Develop with Gleam using idiomatic patterns, TDD, and type-driven design. Activate when working with .gleam files, gleam.toml, or user mentions Gleam, BEAM, or Erlang.
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---
name: gleam
description: "Develop with Gleam using idiomatic patterns, TDD, and type-driven design. Activate when working with .gleam files, gleam.toml, or user mentions Gleam, BEAM, or Erlang."
---
# Gleam Development
Idiomatic Gleam with **type-driven design** and **TDD**.
## Workflow
```
1. MODEL → Define domain types first (make illegal states unrepresentable)
2. RED → Write failing test
3. GREEN → Minimal implementation
4. REFACTOR → Clean up, use pipelines
5. RUN → gleam test && gleam run
```
## Research
Use Context7 `query-docs` first, then gh as fallback. Routing table and example queries live in `reference.md`.
## CLI
```bash
gleam check # Fast type feedback (use often)
gleam test # Run tests
gleam run # Execute main
gleam format # Format all
gleam add pkg --dev # Dev dependency
```
## References
- [reference.md](reference.md) - Research routing, patterns, anti-patterns
