Hatchdoor

Hatchdoor is a self-hosted, agent-native web app for your Obsidian-style Markdown vault. Browse, search, and edit your notes in a fast web UI, and give AI agents first-class access to the very same vault over the Model Context Protocol (MCP).

Point an MCP client like Claude, Claude Code, Codex, Cursor, or Hermes at Hatchdoor and your agent can read, search (keyword and semantic), create, edit, move, and link notes. Every action goes through the same safe, atomic vault operations the UI uses, with optional automatic git commit-and-push. The web UI and your agents are two front doors to one vault.

Your Markdown files stay the source of truth. Hatchdoor builds a disposable SQLite read model for fast browsing, links, backlinks, keyword search, semantic search, graph data, and metadata. If the cache is deleted, Hatchdoor rebuilds it from the vault.

Hatchdoor was built with AI coding agents, primarily Claude Code and Codex, under close human review, with tests and a documented safety model.

▶  Try the live demo, a read-only public vault, or read the user documentation for setup and usage guides.

Contents

• What You Get
• Screenshots
• Who It Is For
• Quick Start With Docker
• Data And Safety Model
• Configuration
• MCP Agent Access
• Versioning and Git Sync
• Running Without Docker
• Troubleshooting
• Security Notes
• Development
• Project Docs
• License

What You Get

• A web UI for browsing folders and Markdown notes.
• Clean note URLs at /n/:slug.
• Obsidian-style wikilinks for [[Note]], [[Folder/Note]], and [[Note|Alias]].
• Markdown rendering with GitHub-flavored Markdown, math, Mermaid diagrams, frontmatter, images, attachments, and broken-link styling.
• Keyword search and semantic search.
• Recent notes, backlinks, outbound links, stats, and graph views.
• Browser write support when the vault mount is writable.
• Attachment uploads, local asset serving, and inline previews for linked PDF vault assets.
• A first-class MCP server so AI agents can read, search, create, edit, and link notes with the same safety as the UI.
• Optional automatic git commits and pushes for Hatchdoor writes.
• PWA assets and service worker caching for common read paths.
• Distroless, rootless container image (no shell, runs as nonroot) that deploys with either Docker or Podman.

Screenshots

Knowledge graph: notes, links, and tags	Semantic + keyword search
Dark mode	Responsive & installable (PWA)

Who It Is For

Hatchdoor is useful if you have a folder of Markdown notes and want a private web interface for them.

It is beginner-friendly enough to run with Docker Compose, but it also includes advanced features for people who want agent access, git-backed vault sync, semantic search, and local development.

Hatchdoor is not a hosted sync service, not a multi-user collaboration platform, and not a replacement for Obsidian. It is a self-hosted companion for a Markdown vault you control.

Quick Start With Docker

1. Requirements

You need:

• Docker and Docker Compose (Podman and podman compose also work)
• A Markdown vault folder, or an empty folder if you want Hatchdoor to create a starter vault

2. Create Your Config

Copy the example environment file:

cp .env.example .env

The defaults create a starter vault beside the Compose file. To use an existing vault, uncomment its host path in .env:

HOST_VAULT_PATH=/absolute/path/to/your/markdown-vault

What these mean:

• HOST_VAULT_PATH is your Markdown vault on the host machine.
• HOST_CACHE_PATH, HOST_STATE_PATH, and HOST_MODELS_PATH are optional host-side locations for the generated cache, authoritative Vault registry, and downloaded models; Compose defaults them beside the project.

Before the first managed-Vault start, create the default authoritative state directory with access for the image's numeric nonroot user. Docker otherwise may create a missing bind source as root, leaving the registry unwritable:

mkdir -p data/state
chmod 700 data/state
sudo chown 65532:65532 data/state

For rootless Podman, use podman unshare chown 65532:65532 data/state instead of sudo chown. Apply the same ownership rule to a custom HOST_STATE_PATH.

Do not add ordinary Settings values to .env: an unset value can be changed live in Settings. See Configuration for the few deployment values that always remain environment-only.

3. Start Hatchdoor

docker compose up -d

Docker Compose binds Hatchdoor to a non-loopback container interface, so a first run without a web token stops safely and prints a fresh, recoverable token. Retrieve it with:

docker compose logs hatchdoor

Copy the printed HATCHDOOR_WEB_BEARER_TOKEN=... assignment into .env, then start again with docker compose up -d. The token is deliberately not stored by Hatchdoor; use the one from that refusal or generate a new long random token. Once the server is running, open http://localhost:42824 and enter it in the browser prompt.

