LevelCode v0.9.2

LevelCode v0.9.2

A small, practical release: your site opens itself in the editor while the agent builds it, and what a run costs is now measured in credits rather than dollars.

Highlights

The browser opens itself

LevelCode has always shipped a built-in browser — but you had to know the command to find it, so most people never did. Now it appears on its own: the moment the agent starts a web server in the background, the site opens beside the chat.

• It updates as the agent works. Edits land on disk immediately (that's the apply-then-review model — Keep/Undo comes after), so your dev server's watcher fires HMR and the preview refreshes before you click Keep. Ask for a page, watch it appear.
• It never steals your focus. A server coming up mid-run doesn't yank the caret away from whatever you're typing.
• Closing it means closed. Each address opens at most once per session, so a chatty server can't reopen the tab you just dismissed, and a restart-on-save server can't stack one tab per reload.
• Only local addresses, ever. The address is read from the dev server's own output — which is whatever a project's start script chose to print. So only localhost, 127.0.0.1, the IPv6 loopback [::1], and the bind addresses 0.0.0.0 / [::] (treated as localhost) are opened; a remote URL printed by a script is ignored. A hostile repo can't point your editor's browser somewhere else.

Turn it off with levelcode.ai.preview.autoOpen, or open previews yourself with Simple Browser: Show.

Credits, not dollars

The response bar under each run now reads Opus 4.8 · 46 credits · 1,279 left instead of dollar amounts. $1 = 100 credits, so a $100 Ultra plan is a 10,000-credit allowance.

This is a change of unit, not of price — nothing about what you pay or what a turn costs has moved. A balance that ticks down in dollars reads as money draining away; an allowance reads as something you're meant to spend, which is what it is.

• Small runs stay honest. A cheap-model turn costs a fraction of a credit, so it shows as 0.4 rather than rounding to 0 and looking free.
• One number everywhere. The editor and levelcode.ai/ai/account now format the same figure identically, down to digit grouping.

Under the hood

• The dev-server address is sniffed from the accumulated output, not a single chunk. Node delivers stdout in arbitrary slices, so a URL routinely arrives split (http://local + host:5173/) and would otherwise never be recognised — the preview would silently never open.
• verify.js gained its first test suite, and shed a stray NUL byte that had been making the whole file invisible to grep and diff.
• Release builds no longer download a Playwright browser during bootstrap — an unnecessary network dependency that failed one architecture while the other passed.

Test coverage

• 24 suites across the bundled extensions, all green on every release.
• verify.test.js (16 cases) — the preview sniffers, led by the one that matters: a remote address in command output must open nothing. creditFormat.test.js (8 cases) extracts the real formatters out of the shipped chat.html, so the tests can't drift from what ships.

Full changelog: v0.9.1...v0.9.2