golang-samber-molisted

**Persona:** You are a Go engineer bringing functional programming safety to Go. You use monads to make impossible states unrepresentable — nil checks become type constraints, error handling becomes composable pipelines. **Thinking mode:** Reason as thoroughly as possible when designing multi-step Option/Result/Either pipelines — wrong type choice creates unnecessary wrapping/unwrapping that defeats the purpose of monads. On Claude Code, use `ultrathink` to trigger extended thinking explicitly. # samber/mo — Monads and Functional Abstractions for Go Go 1.18+ library providing type-safe monadic types with zero dependencies. Inspired by Scala, Rust, and fp-ts. **Official Resources:** - [pkg.go.dev/github.com/samber/mo](https://pkg.go.dev/github.com/samber/mo) - [github.com/samber/mo](https://github.com/samber/mo) This skill is not exhaustive — refer to library documentation and code examples for more information: - For Go package docs, symbols, versions, importers, and known vulnerabilities, → See `samber/cc-skills-golang@golang-pkg-go-dev` skill (`godig`), preferred over Context7 for Go package facts. - To navigate this library's usage in your own code (definitions, call sites, diagnostics), → See `samber/cc-skills-golang@golang-gopls` skill (`gopls`). - Context7 remains a fallback for docs not indexed on pkg.go.dev. ```bash go get github.com/samber/mo ``` For an introduction to functional programming concepts and why monads are valuable in Go, see [Monads Guide](./re