I fixed a race condition where the subscription callback could fire before the internal tracking map was ready. The synchronous immediate_tick() call was triggering the callback before the sender could be inserted into the shared subscription map.
I built an MCP server into jazz-tools that exposes Jazz documentation as searchable tools for AI assistants. You can run it with npx jazz-tools mcp and it gives AI coding assistants direct access to the Jazz docs.
When running commands like git fetch inside the sandbox, they couldn't talk to my running SSH agent because the relevant environment variables were being stripped out. That meant SSH would pop up and ask for my passphrase on the terminal, which garbled the Claude Code session I was working in. I added SSH_AUTH_SOCK and SSH_AGENT_PID to the list of variables that get passed through, so SSH "just works" inside the sandbox.
I built Wequencer — a collaborative real-time music sequencer — as a new example app for Jazz. It's built with Svelte 5 and Tone.js, and lets multiple users compose music together in real time.
I replaced a hand-rolled binary spawn in the Svelte end-to-end test setup with the official startLocalJazzServer helper, giving each test run its own port. This made the tests more reliable and less prone to port conflicts.
I fixed a bug where running a migration on multiple tables at once only generated the DROP COLUMN SQL for the first table, silently skipping the rest.
I fixed a bug where using .include() caused base columns to get corrupted when a subscription fired a second time. The reevaluation function was being passed the output tuple (which included extra joined columns) instead of the original base columns, causing data to shift around.
I fixed an issue where query() and subscribe() weren't applying permission policies because the session wasn't being passed through. Now the client defaults to the JWT session resolved at construction time, so policies are always enforced.
I added Svelte 5 bindings for jazz-tools, including a reactive QuerySubscription class, context helpers, a user-switcher component, and a hook for linking external identities. This lets Svelte developers use Jazz with idiomatic Svelte 5 rune-based reactivity.
The Jazz website has a showcase page listing apps built with Jazz. I added two new projects — Alkalye and Hifz Garden — and redesigned the layout from a vertical list to a 3-column card grid with randomised ordering on each load. I also added a "Submit your app" button so other developers can easily get their projects listed.
I added support for floating-point columns in the database. The TypeScript side already allowed col.float() and generated the right SQL, but the Rust SQL parser was rejecting it with an "UnsupportedType" error.
I replaced a hand-rolled singularize function with the pluralize-esm library. The old function only handled a few suffix patterns and got common English plurals wrong — for example, it was turning "canvases" into "Canvase" instead of "Canvas".
I fixed a bug where using .include() on message queries caused the message text to come out garbled. The root cause was that an internal descriptor wasn't being updated after array subqueries were compiled, so the data was being read from the wrong columns.
I went back to my old Chicken Dinner Timer app and fixed a handful of small bugs I'd been meaning to sort out. I corrected an invalid input type, zero-padded the start time so the browser's time picker would actually bind to it, made the timeline entries sort by number instead of alphabetically, and fixed an addTime function that was ignoring the value it was given in favour of a stale closure variable.
When a user logged out of a Jazz React Native app, their session ID was accidentally left behind in secure storage even though the rest of their credentials were removed. I fixed the logout function to also clean up the session ID, so there's no leftover authentication data after signing out.
When you changed data in a Jazz app and then navigated to a server-rendered page, the server could show stale information because the changes hadn't finished syncing yet. I added an optional navigation prop to the Svelte provider that automatically waits for pending syncs to complete before letting the page transition happen, so the server always has the latest data.
I wrote a quickstart guide for React developers getting started with Jazz. It consolidates the main topics into a single reference so new users can get up and running quickly.
If you tried to create content in a Jazz group where you only had read access, it would silently succeed locally but then all the data would quietly fail to sync. I made it throw a clear error right away instead, so you know immediately that you don't have permission rather than scratching your head over why your data isn't showing up.
When a Jazz CoValue failed to load, you'd just get a vague "unavailable" error with no clue why. I added smarter error messages that tell you the actual reason -- for example, if your sync setting is set to "never" or "signedUp", the error now says so instead of leaving you guessing.
Jazz uses a rich text editor library called ProseMirror for collaborative editing. One of the packages it depended on had known security vulnerabilities and was no longer maintained. I replaced it with a much simpler, locally-written version that does just what Jazz actually needs, removing the security risk and the unnecessary bloat.