diff --git a/docs/roadmap/implementation.md b/docs/roadmap/implementation.md
index 44ec7aa..007d66d 100644
--- a/docs/roadmap/implementation.md
+++ b/docs/roadmap/implementation.md
@@ -626,6 +626,11 @@ documentation is updated.
 focused changed-seam cases retain final values, paths and relevant error meaning.
 This stage changes organization, not configuration acceptance policy.
 
+Completion: final-handoff traversal retains its resource index and delegates
+backend, profile, and prompt records to focused validators. Configuration tests
+and focused public configuration, validation, inspection, and source tests pass
+on Go 1.27.3; the extracted checks preserve their existing paths and rules.
+
 ## Stage 24: Separate Prompt Capture And Effective Target Construction
 
 **Catalog:** 22, completion. **Files:** configuration prompts/targets and tests.
diff --git a/internal/configuration/load.go b/internal/configuration/load.go
index 149fb05..f3996c6 100644
--- a/internal/configuration/load.go
+++ b/internal/configuration/load.go
@@ -419,101 +419,110 @@ func validateEffective(config *document, validation *configkit.Validation) {
 	}
 	for _, resources := range sets {
 		for index, backend := range resources.backends {
-			base := resources.bases.backends.Index(index)
-			validateBackendEndpoints(backend, base, validation)
-			if !domain.IsValidLocalResourceKey(backend.ID) {
-				validation.Error(base.Key("id"), "backend ID must be a nonblank local key without a slash")
-			}
-			if backend.Endpoint == nil || *backend.Endpoint == "" {
-				validation.Error(base.Key("endpoint"), "endpoint is required")
-			}
-			if backend.APIKeyEnv != nil && *backend.APIKeyEnv != "" && !envName.MatchString(*backend.APIKeyEnv) {
-				validation.Error(base.Key("api_key_env"), "environment variable name is invalid")
-			}
-			if backend.ConcurrencyLimit != nil && *backend.ConcurrencyLimit < 0 {
-				validation.Error(base.Key("concurrency_limit"), "concurrency limit must not be negative")
-			}
-			if backend.QueueCapacity != nil {
-				if *backend.QueueCapacity < 0 {
-					validation.Error(base.Key("queue_capacity"), "queue capacity must not be negative")
-				}
-				if backend.ConcurrencyLimit == nil || *backend.ConcurrencyLimit <= 0 {
-					validation.Error(base.Key("queue_capacity"), "queue capacity requires a positive concurrency limit")
-				} else if *backend.QueueCapacity > int(^uint(0)>>1)-*backend.ConcurrencyLimit {
-					validation.Error(base.Key("queue_capacity"), "total capacity overflows int")
-				}
-			}
-			validateExtraParams(backend.ExtraParams, base.Key("extra_params"), true, validation)
-			if smokeTests := backend.SmokeTests; smokeTests != nil {
-				smokePath := base.Key("smoke_tests")
-				if smokeTests.DefaultProfile != nil {
-					if strings.TrimSpace(*smokeTests.DefaultProfile) == "" {
-						validation.Error(smokePath.Key("default_profile"), "default profile must not be blank")
-					} else if !domain.IsValidResourceID(*smokeTests.DefaultProfile) {
-						validation.Error(smokePath.Key("default_profile"), "default profile reference is malformed")
-					}
-				}
-				if authentication := smokeTests.Authentication; authentication != nil {
-					kindPath := smokePath.Key("authentication").Key("kind")
-					if authentication.Kind == nil {
-						validation.Error(kindPath, "authentication kind is required")
-					} else if *authentication.Kind != "none" && *authentication.Kind != "openrouter_key" {
-						validation.Error(kindPath, "authentication kind must be none or openrouter_key")
-					}
-				}
-			}
+			validateBackendRecord(backend, resources.bases.backends.Index(index), validation)
 		}
 		for index, profile := range resources.profiles {
