obsidian-ts-mcp

A Model Context Protocol (MCP) server that wraps the official Obsidian CLI, letting AI agents in VS Code (and any other MCP client) read, write, search, and manage notes inside an Obsidian vault.

Prerequisites

The Obsidian desktop app must be running when the MCP server is in use. The obsidian binary must be available on your PATH.

Installation

git clone https://github.com/dickiedyce/obsidian-ts-mcp.git
cd obsidian-ts-mcp
npm install
npm run build

Configuration

VS Code (user-level MCP)

Add the following to your VS Code MCP configuration:

{
  "servers": {
    "obsidian": {
      "type": "stdio",
      "command": "node",
      "args": ["/absolute/path/to/obsidian-ts-mcp/dist/server.js"],
      "env": {
        "OBSIDIAN_VAULT": "My Vault"
      }
    }
  }
}

Claude Desktop

Add to claude_desktop_config.json (~/Library/Application Support/Claude/claude_desktop_config.json on macOS, %APPDATA%\Claude\claude_desktop_config.json on Windows):

{
  "mcpServers": {
    "obsidian": {
      "command": "node",
      "args": ["/absolute/path/to/obsidian-ts-mcp/dist/server.js"],
      "env": {
        "OBSIDIAN_VAULT": "My Vault"
      }
    }
  }
}

Set OBSIDIAN_VAULT to the name of the vault you want to target. The name must match exactly what Obsidian shows in the vault switcher.

Environment variables

Available tools

The server exposes 26 tools organised into nine groups.

Core -- note management

Discovery and context

Properties and metadata

Tasks

Daily notes (extended)

Templates

Links

Properties (extended)

Tags (extended)

File management

Bases

Project structure

src/
  cli.ts          -- Low-level Obsidian CLI wrapper (exec, arg building, errors).
  tools.ts        -- MCP tool definitions (names, descriptions, JSON schemas).
  handlers.ts     -- Dispatches tool calls (26 tools) to CLI commands.
  server.ts       -- MCP server entry-point (stdio transport, error handling).
  validation.ts   -- Input validation against tool schemas.
tests/
  cli.test.ts           -- Unit tests for argument building and error types.
  runObsidian.test.ts   -- Tests for CLI execution, timeouts, vault targeting.
  handlers.test.ts      -- Tests for all 26 tool handlers (CLI is mocked).
  tools.test.ts         -- Schema validation for every tool definition.
  validation.test.ts    -- Input validation tests (types, enums, required fields).
  server.test.ts        -- Server factory, error formatting, version checks.

Development

npm run dev           # Watch-mode TypeScript compilation
npm test              # Run the test suite once
npm run test:watch    # Run tests in watch mode
npm run test:coverage # Run tests with coverage report
npm run build         # One-shot compilation
npm run lint          # Run ESLint
npm run format:check  # Check Prettier formatting
npm start             # Start the MCP server on stdio

How it works

1. An MCP client (VS Code, Claude Desktop, etc.) launches the server over stdio.

2. The client calls tools/list and receives the 26 tool definitions from src/tools.ts.

3. When the client invokes a tool, src/server.ts routes the call to handleTool() in src/handlers.ts.

4. handleTool() validates input against the tool schema, then uses buildArgs() and runObsidian() from src/cli.ts to execute the corresponding obsidian CLI command.

5. The CLI output is returned to the client as a text content block.

Testing

Tests use Vitest and mock the CLI layer so they never invoke the real Obsidian binary. Run:

npm test

Security considerations

• Full vault access. The server has read/write access to every note in the targeted vault. Limit OBSIDIAN_VAULT to vaults you are comfortable exposing to AI agents.

• No authentication. The stdio transport has no built-in auth. Access control depends entirely on who can launch the server process.

• Input validation. All tool inputs are validated against their declared schemas before execution. The server uses execFile (not exec) to avoid shell injection, but note that file/path values are passed directly to the Obsidian CLI.

• Environment inheritance. The child process inherits the parent's environment variables. Avoid storing secrets in env vars visible to the server process.

Troubleshooting

Symptom : obsidian: command not found
Cause: CLI binary not on PATH
Fix: Ensure Obsidian 1.12+ is installed and the CLI is enabled in Settings > General

Symptom : Command timed out after 15000ms
Cause: Obsidian desktop app not running
Fix: Start the Obsidian app before using the MCP server

Symptom : vault not found
Cause: Vault name mismatch
Fix: Check that OBSIDIAN_VAULT matches the exact name in Obsidian’s vault switcher

Symptom : Catalyst licence required
Cause: Missing licence
Fix: The Obsidian CLI requires a Catalyst licence — purchase one at obsidian.md

Symptom : Server exits immediately
Cause: Node.js version too old
Fix: Ensure Node.js >= 18 (node --version)

Licence

MIT