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Build a Haskell project, interpret GHC errors, and apply safe fixes. Use when the user asks Codex to build Haskell code, fix compilation errors, or run cabal/stack build workflows.

Expert Haskell code review for idiomatic patterns, type safety, purity, error handling, and performance. Use when reviewing Haskell source files or PR changes.

Run and interpret Haskell test suites. Use when the user asks Codex to run HSpec, QuickCheck, Tasty, cabal test, stack test, or diagnose failing Haskell tests.

Effectful library conventions and decision rules. Use when writing effectful code, designing effects, or migrating from mtl.

Servant client API wrapper conventions with two-layer error handling. Use when generating HTTP clients from Servant APIs, wrapping external service APIs, or integrating servant-client with effectful.

Servant web framework conventions using NamedRoutes record pattern. Use when building REST APIs, defining endpoints, writing handlers, or structuring Servant applications.

Idiomatic Haskell conventions and decision rules. Use when writing Haskell code, designing data types, or handling errors.

Relude conventions and safe patterns. Use when setting up relude, migrating from Prelude, or working with relude-based projects.

Create an agent team for full-stack feature development. One agent writes the Haskell Servant backend API, another builds the React frontend UI consuming that API. Use when asked to "build a feature", "add a new page", "create an endpoint with UI", or "fullstack feature".

Create a new release version. Validates, tests, builds, and pushes a tagged release. Use when asked to "release", "publish", "bump version", or "create a new version".

Create a new SQLite migration file and validate database queries. Use when asked to "add a column", "create migration", "modify schema", "add database field", or "alter table".

Create an agent team for full-stack feature development. One agent writes the Haskell Servant backend API, another builds the React frontend UI consuming that API. Use when asked to "build a feature", "add a new page", "create an endpoint with UI", or "fullstack feature".