Vault Rooms

What it is

Vault Rooms shares selected folders of your Obsidian vault ("rooms") with trusted people on the same local network. One device hosts a small relay server; everyone else joins it from the plugin.

Create a room, invite members, grant per-path permissions, and collaborate on Markdown-backed workflows like Kanban boards and Tasks. It is LAN-first, deny-by-default, and never exposes your whole vault.

Identity is per-server: each device gets one token for the server it joined. Teams are named permission groups you can grant to a room at once; rooms are the shared folder boundary and are owned independently of any team. A room's access list grants or denies a user or a team, per path pattern.

What it is not

Not cloud sync, not NAT traversal, not mobile, and not a sandbox for other Obsidian plugins. It syncs every regular file in a shared folder - text as text, everything else as binary - except dotfiles and dotfolders (see "Known limitations"). Character-level co-editing applies only to Markdown notes (see "CRDT sync"); it starts on for new rooms and can be changed per room.

Quick start

On the hosting device:

1. Panel → Set up and share. The wizard shows four steps: Connection, About you, Shared folder, Invite.
2. Connection - enter this computer's stable LAN hostname (for example My-Vault.local) when available, or its current LAN IP, then Check connection. A .local hostname survives ordinary DHCP address changes. The wizard does not advance on its own; press Continue once the check passes.
3. About you - enter the name teammates will see, then Create my account.
4. Shared folder - Choose folder, adjust Room name if you want, then Create room.
5. Invite - pick View and edit or View only, then Create invite link. Copy message gives you a sendable message with the link in it; Copy link only gives the bare link. The link works once, expires in 60 minutes, and needs Vault Rooms installed on your teammate's computer. Create another link if it expires; I'll invite someone later finishes without creating one.

The plugin does not create hostnames or discover an address automatically. Use an existing hostname or current IP during setup. After the entered address passes the host-side check, automatic server startup is enabled. The guided flow applies the current room defaults without asking for technical settings, including Live editing for Markdown notes.

On the teammate's device: install Vault Rooms, click the link, add a display name, join, then choose Add to this computer for the room under Rooms.

LAN share: reachable from this device only proves the host can reach its own address. It cannot prove the teammate's firewall or Wi-Fi client isolation will allow the connection - if they can't connect, use Test connection and see "Troubleshooting".

Architecture

One device runs the relay; every other device is a client that only makes outbound connections to it. Your vault content never leaves your local network: there is no cloud service, no relay outside your LAN, and no analytics or telemetry of any kind.

There is exactly one exception to "no Internet traffic at all", and it carries no vault data: on load, the plugin makes a single anonymous GET to the public GitHub Releases API to see whether a newer version exists, and shows a notice if so. It sends no vault content, no room or file names, and no identifier of you or your server - only what any HTTPS request reveals to GitHub (your IP address and the fact that a request was made). It fails silently, so being offline costs nothing. See SECURITY.md.

The relay can run two ways, speaking the same protocol either way:

• Embedded (recommended) - the plugin runs it in-process. Click Start sharing; no terminal, no config file.
• Standalone - a separate process, for development or for hosting on an always-on machine or NAS instead of someone's laptop.

The relay owns all permission enforcement. SQLite stores metadata and CRDT state; current whole-file content is kept as immutable, content-addressed blobs outside SQLite. Clients hold a working copy of the rooms they mount.

Security model

See SECURITY.md for the threat model, token handling, and revocation limits. In short:

• The relay enforces every permission, per path, on both its request and live-sync channels. The plugin UI is convenience only. A member never receives content - or even filenames - for paths they cannot read.
• New servers use pinned TLS. The server has a persistent identity whose fingerprint travels in every invite, and clients pin it before sending any credential. This authenticates the server and encrypts LAN traffic; it is not end-to-end encryption - the relay handles plaintext.
• Creating the first owner is the only unauthenticated privileged action, and it is gated twice so a malicious web page cannot claim your server. It closes permanently once an owner exists.
• Built for a LAN you already trust. Don't port-forward it or expose it to the Internet, and don't rely on it to keep data from people you've already invited.
• A server created before pinned TLS stays on plaintext until its owner runs the migration in Settings.
• Vault Rooms cannot sandbox other Obsidian plugins: a local plugin that can read a synced file can read it.

