# Command line reference CommandKit owns command routing and syntax for commands registered with its `App`. The caller supplies argv without the executable name, a context, and the output and diagnostic writers. `App.Execute` returns an `Outcome`; it does not exit the process. ## Help The root help command lists registered commands and their summaries. Help is available through a bare invocation, `--help`, `-h`, and `help`: ```text example example --help example -h example help example help config show example config --help ``` `help [COMMAND...]` resolves an exact registered path. A command group without an execution handler displays its help when invoked by itself. A runnable command with children runs its handler when invoked without help; add `--help` to inspect that command and its children. Help uses registered descriptions, command summaries, local flags, defaults, required and repeatable flag metadata, and operand names and counts. It does not construct the selected command's input or invoke its handler. Supplied flag and operand values are still parsed so malformed values and unknown flags remain usage errors. Missing execution-required values and input-combination checks are skipped for help. ## Version `version` reports the application identity by default: ```text example version example version --scope commandkit example version --format yaml ``` The supported flags are: | Flag | Values | Default | Meaning | | --- | --- | --- | --- | | `--scope` | `app`, `commandkit` | `app` | Select the caller's application identity or the embedded CommandKit module identity. | | `--format` | `text`, `yaml` | `text` | Select the output format. | Text output is `NAME VERSION`, followed by ` (REVISION)` when the selected identity has a revision. An empty application version is displayed as `dev`; the revision remains empty when omitted. CommandKit identity uses the version of its module in build information. A versioned module replacement supplies the effective version. A local or versionless replacement, an untagged module, or missing build information displays `dev`. The CommandKit identity name is `CommandKit`; dependency build metadata does not supply a revision. YAML output uses these explicit fields, including an empty revision: ```yaml name: ExampleApp version: dev revision: "" ``` ## Registered command syntax Options are parsed after the complete command path and may be interspersed with declared operands. Flags are local to the selected command. Use `--` to end option parsing; all later tokens are operands. Value flags accept `--name value` and `--name=value`. Boolean flags accept presence as true and explicit values such as `--enabled=false`. A singleton flag accepts repeated occurrences; the last successfully parsed occurrence supplies its value. Every supplied occurrence is converted, so an earlier malformed value remains an error. Repeatable flags preserve occurrence order, with each occurrence treated as one value, including strings containing commas. Typed inputs keep supplied state separate from defaults. An explicit empty, false, or zero value is supplied. Help and version are available without constructing application command inputs. ## Configuration scopes An application installs one configuration suite with `RegisterConfig`. Its `config scopes` command lists scope names and the configuration operations currently installed for those scopes: ```text example config scopes example config scopes --format yaml ``` Text output uses one `scope: operation, operation` line per scope. YAML uses a `scopes` sequence with explicit `name` and `operations` fields. Scope order is `app`, then `promptkit`, then other names alphabetically. A metadata-only scope can be listed without an acquisition callback. Discovery does not construct a runtime context or acquire configuration. It reports the intersection between declared scope capabilities and installed handlers, so an operation is listed only when the corresponding command is available. ### Validate configuration `config validate` loads and validates the selected scope. The default scope is `app`; `--scope all` validates every registered scope and is available when each scope declares validation. The command checks all selected capabilities before calling scope providers. Its default format is text; `--format yaml` emits a `scopes` sequence with `name` and `valid: true` for each scope that completed successfully. ```text example config validate example config validate --scope promptkit --format yaml example config validate --scope all ``` Each successful scope is reported as `SCOPE: valid`. Aggregate validation stops at the first load or output failure; records from earlier successful scopes may already have been written. Provider warnings go to the diagnostic stream and do not alone make validation fail. `--config` and `--overlay` preserve whether an empty value was explicitly supplied, so a scope callback can map those inputs to its own ConfigKit load policy. Help and invalid syntax do not call scope providers. ### Show effective configuration `config show` writes the provider's native effective YAML for one scope. Its default scope is `app`; `--format yaml` is accepted and YAML is the only initial format. Single-scope output is passed through unchanged, without a CommandKit header or document marker. ```text example config show example config show --scope promptkit example config show --scope all ``` `--scope all` acquires every selected scope and checks each effective writer before writing output. It then emits one YAML document per scope in discovery order, with a `# scope: NAME` comment after each document marker. Existing native markers and leading comments are retained; documents without a marker receive one. Scope labels containing line control characters are quoted to keep them on one comment line. A provider failure leaves the output stream empty. A rendering or output failure may leave an aggregate prefix, and the outcome reports incomplete report delivery. ## Outcome status CommandKit usage failures use status `2`; operational failures use status `1`. Successful operations use status `0`. Application handlers may return a domain classification and status of their choice, which `Execute` preserves. The caller chooses how to map an outcome to process exit.