diff --git a/docs/roadmap/implementation.md b/docs/roadmap/implementation.md
index 1759b15..228eae3 100644
--- a/docs/roadmap/implementation.md
+++ b/docs/roadmap/implementation.md
@@ -278,6 +278,10 @@ not collapse runtime explicit zero or broaden accepted configuration shapes.
 
 ## Stage 3: Project Resolved Backend And Profile Resources
 
+**Completed:** Exact-ID resource lookups reuse captured resolved indexes; focused
+configuration tests cover partial inheritance, explicit values, backend defaults,
+derived queue capacity, diagnostics, missing IDs, and cancellation.
+
 **Scope:** Configuration-owned views and exact-ID resource lookup.
 
 1. Add private-adapter result structs in `internal/configuration`, with fields
diff --git a/internal/configuration/load.go b/internal/configuration/load.go
index e026b60..d518176 100644
--- a/internal/configuration/load.go
+++ b/internal/configuration/load.go
@@ -122,6 +122,8 @@ type loaded struct {
 	promptMetadata  map[string][]promptInputPresence
 	prompts         map[string]*promptEntry
 	registry        *backend.Registry
+	backendRecords  map[string]backendConfig
+	profileRecords  map[string]profileConfig
 	indexedProfiles map[string]domain.ExecutionProfile
 	backendIDs      []string
 	profileIDs      []string
diff --git a/internal/configuration/resources.go b/internal/configuration/resources.go
new file mode 100644
index 0000000..4cc96b1
--- /dev/null
+++ b/internal/configuration/resources.go
@@ -0,0 +1,71 @@
+package configuration
+
+import (
+	"context"
+	"fmt"
+
+	"go.maximumdirect.net/promptkit/internal/backend"
+	"go.maximumdirect.net/promptkit/internal/domain"
+	"go.maximumdirect.net/promptkit/internal/profile"
+)
+
+// ProfileResource is the resolved profile before execution completion.
+// Its fields borrow immutable configuration captured by the adapter.
+type ProfileResource struct {
+	ID                           string
+	Backend, Endpoint, Model     *string
+	Temperature, TopP            *float64
+	MaxTokens, TimeoutSeconds    *int
+	ServiceTier, ReasoningEffort *string
+	APIKeyEnv                    *string
+	APIKeyRequired               *bool
+	ExtraParams                  map[string]any
+}
+
+// BackendResource is the resolved backend and its configured diagnostics.
+// Its fields borrow immutable configuration captured by the adapter.
+type BackendResource struct {
+	ID, Endpoint                    string
+	APIKeyEnv                       *string
+	ConcurrencyLimit, QueueCapacity *int
+	ExtraParams                     map[string]any
+	SmokeTests                      *domain.BackendSmokeTestConfig
+}
+
+func (state *loaded) InspectProfile(ctx context.Context, id string) (*ProfileResource, error) {
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+	if state == nil {
+		return nil, fmt.Errorf("%w: %q", profile.ErrProfileNotFound, id)
+	}
+	config, ok := state.profileRecords[id]
+	if !ok {
+		return nil, fmt.Errorf("%w: %q", profile.ErrProfileNotFound, id)
+	}
+	return &ProfileResource{
+		ID: id, Backend: config.Backend, Endpoint: config.Endpoint, Model: config.Model,
+		Temperature: config.Temperature, TopP: config.TopP, MaxTokens: config.MaxTokens,
+		TimeoutSeconds: config.TimeoutSeconds, ServiceTier: config.ServiceTier,
+		ReasoningEffort: config.ReasoningEffort, APIKeyEnv: config.APIKeyEnv,
+		APIKeyRequired: config.APIKeyRequired, ExtraParams: config.ExtraParams,
+	}, nil
+}
+
+func (state *loaded) InspectBackend(ctx context.Context, id string) (*BackendResource, error) {
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+	if state == nil {
+		return nil, fmt.Errorf("%w: %q", backend.ErrBackendNotFound, id)
+	}
+	config, ok := state.backendRecords[id]
+	if !ok {
+		return nil, fmt.Errorf("%w: %q", backend.ErrBackendNotFound, id)
+	}