-			base := resources.bases.profiles.Index(index)
-			if profile.Endpoint != nil && *profile.Endpoint != "" {
-				if _, err := domain.NormalizeOpenAICompatibleBaseEndpoint(*profile.Endpoint); err != nil {
-					validation.Error(base.Key("endpoint"), err.Error())
-				}
-			}
-			if !domain.IsValidLocalResourceKey(profile.ID) {
-				validation.Error(base.Key("id"), "profile ID must be a nonblank local key without a slash")
-			}
-			if profile.Backend != nil && *profile.Backend != "" {
-				if !domain.IsValidResourceID(*profile.Backend) {
-					validation.Error(base.Key("backend"), "backend reference is malformed")
-				} else if _, exists := backendIDs[*profile.Backend]; !exists {
-					validation.Error(base.Key("backend"), "backend is not defined")
-				}
-			}
-			if profile.Model != nil && *profile.Model != "" && strings.TrimSpace(*profile.Model) == "" {
-				validation.Error(base.Key("model"), "model must not be blank")
-			}
-			if profile.Temperature != nil {
-				if err := domain.ValidateExecutionTargetSettings(domain.ExecutionTarget{Temperature: *profile.Temperature}); err != nil {
-					validation.Error(base.Key("temperature"), err.Error())
-				}
-			}
-			if profile.TopP != nil {
-				if err := domain.ValidateExecutionTargetSettings(domain.ExecutionTarget{TopP: *profile.TopP}); err != nil {
-					validation.Error(base.Key("top_p"), err.Error())
-				}
-			}
-			if profile.MaxTokens != nil {
-				if err := domain.ValidateExecutionTargetSettings(domain.ExecutionTarget{MaxTokens: *profile.MaxTokens}); err != nil {
-					validation.Error(base.Key("max_tokens"), err.Error())
-				}
-			}
-			if profile.TimeoutSeconds != nil {
-				if err := domain.ValidateExecutionTargetSettings(domain.ExecutionTarget{TimeoutSeconds: *profile.TimeoutSeconds}); err != nil {
-					validation.Error(base.Key("timeout_seconds"), err.Error())
-				}
-			}
-			validateExtraParams(profile.ExtraParams, base.Key("extra_params"), false, validation)
+			validateProfileRecord(profile, resources.bases.profiles.Index(index), backendIDs, validation)
 		}
 		for index, prompt := range resources.prompts {
-			base := resources.bases.prompts.Index(index)
-			if !domain.IsValidLocalResourceKey(prompt.ID) {
-				validation.Error(base.Key("id"), "prompt ID must be a nonblank local key without a slash")
-			}
-			if prompt.DefaultProfile != nil && *prompt.DefaultProfile != "" && !domain.IsValidResourceID(*prompt.DefaultProfile) {
-				validation.Error(base.Key("default_profile"), "default profile reference is malformed")
+			validatePromptRecord(prompt, resources.bases.prompts.Index(index), validation)
+		}
+	}
+}
+
+func validateBackendRecord(backend backendConfig, base configkit.Path, validation *configkit.Validation) {
+	validateBackendEndpoints(backend, base, validation)
+	if !domain.IsValidLocalResourceKey(backend.ID) {
+		validation.Error(base.Key("id"), "backend ID must be a nonblank local key without a slash")
+	}
+	if backend.Endpoint == nil || *backend.Endpoint == "" {
+		validation.Error(base.Key("endpoint"), "endpoint is required")
+	}
+	if backend.APIKeyEnv != nil && *backend.APIKeyEnv != "" && !envName.MatchString(*backend.APIKeyEnv) {
+		validation.Error(base.Key("api_key_env"), "environment variable name is invalid")
+	}
+	if backend.ConcurrencyLimit != nil && *backend.ConcurrencyLimit < 0 {
+		validation.Error(base.Key("concurrency_limit"), "concurrency limit must not be negative")
+	}
+	if backend.QueueCapacity != nil {
+		if *backend.QueueCapacity < 0 {
+			validation.Error(base.Key("queue_capacity"), "queue capacity must not be negative")
+		}
+		if backend.ConcurrencyLimit == nil || *backend.ConcurrencyLimit <= 0 {
