diff --git a/bundled_composition_contract_test.go b/bundled_composition_contract_test.go
index 659a524..8b47b04 100644
--- a/bundled_composition_contract_test.go
+++ b/bundled_composition_contract_test.go
@@ -19,7 +19,7 @@ func TestBundledCompositionReplacementAndInheritance(t *testing.T) {
 		t.Fatal(err)
 	}
 	underlayProfile, err := underlayEngine.InspectProfile(context.Background(), "gpt-sol-latest")
-	if err != nil || underlayProfile.EffectiveModelParams.Model != "underlay-model" || underlayProfile.EffectiveModelParams.BackendID != "" {
+	if err != nil || underlayProfile.Model == nil || *underlayProfile.Model != "underlay-model" || underlayProfile.Backend != nil {
 		t.Fatalf("underlay replacement = %+v, %v", underlayProfile, err)
 	}
 	main := configkit.Input{Source: configkit.Mapping("caller main", map[string]any{
@@ -38,29 +38,29 @@ func TestBundledCompositionReplacementAndInheritance(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	inspect := func(id string) promptkit.ExecutionTarget {
+	inspect := func(id string) *promptkit.ProfileInspection {
 		t.Helper()
 		profile, err := engine.InspectProfile(context.Background(), id)
 		if err != nil {
 			t.Fatal(err)
 		}
-		return profile.EffectiveModelParams
+		return profile
 	}
-	if target := inspect("gpt-sol-latest"); target.Model != "main-model" || target.BackendID != "" {
+	if target := inspect("gpt-sol-latest"); target.Model == nil || *target.Model != "main-model" || target.Backend != nil {
 		t.Fatalf("replacement = %+v", target)
 	}
-	if target := inspect("custom"); target.Model != "custom-model" || target.BackendID != "openrouter" || target.Endpoint != "https://local.invalid/v1" {
+	if target := inspect("custom"); target.Model == nil || *target.Model != "custom-model" || target.Backend == nil || *target.Backend != "openrouter" || target.Endpoint != nil {
 		t.Fatalf("inherited = %+v", target)
 	}
-	if target := inspect("gpt-luna-latest"); target.Endpoint != "https://local.invalid/v1" || target.APIKeyEnv != "" {
-		t.Fatalf("backend replacement = %+v", target)
+	if backend, err := engine.InspectBackend(context.Background(), "openrouter"); err != nil || backend.Endpoint != "https://local.invalid/v1" || backend.APIKeyEnv != nil {
+		t.Fatalf("backend replacement = %+v, %v", backend, err)
 	}
-	if target := inspect("openrouter/profile"); target.BackendID != "openrouter/local" || target.Model != "collection-model" {
+	if target := inspect("openrouter/profile"); target.Backend == nil || *target.Backend != "openrouter/local" || target.Model == nil || *target.Model != "collection-model" {
 		t.Fatalf("collection = %+v", target)
 	}
 	target := inspect("auto-low")
 	wantPlugins := map[string]any{"plugins": []any{map[string]any{"id": "auto-router", "cost_tier": "low"}}}
-	if target.BackendID != "other" || target.Model != "other-model" || !reflect.DeepEqual(target.ExtraParams, wantPlugins) {
+	if target.Backend == nil || *target.Backend != "other" || target.Model == nil || *target.Model != "other-model" || target.ExtraParams == nil || !reflect.DeepEqual(*target.ExtraParams, wantPlugins) {
 		t.Errorf("inherited tier = %+v", target)
 	}
 }
diff --git a/bundled_openrouter_contract_test.go b/bundled_openrouter_contract_test.go
index ed64c04..2ee9df4 100644
--- a/bundled_openrouter_contract_test.go
+++ b/bundled_openrouter_contract_test.go
@@ -59,7 +59,7 @@ func TestBundledOpenRouterOptionsAndInventory(t *testing.T) {
 					t.Fatalf("bundle inventory: %v %v", profiles, backends)
 				}
 				profile, err := engine.InspectProfile(context.Background(), "auto")
-				if err != nil || profile.EffectiveModelParams.BackendID != "openrouter" {
+				if err != nil || profile.Backend == nil || *profile.Backend != "openrouter" {
 					t.Fatalf("bundle profile = %+v, %v", profile, err)
 				}
 				view, err := engine.InspectConfiguration()
diff --git a/configuration_sources_test.go b/configuration_sources_test.go
index da476fd..5350d5b 100644
--- a/configuration_sources_test.go
+++ b/configuration_sources_test.go
@@ -58,7 +58,7 @@ func TestCollectionInputLoadsNativeImportsAndLaterOverride(t *testing.T) {
 		t.Fatalf("construct engine with native collection import: %v", err)
 	}
 	inspection, err := engine.InspectPrompt(context.Background(), "docs/greeting")
-	if err != nil || inspection.PromptID != "docs/greeting" || len(inspection.Inputs) != 1 || inspection.Inputs[0].Name != "overridden" {
