io: use errors.Is for EOF checks in lsp and mcp servers (task 409)

3 files changed, 7 insertions, 4 deletions

diff --git a/internal/lsp/server.go b/internal/lsp/server.go
index 573428b..9516e37 100644
--- a/internal/lsp/server.go
+++ b/internal/lsp/server.go
@@ -5,6 +5,7 @@ import (
 	"bufio"
 	"context"
 	"encoding/json"
+	"errors"
 	"io"
 	"log"
 	"strings"
@@ -415,7 +416,7 @@ func (s *Server) Run() error {
 	defer s.cancelRequests()
 	for {
 		body, err := s.readMessage()
-		if err == io.EOF {
+		if errors.Is(err, io.EOF) {
 			return nil
 		}
 		if err != nil {
diff --git a/internal/mcp/server.go b/internal/mcp/server.go
index 17df79f..772d311 100644
--- a/internal/mcp/server.go
+++ b/internal/mcp/server.go
@@ -4,6 +4,7 @@ package mcp
 import (
 	"bufio"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"log"
@@ -71,7 +72,7 @@ func NewServer(r io.Reader, w io.Writer, logger *log.Logger, store promptstore.P
 func (s *Server) Run() error {
 	for {
 		body, err := s.readMessage()
-		if err == io.EOF {
+		if errors.Is(err, io.EOF) {
 			return nil
 		}
 		if err != nil {
diff --git a/internal/mcp/transport.go b/internal/mcp/transport.go
index 4708e6d..9147ea0 100644
--- a/internal/mcp/transport.go
+++ b/internal/mcp/transport.go
@@ -4,6 +4,7 @@ package mcp
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"strings"
@@ -17,7 +18,7 @@ func (s *Server) readMessage() ([]byte, error) {
 	for {
 		line, err := s.in.ReadString('\n')
 		if err != nil && len(line) == 0 {
-			if err == io.EOF {
+			if errors.Is(err, io.EOF) {
 				return nil, io.EOF
 			}
 			return nil, fmt.Errorf("read error: %w", err)
@@ -25,7 +26,7 @@ func (s *Server) readMessage() ([]byte, error) {
 		line = strings.TrimSpace(line)
 		if line == "" {
 			// If we hit EOF on an empty line, propagate it
-			if err == io.EOF {
+			if errors.Is(err, io.EOF) {
 				return nil, io.EOF
 			}
 			continue // skip empty lines