adding test

cmd/launch/opencode.go

@@ -1,16 +1,21 @@
 package launch
 
 import (
+	"context"
 	"encoding/json"
 	"fmt"
+	"net/http"
 	"os"
 	"os/exec"
 	"path/filepath"
 	"runtime"
 	"slices"
+	"strings"
 
+	"github.com/ollama/ollama/api"
 	"github.com/ollama/ollama/cmd/internal/fileutil"
 	"github.com/ollama/ollama/envconfig"
+	modeltype "github.com/ollama/ollama/types/model"
 )
 
 // OpenCode implements Runner and Editor for OpenCode integration.
@@ -229,6 +234,9 @@ func readModelJSONModels() []string {
 }
 
 func buildModelEntries(modelList []string) map[string]any {
+	client := api.NewClient(envconfig.Host(), http.DefaultClient)
+	ctx := context.Background()
+
 	models := make(map[string]any)
 	for _, model := range modelList {
 		entry := map[string]any{
@@ -242,7 +250,49 @@ func buildModelEntries(modelList []string) map[string]any {
 				}
 			}
 		}
+		applyOpenCodeReasoning(ctx, client, model, entry)
 		models[model] = entry
 	}
 	return models
 }
+
+// applyOpenCodeReasoning detects thinking capability and sets reasoning config
+// on the model entry. When the model supports thinking, it sets "reasoning": true
+// and configures variants for the OpenCode TUI:
+//   - GPT-OSS: supports variable effort levels (low/medium/high) and defaults to
+//     medium via options. Thinking cannot be turned off.
+//   - Other models: only support on/off. Disables built-in low/medium/high variants
+//     and adds a "none" variant so users can toggle thinking off via Ctrl+T.
+//
+// When the model does not support thinking, no reasoning config is set.
+func applyOpenCodeReasoning(ctx context.Context, client *api.Client, modelName string, entry map[string]any) {
+	resp, err := client.Show(ctx, &api.ShowRequest{Model: modelName})
+	if err != nil {
+		return
+	}
+
+	if slices.Contains(resp.Capabilities, modeltype.CapabilityThinking) {
+		entry["reasoning"] = true
+
+		if strings.Contains(modelName, "gpt-oss") {
+			// GPT-OSS models support variable thinking effort levels
+			// and cannot turn thinking off. Keep the built-in
+			// low/medium/high variants as-is and default to medium.
+			options, ok := entry["options"].(map[string]any)
+			if !ok {
+				options = make(map[string]any)
+			}
+			options["reasoningEffort"] = "medium"
+			entry["options"] = options
+		} else {
+			// Most models only support thinking on or off.
+			// Disable the built-in low/medium/high variants and add none.
+			entry["variants"] = map[string]any{
+				"none":   map[string]any{"reasoningEffort": "none"},
+				"low":    map[string]any{"disabled": true},
+				"medium": map[string]any{"disabled": true},
+				"high":   map[string]any{"disabled": true},
+			}
+		}
+	}
+}

cmd/launch/opencode_test.go

@@ -3,6 +3,8 @@ package launch
 import (
 	"encoding/json"
 	"fmt"
+	"net/http"
+	"net/http/httptest"
 	"os"
 	"path/filepath"
 	"runtime"
@@ -241,6 +243,133 @@ func TestLookupCloudModelLimit(t *testing.T) {
 	}
 }
 
