fp-go

Use this skill when making HTTP requests in fp-go using the ReaderIOResult-based HTTP client (github.com/IBM/fp-go/v2/context/readerioresult/http). Trigger on mentions of fp-go HTTP, MakeClient, MakeGetRequest, MakeRequest, ReadJSON, ReadText, ReadAll, ReadFullResponse, the HTTP request builder (WithURL, WithJSON, WithBearer, WithHeader, WithQueryArg), parallel requests with TraverseArray or TraverseTuple2, or building context-aware, composable HTTP pipelines that propagate errors through the Result monad.

Use this skill when working with lenses and optics in Go using the fp-go library (github.com/IBM/fp-go/v2/optics/lens). Trigger on mentions of lenses, optics, MakeLens, MakeLensRef, MakeLensStrict, lens composition, immutable updates to nested structs, accessing nested data structures, Compose, ComposeRef, ComposeOption, FromNillable, FromNillableRef, Modify, getter/setter patterns, or functional updates to Go structs. Also trigger when the user needs to update deeply nested fields immutably or work with optional fields in struct hierarchies. Also trigger for `// fp-go:Lens` annotation or go generate for lens code generation.

Use this skill when working with logging in fp-go functional pipelines (github.com/IBM/fp-go/v2/logging). Trigger on mentions of logging in monadic contexts, ChainFirstIOK, ChainFirst with logging, side-effect logging, structured logging (SLog), context-embedded loggers, LoggingCallbacks, TapSLog, LogEntryExit, Printf/Logf in IO/ReaderIO/ReaderIOResult, or when the user needs to add logging to functional pipelines without breaking the data flow.

Use this skill when working with the fp-go MCP (Model Context Protocol) server located in github.com/IBM/fp-go/gen/v2. Trigger on mentions of MCP server, fp-go MCP tools, list_skills, use_skill, search_examples, get_example, configuring fp-go for Claude Desktop, or when the user needs to access fp-go examples and skills programmatically. This skill explains how to configure and use the MCP server to access fp-go documentation, examples, and skills.

Guides writing, refactoring, and reviewing fp-go v2 code that uses functional composition via Pipe and Flow. Apply this skill whenever the user asks to write new fp-go code, refactor imperative Go into functional style, explain a Pipe/Flow pipeline, add do-notation (Do/Bind/ApS), use the reader monad, create lenses for struct fields, or generate unit tests for functional pipelines. Trigger on any mention of: Pipe, Flow, reader monad, kleisli, do-notation, Bind, ApS, fp-go pipeline, point-free style, lens composition in Go.

Use this skill when reviewing pull requests for fp-go code (github.com/IBM/fp-go/v2). Trigger on mentions of PR review, code review, pull request validation, fp-go best practices validation, functional programming review, or when the user asks to review changes on a PR branch. This skill validates that changes follow fp-go conventions including data-last composition, point-free style, proper monad usage, lens patterns, and idiomatic functional patterns.

Use this skill whenever writing, reviewing, or refactoring Go code that uses the fp-go library (github.com/IBM/fp-go/v2). Trigger on any mention of fp-go, functional programming in Go, monads in Go, Option/Either/Result types in Go, IOResult, ReaderIOResult, data-last composition, Pipe/Flow, or do-notation with Bind/ApS in Go. Also trigger when the user wants to convert idiomatic Go error handling into functional pipelines, or asks about optics (lens, prism, traversal) in Go.