4. Choose Your Search Model

Hatchdoor images include no model weights. On first launch, before it downloads anything, Hatchdoor asks you to pick one: Gemma (multilingual, the default, requires accepting its terms) or Nomic Embed Text v1.5 (English-only, no terms to accept). Either way the model and its acceptance receipt stay in HOST_MODELS_PATH and persist across restarts; Hatchdoor never sends vault content anywhere. Vault features stay unavailable until setup finishes.

5. Container Image And Paths

The image is published on Docker Hub:

battermanz/hatchdoor:latest          # also version tags, e.g. 2.5.0
battermanz/hatchdoor:podman-latest   # for Podman users (podman-<version> too)

The runtime image is distroless and rootless. It is built on gcr.io/distroless/cc-debian13:nonroot, ships no shell or package manager, and runs as an unprivileged nonroot user. Hatchdoor also runs unchanged under Podman (rootless included); swap docker / docker compose for podman / podman compose and the image tag for podman-latest (or podman-<version>) — the latest tag above is Docker-only.

Docker Compose mounts:

Container path	Purpose
/data/vault	Markdown vault, source of truth
/data/cache	Generated SQLite cache
/data/state	Authoritative Vault identities and source definitions
/models	Downloaded search model and local Gemma terms receipt

Data And Safety Model

Hatchdoor is designed around a simple rule: your Markdown vault is the source of truth.

• Markdown files live in VAULT_PATH.
• Vault identities and source definitions live in /data/state/vaults.json. A Vault's Git HTTPS credential is stored there too, so the file is created with 0600 permissions on Unix and belongs in a backup you treat as secret. The API never returns it: a Vault reports only credential_configured, and an edit that means to keep a stored secret says so with https_credentials: {"action": "keep"} rather than resending it.
• SQLite is a generated cache and can be rebuilt.
• The SQLite cache should live outside the vault.
• Hatchdoor scans .md files under the vault while excluding built-in and configured noise paths (including .hatchdoor-trash).
• Delete actions move notes and referenced assets into .hatchdoor-trash.
• Archive actions move notes under HATCHDOOR_ARCHIVE_PREFIX.
• Browser write actions are available only when the vault is writable.
• MCP is disabled by default.
• MCP requires its own bearer token whenever it is enabled.
• Versioning is off by default; it can keep local Git history or safely sync an existing remote.

Upgrading an existing single-Vault deployment requires persistent /data/state; see the legacy single-Vault upgrade guide for detection, recovery, and rollback constraints.

If VAULT_PATH contains no Markdown files, Hatchdoor creates a small starter vault (a lightweight PARA-style structure with onboarding notes) before the first index build. Existing vaults are never seeded or modified. The starter notes are ordinary Markdown you can edit, move, or delete like any other.

For write access: browser writes, MCP writes, attachment uploads, and git sync all require the vault mount, cache directory, and state directory to be writable by the container's non-root runtime user. Read-only browsing works with a read-only vault mount as long as the cache and state directories stay writable. If write features are unexpectedly disabled, check those mount permissions.

Hatchdoor doesn't require any particular vault layout — PARA, Zettelkasten, Andrej Karpathy's LLM wiki pattern, or none of the above all work. The user documentation compares them, and How to run an LLM wiki in Hatchdoor walks through the layer-based setup (raw sources on a separate .hatchdoor-layer, default surface for the curated wiki).

Configuration

Copy .env.example to .env. Its values are all commented out: Docker Compose and Hatchdoor supply the ordinary defaults, and Settings owns live server configuration. A non-empty value for a server-wide Settings key in .env is an intentional environment pin: it wins over the saved Settings value for that process, and shows as Set in .env in Settings until the pin is removed and the container restarts. Vault definitions themselves are managed per Vault through Settings, the HTTP API, or MCP, not through .env.

Two defaults worth knowing before you deploy:

• Hatchdoor refuses to start on HOST=0.0.0.0 or another non-loopback bind unless HATCHDOOR_WEB_BEARER_TOKEN is set. On refusal it prints a fresh token and the .env line to add; that's the fix, not a bug.
• HATCHDOOR_DEMO_MODE=true runs a read-only, unauthenticated instance for public browsing. It has no rate limiting of its own (search embeds every query, note downloads bundle attachments in memory), so put a rate-limiting reverse proxy in front before exposing it publicly.

Every deployment variable, every live Settings-editable value, layer and exclusion rules, and how the search index and cache work are documented in full in Settings and environment variables reference and The layer system.