+	if err != nil || inspection.PromptID != "docs/greeting" || inspection.Inputs == nil || len(*inspection.Inputs) != 1 || (*inspection.Inputs)[0].Name != "overridden" {
 		t.Fatalf("inspect imported and overlaid prompt = (%+v, %v)", inspection, err)
 	}
 }
@@ -85,7 +85,7 @@ func TestCollectionInputLoadsEmbeddedImportsAndLaterOverride(t *testing.T) {
 		t.Fatalf("construct engine with embedded collection import: %v", err)
 	}
 	inspection, err := engine.InspectPrompt(context.Background(), "docs/greeting")
-	if err != nil || inspection.PromptID != "docs/greeting" || len(inspection.Inputs) != 1 || inspection.Inputs[0].Name != "overridden" {
+	if err != nil || inspection.PromptID != "docs/greeting" || inspection.Inputs == nil || len(*inspection.Inputs) != 1 || (*inspection.Inputs)[0].Name != "overridden" {
 		t.Fatalf("inspect imported and overlaid prompt = (%+v, %v)", inspection, err)
 	}
 }
diff --git a/construction_contract_test.go b/construction_contract_test.go
index bf73475..74e7095 100644
--- a/construction_contract_test.go
+++ b/construction_contract_test.go
@@ -134,7 +134,7 @@ func TestFormerCatalogBackendIDsWorkWhenConfigured(t *testing.T) {
 		"rakestrawhome-profile": rakestrawhomeID,
 	} {
 		inspection, err := engine.InspectProfile(context.Background(), profileID)
-		if err != nil || inspection.EffectiveModelParams.BackendID != backendID {
+		if err != nil || inspection.Backend == nil || *inspection.Backend != backendID {
 			t.Fatalf("inspect %q = (%+v, %v), want backend %q", profileID, inspection, err, backendID)
 		}
 	}
@@ -242,8 +242,9 @@ func TestPublicConstructionUsesProgrammaticBackendAndProfileSources(t *testing.T
 	if err != nil {
 		t.Fatalf("inspect configured profile: %v", err)
 	}
-	if inspection.EffectiveModelParams.Endpoint != endpoint {
-		t.Fatalf("effective endpoint = %q, want %q", inspection.EffectiveModelParams.Endpoint, endpoint)
+	backendInspection, err := engine.InspectBackend(context.Background(), backendID)
+	if err != nil || inspection.Endpoint != nil || backendInspection.Endpoint != endpoint {
+		t.Fatalf("profile/backend = %+v / %+v, %v", inspection, backendInspection, err)
 	}
 }
 
diff --git a/docs/roadmap/implementation.md b/docs/roadmap/implementation.md
index 4923c35..00731a8 100644
--- a/docs/roadmap/implementation.md
+++ b/docs/roadmap/implementation.md
@@ -376,6 +376,10 @@ cancellation remains detectable through `errors.Is`.
 
 ## Stage 6: Retire Superseded Inspection Paths And Migrate Existing Tests
 
+**Completed:** Removed superseded runner inspection wrappers, migrated public
+consumers and the preparation example, and retained target and requirement
+coverage at their owning seams. The full ordinary `go test ./...` suite passes.
+
 **Scope:** Existing consumers and test ownership, without losing execution or
 requirement coverage.
 
diff --git a/examples/go-library/prepare/main.go b/examples/go-library/prepare/main.go
index fe2b979..7fbb5de 100644
--- a/examples/go-library/prepare/main.go
+++ b/examples/go-library/prepare/main.go
@@ -110,10 +110,10 @@ func run(ctx context.Context, exampleDir string, out io.Writer) error {
 	if err != nil {
 		return err
 	}
-	if profile.EffectiveModelParams.TimeoutSeconds != 30 {
+	if profile.TimeoutSeconds == nil || *profile.TimeoutSeconds != 30 {
 		return fmt.Errorf(
-			"later profile override was not applied: timeout is %d seconds",
-			profile.EffectiveModelParams.TimeoutSeconds,
+			"later profile override was not applied: timeout is %v",
+			profile.TimeoutSeconds,
 		)
 	}
 	namespaces, err := scoped.ListNamespaces(ctx)
@@ -156,7 +156,7 @@ func run(ctx context.Context, exampleDir string, out io.Writer) error {
 		SelectedProfile: prepared.SelectedProfileID,
 		Model:           prepared.EffectiveModelParams.Model,
 		MessageCount:    len(prepared.Messages),
-		ProfileTimeout:  profile.EffectiveModelParams.TimeoutSeconds,
+		ProfileTimeout:  *profile.TimeoutSeconds,
 		Namespaces:      namespaces,
 		Collections:     collectionSummaries,
 		ScopedPrompts:   scopedPromptIDs,
diff --git a/internal/domain/domain.go b/internal/domain/domain.go
index 95b21d3..17e09a2 100644
--- a/internal/domain/domain.go
+++ b/internal/domain/domain.go
@@ -239,13 +239,6 @@ type ExecutionTarget struct {
 	ExtraParams     map[string]any `yaml:"extra_params" json:"extra_params"`
 }
 
-// ProfileInspection is the resolved result of exact profile inspection.
