hedgedoc-mcp-server 0.2.0

MCP server for HedgeDoc 1.x — create collaborative markdown notes with Mermaid diagrams

HedgeDoc MCP Server

MCP server for HedgeDoc 1.x — the open-source collaborative markdown editor. Create notes and Mermaid diagrams from OpenCode and other MCP-compatible AI agents.

Note: This is built for HedgeDoc 1.x (formerly CodiMD). It uses the HedgeDoc 1.x API, which differs from HedgeDoc 2.

Tools

Tool	Description
hedgedoc_create	Create a new note with a random ID
hedgedoc_create_with_alias	Create a new note with a custom URL alias (requires FreeURL mode)
hedgedoc_read	Read the raw markdown content of a note
hedgedoc_info	Get note metadata (title, description, timestamps)
hedgedoc_create_diagram	Create a note with a Mermaid diagram

Usage

export HEDGEDOC_URL="https://hedgedoc.your-instance.com"
uvx hedgedoc-mcp-server stdio

HedgeDoc 1.x does not use API tokens for note operations. Authentication is handled via session cookies (browser) or instance configuration (see Production Ready guide).

OpenCode config

{
  "mcp": {
    "hedgedoc": {
      "type": "local",
      "enabled": true,
      "command": ["uvx", "hedgedoc-mcp-server", "stdio"],
      "environment": {
        "HEDGEDOC_URL": "https://hedgedoc.your-instance.com"
      }
    }
  }
}

Requirements

Requirement	Notes
HedgeDoc 1.x instance	Tested on 1.x. Not compatible with HedgeDoc 2.
Python 3.11+
uv (recommended)	Or pip install hedgedoc-mcp-server

API Endpoints Used

This server uses the following HedgeDoc 1.x API endpoints:

Method	Endpoint	Used by
POST	/new	Create a note (random ID)
POST	/new/{alias}	Create a note (custom alias)
GET	/{id}/download	Read raw markdown
GET	/{id}/info	Read metadata

For more details, see the official API docs.

Instance Configuration

Your HedgeDoc administrator may need to configure these settings:

Setting	Impact	Docs
CMD_ALLOW_ANONYMOUS=true	Allows note creation without login	Users and Privileges
CMD_ALLOW_FREEURL=true	Enables custom URL aliases	Users and Privileges
CMD_RATE_LIMIT_NEW_NOTES=20	Max new notes per 5 minutes (default: 20)	Web Security
CMD_DOCUMENT_MAX_LENGTH=100000	Max note length in chars (default: 100k)	HedgeDoc basics
CMD_DISABLE_NOTE_CREATION=false	If true, no notes can be created	Users and Privileges

Development

git clone https://github.com/Jyzus/kaymer-hedgedoc-mcp
cd kaymer-hedgedoc-mcp
uv venv && uv pip install -e .
HEDGEDOC_URL="https://hedgedoc.your-instance.com" uv run hedgedoc-mcp-server

License

MIT