Claude Code and Codex plugins, built from first principles.
Axiom is a curated marketplace of shared plugins for Claude Code and Codex. One canonical metadata contract generates each host's native catalog and plugin manifest while each skill remains a single behavioral source.
Every plugin in Axiom earns its place. Before anything ships, it's measured against real task scenarios with graded, repeatable evals - so what you install is backed by empirical data, not good intentions. No toys, no vibe-coded filler, no tokens burned on output that doesn't move the needle. If it can't be measured, it doesn't ship.
Want receipts? Each plugin keeps a scored eval history in its own README, and the index below is generated so new plugin evals surface here automatically. Those histories name the host and model that produced the scored behavior evidence. Separate deterministic static and CLI installation tests prove packaging compatibility with Claude Code and Codex; they are not model scores.
The eval index is generated from .axiom/marketplace.json and each
shipped skill's evals/evals.json manifest. Plugin READMEs are the canonical
scored histories.
| Plugin | Evaluated skill manifests | Scenarios | Manifest expectations | Scored history |
|---|---|---|---|---|
| axiom-git | commit-message | 9 | 39 | Eval history |
| axiom-versioning | dependency-versions | 7 | 40 | Eval history |
Current coverage: 2 plugins, 2 evaluated skills, 16 scenarios, 79 manifest expectations.
Claude Code:
/plugin marketplace add netopsengineer/axiomCodex:
codex plugin marketplace add netopsengineer/axiomAfter installing a plugin in Codex, start a new session before invoking its bundled skills.
Plugin sources in this marketplace use relative paths, which resolve only when
the marketplace is added from a Git host (GitHub, GitLab, or a git URL) - not
from a direct URL to marketplace.json.
Composes Conventional Commits messages with gitmoji from the staged diff, deciding type, scope, emoji, subject, and body, and gating on protected branches, staged secrets, and pre-commit hooks.
Claude Code category: version-control
Codex category: Productivity
Claude Code:
/plugin install axiom-git@axiomCodex:
codex plugin add axiom-git@axiomAudits and updates external versioned dependencies across application, infrastructure, and CI/CD configurations.
Claude Code category: dependency-management
Codex category: Productivity
Claude Code:
/plugin install axiom-versioning@axiomCodex:
codex plugin add axiom-versioning@axiom.axiom/marketplace.json # Canonical catalog and plugin order
.agents/plugins/marketplace.json # Generated native Codex catalog
.claude-plugin/marketplace.json # Generated Claude Code catalog
plugins/<name>/.axiom/plugin.json # Canonical plugin metadata and version
plugins/<name>/.codex-plugin/ # Generated native Codex manifest
plugins/<name>/.claude-plugin/ # Generated Claude Code manifest
plugins/<name>/skills/ # Shared skill behavior and shipped evals
dev/<name>/ # Eval run data, not shipped
Local setup, commit conventions, the release process, and CI/CD - see CONTRIBUTING.md.