-type ProfileInspection struct {
-	ProfileID            string
-	EffectiveModelParams ExecutionTarget
-	APIKeyRequired       bool
-}
-
 // OutputContract defines the requirements for the output artifact.
 type OutputContract struct {
 	Format         OutputFormat   `yaml:"format"`
diff --git a/internal/usecase/profile_fixture_test.go b/internal/usecase/profile_fixture_test.go
new file mode 100644
index 0000000..ae14e49
--- /dev/null
+++ b/internal/usecase/profile_fixture_test.go
@@ -0,0 +1,38 @@
+package usecase
+
+import (
+	"context"
+
+	"go.maximumdirect.net/promptkit/internal/domain"
+	"go.maximumdirect.net/promptkit/internal/jsonvalue"
+)
+
+type inspectionProfileRepository struct {
+	profile *domain.ExecutionProfile
+	err     error
+	calls   int
+	id      string
+}
+
+func (r *inspectionProfileRepository) GetProfile(_ context.Context, id string) (*domain.ExecutionProfile, error) {
+	r.calls++
+	r.id = id
+	if r.err != nil {
+		return nil, r.err
+	}
+	if r.profile == nil {
+		return nil, nil
+	}
+	profile := *r.profile
+	if profile.ResolvedTarget != nil {
+		target := *profile.ResolvedTarget
+		target.ExtraParams = jsonvalue.CloneTrusted(target.ExtraParams).(map[string]any)
+		profile.ResolvedTarget = &target
+	}
+	return &profile, nil
+}
+
+func (r *inspectionProfileRepository) GetProfileIdentity(ctx context.Context, id string) (string, error) {
+	_, err := r.GetProfile(ctx, id)
+	return id, err
+}
diff --git a/internal/usecase/profile_inspection.go b/internal/usecase/profile_inspection.go
index 1907053..e587bb6 100644
--- a/internal/usecase/profile_inspection.go
+++ b/internal/usecase/profile_inspection.go
@@ -85,30 +85,3 @@ func normalizeResolvedExecutionSettings(target domain.ExecutionTarget) (domain.E
 	}
 	return target, nil
 }
-
-// InspectProfile resolves one explicit profile without prompt or execution work.
-func (r *Runner) InspectProfile(
-	ctx context.Context,
-	profileID string,
-) (*domain.ProfileInspection, error) {
-	if strings.TrimSpace(profileID) == "" {
-		return nil, fmt.Errorf("%w: profile id is required", ErrInvalidRequest)
-	}
-	select {
-	case <-ctx.Done():
-		return nil, &OperationError{Category: ErrProfileLoad, Cause: ctx.Err()}
-	default:
-	}
-
-	selection, err := r.resolveProfileSelection(ctx, profileID)
-	if err != nil {
-		return nil, err
-	}
-	target, _ := resolveExecutionTarget(selection.profile, nil)
-	target.APIKey = ""
-	return &domain.ProfileInspection{
-		ProfileID:            selection.id,
-		EffectiveModelParams: target,
-		APIKeyRequired:       target.APIKeyRequired,
-	}, nil
-}
diff --git a/internal/usecase/profile_inspection_test.go b/internal/usecase/profile_inspection_test.go
deleted file mode 100644
index 9f8134b..0000000
--- a/internal/usecase/profile_inspection_test.go
+++ /dev/null
@@ -1,105 +0,0 @@
-package usecase
-
-import (
-	"context"
-	"errors"
-	"reflect"
-	"testing"
-
-	"go.maximumdirect.net/promptkit/internal/domain"
-	"go.maximumdirect.net/promptkit/internal/jsonvalue"
-	"go.maximumdirect.net/promptkit/internal/profile"
-)
-
-type inspectionProfileRepository struct {
-	profile *domain.ExecutionProfile
-	err     error
-	calls   int
-	id      string
-}
-
-func (r *inspectionProfileRepository) GetProfile(_ context.Context, id string) (*domain.ExecutionProfile, error) {
-	r.calls++
-	r.id = id
-	if r.err != nil {
-		return nil, r.err
-	}
-	if r.profile == nil {
-		return nil, nil
-	}
-	profile := *r.profile
-	if profile.ResolvedTarget != nil {
-		target := *profile.ResolvedTarget
-		target.ExtraParams = jsonvalue.CloneTrusted(target.ExtraParams).(map[string]any)
-		profile.ResolvedTarget = &target
-	}
-	return &profile, nil
-}
-
-func (r *inspectionProfileRepository) GetProfileIdentity(ctx context.Context, id string) (string, error) {
