chore(deps): bump Go 1.26.2, go-sdk v1.5.0, fix docs and CI

- Bump Go to 1.26.2 and go-sdk to v1.5.0
- Fix MCP dependency references in README and CRUSH.md (was mark3labs/mcp-go, now modelcontextprotocol/go-sdk)
- Remove stale google/uuid reference from CRUSH.md
- Add staticcheck to CI workflow
- Simplify test helpers (use strings.Contains)

.github/workflows/test.yml

@@ -0,0 +1,20 @@
+name: Test
+on:
+  push:
+    branches: [master]
+  pull_request:
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+      - name: Install ALSA dev headers
+        run: sudo apt-get update && sudo apt-get install -y libasound2-dev
+      - run: go test -race ./...
+      - run: go vet ./...
+      - run: go install honnef.co/go/tools/cmd/staticcheck@latest
+      - run: staticcheck ./...
+      - run: go build ./...

CRUSH.md

@@ -30,7 +30,6 @@
 - `history`: List available audio files with text summaries
 
 ## Dependencies
-- `github.com/mark3labs/mcp-go` - MCP server framework
+- `github.com/modelcontextprotocol/go-sdk` - MCP server framework (official SDK)
 - `github.com/taigrr/elevenlabs` - ElevenLabs API client
-- `github.com/gopxl/beep` - Audio playback
-- `github.com/google/uuid` - UUID generation
+- `github.com/gopxl/beep` - Audio playback

README.md

@@ -54,7 +54,7 @@ The server provides the following tools to MCP clients:
 
 - [ElevenLabs API](https://elevenlabs.io) for text-to-speech generation
 - [Beep library](https://github.com/gopxl/beep) for audio playback
-- [MCP-Go](https://github.com/mark3labs/mcp-go) for MCP server functionality
+- [MCP Go SDK](https://github.com/modelcontextprotocol/go-sdk) for MCP server functionality
 
 ## License
 

go.mod

@@ -1,19 +1,22 @@
 module github.com/taigrr/elevenlabs-mcp
 
-go 1.25.2
+go 1.26.2
 
 require (
 	github.com/gopxl/beep/v2 v2.1.1
-	github.com/modelcontextprotocol/go-sdk v1.0.0
+	github.com/modelcontextprotocol/go-sdk v1.5.0
 	github.com/taigrr/elevenlabs v0.1.18
 )
 
 require (
-	github.com/ebitengine/oto/v3 v3.3.3 // indirect
-	github.com/ebitengine/purego v0.8.4 // indirect
-	github.com/google/jsonschema-go v0.3.0 // indirect
+	github.com/ebitengine/oto/v3 v3.4.0 // indirect
+	github.com/ebitengine/purego v0.10.0 // indirect
+	github.com/google/jsonschema-go v0.4.2 // indirect
 	github.com/hajimehoshi/go-mp3 v0.3.4 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
+	github.com/segmentio/asm v1.2.1 // indirect
+	github.com/segmentio/encoding v0.5.4 // indirect
 	github.com/yosida95/uritemplate/v3 v3.0.2 // indirect
-	golang.org/x/sys v0.35.0 // indirect
+	golang.org/x/oauth2 v0.36.0 // indirect
+	golang.org/x/sys v0.43.0 // indirect
 )

