2 files changed, 37 insertions, 1 deletions
diff --git a/internal/appconfig/config.go b/internal/appconfig/config.go
index 63d0437..27c7e02 100644
--- a/internal/appconfig/config.go
+++ b/internal/appconfig/config.go
@@ -670,7 +670,15 @@ func parseSurfaceModels(raw map[string]any, logger *log.Logger) *App {
 		return true
 	}
 	any := appendEntries(&out.CompletionConfigs, "models.completion", table["completion"])
-	any = appendEntries(&out.CodeActionConfigs, "models.code_action", table["code_action"]) || any
+	if ok := appendEntries(&out.CodeActionConfigs, "models.code_action", table["code_action"]); ok {
+		if len(out.CodeActionConfigs) > 1 {
+			if logger != nil {
+				logger.Printf("config: models.code_action supports a single entry; ignoring %d extra", len(out.CodeActionConfigs)-1)
+			}
+			out.CodeActionConfigs = out.CodeActionConfigs[:1]
+		}
+		any = true
+	}
 	any = appendEntries(&out.ChatConfigs, "models.chat", table["chat"]) || any
 	any = appendEntries(&out.CLIConfigs, "models.cli", table["cli"]) || any
 	if !any {
diff --git a/internal/appconfig/config_test.go b/internal/appconfig/config_test.go
index e7f6059..4ae04d8 100644
--- a/internal/appconfig/config_test.go
+++ b/internal/appconfig/config_test.go
@@ -1,6 +1,7 @@
 package appconfig
 
 import (
+	"bytes"
 	"io"
 	"log"
 	"os"
@@ -64,6 +65,33 @@ func TestLoad_Defaults_WithLogger_NoFile_NoEnv(t *testing.T) {
 	}
 }
 
+func TestParseSurfaceModels_CodeActionWarns(t *testing.T) {
+	dir := t.TempDir()
+	path := filepath.Join(dir, "config.toml")
+	writeFile(t, path, `
+[models]
+  [[models.code_action]]
+  provider = "openai"
+  model = "gpt-4o"
+
+  [[models.code_action]]
+  provider = "copilot"
+  model = "cpt"
+`)
+	var buf bytes.Buffer
+	logger := log.New(&buf, "", 0)
+	app, err := loadFromFile(path, logger)
+	if err != nil {
+		t.Fatalf("loadFromFile: %v", err)
+	}
+	if len(app.CodeActionConfigs) != 1 || app.CodeActionConfigs[0].Model != "gpt-4o" {
+		t.Fatalf("expected single code action entry, got %+v", app.CodeActionConfigs)
+	}
+	if msg := buf.String(); !strings.Contains(msg, "models.code_action supports a single entry") {
+		t.Fatalf("expected warning, got %q", msg)
+	}
+}
+
 func TestLoad_FileMerge_And_EnvOverride(t *testing.T) {
 	dir := t.TempDir()
 	t.Setenv("XDG_CONFIG_HOME", dir)