-	_, err := r.GetProfile(ctx, id)
-	return id, err
-}
-
-func TestRunnerInspectProfileUsesExactSnapshotAndCopiesTarget(t *testing.T) {
-	configured := domain.ExecutionTarget{
-		BackendID: "backend", Endpoint: "https://backend.example/v1", Model: "model",
-		Temperature: 0, APIKeyEnv: "OPTIONAL_KEY", ExtraParams: map[string]any{"nested": map[string]any{"value": "original"}},
-	}
-	profiles := &inspectionProfileRepository{profile: &domain.ExecutionProfile{
-		ID: "  literal  ", ResolvedTarget: &configured,
-		TargetPresence: domain.ExecutionTargetPresence{Temperature: true},
-	}}
-	runner := &Runner{profiles: profiles}
-	first, err := runner.InspectProfile(context.Background(), "  literal  ")
-	if err != nil {
-		t.Fatalf("inspect exact ID: %v", err)
-	}
-	if profiles.calls != 1 || profiles.id != "  literal  " || first.ProfileID != profiles.id || !reflect.DeepEqual(first.EffectiveModelParams, configured) {
-		t.Fatalf("inspection=%+v lookup=(%d,%q), want exact snapshot", first, profiles.calls, profiles.id)
-	}
-	first.EffectiveModelParams.ExtraParams["nested"].(map[string]any)["value"] = "changed"
-	second, err := runner.InspectProfile(context.Background(), "  literal  ")
-	if err != nil || second.EffectiveModelParams.ExtraParams["nested"].(map[string]any)["value"] != "original" {
-		t.Fatalf("inspection mutated snapshot: (%+v, %v)", second, err)
-	}
-}
-
-func TestRunnerInspectProfileDoesNotNeedExecutionCollaboratorsOrCredentials(t *testing.T) {
-	t.Setenv("PROMPTKIT_INSPECTION_TEST_KEY", "")
-	profiles := &inspectionProfileRepository{profile: &domain.ExecutionProfile{
-		ID: "endpoint-only", ResolvedTarget: &domain.ExecutionTarget{
-			Endpoint: "https://profile.example/v1", Model: "profile-model", APIKeyEnv: "PROMPTKIT_INSPECTION_TEST_KEY",
-		},
-	}}
-	inspection, err := (&Runner{profiles: profiles}).InspectProfile(context.Background(), "endpoint-only")
-	if err != nil || inspection.EffectiveModelParams.APIKeyEnv != "PROMPTKIT_INSPECTION_TEST_KEY" || inspection.APIKeyRequired {
-		t.Fatalf("unexpected endpoint-only inspection: (%+v, %v)", inspection, err)
-	}
-}
-
-func TestRunnerInspectProfileClassifiesLookupFailures(t *testing.T) {
-	profiles := &inspectionProfileRepository{}
-	runner := &Runner{profiles: profiles}
-	if _, err := runner.InspectProfile(context.Background(), " \t "); !errors.Is(err, ErrInvalidRequest) || profiles.calls != 0 {
-		t.Fatalf("blank inspection=(%v, calls=%d)", err, profiles.calls)
-	}
-	ctx, cancel := context.WithCancel(context.Background())
-	cancel()
-	if _, err := runner.InspectProfile(ctx, "profile"); !errors.Is(err, ErrProfileLoad) || !errors.Is(err, context.Canceled) || profiles.calls != 0 {
-		t.Fatalf("canceled inspection=(%v, calls=%d)", err, profiles.calls)
-	}
-	profiles.err = profile.ErrProfileNotFound
-	if _, err := runner.InspectProfile(context.Background(), "missing"); !errors.Is(err, ErrProfileLoad) || !errors.Is(err, profile.ErrProfileNotFound) {
-		t.Fatalf("missing profile error=%v", err)
-	}
-	for _, invalid := range []*Runner{
-		{},
-		{profiles: &inspectionProfileRepository{}},
-		{profiles: &inspectionProfileRepository{profile: &domain.ExecutionProfile{ID: "profile"}}},
-	} {
-		if _, err := invalid.InspectProfile(context.Background(), "profile"); !errors.Is(err, ErrProfileLoad) {
-			t.Fatalf("invalid dependency error=%v", err)
-		}
-	}
-}
diff --git a/internal/usecase/prompt_inspection.go b/internal/usecase/prompt_inspection.go
index 6019306..147be72 100644
--- a/internal/usecase/prompt_inspection.go
+++ b/internal/usecase/prompt_inspection.go
@@ -48,17 +48,3 @@ func (r *Runner) resolvePromptInspection(ctx context.Context, promptID string) (
 	}
 	return inspection, nil
 }
-
-// InspectPrompt resolves one explicit prompt without execution work.