+			validation.Error(base.Key("queue_capacity"), "queue capacity requires a positive concurrency limit")
+		} else if *backend.QueueCapacity > int(^uint(0)>>1)-*backend.ConcurrencyLimit {
+			validation.Error(base.Key("queue_capacity"), "total capacity overflows int")
+		}
+	}
+	validateExtraParams(backend.ExtraParams, base.Key("extra_params"), true, validation)
+	if smokeTests := backend.SmokeTests; smokeTests != nil {
+		smokePath := base.Key("smoke_tests")
+		if smokeTests.DefaultProfile != nil {
+			if strings.TrimSpace(*smokeTests.DefaultProfile) == "" {
+				validation.Error(smokePath.Key("default_profile"), "default profile must not be blank")
+			} else if !domain.IsValidResourceID(*smokeTests.DefaultProfile) {
+				validation.Error(smokePath.Key("default_profile"), "default profile reference is malformed")
 			}
 		}
+		if authentication := smokeTests.Authentication; authentication != nil {
+			kindPath := smokePath.Key("authentication").Key("kind")
+			if authentication.Kind == nil {
+				validation.Error(kindPath, "authentication kind is required")
+			} else if *authentication.Kind != "none" && *authentication.Kind != "openrouter_key" {
+				validation.Error(kindPath, "authentication kind must be none or openrouter_key")
+			}
+		}
+	}
+}
+
+func validateProfileRecord(profile profileConfig, base configkit.Path, backendIDs map[string]struct{}, validation *configkit.Validation) {
+	if profile.Endpoint != nil && *profile.Endpoint != "" {
+		if _, err := domain.NormalizeOpenAICompatibleBaseEndpoint(*profile.Endpoint); err != nil {
+			validation.Error(base.Key("endpoint"), err.Error())
+		}
+	}
+	if !domain.IsValidLocalResourceKey(profile.ID) {
+		validation.Error(base.Key("id"), "profile ID must be a nonblank local key without a slash")
+	}
+	if profile.Backend != nil && *profile.Backend != "" {
+		if !domain.IsValidResourceID(*profile.Backend) {
+			validation.Error(base.Key("backend"), "backend reference is malformed")
+		} else if _, exists := backendIDs[*profile.Backend]; !exists {
+			validation.Error(base.Key("backend"), "backend is not defined")
+		}
+	}
+	if profile.Model != nil && *profile.Model != "" && strings.TrimSpace(*profile.Model) == "" {
+		validation.Error(base.Key("model"), "model must not be blank")
+	}
+	if profile.Temperature != nil {
+		if err := domain.ValidateExecutionTargetSettings(domain.ExecutionTarget{Temperature: *profile.Temperature}); err != nil {
+			validation.Error(base.Key("temperature"), err.Error())
+		}
+	}
+	if profile.TopP != nil {
+		if err := domain.ValidateExecutionTargetSettings(domain.ExecutionTarget{TopP: *profile.TopP}); err != nil {
+			validation.Error(base.Key("top_p"), err.Error())
+		}
+	}
+	if profile.MaxTokens != nil {
+		if err := domain.ValidateExecutionTargetSettings(domain.ExecutionTarget{MaxTokens: *profile.MaxTokens}); err != nil {
+			validation.Error(base.Key("max_tokens"), err.Error())
+		}
+	}
+	if profile.TimeoutSeconds != nil {
+		if err := domain.ValidateExecutionTargetSettings(domain.ExecutionTarget{TimeoutSeconds: *profile.TimeoutSeconds}); err != nil {
+			validation.Error(base.Key("timeout_seconds"), err.Error())
+		}
+	}
+	validateExtraParams(profile.ExtraParams, base.Key("extra_params"), false, validation)
+}
+
+func validatePromptRecord(prompt promptConfig, base configkit.Path, validation *configkit.Validation) {
+	if !domain.IsValidLocalResourceKey(prompt.ID) {
+		validation.Error(base.Key("id"), "prompt ID must be a nonblank local key without a slash")
+	}
+	if prompt.DefaultProfile != nil && *prompt.DefaultProfile != "" && !domain.IsValidResourceID(*prompt.DefaultProfile) {
+		validation.Error(base.Key("default_profile"), "default profile reference is malformed")
 	}
 }