in a brain

EXPLORE

Related servers

Other MCP servers with similar tools — same risk classification, starter policies for each.

FAQ

Questions about TheBrain MCP Server

Can an AI agent delete data through the TheBrain MCP Server MCP server? +

Yes. The TheBrain MCP Server server exposes 3 destructive tools including delete_attachment, delete_link, delete_thought. These permanently remove resources with no undo. PolicyLayer blocks destructive tools by default so they never reach the upstream server.

How do I prevent bulk modifications through TheBrain MCP Server? +

The TheBrain MCP Server server has 9 write tools including append_to_note, add_file_attachment, add_url_attachment. Set a rate limit in your policy -- for example, 10 calls per hour prevents an agent from making more than 10 modifications per hour. PolicyLayer enforces this at the gateway, before calls reach TheBrain MCP Server.

How many tools does the TheBrain MCP Server MCP server expose? +

26 tools across 3 categories: Destructive, Read, Write. 14 are read-only. 12 can modify, create, or delete data.

How do I enforce a policy on TheBrain MCP Server? +

Register the TheBrain MCP Server MCP server in PolicyLayer, apply the suggested rules above (adjust the limits to your use case), and point your AI client at the PolicyLayer proxy URL instead of the server directly. Your agents keep the same tools; PolicyLayer evaluates every call against policy before it executes. Nothing to install, live in minutes.

Enforce policy on every TheBrain MCP Server tool call.

Deterministic rules across all 26 TheBrain MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

ENFORCE POLICY ON THEBRAIN →

Free to start. No card required.

26 TheBrain MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.