-func (r *Runner) InspectPrompt(ctx context.Context, promptID string) (*domain.PromptInspection, error) {
-	if strings.TrimSpace(promptID) == "" {
-		return nil, fmt.Errorf("%w: prompt id is required", ErrInvalidRequest)
-	}
-	select {
-	case <-ctx.Done():
-		return nil, &OperationError{Category: ErrPromptLoad, Cause: ctx.Err()}
-	default:
-	}
-
-	return r.resolvePromptInspection(ctx, promptID)
-}
diff --git a/internal/usecase/prompt_inspection_test.go b/internal/usecase/prompt_inspection_test.go
deleted file mode 100644
index 5e21b33..0000000
--- a/internal/usecase/prompt_inspection_test.go
+++ /dev/null
@@ -1,218 +0,0 @@
-package usecase
-
-import (
-	"context"
-	"errors"
-	"reflect"
-	"testing"
-
-	"go.maximumdirect.net/promptkit/internal/domain"
-	"go.maximumdirect.net/promptkit/internal/prompt"
-	"go.maximumdirect.net/promptkit/internal/promptdef"
-)
-
-type inspectionPromptRepository struct {
-	definition *domain.PromptDefinition
-	err        error
-	calls      int
-	id         string
-}
-
-type promptMetadataRepository struct {
-	inspection    domain.PromptInspection
-	inspectionErr error
-	lookupID      string
-}
-
-func (r *inspectionPromptRepository) GetPromptSnapshot(
-	_ context.Context,
-	id string,
-) (*domain.PromptDefinition, string, error) {
-	r.calls++
-	r.id = id
-	if r.err != nil {
-		return nil, "", r.err
-	}
-	return r.definition, "captured-hash", nil
-}
-
-func (r *inspectionPromptRepository) GetPromptInspection(ctx context.Context, id string) (*domain.PromptInspection, error) {
-	definition, hash, err := r.GetPromptSnapshot(ctx, id)
-	return fixturePromptInspection(definition, hash), err
-}
-
-func (*inspectionPromptRepository) GetRequirementSnapshot(string) (prompt.RequirementSnapshot, bool) {
-	return prompt.RequirementSnapshot{}, false
-}
-
-func (r *promptMetadataRepository) GetPromptSnapshot(context.Context, string) (*domain.PromptDefinition, string, error) {
-	return nil, "", errors.New("full prompt definition should not be requested")
-}
-
-func (*promptMetadataRepository) GetRequirementSnapshot(string) (prompt.RequirementSnapshot, bool) {
-	return prompt.RequirementSnapshot{}, false
-}
-
-func (r *promptMetadataRepository) GetPromptInspection(
-	_ context.Context,
-	id string,
-) (*domain.PromptInspection, error) {
-	r.lookupID = id
-	inspection := r.inspection
-	inspection.Inputs = append([]domain.PromptInput(nil), inspection.Inputs...)
-	return &inspection, r.inspectionErr
-}
-
-func TestRunnerInspectPromptResolvesOneDefinitionWithoutExecutionCollaborators(t *testing.T) {
-	definition := &domain.PromptDefinition{
-		ID:             "normalized.prompt",
-		DefaultProfile: "not-resolved",
-		Inputs: []domain.PromptInput{
-			{Name: "document", Required: true, ContentType: "text/plain", Description: "Source document."},
-			{Name: "audience", ContentType: "text/plain", Description: "Intended reader."},
-		},
-		Validation: domain.OutputContract{
-			Format:         domain.FormatJSON,
-			ValidationMode: domain.ValidationJSONSchema,
-			SchemaPath:     "schemas/result.json",
-			RepairAttempts: 2,
-		},
-	}
-	repository := &inspectionPromptRepository{definition: definition}
-	runner := &Runner{promptDefs: repository}
-
-	inspection, err := runner.InspectPrompt(context.Background(), " prompt-id ")
-	if err != nil {
-		t.Fatalf("inspect prompt: %v", err)
-	}
-	if repository.calls != 1 || repository.id != " prompt-id " {
-		t.Fatalf("prompt lookup=(calls=%d id=%q), want one unchanged ID lookup", repository.calls, repository.id)
-	}
-	if inspection.PromptID != definition.ID ||
-		inspection.PromptHash != "captured-hash" ||
-		inspection.DefaultProfileID != definition.DefaultProfile ||
-		!reflect.DeepEqual(inspection.Inputs, definition.Inputs) ||
-		inspection.OutputContract != definition.Validation {
-		t.Fatalf("inspection=%#v, want definition metadata", inspection)
-	}
-
-	inspection.Inputs[0].Name = "changed"
-	second, err := runner.InspectPrompt(context.Background(), " prompt-id ")
-	if err != nil {
-		t.Fatalf("inspect prompt again: %v", err)
-	}
-	if definition.Inputs[0].Name != "document" || second.Inputs[0].Name != "document" {
-		t.Fatalf("inspection input mutation escaped caller result: definition=%#v next=%#v", definition.Inputs, second.Inputs)
-	}
-}
-
-func TestRunnerInspectPromptUsesOwnedCapturedMetadata(t *testing.T) {
-	repository := &promptMetadataRepository{inspection: domain.PromptInspection{
-		PromptID: "captured.prompt", PromptHash: "cached-prompt-hash",
-		DefaultProfileID: "partial-profile",
