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@github-actions github-actions released this 28 May 17:25
v4.0.0
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Catalyst UI v4.0.0 — formerly Claude Code Studio

Released: 2026-05-28 (testing repo)
Theme: Rebrand + Hugging Face Hub integration

What this release is

v4.0.0 is the Catalyst UI release. The app you've been using as
"Claude Code Studio" since v1 is now called Catalyst UI —
reflecting the broader scope: a single desktop workbench for Claude,
Hugging Face, Ollama, Aider, Gemini, and OpenRouter, with every panel
built around the same terminal-first workflow.

Nothing was removed. The Claude Code CLI is still the centrepiece;
your settings, snippets, GitHub PAT, model registry, LMM journal, cost
history, and theme all carry forward automatically. See
docs/MIGRATING_FROM_CCS.md for the full walk-through.

Headline: Hugging Face panel

A new sidebar panel (smiley glyph) opens the Hugging Face Hub:

Browse

  • Search the 1M+ Hub models live (text query + optional task filter).
  • GGUF only checkbox on by default — surfaces models you can run
    locally via Ollama.
  • Result cards show downloads, likes, pipeline tag, tags, license,
    gated status.
  • Expand a card → loads the full model info + GGUF variants with
    quant tags (Q4_K_M, Q8_0, F16, etc.) and file sizes.
  • Import to Ollama button on every GGUF variant — synthesises a
    catalog entry (hf.<repo>.<quant>) and spawns
    ollama run hf.co/<repo>:<quant> via the shared MODELS_LAUNCH
    pipeline. Entry persists in the Models panel under Local with a
    "HF Import" badge.
  • Fallback Copy ollama cmd button for users who want to paste
    the command elsewhere.

Cached

  • Lists the resolved cache directory (prefers ~/.cache/huggingface/hub
    if you already have one, falls back to <userData>/hf-cache).
  • Per-repo size + Remove button.
  • Refresh.

Research

  • Disabled by default. Behind an explicit opt-in disclaimer
    (community-curated uncensored / experimental catalogs).
  • Once enabled, same search surface as Browse but seeded with
    research-leaning queries (uncensored, etc.); Import button uses
    research:true which adds a "Research" badge + a
    hf-research.<repo>.<quant> prefix so you can tell them apart in
    Models.
  • Audit log panel (collapsible, persistent at
    <userData>/huggingface-research-audit.jsonl) records every
    research launch (timestamp / repoId / quant). Clear button.

Resizable right panel

The right-side panel was a fixed 320 px wide. v4.0.0 bumps it to a
default 420 px (HF + Models both want more room as cards get
richer) and adds a 4 px drag handle on the left edge.

  • Drag to resize between 280 and 800.
  • Choice persists in localStorage.
  • Double-click the handle resets to default.

Implemented as a generic PanelResizeHandle so future layouts can
reuse it.

The rebrand (what changes, what doesn't)

Identity changes

Surface Before After
Product name Claude Code Studio Catalyst UI
Installer artifact Claude-Code-Studio-... Catalyst-UI-...
TitleBar Claude Code Studio Catalyst UI (fka Claude Code Studio)
StatusBar Claude Code Studio vX.Y.Z Catalyst UI vX.Y.Z
Popout title <label> — Claude Code Studio <label> — Catalyst UI
Start-menu shortcut Claude Code Studio Catalyst UI
Tray tooltip Claude Code Studio Catalyst UI
Onboarding modal Welcome to Claude Code Studio Welcome to Catalyst UI
Settings copy references "Claude Code Studio" references "Catalyst UI"
package.json name claude-code-studio catalyst-ui
GitHub repo LxveAce/claude-code-studio LxveAce/catalyst-ui
Testing repo claude-code-studio-testing catalyst-ui-testing

Preserved (so your install upgrades in place)

  • Windows appId stays com.lxveace.claude-code-studio — NSIS
    uses appId to decide upgrade-vs-parallel-install; we want upgrade.
  • userData directory still
    %APPDATA%/Claude Code Studio (Windows),
    ~/Library/Application Support/Claude Code Studio (macOS),
    ~/.config/Claude Code Studio (Linux). Anchored via
    app.setPath() on whenReady. Nothing in your state directory
    moves or gets renamed.

Auto-update path

Users on v3.2.1 will see v4.0.0 via the in-app updater (Settings →
Updates → Check for updates). The v3.2.1 update fix (Item 2 of the
v3.2.1 polish pass) is exactly what makes this work — latest.yml
now ships with every release.

GitHub maintains permanent redirects from the old repo URL to the new
one, so v3.2.1 binaries' baked-in LxveAce/claude-code-studio updater
endpoint continues to resolve after the lockstep repo rename.

Verification

  • npx tsc --noEmit clean
  • npm run vite:build clean
  • All 8 Phase B PRs merged and verified individually on testing-master:
PR Title
#38 feat(hf): @huggingface/hub backend service + IPC + types
#39 feat(hf): HFPanel UI — Browse / Cached / Research sub-tabs
#40 feat(hf): GGUF → Ollama bridge (Import button + shared launcher)
#41 feat(hf): Research catalogs + audit log + research-mode imports
#42 feat(layout): resizable right panel + 420 default + persist width
#43 chore(rename): Catalyst UI (formerly Claude Code Studio)
#44 release(v4.0.0): bump version + CHANGELOG + release notes

What's next

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