markdown-vault-mcp 1.3.1

Generic markdown vault MCP server with FTS5 + semantic search

markdown-vault-mcp

A generic markdown collection MCP server with FTS5 full-text search, semantic vector search, frontmatter-aware indexing, incremental reindexing, and non-markdown attachment support.

Point it at a directory of Markdown files (an Obsidian vault, a docs folder, a Zettelkasten) and it exposes search, read, write, and edit tools over the Model Context Protocol.

Features

• Full-text search — SQLite FTS5 with BM25 scoring, porter stemming
• Semantic search — cosine similarity over embedding vectors (Ollama, OpenAI, or Sentence Transformers)
• Hybrid search — Reciprocal Rank Fusion combining FTS5 and vector results
• Frontmatter-aware — indexes YAML frontmatter fields, supports required field enforcement
• Incremental reindexing — hash-based change detection, only re-processes modified files
• Write operations — create, edit, delete, rename documents with automatic index updates
• Attachment support — read, write, delete, and list non-markdown files (PDFs, images, etc.)
• Git integration — optional auto-commit and push on every write via GIT_ASKPASS
• OIDC authentication — optional token-based auth for HTTP deployments (Authelia, Keycloak, etc.)
• MCP tools — 13 tools including search, read, write, edit, delete, rename, and admin operations

Installation

From PyPI

pip install markdown-vault-mcp

With optional dependencies:

pip install markdown-vault-mcp[mcp]            # FastMCP server
pip install markdown-vault-mcp[embeddings-api]  # Ollama/OpenAI embeddings via HTTP
pip install markdown-vault-mcp[all]             # MCP + API embeddings (lightweight, no PyTorch)
pip install markdown-vault-mcp[all-local]       # + sentence-transformers + PyTorch (large)

[all] vs [all-local]: The [all] extra is lightweight and does not include sentence-transformers or PyTorch. Use [all-local] if you want local CPU/GPU embeddings without Ollama. The Docker image uses [all].

From source

git clone https://github.com/pvliesdonk/markdown-vault-mcp.git
cd markdown-vault-mcp
pip install -e ".[all,dev]"

Docker

docker pull ghcr.io/pvliesdonk/markdown-vault-mcp:latest

The Docker image uses [all] (MCP + API embeddings). It does not include sentence-transformers or PyTorch — use Ollama or OpenAI for embeddings. For local sentence-transformers, build from source with [all-local].

Quick Start

As a library

from pathlib import Path
from markdown_vault_mcp import Collection

collection = Collection(source_dir=Path("/path/to/vault"))
results = collection.search("query text", limit=10)

As an MCP server

export MARKDOWN_VAULT_MCP_SOURCE_DIR=/path/to/vault
markdown-vault-mcp serve

With Docker Compose

1. Copy an example env file:

   cp examples/obsidian-readonly.env .env
   

2. Edit .env to set MARKDOWN_VAULT_MCP_SOURCE_DIR to the absolute path of your vault on the host.

3. Start the service:

   docker compose up -d
   

4. Check the logs:

   docker compose logs -f markdown-vault-mcp
   

Example env files

File	Description
examples/obsidian-readonly.env	Obsidian vault, read-only, Ollama embeddings
examples/obsidian-readwrite.env	Obsidian vault, read-write with git auto-commit
examples/obsidian-oidc.env	Obsidian vault, read-only, OIDC authentication (Authelia)
examples/ifcraftcorpus.env	Strict frontmatter enforcement, read-only corpus

For reverse proxy (Traefik) and deployment setup, see docs/deployment.md.

Configuration

All configuration is via environment variables with the MARKDOWN_VAULT_MCP_ prefix (except embedding provider settings, which use their own conventions).

Core

Variable	Default	Required	Description
MARKDOWN_VAULT_MCP_SOURCE_DIR	—	Yes	Path to the markdown vault directory
MARKDOWN_VAULT_MCP_READ_ONLY	true	No	Set to false to enable write operations
MARKDOWN_VAULT_MCP_INDEX_PATH	in-memory	No	Path to the SQLite FTS5 index file; set for persistence across restarts
MARKDOWN_VAULT_MCP_EMBEDDINGS_PATH	disabled	No	Path to the numpy embeddings file; required to enable semantic search
MARKDOWN_VAULT_MCP_STATE_PATH	{SOURCE_DIR}/.markdown_vault_mcp/state.json	No	Path to the change-tracking state file
MARKDOWN_VAULT_MCP_INDEXED_FIELDS	—	No	Comma-separated frontmatter fields to promote to the tag index for structured filtering
MARKDOWN_VAULT_MCP_REQUIRED_FIELDS	—	No	Comma-separated frontmatter fields required on every document; documents missing any are excluded from the index
MARKDOWN_VAULT_MCP_EXCLUDE	—	No	Comma-separated glob patterns to exclude from scanning (e.g. .obsidian/**,.trash/**)

