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OpenSpec v1.4.0 Adds Kimi CLI and Mistral Vibe Agent Integrations

OpenSpec v1.4.0 Adds Kimi CLI and Mistral Vibe Agent Integrations

OpenSpec, the open-source specification toolkit, just shipped v1.4.0. The headline? Two new agent integrations — Kimi CLI and Mistral Vibe — plus sync skills enabled by default. This is a meaningful step for teams who want to weave OpenSpec's skills into more workflows. Let's dig into what changed and why it matters.

What Changed

First, Kimi CLI support. You can now initialize Kimi CLI as a skills-only tool. OpenSpec skills land in .kimi/skills/, ready for use via /skill:openspec-*. That means teams can leverage OpenSpec's defined skills directly inside Kimi's command-line interface — no extra glue required.

Second, Mistral Vibe gets the same treatment. Skills are generated under .vibe/skills/. It's a parallel integration, but it opens the door for Mistral users to adopt OpenSpec's structured skill definitions without friction.

Third, sync skills are now enabled by default. Fresh installs will automatically generate /opsx:sync. This ensures that synchronization between local and remote specs happens out of the box — a small change that saves a manual step.

Finally, a round of parsing and shell fixes. The changelog doesn't detail every bug, but the release notes mention improvements that should reduce edge-case crashes and shell compatibility issues.

Why It Matters

Agent integrations are the core of this release. By adding Kimi CLI and Mistral Vibe, OpenSpec is betting on a multi-agent future. Developers aren't locked into one tool; they can bounce between agents while using the same skills. That's practical.

Syncing by default? It's a quality-of-life improvement. I've seen teams stumble over forgotten sync commands. This removes one more footgun. The parsing fixes, while less glamorous, keep the runtime stable — essential for production use.

What's missing? No word on performance benchmarks or breaking changes. Still, v1.4.0 is a solid incremental update. If you're using OpenSpec with an agent today, this is a no-brainer upgrade. If you're evaluating it, the expanded agent support makes the case stronger.

Official Source: https://github.com/Fission-AI/OpenSpec/releases/tag/v1.4.0