mux

v0.26.0 Breaking

This release includes breaking changes for platform teams planning a safe upgrade.

Published 6d AI Agents & Assistants

✓ No known CVEs patched

✓ No known CVEs patched in this version

Topics

agent ide

Summary

AI summary

Fixed SSH runtime worktree bug.

Type	Severity	Summary	CVE
Feature	Low	Adds support for Opus 4.8 Adds support for Opus 4.8 Source: llm_adapter@2026-05-28 Confidence: high	—
Performance	Medium	Bounded syntax highlighting runtime to avoid long stalls Bounded syntax highlighting runtime to avoid long stalls Source: llm_adapter@2026-05-28 Confidence: high	—
Bugfix	Medium	Fixes SSH runtime worktree bug Fixes SSH runtime worktree bug Source: llm_adapter@2026-05-28 Confidence: high	—
Bugfix	Low	Many bug-fixes and tweaks to the Goal system Many bug-fixes and tweaks to the Goal system Source: llm_adapter@2026-05-28 Confidence: high	—
Refactor	Low	Cleaned up the Custom Agents system, removed unnecessary configuration options Cleaned up the Custom Agents system, removed unnecessary configuration options Source: llm_adapter@2026-05-28 Confidence: high	—

Full changelog

This release brings support for Opus 4.8 as well as a few minor improvements.

On the visual side, long plans are now more reviewable with a sticky table of contents that appears in the gutter:

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About mux

A desktop app for isolated, parallel agentic development