+// inlineConfigModel extracts a model entry from the inline config content.
+func inlineConfigModel(t *testing.T, content, model string) map[string]any {
+	t.Helper()
+	var cfg map[string]any
+	if err := json.Unmarshal([]byte(content), &cfg); err != nil {
+		t.Fatalf("configContent is not valid JSON: %v", err)
+	}
+	provider, _ := cfg["provider"].(map[string]any)
+	ollama, _ := provider["ollama"].(map[string]any)
+	models, _ := ollama["models"].(map[string]any)
+	entry, ok := models[model].(map[string]any)
+	if !ok {
+		t.Fatalf("model %s not found in inline config", model)
+	}
+	return entry
+}
+
+func TestOpenCodeEdit_ReasoningOnThinkingModel(t *testing.T) {
+	setTestHome(t, t.TempDir())
+
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path == "/api/show" {
+			fmt.Fprintf(w, `{"capabilities":["thinking"],"model_info":{}}`)
+			return
+		}
+		w.WriteHeader(http.StatusNotFound)
+	}))
+	defer srv.Close()
+	t.Setenv("OLLAMA_HOST", srv.URL)
+
+	o := &OpenCode{}
+	if err := o.Edit([]string{"qwq"}); err != nil {
+		t.Fatal(err)
+	}
+
+	entry := inlineConfigModel(t, o.configContent, "qwq")
+	if entry["reasoning"] != true {
+		t.Error("expected reasoning = true for thinking model")
+	}
+	variants, ok := entry["variants"].(map[string]any)
+	if !ok {
+		t.Fatal("expected variants to be set")
+	}
+	none, ok := variants["none"].(map[string]any)
+	if !ok {
+		t.Fatal("expected none variant to be set")
+	}
+	if none["reasoningEffort"] != "none" {
+		t.Errorf("none variant reasoningEffort = %v, want none", none["reasoningEffort"])
+	}
+	// Built-in low/medium/high should be disabled
+	for _, level := range []string{"low", "medium", "high"} {
+		v, ok := variants[level].(map[string]any)
+		if !ok {
+			t.Errorf("expected %s variant to exist", level)
+			continue
+		}
+		if v["disabled"] != true {
+			t.Errorf("expected %s variant to be disabled", level)
+		}
+	}
+}
+
+func TestOpenCodeEdit_ReasoningLevelsOnGptOss(t *testing.T) {
+	setTestHome(t, t.TempDir())
+
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path == "/api/show" {
+			fmt.Fprintf(w, `{"capabilities":["thinking"],"model_info":{}}`)
+			return
+		}
+		w.WriteHeader(http.StatusNotFound)
+	}))
+	defer srv.Close()
+	t.Setenv("OLLAMA_HOST", srv.URL)
+
+	o := &OpenCode{}
+	if err := o.Edit([]string{"gpt-oss:120b-cloud"}); err != nil {
+		t.Fatal(err)
+	}
+
+	entry := inlineConfigModel(t, o.configContent, "gpt-oss:120b-cloud")
+	if entry["reasoning"] != true {
+		t.Error("expected reasoning = true")
+	}
+	// GPT-OSS cannot turn thinking off and supports levels,
+	// so no custom variants should be written.
+	if entry["variants"] != nil {
+		t.Errorf("expected no variants for gpt-oss, got %v", entry["variants"])
+	}
+	// Should default to medium reasoning effort
+	opts, ok := entry["options"].(map[string]any)
+	if !ok {
+		t.Fatal("expected options to be set for gpt-oss")
+	}
+	if opts["reasoningEffort"] != "medium" {
+		t.Errorf("reasoningEffort = %v, want medium", opts["reasoningEffort"])
+	}
+}
+
+func TestOpenCodeEdit_NoReasoningOnNonThinkingModel(t *testing.T) {
+	setTestHome(t, t.TempDir())
+
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path == "/api/show" {
+			fmt.Fprintf(w, `{"capabilities":[],"model_info":{}}`)
+			return
+		}
+		w.WriteHeader(http.StatusNotFound)
+	}))
+	defer srv.Close()
+	t.Setenv("OLLAMA_HOST", srv.URL)
+
+	o := &OpenCode{}
+	if err := o.Edit([]string{"llama3.2"}); err != nil {
+		t.Fatal(err)
+	}
+
+	entry := inlineConfigModel(t, o.configContent, "llama3.2")
+	if entry["reasoning"] != nil {
+		t.Errorf("expected no reasoning for non-thinking model, got %v", entry["reasoning"])
+	}
+	if entry["variants"] != nil {
+		t.Errorf("expected no variants for non-thinking model, got %v", entry["variants"])
+	}
+}
+
 func TestFindOpenCode(t *testing.T) {
 	t.Run("fallback to ~/.opencode/bin", func(t *testing.T) {
 		tmpDir := t.TempDir()