Stay afloat. Ready for any wind.

Open-source developer tools and specifications built to detect software decay before it breaks your build.

Website  •  Agent Skills  •  npm  •  Contributing  •  Security

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Ebb Nothing ships forever. Everything ebbs. The open, zero-dependency almanac of software end-of-life. 750+ verified rules citing authoritative evidence, keyed by purl and vers. Runs offline. Documentation  ·  GitHub  ·  npm	Offing Keep end-of-life in the offing, not in production. Continuous detection of deprecated runtimes, packages, and APIs across 25+ ecosystems. Pinpoints exact file and line sources. Local-first and agent-native via MCP. Documentation  ·  GitHub  ·  npm
Mizzen Same input. Same site. A deterministic documentation engine producing byte-for-byte reproducible static sites. Preserves exact source position mapping on every HTML node for agent self-healing. Documentation  ·  GitHub  ·  npm	Lateen Easy to read. Safe to edit. An editorial documentation theme built on Mizzen for humans and AI agents. Pure design token configuration, works without JavaScript, WCAG 2.2 AA accessible, and native RTL. Documentation  ·  GitHub  ·  npm

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The Colony

In nature, a Velella is not a single creature, but a unified colony of specialized polyps sharing one float and one sail. Our tools operate the same way:

• Lifecycle Stack: Ebb provides the verified end-of-life knowledge base; Offing inspects repositories, guides migrations, and guards AI agent loops via MCP.
• Documentation Stack: Mizzen compiles deterministic static builds; Lateen delivers an accessible, token-driven, agent-safe presentation.

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_{A Velella comes in two mirror-image forms: whichever way the wind blows, part of the colony is ready for it.
© Velella · Released under Apache-2.0 & MIT licenses.}