The panel

One status chip answers a single question - is your work syncing - using six states: Syncing, Connecting, Reconnecting, Not syncing, No access, Not set up. Hosting is a separate line below it, and appears only when this computer hosts, needs recovery, or has a hosting error; the two can disagree, which is exactly what happens when you work on a teammate's server while your own keeps running for others.

Below that are three tabs:

• Rooms - the working list. Each row says where the room is on this computer and offers Open, Add to this computer, Remove from this computer, or Switch, plus Manage.
• People - grouped by what someone can actually reach (Can edit/Can view and whether it comes through a team), not by Friends versus Teams. Teams are listed below with their own Manage.
• Activity - the audit log. It is not shown at all unless you can read it: the server owner and team managers can, an ordinary member cannot.

A tab with something needing attention shows a count next to its name. Technical detail - the server address, raw permissions, plugin suggestions, the folder overrides - lives behind Connection details, Manage, or Advanced rather than on the default screen. Destructive actions sit inside those surfaces and confirm first. Tabs are keyboard-navigable with arrow keys.

Rooms, mounting, and access

The room's source is the folder in the owner's vault that it shares - the one real copy everyone else reconciles against. In the room's Manage surface the owner sees it as In your vault at …, and everyone else as Shared from the owner's vault at …. Each device then keeps its own working copy: the owner shares in place (no second copy), while everyone else downloads the room into a folder under their root. Both the folder name teammates see and the folder used on this computer can be changed under Manage → Advanced.

Access can be withdrawn at four granularities, all enforced by the relay:

• One rule in one room - the person keeps whatever else they were granted.
• A team membership - they keep access granted directly or via another team.
• A whole user - revokes their account and all their device tokens, closing their live sessions.
• A single device - for a lost or compromised machine, without touching that person's other devices.

Deleting a room removes it and its history from the server; files already downloaded to someone's vault stay on their disk, only the sync tracking is dropped. Deleting a team removes its memberships and grants, not the rooms themselves.

Revocation stops future access. It cannot delete copies that were already synced to someone's device.

Rejoining creates a fresh identity, and the relay's file list is always the source of truth: files it has newer versions of are downloaded, files it has deleted are removed locally, files already in sync are left alone, and local edits you never pushed are preserved as a timestamped conflict copy rather than discarded. The same reconciliation runs on first mount, re-mount, and reconnect.

How edits sync

By default, concurrent edits to the same file are first save wins: the device that saves second keeps its version as a local-only conflict copy rather than losing it. The Rooms panel marks the room Needs a choice and offers Keep mine / Keep teammate's version.

Two things soften that for files which autosave constantly (a drawing plugin can save on every stroke): rapid edits to one file are coalesced into a single push, and a room can be set to Owner's version always wins instead of keeping both.

Latency: after you stop typing your edit is pushed within a fraction of a second, and the relay broadcasts it to every mounted device immediately - there is no polling. A device that was offline reconnects on its own, re-subscribes, and reconciles; you never need to add the room again. The panel's status chip tells you whether you're actually live.

CRDT sync (live editing for Markdown notes)

New rooms start with Manage → Live editing on, giving their Markdown notes real-time, character-level merging. Existing rooms keep their previously saved value, and a manager can turn the setting on or off per room. Two people typing in the same note merge deterministically instead of one edit becoming a conflict copy.

