# 35-haskell-monad-chaining

This example shows intermediate Haskell sequencing with monadic `Either` chains.

It includes:

- a rollout request parsed from compact CLI input,
- dependent resolution steps that each need earlier successful results,
- `do` notation over `Either String` for ticket, policy, tag, and approver checks, and
- a test suite run by `nix flake check`.

Useful commands:

```bash
nix develop
cabal run
cabal run -- api:production:stable:CHG-2048
cabal test

nix build
./result/bin/mini-monad-chain api:production:stable:CHG-2048

nix run . -- api:production:stable:CHG-2048
nix flake check
```