-		Inputs:           []domain.PromptInput{{Name: "document", Required: true, ContentType: "text/plain", Description: "Captured."}},
-		OutputContract:   domain.OutputContract{Format: domain.FormatJSON, ValidationMode: domain.ValidationJSON},
-	}}
-	runner := &Runner{promptDefs: repository}
-	inspection, err := runner.InspectPrompt(context.Background(), " requested-id ")
-	if err != nil || repository.lookupID != " requested-id " ||
-		inspection.PromptID != "captured.prompt" ||
-		inspection.PromptHash != "cached-prompt-hash" || inspection.DefaultProfileID != "partial-profile" ||
-		!reflect.DeepEqual(inspection.Inputs, repository.inspection.Inputs) || inspection.OutputContract != repository.inspection.OutputContract {
-		t.Fatalf("metadata inspection=(%+v, %v), lookup=%q", inspection, err, repository.lookupID)
-	}
-	inspection.Inputs[0].Name = "caller mutation"
-	inspection.OutputContract.SchemaPath = "caller mutation"
-	second, err := runner.InspectPrompt(context.Background(), "requested-id")
-	if err != nil || second.Inputs[0].Name != "document" || second.OutputContract.SchemaPath != "" {
-		t.Fatalf("metadata inspection was not caller-owned: (%+v, %v)", second, err)
-	}
-}
-
-func TestRunnerInspectPromptUsesCapturedHashAndMetadata(t *testing.T) {
-	repository := &requirementInspectionPromptRepository{
-		definition: &domain.PromptDefinition{
-			ID: "captured.prompt", Inputs: []domain.PromptInput{{Name: "document"}},
-		},
-	}
-	inspection, err := (&Runner{promptDefs: repository}).InspectPrompt(context.Background(), " requested-id ")
-	if err != nil || inspection.PromptID != "captured.prompt" ||
-		inspection.PromptHash != "captured-hash" || inspection.Inputs[0].Name != "document" {
-		t.Fatalf("captured inspection=(%+v, %v)", inspection, err)
-	}
-}
-
-func TestRunnerInspectPromptClassifiesFailuresWithoutRepositoryWorkAfterCancellation(t *testing.T) {
-	t.Run("blank ID", func(t *testing.T) {
-		repository := &inspectionPromptRepository{}
-		_, err := (&Runner{promptDefs: repository}).InspectPrompt(context.Background(), " \t ")
-		if !errors.Is(err, ErrInvalidRequest) || repository.calls != 0 {
-			t.Fatalf("blank inspection=(%v, calls=%d), want invalid request without lookup", err, repository.calls)
-		}
-	})
-
-	t.Run("canceled context", func(t *testing.T) {
-		ctx, cancel := context.WithCancel(context.Background())
-		cancel()
-		repository := &inspectionPromptRepository{}
-		_, err := (&Runner{promptDefs: repository}).InspectPrompt(ctx, "prompt")
-		if !errors.Is(err, ErrPromptLoad) || !errors.Is(err, context.Canceled) || repository.calls != 0 {
-			t.Fatalf("canceled inspection=(%v, calls=%d), want prompt load and context identities without lookup", err, repository.calls)
-		}
-	})
-
-	t.Run("missing prompt", func(t *testing.T) {
-		repository := &inspectionPromptRepository{err: promptdef.ErrPromptDefinitionNotFound}
-		_, err := (&Runner{promptDefs: repository}).InspectPrompt(context.Background(), "missing")
-		if !errors.Is(err, ErrPromptLoad) || !errors.Is(err, promptdef.ErrPromptDefinitionNotFound) {
-			t.Fatalf("missing prompt error=%v, want prompt load and not-found identities", err)
-		}
-	})
-
-	t.Run("defensive prompt dependencies", func(t *testing.T) {
-		var nilRunner *Runner
-		cases := []struct {
-			name   string
-			runner *Runner
-		}{
-			{name: "nil runner", runner: nilRunner},
-			{name: "nil repository", runner: &Runner{}},
-			{name: "nil definition", runner: &Runner{promptDefs: &inspectionPromptRepository{}}},
-		}
-		for _, tc := range cases {
-			t.Run(tc.name, func(t *testing.T) {
-				_, err := tc.runner.InspectPrompt(context.Background(), "prompt")
-				if !errors.Is(err, ErrPromptLoad) {
-					t.Fatalf("inspection error=%v, want prompt load", err)
-				}
-			})
-		}
-	})
-}
-
-func TestRunnerPrepareUsesThePromptInspectionSelectionAndHash(t *testing.T) {
-	definition := promptDef(domain.FormatMarkdown, domain.ValidationBasic, 0)
-	repository := &fakePromptRepo{def: definition}
-	runner := NewRunner(
-		repository,
-		&fakeExecutionProfileRepo{profiles: map[string]*domain.ExecutionProfile{"exec": defaultExecutionProfile()}},
-
-		&fakeArtifactReader{},
-		&fakeRenderer{rendered: &domain.RenderedPrompt{Messages: []domain.RenderedMessage{{Role: "user", Content: "hello"}}}},
-		nil,
-		nil,
-		nil,
-	)
-
-	inspection, err := runner.InspectPrompt(context.Background(), definition.ID)
-	if err != nil {
-		t.Fatalf("inspect prompt: %v", err)
-	}
-	prepared, err := runner.Prepare(context.Background(), domain.RunRequest{PromptID: definition.ID, ProfileID: "exec"})
-	if err != nil {
-		t.Fatalf("prepare prompt: %v", err)