• Markdown notes only, and not .excalidraw.md. Every other file type in the room - including *.excalidraw.md, which stores a drawing as structured JSON inside a Markdown file - keeps using normal whole-file sync. Merging that JSON character by character could produce a drawing that no longer loads.
• Turning it on or off is non-destructive. Existing notes are seeded from their current content; disabling just returns to whole-file sync.
• Renames move the note, keeping its content and history - even with the note open on both devices.
• Creating or renaming a note while disconnected is not lost. The intent is written to disk, survives an Obsidian restart, and is replayed once the connection is back - the note keeps its identity and history, and a dropped acknowledgement can never produce a duplicate. Replay needs the relay to be on 0.2.6 or newer; against an older relay the pending change stays queued and you get one notice saying the server must be upgraded.
• Two people creating a note at once get two notes. Every new Obsidian note starts with the same default name, so the first to reach the relay keeps it and the other is filed under a name including its creator, with a notice explaining why. Their text is never merged together.
• A name you type is never rewritten. Renaming onto a name a teammate already used is refused with a notice so you can choose another.
• Per-keystroke merging needs the note open in your editor. A device with the room merely mounted still receives every change, just on the ordinary latency budget above.
• Open notes show live cursors. When authorized teammates have the same CRDT Markdown note open, each sees the other's caret and selection with their authenticated display name and a relay-assigned color, unique among live users in that room session and tuned to your theme. Presence disappears when the editor or session closes; it is note-scoped, not a room-wide online status. V1 deliberately has no participant bar.
• Older plugin versions can read but not write a note in this mode; they get a clear rejection rather than a silent conflict.
• No new network surface - it rides the same authenticated connection.

This is the newest part of the plugin. Keep backups for important content while it continues its soak period. See SECURITY.md for its durability characteristics.

Plugin capability model

A room can recommend companion plugins (Kanban, Tasks); the room's Manage surface shows whether they're enabled locally. Vault Rooms never grants permission to run someone else's plugin code.

Known limitations

• No end-to-end encryption and no encrypted-at-rest database. The relay and authorized clients see plaintext.
• No cloud relay, NAT traversal, or mobile support. Desktop, one LAN.
• Synced file types: every regular file in a room's folder, with one exception (below). Markdown, .txt, .canvas, .json, .csv, and .excalidraw sync as UTF-8 text; every other extension (images, PDFs, audio, video, Office documents, anything unlisted) uses base64 on the current sync wire. The relay decodes it before storage, so file and storage limits count real bytes and binary content no longer inflates relay.sqlite. Base64 still adds about 33% to an in-flight frame and peak transport memory; optional raw sync framing remains future work. A device predating this widening never sees a file outside the old whitelist at all.
• Whole-file retention is latest-only. Superseded and deleted content is reference-checked and collected; a default 256 MiB stored-content ceiling prevents unbounded growth. Lowering the ceiling never blocks reads, deletes, cleanup, or a replacement that reduces usage. The physical SQLite file only returns freed pages to the filesystem after Vault Rooms: Reclaim relay database space; this is explicit because compaction briefly pauses writes and needs additional memory.
• Dotfiles and dotfolders (any path segment starting with ., e.g. .env, .secrets/) never sync, deliberately - sharing a room's folder shouldn't risk shipping a teammate's local secrets file. This is the same rule that already excludes the vault's own config folder and .git/node_modules.
• Revoking access, or deleting a room or team, cannot delete copies already synced to someone's device.
• Character-level co-editing and cursor presence only exist when a room has Live editing enabled, and only for Markdown notes other than *.excalidraw.md. Cursor presence is ephemeral: it appears only for authorized teammates who currently have the same note open, is not persisted, and does not provide a room-wide participant or online list.
• CRDT caveats: per-keystroke merging applies only to a note open in your editor; renaming a note that's open on another device makes that device lose editor focus, which Obsidian controls; and disabling CRDT for a room stops using its history without deleting it.
• Renames are a real move only for CRDT-enabled Markdown notes. Every other file type - including *.excalidraw.md - re-uploads on rename.
• Offline create/rename replay covers CRDT Markdown notes only. Other file types still reconcile the ordinary way on reconnect, which for a rename means a re-upload under the new name.
• Device tokens are stored unencrypted in Obsidian's plugin data. A lost device can be revoked on its own.
• Single-host topology: whoever hosts must stay running. If their machine sleeps, sync stops for everyone.
• No clustering, and not built for load-balancing - one process, one database. Fine for a small team editing occasionally, not for a write-heavy workload.
• If a host uses a raw IP and DHCP changes it, old invite links and saved endpoints go stale. Prefer a stable .local hostname that already resolves. Current pinned-TLS clients can press Find server on LAN; legacy HTTP or older clients must use Update address or a fresh invite. Recovery preserves the server identity, login, rooms, mounts, teams, friendships, and access.

