generated: '2026-08-13'
method: searched
source: https://registry.npmjs.org/ + https://github.com/b12io
note: >-
  B12 publishes no API client SDK, because it publishes no REST API. The npm
  surface is a design system, an MCP server, and a Claude plugin. Registry
  metadata was read from registry.npmjs.org; PyPI, RubyGems, crates.io,
  Packagist, NuGet, Maven Central and pkg.go.dev have no first-party B12
  package.

packages:
- language: javascript
  registry: npm
  name: '@b12/metronome'
  url: https://www.npmjs.com/package/@b12/metronome
  install: npm install @b12/metronome
  version: 1.1.36
  published: '2026-07-30'
  official: true
  license: Apache-2.0
  repository: https://github.com/b12io/metronome
  kind: design-system
  release_count: 50
  first_published: '2020-03-23'
  description: >-
    Metronome is the design system B12 uses for developing consistent user
    experiences. Actively maintained — 50 releases, most recent two weeks before
    this pass.
  note: >-
    UI component library, not an API client. Catalogued in full at
    components/b12-components.yml.

- language: javascript
  registry: npm
  name: '@b12/mcp-server'
  url: https://www.npmjs.com/package/@b12/mcp-server
  install: npx -y @b12/mcp-server
  version: 1.0.1
  published: '2025-04-03'
  official: true
  license: Apache-2.0
  bin: b12-mcp-server
  kind: mcp-server
  release_count: 2
  description: MCP server for b12.io.
  note: >-
    STALE, and orphaned from its own documentation. Last published 2025-04-03 —
    over sixteen months before this pass, and well behind the remote server
    B12 actually runs, which reports version 1.26.0. No B12 documentation points
    at this package name.

- language: javascript
  registry: npm
  name: '@b12/website-generator-mcp-server'
  url: null
  install: npx -y @b12/website-generator-mcp-server
  version: null
  published: null
  official: true
  license: Apache-2.0
  kind: mcp-server
  status: never-published
  repository: https://github.com/b12io/website-generator-mcp-server
  note: >-
    CHECKED, NOT FOUND. The repository's package.json declares version 1.0.3 and
    its README gives `npx -y @b12/website-generator-mcp-server` as the Claude
    Desktop install command, but registry.npmjs.org returns HTTP 404 for that
    name. B12's documented stdio install does not resolve; an agent following
    the README cannot install this server. The working alternatives are the
    remote endpoint https://mcp.b12.io/mcp or the .dxt desktop extension shipped
    in the repo.

third_party:
- language: javascript
  registry: npm
  name: '@intentsolutionsio/b12-claude-plugin'
  url: https://www.npmjs.com/package/@intentsolutionsio/b12-claude-plugin
  version: 1.0.1
  published: '2026-06-08'
  official: false
  note: >-
    Republished by a third party (repository points at
    jeremylongshore/claude-code-plugins-plus-skills), not by B12. B12's own
    distribution is the b12io/b12-plugins marketplace.
- language: javascript
  registry: npm
  name: b12-mui-theme
  url: https://www.npmjs.com/package/b12-mui-theme
  version: 1.0.0
  published: '2026-02-07'
  official: false
  note: >-
    Unrelated namesake — repository is gitlab.vbash.pp.ua/b12-drones/mui-theme,
    a different "B12". Recorded here only so a later pass does not mistake it
    for first-party.

registries_checked:
- {registry: npm, result: 3 first-party packages, 1 declared-but-unpublished}
- {registry: pypi, result: none, probes: [b12 404, b12io 404, b12-sdk 404]}
- {registry: rubygems, result: none}
- {registry: crates.io, result: none}
- {registry: packagist, result: none}
- {registry: nuget, result: none}
- {registry: maven-central, result: none}
- {registry: pkg.go.dev, result: none}

x-evidence:
  fetched: '2026-08-13'
  probes:
  - url: https://registry.npmjs.org/@b12%2fmetronome
    http_status: 200
  - url: https://registry.npmjs.org/@b12%2fmcp-server
    http_status: 200
  - url: https://registry.npmjs.org/@b12%2fwebsite-generator-mcp-server
    http_status: 404
  - url: https://api.github.com/orgs/b12io/repos
    http_status: 200