go.sum

@@ -1,34 +1,42 @@
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/ebitengine/oto/v3 v3.3.3 h1:m6RV69OqoXYSWCDsHXN9rc07aDuDstGHtait7HXSM7g=
-github.com/ebitengine/oto/v3 v3.3.3/go.mod h1:MZeb/lwoC4DCOdiTIxYezrURTw7EvK/yF863+tmBI+U=
-github.com/ebitengine/purego v0.8.4 h1:CF7LEKg5FFOsASUj0+QwaXf8Ht6TlFxg09+S9wz0omw=
-github.com/ebitengine/purego v0.8.4/go.mod h1:iIjxzd6CiRiOG0UyXP+V1+jWqUXVjPKLAI0mRfJZTmQ=
+github.com/ebitengine/oto/v3 v3.4.0 h1:br0PgASsEWaoWn38b2Goe7m1GKFYfNgnsjSd5Gg+/bQ=
+github.com/ebitengine/oto/v3 v3.4.0/go.mod h1:IOleLVD0m+CMak3mRVwsYY8vTctQgOM0iiL6S7Ar7eI=
+github.com/ebitengine/purego v0.10.0 h1:QIw4xfpWT6GWTzaW5XEKy3HXoqrJGx1ijYHzTF0/ISU=
+github.com/ebitengine/purego v0.10.0/go.mod h1:iIjxzd6CiRiOG0UyXP+V1+jWqUXVjPKLAI0mRfJZTmQ=
+github.com/golang-jwt/jwt/v5 v5.3.1 h1:kYf81DTWFe7t+1VvL7eS+jKFVWaUnK9cB1qbwn63YCY=
+github.com/golang-jwt/jwt/v5 v5.3.1/go.mod h1:fxCRLWMO43lRc8nhHWY6LGqRcf+1gQWArsqaEUEa5bE=
 github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
 github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
-github.com/google/jsonschema-go v0.3.0 h1:6AH2TxVNtk3IlvkkhjrtbUc4S8AvO0Xii0DxIygDg+Q=
-github.com/google/jsonschema-go v0.3.0/go.mod h1:r5quNTdLOYEz95Ru18zA0ydNbBuYoo9tgaYcxEYhJVE=
+github.com/google/jsonschema-go v0.4.2 h1:tmrUohrwoLZZS/P3x7ex0WAVknEkBZM46iALbcqoRA8=
+github.com/google/jsonschema-go v0.4.2/go.mod h1:r5quNTdLOYEz95Ru18zA0ydNbBuYoo9tgaYcxEYhJVE=
 github.com/gopxl/beep/v2 v2.1.1 h1:6FYIYMm2qPAdWkjX+7xwKrViS1x0Po5kDMdRkq8NVbU=
 github.com/gopxl/beep/v2 v2.1.1/go.mod h1:ZAm9TGQ9lvpoiFLd4zf5B1IuyxZhgRACMId1XJbaW0E=
 github.com/hajimehoshi/go-mp3 v0.3.4 h1:NUP7pBYH8OguP4diaTZ9wJbUbk3tC0KlfzsEpWmYj68=
 github.com/hajimehoshi/go-mp3 v0.3.4/go.mod h1:fRtZraRFcWb0pu7ok0LqyFhCUrPeMsGRSVop0eemFmo=
 github.com/hajimehoshi/oto/v2 v2.3.1/go.mod h1:seWLbgHH7AyUMYKfKYT9pg7PhUu9/SisyJvNTT+ASQo=
-github.com/modelcontextprotocol/go-sdk v1.0.0 h1:Z4MSjLi38bTgLrd/LjSmofqRqyBiVKRyQSJgw8q8V74=
-github.com/modelcontextprotocol/go-sdk v1.0.0/go.mod h1:nYtYQroQ2KQiM0/SbyEPUWQ6xs4B95gJjEalc9AQyOs=
+github.com/modelcontextprotocol/go-sdk v1.5.0 h1:CHU0FIX9kpueNkxuYtfYQn1Z0slhFzBZuq+x6IiblIU=
+github.com/modelcontextprotocol/go-sdk v1.5.0/go.mod h1:gggDIhoemhWs3BGkGwd1umzEXCEMMvAnhTrnbXJKKKA=
 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/segmentio/asm v1.2.1 h1:DTNbBqs57ioxAD4PrArqftgypG4/qNpXoJx8TVXxPR0=
+github.com/segmentio/asm v1.2.1/go.mod h1:BqMnlJP91P8d+4ibuonYZw9mfnzI9HfxselHZr5aAcs=
+github.com/segmentio/encoding v0.5.4 h1:OW1VRern8Nw6ITAtwSZ7Idrl3MXCFwXHPgqESYfvNt0=
+github.com/segmentio/encoding v0.5.4/go.mod h1:HS1ZKa3kSN32ZHVZ7ZLPLXWvOVIiZtyJnO1gPH1sKt0=
 github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
 github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 github.com/taigrr/elevenlabs v0.1.18 h1:ZvRsLjzV4ov6Rdls7MNFKvcknLc527RR6beV6pjukJU=
 github.com/taigrr/elevenlabs v0.1.18/go.mod h1:ardwj7FGIQbpvRl+UpdRzVnxOuo7QQxqC3YhFcvY1gM=
 github.com/yosida95/uritemplate/v3 v3.0.2 h1:Ed3Oyj9yrmi9087+NczuL5BwkIc4wvTb5zIM+UJPGz4=
 github.com/yosida95/uritemplate/v3 v3.0.2/go.mod h1:ILOh0sOhIJR3+L/8afwt/kE++YT040gmv5BQTMR2HP4=
+golang.org/x/oauth2 v0.36.0 h1:peZ/1z27fi9hUOFCAZaHyrpWG5lwe0RJEEEeH0ThlIs=
+golang.org/x/oauth2 v0.36.0/go.mod h1:YDBUJMTkDnJS+A4BP4eZBjCqtokkg1hODuPjwiGPO7Q=
 golang.org/x/sys v0.0.0-20220712014510-0a85c31ab51e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.35.0 h1:vz1N37gP5bs89s7He8XuIYXpyY0+QlsKmzipCbUtyxI=
-golang.org/x/sys v0.35.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
-golang.org/x/tools v0.34.0 h1:qIpSLOxeCYGg9TrcJokLBG4KFA6d795g0xkBkiESGlo=
-golang.org/x/tools v0.34.0/go.mod h1:pAP9OwEaY1CAW3HOmg3hLZC5Z0CCmzjAF2UQMSqNARg=
+golang.org/x/sys v0.43.0 h1:Rlag2XtaFTxp19wS8MXlJwTvoh8ArU6ezoyFsMyCTNI=
+golang.org/x/sys v0.43.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
+golang.org/x/tools v0.42.0 h1:uNgphsn75Tdz5Ji2q36v/nsFSfR/9BRFvqhGBaJGd5k=
+golang.org/x/tools v0.42.0/go.mod h1:Ma6lCIwGZvHK6XtgbswSoWroEkhugApmsXyrUmBhfr0=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