Troubleshooting

Start with Connection details → Test connection in the panel (or Test in Settings → Vault Rooms → Servers). It checks the address, whether anything answers, whether it's a Vault Rooms server with the expected identity, and whether this device's login still works - then names the step that failed.

• A teammate can't reach the server: on the host, open Connection details and confirm the line reads LAN share: reachable from this device. If it says not a LAN address, the address can't work for anyone else no matter what your own machine says - a loopback address like 127.0.0.1 always means "the computer that's asking", so it sends every teammate back to their own machine. Use this device's LAN address instead. A browser can't validate a pinned server, so it isn't a useful check either.
• The host's IP changed: do not recreate the server, rooms, teams, or friendships. Set the host's Public URL override to an existing stable .local hostname if possible and restart sharing. Existing IP and hostname settings are never rewritten automatically. On a current pinned-TLS client still trying the old IP, open Connection details → Find server on LAN; the three-second multicast/broadcast search runs only when pressed and saves an address only after the pinned server, user, and device identities match. Use Update address for legacy HTTP. Older plugin versions cannot rediscover a DHCP-changed IP and need the new address or a fresh invite. A fresh 0.2.7 invite also matches the existing connection by serverId instead of creating another identity.
• The invite link does nothing: the plugin must already be installed and enabled on that device - the link can't install it.
• Live editing isn't merging, or changes take seconds: open the note and run "Vault Rooms: Diagnose live editing (CRDT) for the active note". It names the missing content-sync link and also reports whether cursor transport is ready, whether this device published its cursor, and which remote names are visible. Most often Live editing is simply off for that room. Existing rooms keep their saved value; check Manage → Live editing and save the room settings.
• A teammate's cursor isn't visible: both devices need Vault Rooms 0.2.4 or newer, the same CRDT Markdown note open, the room mounted with live editing enabled, a live connection, and file:read access to that exact path. Cursor presence is intentionally absent when a note is only synced in the background.
• A teammate's edits aren't showing up: confirm both devices show In your vault at …, not Not on this computer. Only rooms added to the computer hold a live subscription.
• "This server must be upgraded before offline Markdown creates or renames can replay safely": you created or renamed a note while disconnected, and the relay is older than 0.2.6, so it cannot confirm the change exactly once. Nothing is lost - the pending change stays on disk and replays as soon as the host updates. Update the hosting device's plugin, or undo the rename and redo it while connected.
• A teammate never sees a file I added (.docx, .mp4, a file with no extension): they're on a build older than 0.2.6, which only understood a fixed list of file types. Rather than hand them content they'd write to disk incorrectly, the relay hides those paths from them entirely. Both devices need 0.2.6 or newer. Also check the file isn't a dotfile and isn't over the server's size limit.
• Server identity mismatch: the peer presented a different identity, so Vault Rooms stopped before sending credentials. Confirm the address; after a reinstall, get a fresh invite and verify its fingerprint with the owner through a channel you trust. There is deliberately no trust-anyway override.
• "Invalid or expired credentials" on one server only: that server's data was reset after your token was issued. Forget the stale entry in Settings → Vault Rooms → Servers, then join again.
• Writes are denied: check the access rules for that user or team and path pattern.

License

MIT - see LICENSE.