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scriptorium/docs/policy/development.md

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# Development Guide
This document defines contributor workflow for Scriptorium.
## Repository Layout
- root package `scriptorium`: public Go facade, options, types, and error mapping.
- `cmd/scriptorium`: application entrypoint.
- `internal/domain`: core contracts.
- `internal/usecase`: runner orchestration.
- `internal/adapter/cli`: CLI adapter.
- `internal/adapter/http`: HTTP adapter.
- `internal/config`: application settings loading and precedence.
- `internal/defaults`: default constants.
- `internal/promptdef`: prompt-definition repository.
- `internal/profile`: execution-profile repository.
- `internal/profile/builtin`: embedded built-in execution profiles.
- `internal/filecatalog`: shared source discovery and path helpers.
- `internal/artifact`: artifact readers.
- `internal/prompt`: prompt rendering.
- `internal/llm`: LLM client interface and OpenAI-compatible implementation.
- `internal/validate`: validation interfaces and implementation.
- `internal/format`: prepared-run formatting.
- `docs/`: canonical documentation.
- `examples/`: copyable maintained examples and fixtures.
## Common Commands
Build:
```bash
go build ./cmd/scriptorium
```
Test:
```bash
go test ./...
```
Targeted test runs commonly used during changes:
```bash
go test .
go test ./internal/adapter/cli ./internal/adapter/http ./internal/usecase
go test ./internal/...
```
## Coding Conventions
- Prefer small interfaces at package boundaries.
- Keep adapter packages focused on translation and IO concerns.
- Keep domain/use-case logic outside adapters.
- Wrap errors with operation context.
- Use strict decoding for user-provided YAML/JSON where applicable.
- Avoid introducing dependencies unless they materially reduce risk/complexity.
## Dependency Policy
- Prefer standard library unless an external library is clearly justified.
- Current non-stdlib dependencies are intentionally small:
- `gopkg.in/yaml.v3` for YAML decoding.
- `github.com/santhosh-tekuri/jsonschema/v6` for JSON Schema validation.
- Do not leak dependency-specific types across unrelated package boundaries.
## How To Add App Config Fields
1. Add fields in `internal/config/config.go` (`Config`, `AppSettings`, and/or `CLIOverrides` as needed).
2. Apply defaults in `BuiltInDefaults()` when required.
3. Parse and validate in `applyConfig` / `ApplyCLIOverrides`.
4. Wire the field through the consuming adapter(s).
5. Add/update config tests in `internal/config/config_test.go`.
6. Update canonical docs (`docs/config.md`, and other affected docs).
## How To Add CLI Flags
1. Add flags in `internal/adapter/cli/run.go` for the relevant command.
2. Ensure precedence behavior remains consistent with app config rules.
3. Keep `run`, `render`, and `serve` flag surfaces intentionally scoped.
4. Add/update parser and command tests in `internal/adapter/cli/run_test.go`.
5. Update `docs/cli.md` and any related docs/examples.
## How To Add Adapters Or Adapter Capabilities
1. Define or reuse the appropriate interface boundary in domain/use-case packages.
2. Implement adapter code under `internal/adapter/<name>` (or relevant boundary package).
3. Keep business decisions in `internal/usecase`.
4. Add focused adapter tests for mapping, parse, and error behavior.
5. Document the new/changed boundary in `docs/internal/adapters.md`.
6. If source-loading behavior changes, update `docs/internal/sources.md`.
7. If an external contract changes, update the canonical public or integration doc in the same change.
## How To Update Prompt/Profile/Schema Assets
1. Keep prompt/profile/schema files valid under strict loaders.
2. Keep examples secret-free.
3. Re-run tests that cover prompt/profile/validation behavior.
4. Update `docs/config.md` and any docs that reference changed contracts.
## Documentation Update Expectations
When behavior changes:
1. Update canonical doc locations, not duplicate files.
2. Keep non-roadmap docs limited to implemented behavior.
3. Update links after file moves/renames.
4. Re-run relevant tests and smoke commands.
5. For internal boundary docs, check references with `rg "docs/internal|internal/sources" docs/policy docs/internal`.
Docs work is complete only when code/tests/examples/docs agree.