MCP Agent Access

The embedded MCP endpoint is disabled by default, at http://127.0.0.1:42824/mcp. It has its own bearer token, separate from the web token, required even for read-only access, because /mcp bypasses the web auth layer. Turn it on and generate a token in Settings → Agent access (MCP); turn on write access separately, only once you trust what the agent will do with it. Changes apply to new MCP requests immediately, no restart required.

Full client setup (Claude Code, Codex, OpenClaw, Hermes), the Vault-scope contract every tool call needs, and the attachment-upload paths are in Connect your agent and MCP tools reference.

Versioning and Git Sync

Versioning is configured per Vault, not per server: choose No Git, Local history, Pull-only, or Two-way on that Vault's Settings page. Merge conflicts are always kept for human resolution; Hatchdoor never force-checks out over uncommitted manual vault edits.

See How to set up a Git-backed Vault for setup, and docs/migrations/legacy-single-vault.md if you're upgrading a pre-registry single-Vault deployment.

Running Without Docker

If just is installed, just dev-start builds on top of the manual steps below to also track PIDs and prevent duplicate servers or stale build-cache directories from piling up; just dev-stop shuts both down cleanly, and just --list shows the rest (dev-status, dev-clean, prod-check). See the justfile for what each recipe does. Build artifacts are shared through the primary checkout across linked worktrees; explicit CARGO_TARGET_DIR, CARGO_HOME, and HATCHDOOR_TMPDIR values can override the portable defaults.

Otherwise, build the frontend once:

cd frontend
npm ci
npm run build
cd ..

Run the backend:

cargo run

By default, local source runs bind to 127.0.0.1:42824 and read ./vault. Point Hatchdoor at a real vault with:

VAULT_PATH=/path/to/notes cargo run

For frontend dev mode:

# terminal 1
cargo run

# terminal 2
cd frontend
npm run dev

The first-run model choice also applies to local development. Hatchdoor stores models in ./models by default, so no model-prefetch command is required.

Troubleshooting

Hatchdoor refuses to start on 0.0.0.0

Set HATCHDOOR_WEB_BEARER_TOKEN, bind to 127.0.0.1, or enable HATCHDOOR_DEMO_MODE=true for a read-only public demo. This is intentional: a non-loopback bind can expose your vault to the network.

The app starts with a starter vault

Hatchdoor seeds starter notes only when VAULT_PATH contains no Markdown files. If you expected an existing vault, this almost always means the container mounted an empty directory: double-check HOST_VAULT_PATH in .env isn't a typo or a stale Docker volume shadowing the mount.

For write permission issues, MCP 401/403, git sync problems, and more, see How to troubleshoot common problems in the user documentation. Every HTTP endpoint is documented in HTTP API reference.

Security Notes

• Use a long random HATCHDOOR_WEB_BEARER_TOKEN.
• Do not expose Hatchdoor publicly without HTTPS in front of it.
• Use HATCHDOOR_DEMO_MODE=true only for browse-only public test instances.
• Keep MCP disabled unless you need it.
• Treat MCP write mode as powerful: it can create, edit, move, delete, and import content.
• Keep the SQLite cache outside the vault.
• Keep .env out of git.
• Review Docker volume paths before starting the container.

Development

Backend checks:

cargo fmt --check
CARGO_BUILD_JOBS=1 cargo clippy --all-targets -- -D warnings
CARGO_BUILD_JOBS=1 cargo test

Frontend checks:

cd frontend
npm run format:check
npm run typecheck
npm run lint
npm test
npm run build

Build and publish the Docker image:

docker build -t battermanz/hatchdoor:latest .
docker tag battermanz/hatchdoor:latest battermanz/hatchdoor:2.5.0
docker push battermanz/hatchdoor:2.5.0
docker push battermanz/hatchdoor:latest

Project Docs

• User documentation: setup, configuration, and day-to-day usage guides for running Hatchdoor, hosted in a Hatchdoor vault itself.
• Documentation index: architecture, collaboration, roadmap, research, maintenance, and historical records.
• Product roadmap: draft overall product direction and the workstreams it breaks into.
• Design system: visual tokens, component patterns, layout rules, and interaction states used by the frontend.
• Semantic search strategy: decision record for shipping pure semantic search instead of hybrid retrieval or a cross-encoder reranker in the runtime path.

License

Hatchdoor is licensed under the GNU Affero General Public License v3.0 only. See LICENSE.

Third-party material — bundled icons, and the embedding models downloaded at runtime — is recorded in THIRD_PARTY_NOTICES.