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What's New in v1.4.0

Two new agent integrations — Kimi CLI and Mistral Vibe — plus sync skills enabled by default and a round of parsing and shell fixes.

New

  • Kimi CLI support - Initialize Kimi CLI as a skills-only tool. OpenSpec skills land in .kimi/skills/ for use via /skill:openspec-*.
  • Mistral Vibe support - Initialize Mistral Vibe as a skills-only tool, with skills generated under .vibe/skills/.
  • Sync skills by default - New installs now generate /opsx:sync skills and commands out of the box in the core profile.

Improved

  • Clearer validation hints - When a requirement has SHALL/MUST only in its header, openspec validate now tells you to move the keyword onto the requirement body line instead of showing a generic error.

Fixed

  • Case-insensitive requirement headers - Requirement headers now parse regardless of capitalization, so specs no longer fail over header casing.
  • Zsh completions on oh-my-zsh - Tab completion now installs correctly under oh-my-zsh's compinit setup.

New Contributors

  • @Miss-you made their first contribution in [#1003]
  • @davseby made their first contribution in [#1031]
  • @JiangWay made their first contribution in [#1043]
  • @HowardYan888 made their first contribution in [#1059]
  • @Pluviobyte made their first contribution in [#1135]

Full Changelog: https://github.com/Fission-AI/OpenSpec/compare/v1.3.1...v1.4.0

Source: README.md, updated 2026-06-01