internal/ximcp/audio_test.go

@@ -0,0 +1,143 @@
+package ximcp
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func TestGenerateRandomHex(t *testing.T) {
+	hex1 := generateRandomHex(RandomHexLength)
+	hex2 := generateRandomHex(RandomHexLength)
+
+	if len(hex1) != RandomHexLength {
+		t.Errorf("expected length %d, got %d", RandomHexLength, len(hex1))
+	}
+
+	if len(hex2) != RandomHexLength {
+		t.Errorf("expected length %d, got %d", RandomHexLength, len(hex2))
+	}
+
+	// Two random hex strings should almost certainly differ
+	if hex1 == hex2 {
+		t.Error("two consecutive random hex values should differ")
+	}
+
+	// Verify hex characters only
+	for _, c := range hex1 {
+		if !strings.ContainsRune("0123456789abcdef", c) {
+			t.Errorf("non-hex character in output: %c", c)
+		}
+	}
+}
+
+func TestGenerateFilePath(t *testing.T) {
+	s := &Server{}
+
+	path := s.generateFilePath()
+
+	if !strings.HasPrefix(path, AudioDirectory+string(filepath.Separator)) {
+		t.Errorf("path should start with %s/, got %q", AudioDirectory, path)
+	}
+
+	if !strings.HasSuffix(path, ".mp3") {
+		t.Errorf("path should end with .mp3, got %q", path)
+	}
+
+	// Two paths should differ (different timestamps or random hex)
+	path2 := s.generateFilePath()
+	if path == path2 {
+		t.Error("two consecutive file paths should differ")
+	}
+}
+
+func TestEnsureDirectoryExists(t *testing.T) {
+	s := &Server{}
+
+	tmpDir := t.TempDir()
+	nested := filepath.Join(tmpDir, "a", "b", "c", "file.mp3")
+
+	err := s.ensureDirectoryExists(nested)
+	if err != nil {
+		t.Fatalf("ensureDirectoryExists failed: %v", err)
+	}
+
+	dirPath := filepath.Dir(nested)
+	info, err := os.Stat(dirPath)
+	if err != nil {
+		t.Fatalf("directory not created: %v", err)
+	}
+	if !info.IsDir() {
+		t.Error("expected directory, got file")
+	}
+}
+
+func TestWriteAudioFile(t *testing.T) {
+	s := &Server{}
+
+	tmpDir := t.TempDir()
+	filePath := filepath.Join(tmpDir, "test.mp3")
+	data := []byte("fake audio data")
+
+	err := s.writeAudioFile(filePath, data)
+	if err != nil {
+		t.Fatalf("writeAudioFile failed: %v", err)
+	}
+
+	content, err := os.ReadFile(filePath)
+	if err != nil {
+		t.Fatalf("failed to read written file: %v", err)
+	}
+
+	if string(content) != string(data) {
+		t.Errorf("file content mismatch: got %q, want %q", content, data)
+	}
+}
+
+func TestWriteTextFile(t *testing.T) {
+	s := &Server{}
+
+	tmpDir := t.TempDir()
+	audioPath := filepath.Join(tmpDir, "test.mp3")
+	text := "This is the spoken text"
+
+	err := s.writeTextFile(audioPath, text)
+	if err != nil {
+		t.Fatalf("writeTextFile failed: %v", err)
+	}
+
+	expectedPath := filepath.Join(tmpDir, "test.txt")
+	content, err := os.ReadFile(expectedPath)
+	if err != nil {
+		t.Fatalf("failed to read text file: %v", err)
+	}
+
+	if string(content) != text {
+		t.Errorf("text file content mismatch: got %q, want %q", content, text)
+	}
+}
+
+func TestReadFileToAudioFileNotFound(t *testing.T) {
+	s := &Server{}
+
+	_, err := s.ReadFileToAudio("/nonexistent/file.txt")
+	if err == nil {
+		t.Error("expected error for nonexistent file")
+	}
+}
+
+func TestGenerateAudioNoVoice(t *testing.T) {
+	s := &Server{
+		currentVoice: nil,
+	}
+
+	_, err := s.GenerateAudio("test text")
+	if err == nil {
+		t.Error("expected error when no voice selected")
+	}
+
+	if !strings.Contains(err.Error(), "no voice selected") {
+		t.Errorf("expected 'no voice selected' error, got: %v", err)
+	}
+}

