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Muster Agent 0.3.9

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@github-actions github-actions released this 12 Oct 07:04
agent-v0.3.9
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Learn about vigilant mode.

The model picker now keeps up with new releases. Claude Haiku 5.5 is added (with Light to Extra High reasoning levels; Haiku 4.5 stays). GPT-6.1 Sol and any other model Codex lists as visible show without being switched on in Settings.

  • The ChatGPT model list is read from Codex's models_cache.json with the same 16 MB limit as a model catalog. It used the 1 MB config-file limit, which a cache holding many models' full instructions can outgrow, hiding the whole list.
  • When Codex rewrites its cache and one model replaces another (same count), the picker is now told. Before, Muster compared only the number of models, so the swap was never pushed to the open app.
  • The Claude catalog (anthropic-models.json, dated 2026-10-12) is no longer masked by an old copy: an override file in the data folder or ~/.muster/ whose updated date is older than the one shipped is ignored. An override without a date is your own list and still wins. The live Anthropic /v1/models list is still added when an API key is set.

Download

Mac File
Apple silicon (M1 and later) Muster-Agent-0.3.9-arm64.dmg (or .zip)
Intel Muster-Agent-0.3.9-x64.dmg (or .zip)

Open the disk image and drag Muster Agent to Applications.

Windows File
Windows 10/11 (x64) Muster-Agent-0.3.9-win-x64-setup.exe (or the portable -win-x64.zip)

Run the installer; it installs for your user, no admin needed. It is not code-signed yet, so Windows SmartScreen may warn: choose More info → Run anyway.

Linux File
AppImage (any distro, x64) Muster-Agent-0.3.9-linux-x86_64.AppImage
Debian / Ubuntu Muster-Agent-0.3.9-linux-amd64.deb
Archive Muster-Agent-0.3.9-linux-x64.tar.gz

AppImage: chmod +x the file, then run it. Debian/Ubuntu: sudo apt install ./Muster-Agent-0.3.9-linux-amd64.deb.

Muster Server (self-hosted) File
macOS, Apple silicon muster-server-0.3.9-darwin-arm64.tar.xz
macOS, Intel muster-server-0.3.9-darwin-x64.tar.xz
Linux x64 muster-server-0.3.9-linux-x64.tar.xz

Extract it, then bin/muster-server init and bin/muster-server start. It includes its own Node runtime. Docker, systemd and TLS setups are in docs/server.md.

Windows (installed with the setup.exe), AppImage and Debian/Ubuntu installs update themselves from Settings › Updates, downloading only what changed where they can.

Checksums for every file are in SHA256SUMS.

This build is not notarized by Apple (signing: self-signed). The first time, right-click Muster Agent in Applications and choose Open, or run:

xattr -dr com.apple.quarantine "/Applications/Muster Agent.app"

Muster Agent needs a model provider sign-in; it detects the ones already on your computer on first run.

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