Server identity

Variable	Default	Description
MARKDOWN_VAULT_MCP_SERVER_NAME	markdown-vault-mcp	MCP server name shown to clients; useful for multi-instance setups
MARKDOWN_VAULT_MCP_INSTRUCTIONS	(auto)	System-level instructions injected into LLM context; defaults to a description that reflects read-only vs read-write state

Search and embeddings

Variable	Default	Description
EMBEDDING_PROVIDER	auto-detect	Embedding provider: ollama, openai, or sentence-transformers (not MARKDOWN_VAULT_MCP_-prefixed)
OLLAMA_HOST	http://localhost:11434	Ollama server URL (not MARKDOWN_VAULT_MCP_-prefixed)
OPENAI_API_KEY	—	OpenAI API key for the OpenAI embedding provider (not MARKDOWN_VAULT_MCP_-prefixed)
MARKDOWN_VAULT_MCP_OLLAMA_MODEL	nomic-embed-text	Ollama embedding model name
MARKDOWN_VAULT_MCP_OLLAMA_CPU_ONLY	false	Force Ollama to use CPU only

Git integration

Enables auto-commit and push on every write. Requires MARKDOWN_VAULT_MCP_READ_ONLY=false.

Variable	Default	Description
MARKDOWN_VAULT_MCP_GIT_TOKEN	—	GitHub/GitLab PAT; when set, every write triggers a git commit and deferred push via GIT_ASKPASS
MARKDOWN_VAULT_MCP_GIT_PUSH_DELAY_S	30	Seconds of write-idle time before pushing; 0 = push only on shutdown
MARKDOWN_VAULT_MCP_GIT_COMMIT_NAME	markdown-vault-mcp	Git committer name for auto-commits; set this in Docker where git config user.name is empty
MARKDOWN_VAULT_MCP_GIT_COMMIT_EMAIL	noreply@markdown-vault-mcp	Git committer email for auto-commits

Attachments

Non-markdown file support. See Attachments for details.

Variable	Default	Description
MARKDOWN_VAULT_MCP_ATTACHMENT_EXTENSIONS	(built-in list)	Comma-separated allowed extensions without dot (e.g. pdf,png,jpg); use * to allow all non-.md files
MARKDOWN_VAULT_MCP_MAX_ATTACHMENT_SIZE_MB	10.0	Maximum attachment size in MB for reads and writes; 0 disables the limit

OIDC authentication

Optional token-based authentication for HTTP deployments. OIDC activates when all four required variables are set. See Authentication for setup details.

Variable	Required	Description
MARKDOWN_VAULT_MCP_BASE_URL	Yes	Public base URL of the server (e.g. https://mcp.example.com)
MARKDOWN_VAULT_MCP_OIDC_CONFIG_URL	Yes	OIDC discovery endpoint (e.g. https://auth.example.com/.well-known/openid-configuration)
MARKDOWN_VAULT_MCP_OIDC_CLIENT_ID	Yes	OIDC client ID registered with your provider
MARKDOWN_VAULT_MCP_OIDC_CLIENT_SECRET	Yes	OIDC client secret
MARKDOWN_VAULT_MCP_OIDC_JWT_SIGNING_KEY	No	JWT signing key; required on Linux/Docker — the default is ephemeral and invalidates tokens on restart. Generate with openssl rand -hex 32
MARKDOWN_VAULT_MCP_OIDC_AUDIENCE	No	Expected JWT audience claim; leave unset if your provider does not set one
MARKDOWN_VAULT_MCP_OIDC_REQUIRED_SCOPES	No	Comma-separated required scopes; default openid

CLI Reference

markdown-vault-mcp <command> [options]

serve

Start the MCP server.

markdown-vault-mcp serve [--transport {stdio|sse|http}] [--host HOST] [--port PORT]

Flag	Default	Description
--transport	stdio	MCP transport: stdio (stdin/stdout, default), sse (Server-Sent Events), http (streamable-HTTP). Use http for Docker with a reverse proxy or when OIDC is enabled.
--host	0.0.0.0	Bind host for the http transport (ignored for stdio and sse)
--port	8000	Port for the http transport (ignored for stdio and sse)

index

Build the full-text search index.

markdown-vault-mcp index [--source-dir PATH] [--index-path PATH] [--force]

search

Search the collection from the CLI.

markdown-vault-mcp search <query> [-n LIMIT] [-m {keyword|semantic|hybrid}] [--folder PATH] [--json]

reindex

Incrementally reindex the vault (only processes changed files).

markdown-vault-mcp reindex [--source-dir PATH] [--index-path PATH]

MCP Tools

Tool	Description
search	Hybrid full-text + semantic search with optional frontmatter filters
read	Read a document or attachment by relative path
write	Create or overwrite a document or attachment
edit	Replace a unique text span in a document (notes only)
delete	Delete a document or attachment and its index entries
rename	Rename/move a document or attachment, updating all index entries
list_documents	List indexed documents; pass include_attachments=true to also list non-markdown files
list_folders	List all folder paths in the vault
list_tags	List all unique frontmatter tag values
reindex	Force a full reindex of the vault
stats	Get collection statistics (document count, chunk count, etc.)
build_embeddings	Build or rebuild vector embeddings for semantic search
embeddings_status	Check embedding provider and index status

Write tools (write, edit, delete, rename) are only available when MARKDOWN_VAULT_MCP_READ_ONLY=false.

