This example composes application configuration, PromptKit configuration, PromptKit comparison and catalogs, definition and requirements inspection, and one application-owned command:

go run . config scopes
go run . config validate --scope all --campaign spring --limit=0
go run . config diff --scope app --config fixtures/before.yml --against-config fixtures/after.yml
go run . config diff --scope app --config fixtures/before.yml --against-config fixtures/after.yml --campaign spring --limit=0
go run . config diff --scope promptkit --config fixtures/before.yml --against-config fixtures/after.yml --campaign spring
go run . promptkit list prompts --config fixtures/before.yml --campaign spring
go run . promptkit list profiles --config fixtures/after.yml --campaign autumn --format yaml
go run . promptkit list backends --campaign spring
go run . promptkit list namespaces --campaign spring
go run . promptkit list collections --campaign spring
go run . promptkit list prompts --namespace field-notes --campaign spring
go run . promptkit show prompt briefing --campaign spring --format yaml
go run . promptkit show profile spring --campaign spring
go run . promptkit requirements show briefing --campaign spring
go run . promptkit requirements show briefing --campaign spring --var mode=full --format yaml
go run . promptkit requirements validate briefing --campaign spring --input topic=fixtures/topic.txt
go run . promptkit requirements validate briefing --campaign spring --input topic=fixtures/topic.txt --var mode=full --input notes=fixtures/notes.txt --format yaml
go run . promptkit requirements validate briefing --campaign spring
go run . promptkit test text_inference --campaign spring --prompt briefing --profile spring
go run . promptkit test all --campaign spring --prompt briefing --profile spring
go run . session restore session-42 --campaign spring

The sources and session store are small in-memory fixtures. --campaign is a typed selector shared by the app and PromptKit configuration scopes. Their ckconfig.Suite[*inspectionInput, *runCache] uses NewInput to initialize each selected scope's input separately and NewState to create one cache shared by that invocation's acquisitions. Prompt/profile inspection prepares its input and cache independently for its invocation, using the same application and engine loader functions. See the consumer guide and the suites' GoDoc for initialization timing and ownership.

The application-scope comparison reports the changed default campaign and the updated campaigns.spring.model. The PromptKit-scope comparison selects spring on both sides and reports the native engine change under the spring profile. The application input check requires --limit=0 when --campaign is supplied. Catalogs use the same selection-aware loader: the prompt catalog includes briefing version 1, and the profile catalog includes the selected autumn profile. Prompt inspection uses an ID only; its optional version is descriptive metadata in the report, not a selector. The synthetic field-notes collection provides one backend, profile, and prompt for collection discovery and native namespace filtering. The example's shared run cache keys successful results by the complete supplied configuration/overlay selection and the supplied campaign, including presence. The campaign override is applied through ConfigKit before loading. These are choices for this example's loader and do not define a CommandKit cache policy.

Smoke testing is explicitly wired with ckprompt.WithSmokeTesting and its optional request builder is nil, so CommandKit forwards the selected native request. Applications that need to adjust the request can provide a typed builder that starts with the seed and returns the chosen native request:

definitions = ckprompt.WithSmokeTesting(definitions, loadEngine,
	func(ctx context.Context, seed ckprompt.SmokeRequest, input *inspectionInput, state *runCache) (promptkit.SmokeTestRequest, error) {
		request := seed.Request
		request.ProfileID = "spring"
		return request, nil
	})

The example injects a small in-memory promptkit.LLMClient through its shared run state. Catalog, inspection, and requirements commands do not call it; inference smoke commands do. No model service or credentials are required. Native HTTP checks may retain unsupported or not-applicable observations because the example does not configure a network probe. An aggregate smoke command can return an operational outcome for a native diagnostic while still delivering the complete aggregate report.

The first requirements command reports incomplete discovery: PromptKit records the conditional notes input and a missing mode issue. Supplying mode=full selects that branch, classifies the undeclared notes input as required, and completes discovery. Both commands return successful reports; the result does not execute the prompt or establish input, credential, or execution readiness. See the CLI reference for the command and report contract.

The validation commands exercise concrete PromptKit request preparation. The first uses the builder's campaign-specific default topic variable and the operator's topic file. The second also selects the notes branch and supplies its file. Both succeed and report only prompt_id and valid: true; they do not execute the prompt. The final command intentionally fails because the prompt's required topic artifact is not supplied. The builder defaults variables from the selected campaign but leaves artifact bindings to the operator. The requirements show commands remain discovery reports: partial discovery can succeed even when a concrete request would fail validation.