commandkit/docs/internal/overview.md

# Internal package overview

CommandKit ships one public package, `commandkit`, and one internal package,
`internal/cobra`. This inventory describes the current implementation; the
[architecture policy](../policy/architecture.md) owns normative boundaries and
[ADR 0003](../adr/0003-public-facade.md) records the original facade decision.
[ADR 0010](../adr/0010-optional-integration-modules.md) now scopes that decision to
the core and optional integrations; the [module roadmap](../roadmap/modules.md)
tracks the pending transition. The inventory below describes the prototype.

## `commandkit`

The root package declares the public API and owns the instance registry, typed
command input preparation, invocation coordination, standard handlers, and
provider adapters. Configuration reports adapt ConfigKit's public records and
writers. PromptKit scope and definition handlers use PromptKit's public
inspection methods and map their results to CommandKit-owned reports.

The root lazily caches one immutable neutral bridge tree per `App`, invalidating
it after successful nonempty registration. For each `Execute`, it prepares one
adapter session and reuses that session for parsing, help, and usage. If a
callback registers commands during execution, metadata-dependent presentation
refreshes without repeating input callbacks. The root still prepares typed
input, invokes application/standard handlers, and coordinates outcomes and
diagnostic delivery. Application callbacks and their supported error identity
are handled in the root through its typed contracts.

Configuration registration owns and normalizes its declarations, then prepares
ordered scopes, name lookup, installed operations, and a discovery DTO. Command
handlers reuse that private metadata; each invocation still creates its context
and invokes acquisition only for selected scopes.

## `internal/cobra`

This package owns the Cobra-specific command tree, argument/flag parsing,
and help rendering. A session owns one mutable backend tree for an invocation;
parsing and presentation reuse it. Backend commands map directly to neutral
declarations, and Cobra parent links reconstruct only the selected command path.
The adapter returns raw parsed values and neutral syntax-failure data consumed
by the root package. It does not import `commandkit` and does not own registry
policy, public command declarations, provider loading, or standard inspection
report rendering.

## External implementation boundaries

ConfigKit owns typed configuration loading, source history, validation,
resolution, and path explanations. PromptKit owns captured engine
configuration, prompt definitions, profile inheritance, and named inspections.
CommandKit depends on their public module APIs and does not maintain parallel
schemas. Cobra and pflag are confined behind the internal adapter; YAML report
encoding is performed by the root package.