Fix staticcheck: lowercase error strings per Go conventions

Go style guide requires error strings to not be capitalized
(they may be wrapped by other errors).

Author: Siddhant-K-code

cmd/mcp.go

@@ -166,7 +166,7 @@ func runMCP(cmd *cobra.Command, args []string) error {
 		switch backend {
 		case "pinecone":
 			if apiKey == "" {
-				return fmt.Errorf("Pinecone API key required (--api-key or PINECONE_API_KEY)")
+				return fmt.Errorf("pinecone API key required (--api-key or PINECONE_API_KEY)")
 			}
 			ret, err = pcretriever.NewClient(ctx, pcretriever.Config{
 				Config: retriever.Config{
@@ -178,7 +178,7 @@ func runMCP(cmd *cobra.Command, args []string) error {
 
 		case "qdrant":
 			if dbHost == "" {
-				return fmt.Errorf("Qdrant host required (--db-host)")
+				return fmt.Errorf("qdrant host required (--db-host)")
 			}
 			ret, err = qdretriever.NewClient(ctx, qdretriever.Config{
 				Config: retriever.Config{

cmd/query.go

@@ -96,7 +96,7 @@ func runQuery(cmd *cobra.Command, args []string) error {
 		return fmt.Errorf("index name required (--index)")
 	}
 	if openaiKey == "" {
-		return fmt.Errorf("OpenAI API key required for text queries (--openai-key or OPENAI_API_KEY)")
+		return fmt.Errorf("openai API key required for text queries (--openai-key or OPENAI_API_KEY)")
 	}
 
 	// Setup context with cancellation
@@ -118,7 +118,7 @@ func runQuery(cmd *cobra.Command, args []string) error {
 	switch backend {
 	case "pinecone":
 		if apiKey == "" {
-			return fmt.Errorf("Pinecone API key required")
+			return fmt.Errorf("pinecone API key required")
 		}
 		ret, err = pcretriever.NewClient(ctx, pcretriever.Config{
 			Config: retriever.Config{
@@ -130,7 +130,7 @@ func runQuery(cmd *cobra.Command, args []string) error {
 
 	case "qdrant":
 		if dbHost == "" {
-			return fmt.Errorf("Qdrant host required (--db-host)")
+			return fmt.Errorf("qdrant host required (--db-host)")
 		}
 		ret, err = qdretriever.NewClient(ctx, qdretriever.Config{
 			Config: retriever.Config{

cmd/serve.go

@@ -150,7 +150,7 @@ func runServe(cmd *cobra.Command, args []string) error {
 	switch backend {
 	case "pinecone":
 		if apiKey == "" {
-			return fmt.Errorf("Pinecone API key required (--api-key or PINECONE_API_KEY)")
+			return fmt.Errorf("pinecone API key required (--api-key or PINECONE_API_KEY)")
 		}
 		if index == "" {
 			return fmt.Errorf("index name required (--index)")
@@ -165,7 +165,7 @@ func runServe(cmd *cobra.Command, args []string) error {
 
 	case "qdrant":
 		if dbHost == "" {
-			return fmt.Errorf("Qdrant host required (--db-host)")
+			return fmt.Errorf("qdrant host required (--db-host)")
 		}
 		if index == "" {
 			return fmt.Errorf("collection name required (--index)")

cmd/sync.go

@@ -78,15 +78,15 @@ func runSync(cmd *cobra.Command, args []string) error {
 		apiKey = os.Getenv("PINECONE_API_KEY")
 	}
 	if apiKey == "" {
-		return fmt.Errorf("Pinecone API key is required. Set PINECONE_API_KEY or use --api-key")
+		return fmt.Errorf("pinecone API key is required: set PINECONE_API_KEY or use --api-key")
 	}
 
 	// Resolve index from env if not provided
 	if indexName == "" {
 		indexName = viper.GetString("index")
 	}
 	if indexName == "" {
-		return fmt.Errorf("Pinecone index name is required. Use --index flag")
+		return fmt.Errorf("pinecone index name is required: use --index flag")
 	}
 
 	// Setup context with cancellation