+	return &BackendResource{
+		ID: id, Endpoint: valueOrZero(config.Endpoint), APIKeyEnv: config.APIKeyEnv,
+		ConcurrencyLimit: config.ConcurrencyLimit, QueueCapacity: config.QueueCapacity,
+		ExtraParams: config.ExtraParams, SmokeTests: captureBackend(id, config).SmokeTests,
+	}, nil
+}
diff --git a/internal/configuration/resources_test.go b/internal/configuration/resources_test.go
new file mode 100644
index 0000000..d022687
--- /dev/null
+++ b/internal/configuration/resources_test.go
@@ -0,0 +1,53 @@
+package configuration
+
+import (
+	"context"
+	"errors"
+	"testing"
+
+	"go.maximumdirect.net/promptkit/internal/backend"
+	"go.maximumdirect.net/promptkit/internal/profile"
+)
+
+func TestResolvedBackendAndProfileResources(t *testing.T) {
+	state, err := load(mapping("resources", map[string]any{
+		"backends": []any{map[string]any{"id": "local", "endpoint": "https://example.test/v1", "concurrency_limit": 2,
+			"extra_params": map[string]any{"backend": true}, "smoke_tests": map[string]any{"default_profile": "missing", "reachability": map[string]any{}}}},
+		"profiles": []any{
+			map[string]any{"id": "parent", "backend": "local", "temperature": 0.4},
+			map[string]any{"id": "child", "extends": map[string]any{"id": "parent"}, "temperature": 0, "endpoint": "", "extra_params": map[string]any{}},
+		},
+	}), nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resource, err := state.InspectProfile(context.Background(), "child")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if resource.ID != "child" || resource.Backend == nil || *resource.Backend != "local" || resource.Endpoint == nil || *resource.Endpoint != "" || resource.Temperature == nil || *resource.Temperature != 0 || resource.Model != nil || resource.ExtraParams == nil || len(resource.ExtraParams) != 0 {
+		t.Fatalf("profile resource = %+v", resource)
+	}
+	target, err := state.GetProfile(context.Background(), "child")
+	if err != nil || target.ResolvedTarget.ExtraParams["backend"] != true {
+		t.Fatalf("execution target = %+v, %v", target, err)
+	}
+	resourceBackend, err := state.InspectBackend(context.Background(), "local")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if resourceBackend.Endpoint != "https://example.test/v1" || resourceBackend.QueueCapacity == nil || *resourceBackend.QueueCapacity != 1024 || resourceBackend.SmokeTests == nil || resourceBackend.SmokeTests.DefaultProfile == nil || *resourceBackend.SmokeTests.DefaultProfile != "missing" || resourceBackend.SmokeTests.Reachability == nil || resourceBackend.SmokeTests.Reachability.Endpoint != nil {
+		t.Fatalf("backend resource = %+v", resourceBackend)
+	}
+	if _, err := state.InspectBackend(context.Background(), "missing"); !errors.Is(err, backend.ErrBackendNotFound) {
+		t.Fatalf("backend error = %v", err)
+	}
+	if _, err := state.InspectProfile(context.Background(), "missing"); !errors.Is(err, profile.ErrProfileNotFound) {
+		t.Fatalf("profile error = %v", err)
+	}
+	ctx, cancel := context.WithCancel(context.Background())
+	cancel()
+	if _, err := state.InspectBackend(ctx, "local"); !errors.Is(err, context.Canceled) {
+		t.Fatalf("cancellation = %v", err)
+	}
+}
diff --git a/internal/configuration/targets.go b/internal/configuration/targets.go
index 06eb4f1..d059401 100644
--- a/internal/configuration/targets.go
+++ b/internal/configuration/targets.go
@@ -14,6 +14,8 @@ import (
 func (state *loaded) buildExecutionProfiles() error {
 	backendConfigs := indexedBackends(&state.result.Config)
 	profileConfigs := indexedProfiles(&state.result.Config)
+	state.backendRecords = backendConfigs
+	state.profileRecords = profileConfigs
 	definitions := make(map[string]domain.Backend, len(backendConfigs))
 	for _, id := range sortedKeys(backendConfigs) {
 		config := backendConfigs[id]