Attachments

In addition to Markdown notes, the server can read, write, delete, rename, and list non-markdown files (PDFs, images, spreadsheets, etc.). All existing tools are overloaded — no new tool names.

How it works

Path dispatch is extension-based: a path ending in .md is treated as a note; any other path is treated as an attachment if the extension is in the allowlist. The kind field on returned objects distinguishes the two: "note" or "attachment".

Reading attachments

read returns base64-encoded content for binary attachments:

{
  "path": "assets/diagram.pdf",
  "mime_type": "application/pdf",
  "size_bytes": 12345,
  "content_base64": "<base64 string>",
  "modified_at": 1741564800.0
}

Writing attachments

write accepts a content_base64 parameter for binary content:

{ "path": "assets/diagram.pdf", "content_base64": "<base64 string>" }

Listing attachments

list_documents with include_attachments=true returns both notes and attachments:

[
  { "path": "notes/intro.md", "kind": "note", "title": "Intro", "folder": "notes", "frontmatter": {}, "modified_at": 1741564800.0 },
  { "path": "assets/diagram.pdf", "kind": "attachment", "folder": "assets", "mime_type": "application/pdf", "size_bytes": 12345, "modified_at": 1741564800.0 }
]

Default allowed extensions

pdf, docx, xlsx, pptx, odt, ods, odp, png, jpg, jpeg, gif, webp, svg, bmp, tiff, zip, tar, gz, mp3, mp4, wav, ogg, txt, csv, tsv, json, yaml, toml, xml, html, css, js, ts

Override with MARKDOWN_VAULT_MCP_ATTACHMENT_EXTENSIONS. Use * to allow all non-.md files.

Hidden directories: Attachments inside hidden directories (.git/, .obsidian/, .markdown_vault_mcp/, etc.) are never listed, regardless of extension settings. MARKDOWN_VAULT_MCP_EXCLUDE patterns are also applied to attachments.

Authentication

OIDC authentication is optional and activates automatically when all four required variables (BASE_URL, OIDC_CONFIG_URL, OIDC_CLIENT_ID, OIDC_CLIENT_SECRET) are set.

OIDC requires --transport http (or sse). It has no effect with --transport stdio.

Setup with Authelia

Note: Authelia does not support Dynamic Client Registration (RFC 7591). Clients must be registered manually in configuration.yml.

1. Register the client in Authelia:

   identity_providers:
     oidc:
       clients:
         - client_id: markdown-vault-mcp
           client_secret: '$pbkdf2-sha512$...'   # authelia crypto hash generate
           redirect_uris:
             - https://mcp.example.com/auth/callback
           grant_types: [authorization_code]
           response_types: [code]
           pkce_challenge_method: S256
           scopes: [openid, profile, email]
   

2. Set the environment variables (see also examples/obsidian-oidc.env):

   MARKDOWN_VAULT_MCP_BASE_URL=https://mcp.example.com
   MARKDOWN_VAULT_MCP_OIDC_CONFIG_URL=https://auth.example.com/.well-known/openid-configuration
   MARKDOWN_VAULT_MCP_OIDC_CLIENT_ID=markdown-vault-mcp
   MARKDOWN_VAULT_MCP_OIDC_CLIENT_SECRET=your-client-secret
   MARKDOWN_VAULT_MCP_OIDC_JWT_SIGNING_KEY=$(openssl rand -hex 32)
   

3. Start with HTTP transport:

   markdown-vault-mcp serve --transport http --port 8000
   

JWT signing key

The FastMCP default signing key is ephemeral (regenerated on startup), which forces clients to re-authenticate after every restart. Set MARKDOWN_VAULT_MCP_OIDC_JWT_SIGNING_KEY to a stable random secret to avoid this:

# Generate once, store in your .env file
openssl rand -hex 32

Development

git clone https://github.com/pvliesdonk/markdown-vault-mcp.git
cd markdown-vault-mcp
uv pip install -e ".[all,dev]"

# Run tests
uv run python -m pytest tests/ -x -q

# Lint and format
ruff check src/ tests/
ruff format src/ tests/

# Type check
mypy src/

License

MIT