GitHub Spec Kit repo
GitHub's open source toolkit for spec driven development, a structured process of specify, plan, then implement that any coding agent can follow instead of freeform prompting, now past its one year mark with 134,200 stars and MIT licensed.
What it does for you: Axion already enforces a written plan before code through the build-gate hook, and Spec Kit is a more complete version of the same idea, with reusable templates for specify, clarify, plan, tasks, and implement phases that could sit alongside or formalize that gate. It supports Claude Code natively in its 30 plus agent list, so it drops in without leaving the current harness, and the specify and plan templates could become the plan.md format the build-gate hook already checks for.
In practice: Mature and well travelled, the kind of project that has already survived a year of real usage rather than a launch week spike.
For: Both runtimes. It ships as plain markdown templates and shell or PowerShell scripts that any coding agent reads, including Claude Code, so it is not tied to one harness.
Verdict: build now. It reinforces a rule Axion already follows by hand, ships as inert templates with no runtime risk, and a small pilot on one TOOL-AND-APP project would show within a day whether it fits better than the current plan.md convention.
Build #1 GitHub Spec Kit: use the ai-implementation-build-intake skill to build this safely. Source: https://github.com/github/spec-kit. Save canonical skill/agent under AXION\Skills and AXION\Agents.
Source · 134,200 GitHub stars as of its one year anniversary post, MIT license, 30 plus supported coding agents including Claude Code as of version 1.0.1.