Add lightweight configuration lookups

internal/configuration/prompts.go

@@ -297,14 +297,14 @@ func (state *loaded) readContent(fieldPath configkit.Path, name string, lookupOr
 	return string(content), nil
 }
 
-func (state *loaded) prompt(id, version string) (*domain.PromptDefinition, domain.PromptInspection, error) {
+func (state *loaded) lookupPromptEntry(id, version string) (*promptEntry, error) {
 	if state == nil || strings.TrimSpace(id) == "" || (version != "" && strings.TrimSpace(version) == "") {
-		return nil, domain.PromptInspection{}, errPromptNotFound
+		return nil, errPromptNotFound
 	}
 	versions := state.prompts[id]
 	if version == "" {
 		if state.ambiguous[id] {
-			return nil, domain.PromptInspection{}, errPromptAmbiguous
+			return nil, errPromptAmbiguous
 		}
 		for selected := range versions {
 			version = selected
@@ -312,9 +312,12 @@ func (state *loaded) prompt(id, version string) (*domain.PromptDefinition, domai
 	}
 	entry := versions[version]
 	if entry == nil {
-		return nil, domain.PromptInspection{}, errPromptNotFound
+		return nil, errPromptNotFound
 	}
-	definition := entry.definition
+	return entry, nil
+}
+
+func ownPromptDefinition(definition domain.PromptDefinition) *domain.PromptDefinition {
 	definition.Inputs = append([]domain.PromptInput(nil), definition.Inputs...)
 	definition.Templates = append([]domain.PromptMessageTemplate(nil), definition.Templates...)
 	for index := range definition.Templates {
@@ -323,9 +326,27 @@ func (state *loaded) prompt(id, version string) (*domain.PromptDefinition, domai
 			definition.Templates[index].CacheControl = &copy
 		}
 	}
-	inspection := entry.inspection
+	return &definition
+}
+
+func ownPromptInspection(inspection domain.PromptInspection) *domain.PromptInspection {
 	inspection.Inputs = append([]domain.PromptInput(nil), inspection.Inputs...)
-	return &definition, inspection, nil
+	return &inspection
+}
+
+func promptLookupError(err error) error {
+	if errors.Is(err, errPromptNotFound) {
+		return promptdef.ErrPromptDefinitionNotFound
+	}
+	return err
+}
+
+func (state *loaded) prompt(id, version string) (*domain.PromptDefinition, domain.PromptInspection, error) {
+	entry, err := state.lookupPromptEntry(id, version)
+	if err != nil {
+		return nil, domain.PromptInspection{}, err
+	}
+	return ownPromptDefinition(entry.definition), *ownPromptInspection(entry.inspection), nil
 }
 
 // GetPromptSnapshot returns an independently owned captured definition and its
@@ -334,14 +355,24 @@ func (state *loaded) GetPromptSnapshot(ctx context.Context, id, version string)
 	if err := ctx.Err(); err != nil {
 		return nil, "", err
 	}
-	definition, inspection, err := state.prompt(id, version)
-	if errors.Is(err, errPromptNotFound) {
-		return nil, "", promptdef.ErrPromptDefinitionNotFound
-	}
+	entry, err := state.lookupPromptEntry(id, version)
 	if err != nil {
-		return nil, "", err
+		return nil, "", promptLookupError(err)
 	}
-	return definition, inspection.PromptHash, nil
+	return ownPromptDefinition(entry.definition), entry.hash, nil
+}
+
+// GetPromptInspection returns an independently owned inspection of one
+// captured prompt without copying its execution templates.
+func (state *loaded) GetPromptInspection(ctx context.Context, id, version string) (*domain.PromptInspection, error) {
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+	entry, err := state.lookupPromptEntry(id, version)
+	if err != nil {
+		return nil, promptLookupError(err)
+	}
+	return ownPromptInspection(entry.inspection), nil
 }
 
 // GetPromptDefinition implements the runner's prompt lookup boundary.