join-the-team

AI-Native Developer Experience Harness

A team-project AI harness bootstrap that gives humans and agents a shared operating contract from day one, moving AI leverage from an individual “IC superhero” advantage to a repeatable team capability on an equal playing field.

📦 Now listed on Claude Plugin Hub — install the harness as the join-the-team plugin for Claude Code, Codex, Kimi Code, and Google Antigravity. Jump to install.

This repository has gone through three real phases — and the progression tracks something happening across the field.

It started as a reference guide: DEVELOPER_EXPERIENCE.md and BOOTSTRAP.md, something to read, walk through, and adapt. A concrete baseline for teams getting serious about AI-native delivery — the operating model, the guardrails, spec-first discipline, the Adversarial Gate.

Then it became context for your agents: CLAUDE.md and GEMINI.md here, plus the thin AGENTS.md/CLAUDE.md/GEMINI.md adapters the bootstrap generates — drop them into a project and the agent picks up the operating contract at session start without a briefing. The harness shifted from something humans read to something agents use.

Now it ships as an installable plugin — join-the-team (current version in CHANGELOG.md). One install across Claude Code, Codex, Kimi, and Antigravity, and the full harness is live: 21 skills, session-start orientation, slash commands, drift-checked in CI. The discipline travels with the agent from day one, across every project, without anyone copying files or re-explaining the contract.

The point: this stopped being something you read and became something you install.

And what you install is the operating model — that is the value proposition here. Skill libraries are everywhere now; what teams are missing is the contract: who holds authority, how risk is tiered, what evidence binds a review, what "done" actually means when humans and agents ship together. The 21 skills are the capability layer that executes inside that contract — not the other way round.

The kernel stays model-, vendor-, and IDE-agnostic throughout. Thin platform adapters handle discovery and invocation; the authority, risk, evidence, review, and completion semantics are non-negotiable.

Speed is easy. Safe speed is engineered.

This is deliberately opinionated. Refine it for your team, technology, domain, authority model, and definition of done. Keep one coherent shared contract while doing so.

New project? Bootstrap in fifteen minutes. Existing agent setup? Two ways to adopt below — by hand, or as a plugin.

Two ways to adopt

By hand — clone the repo and share it with your agents. Copy .agents/skills/ into your project, keep the CLAUDE.md/GEMINI.md/AGENTS.md adapters at root, and your assistant picks up the contract at session start. BOOTSTRAP.md is the fifteen-minute walkthrough.

git clone https://github.com/jpantsjoha/ai-native-developer-experience

As a plugin — the harness ships as join-the-team: one canonical skill set, thin per-harness adapters, drift-checked in CI. It is listed on Claude Plugin Hub; install straight from this repository into whichever coding assistant you run:

Claude Code

/plugin marketplace add jpantsjoha/ai-native-developer-experience
/plugin install join-the-team@join-the-team-marketplace

Kimi Code

/plugins install https://github.com/jpantsjoha/ai-native-developer-experience

Antigravity (Gemini)

agy plugin install https://github.com/jpantsjoha/ai-native-developer-experience

Codex — no install command needed: Codex discovers .agents/skills/ natively and reads AGENTS.md as its always-on adapter. The by-hand clone above is the install.

Full per-harness detail (session-start hooks, verification, update path): Claude Code · Kimi Code · Codex · Antigravity

Antigravity is a first-class surface: this harness was built and battle-tested on Google Cloud's agent stack, and ships cloud-expert guardrails (gcp-expert, aws-expert, azure-expert, alibaba-expert) plus adk-expert and mcp-server-scaffold alongside the vendor-neutral contract.

The plugin composes with — never duplicates — companion skill plugins; see INTEGRATIONS.md.

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Is this the same as BMAD?