-	}
-	if inspection.PromptHash != prepared.PromptHash {
-		t.Fatalf("inspection hash=%q, preparation hash=%q", inspection.PromptHash, prepared.PromptHash)
-	}
-}
diff --git a/internal/usecase/resolved_targets_test.go b/internal/usecase/resolved_targets_test.go
index 94afb25..f61edfd 100644
--- a/internal/usecase/resolved_targets_test.go
+++ b/internal/usecase/resolved_targets_test.go
@@ -9,20 +9,6 @@ import (
 	"go.maximumdirect.net/promptkit/internal/domain"
 )
 
-func TestInspectProfileAllowsIncompleteResolvedTarget(t *testing.T) {
-	profile := &domain.ExecutionProfile{ID: "partial", ResolvedTarget: &domain.ExecutionTarget{
-		TimeoutSeconds: defaults.ExecutionDefaultTimeoutSeconds,
-	}}
-	runner := &Runner{profiles: staticExecutionProfileRepo{profile: profile}}
-	inspection, err := runner.InspectProfile(context.Background(), "partial")
-	if err != nil {
-		t.Fatalf("partial profile inspection failed: %v", err)
-	}
-	if inspection.EffectiveModelParams.Endpoint != "" || inspection.EffectiveModelParams.Model != "" {
-		t.Fatalf("inspection invented a runnable target: %+v", inspection)
-	}
-}
-
 func TestPreparationCompletesResolvedTargetThroughRequestOverrides(t *testing.T) {
 	profile := &domain.ExecutionProfile{ID: "partial", ResolvedTarget: &domain.ExecutionTarget{
 		TimeoutSeconds: defaults.ExecutionDefaultTimeoutSeconds,
diff --git a/listing_contract_test.go b/listing_contract_test.go
index f1c329a..d0b2678 100644
--- a/listing_contract_test.go
+++ b/listing_contract_test.go
@@ -438,11 +438,11 @@ func TestListIdentitiesUseEffectiveLayeredMembership(t *testing.T) {
 	}
 
 	overlay, err := engine.InspectProfile(context.Background(), "shared/overlay")
-	if err != nil || overlay == nil || overlay.EffectiveModelParams.Model != "effective-model" {
+	if err != nil || overlay == nil || overlay.Model == nil || *overlay.Model != "effective-model" {
 		t.Fatalf("overlay profile did not resolve to its effective definition: (%+v, %v)", overlay, err)
 	}
 	child, err := engine.InspectProfile(context.Background(), "shared/child")
-	if err != nil || child == nil || child.EffectiveModelParams.Model != "base-model" {
+	if err != nil || child == nil || child.Model == nil || *child.Model != "base-model" {
 		t.Fatalf("inherited child profile did not resolve its effective definition: (%+v, %v)", child, err)
 	}
 
diff --git a/profile_inheritance_contract_test.go b/profile_inheritance_contract_test.go
index c9c2106..2337fc1 100644
--- a/profile_inheritance_contract_test.go
+++ b/profile_inheritance_contract_test.go
@@ -41,9 +41,8 @@ func TestProfileInheritanceConfiguredBaseAliasWorkflow(t *testing.T) {
 	if err != nil {
 		t.Fatalf("inspect alias: %v", err)
 	}
-	if child.ProfileID != "child" || child.EffectiveModelParams.BackendID != base.EffectiveModelParams.BackendID ||
-		child.EffectiveModelParams.Model != base.EffectiveModelParams.Model ||
-		child.EffectiveModelParams.ReasoningEffort != reasoning || child.EffectiveModelParams.TimeoutSeconds != timeout {
+	if child.ProfileID != "child" || child.Backend != nil || base.Backend != nil || child.Model == nil || base.Model == nil || *child.Model != *base.Model ||
+		child.ReasoningEffort == nil || *child.ReasoningEffort != reasoning || child.TimeoutSeconds == nil || *child.TimeoutSeconds != timeout {
 		t.Fatalf("alias inspection = %+v, base = %+v", child, base)
 	}
 	prepared, err := engine.Prepare(context.Background(), promptkit.RunRequest{PromptID: "prepared"})
@@ -71,7 +70,7 @@ func TestProfileInheritanceYAMLAliasOfConfiguredProfile(t *testing.T) {
 		t.Fatal(err)
 	}
 	inspection, err := engine.InspectProfile(context.Background(), "yaml-alias")
-	if err != nil || inspection.ProfileID != "yaml-alias" || inspection.EffectiveModelParams.Model == "" {
+	if err != nil || inspection.ProfileID != "yaml-alias" || inspection.Model == nil || *inspection.Model == "" {
 		t.Fatalf("YAML alias inspection = (%+v, %v)", inspection, err)
 	}
 }
@@ -92,7 +91,7 @@ func TestProfileInheritanceRetainsRequiredCredentialBehavior(t *testing.T) {
 		t.Fatal(err)
 	}
 	inspection, err := engine.InspectProfile(context.Background(), "credential-child")
-	if err != nil || !inspection.APIKeyRequired || inspection.EffectiveModelParams.APIKeyEnv != "" {
+	if err != nil || inspection.APIKeyRequired == nil || !*inspection.APIKeyRequired || inspection.APIKeyEnv != nil {
 		t.Fatalf("credential inspection = (%+v, %v)", inspection, err)
 	}
 }
@@ -144,7 +143,7 @@ func TestProfileInheritanceFreezesPreparedExecution(t *testing.T) {
 		t.Fatalf("prepared execution = (%+v, %v), model %q", result, err, client.model)
 	}
 	inspection, err := engine.InspectProfile(context.Background(), "child")
-	if err != nil || inspection.EffectiveModelParams.Model != "first-model" {
+	if err != nil || inspection.Model == nil || *inspection.Model != "first-model" {
 		t.Fatalf("existing engine inspection = (%+v, %v)", inspection, err)
 	}
 }
diff --git a/profile_inspection_contract_test.go b/profile_inspection_contract_test.go
index 159ada1..4e786f0 100644
--- a/profile_inspection_contract_test.go
+++ b/profile_inspection_contract_test.go
@@ -39,7 +39,7 @@ func TestInspectProfileUsesLiteralFileKeyForPreparation(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	if inspected.ProfileID != "  literal  " || prepared.SelectedProfileID != inspected.ProfileID || prepared.EffectiveModelParams.Model != inspected.EffectiveModelParams.Model {
+	if inspected.ProfileID != "  literal  " || inspected.Model == nil || prepared.SelectedProfileID != inspected.ProfileID || prepared.EffectiveModelParams.Model != *inspected.Model {
 		t.Fatalf("inspection=%+v preparation=%+v", inspected, prepared)
 	}
 	if _, err := engine.InspectProfile(context.Background(), "literal"); !errors.Is(err, promptkit.ErrProfileNotFound) {
@@ -61,12 +61,12 @@ func TestInspectProfileIsIndependentAndDoesNotInvokeProvider(t *testing.T) {
 		t.Fatal(err)
 	}
 	first, err := engine.InspectProfile(context.Background(), "profile")
-	if err != nil || first == nil || !first.APIKeyRequired {
+	if err != nil || first == nil || first.APIKeyRequired == nil || !*first.APIKeyRequired || first.ExtraParams == nil {
 		t.Fatalf("first inspection=(%+v, %v)", first, err)
 	}
-	first.EffectiveModelParams.ExtraParams["nested"].(map[string]any)["value"] = "changed"
+	(*first.ExtraParams)["nested"].(map[string]any)["value"] = "changed"
 	second, err := engine.InspectProfile(context.Background(), "profile")
-	if err != nil || second == nil || second.EffectiveModelParams.ExtraParams["nested"].(map[string]any)["value"] != "original" || len(client.requests) != 0 {
+	if err != nil || second == nil || second.ExtraParams == nil || (*second.ExtraParams)["nested"].(map[string]any)["value"] != "original" || len(client.requests) != 0 {
 		t.Fatalf("inspection changed snapshot or invoked provider: (%+v, %v), calls=%d", second, err, len(client.requests))
 	}
 }
@@ -94,7 +94,7 @@ func TestInspectProfilePublicErrorsAndPartialTarget(t *testing.T) {
 		t.Fatalf("canceled inspection: %v", err)
 	}
 	partial, err := engine.InspectProfile(context.Background(), "profile")
-	if err != nil || partial == nil || partial.EffectiveModelParams.Endpoint != "" || partial.EffectiveModelParams.Model != "model" {
+	if err != nil || partial == nil || partial.Endpoint != nil || partial.Model == nil || *partial.Model != "model" {
 		t.Fatalf("partial inspection=(%+v, %v)", partial, err)
 	}
 }
diff --git a/smoke_integration_contract_test.go b/smoke_integration_contract_test.go
index 6188b5c..55a0610 100644
--- a/smoke_integration_contract_test.go
+++ b/smoke_integration_contract_test.go
@@ -422,7 +422,7 @@ func TestSmokeTestUsesPrivateInferenceWithoutApplicationResourcesOrListingChange
 		t.Fatal(err)
 	}
 	if !reflect.DeepEqual(profilesBefore, profilesAfter) || !reflect.DeepEqual(promptsBefore, promptsAfter) ||
-		inspectionBefore.PromptHash != inspectionAfter.PromptHash || inspectionAfter.OutputContract.SchemaPath != schemaMarker {
+		inspectionBefore.PromptHash != inspectionAfter.PromptHash || inspectionAfter.OutputContract.SchemaPath == nil || *inspectionAfter.OutputContract.SchemaPath != schemaMarker {
 		t.Fatalf("diagnostic changed captured listings or application inspection: profiles %v -> %v, prompts %v -> %v, inspection %+v -> %+v",
 			profilesBefore, profilesAfter, promptsBefore, promptsAfter, inspectionBefore, inspectionAfter)
 	}
diff --git a/sources_contract_test.go b/sources_contract_test.go
index d376fef..ff69536 100644
--- a/sources_contract_test.go
+++ b/sources_contract_test.go
@@ -70,7 +70,7 @@ func TestProgrammaticProfileVariantInherits(t *testing.T) {
 		t.Fatal(err)
 	}
 	profile, err := engine.InspectProfile(context.Background(), "child")
-	if err != nil || profile.EffectiveModelParams.Model != model || profile.EffectiveModelParams.Endpoint != endpoint || profile.EffectiveModelParams.TimeoutSeconds != timeout {
+	if err != nil || profile.Model == nil || *profile.Model != model || profile.Endpoint == nil || *profile.Endpoint != endpoint || profile.TimeoutSeconds == nil || *profile.TimeoutSeconds != timeout {
 		t.Fatalf("inherited profile = %+v, %v", profile, err)
 	}
 }