internal/ximcp/history_test.go

@@ -0,0 +1,148 @@
+package ximcp
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestCreateSummary(t *testing.T) {
+	s := &Server{}
+
+	tests := []struct {
+		name     string
+		input    string
+		expected string
+	}{
+		{
+			name:     "short text unchanged",
+			input:    "Hello world",
+			expected: "Hello world",
+		},
+		{
+			name:     "exactly max words",
+			input:    "one two three four five six seven eight nine ten",
+			expected: "one two three four five six seven eight nine ten",
+		},
+		{
+			name:     "exceeds max words truncated",
+			input:    "one two three four five six seven eight nine ten eleven twelve",
+			expected: "one two three four five six seven eight nine ten...",
+		},
+		{
+			name:     "empty text",
+			input:    "",
+			expected: "",
+		},
+		{
+			name:     "whitespace only",
+			input:    "   \t\n  ",
+			expected: "",
+		},
+		{
+			name:     "text with extra whitespace trimmed at edges",
+			input:    "  hello   world  ",
+			expected: "hello   world",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := s.createSummary(tt.input)
+			if result != tt.expected {
+				t.Errorf("createSummary(%q) = %q, want %q", tt.input, result, tt.expected)
+			}
+		})
+	}
+}
+
+func TestGetAudioHistoryEmptyDir(t *testing.T) {
+	s := &Server{}
+
+	// Temporarily override the audio directory to a non-existent path
+	origDir := AudioDirectory
+	t.Cleanup(func() {
+		// AudioDirectory is a const, so we test the behavior as-is
+		_ = origDir
+	})
+
+	// GetAudioHistory with non-existent directory should return empty
+	tmpDir := t.TempDir()
+	nonExistent := filepath.Join(tmpDir, "does-not-exist")
+
+	// We can't override the const, so test processAudioFiles directly
+	entries, err := os.ReadDir(nonExistent)
+	if err != nil {
+		// Expected — directory doesn't exist
+		if !os.IsNotExist(err) {
+			t.Fatalf("unexpected error: %v", err)
+		}
+		return
+	}
+
+	result := s.processAudioFiles(entries)
+	if len(result) != 0 {
+		t.Errorf("expected empty result, got %d files", len(result))
+	}
+}
+
+func TestProcessAudioFiles(t *testing.T) {
+	s := &Server{}
+
+	tmpDir := t.TempDir()
+
+	// Create test files
+	mp3File := filepath.Join(tmpDir, "test.mp3")
+	txtFile := filepath.Join(tmpDir, "test.txt")
+	otherFile := filepath.Join(tmpDir, "readme.md")
+
+	if err := os.WriteFile(mp3File, []byte("fake audio"), 0644); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(txtFile, []byte("Hello world test"), 0644); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(otherFile, []byte("not audio"), 0644); err != nil {
+		t.Fatal(err)
+	}
+
+	entries, err := os.ReadDir(tmpDir)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	result := s.processAudioFiles(entries)
+
+	// Should only include .mp3 files
+	if len(result) != 1 {
+		t.Fatalf("expected 1 audio file, got %d", len(result))
+	}
+
+	if result[0].Name != "test.mp3" {
+		t.Errorf("expected name 'test.mp3', got %q", result[0].Name)
+	}
+}
+
+func TestGetAudioSummary(t *testing.T) {
+	s := &Server{}
+
+	tmpDir := t.TempDir()
+
+	// Create a text file alongside an mp3
+	txtPath := filepath.Join(tmpDir, "audio.txt")
+	if err := os.WriteFile(txtPath, []byte("This is a test summary"), 0644); err != nil {
+		t.Fatal(err)
+	}
+
+	// getAudioSummary uses AudioDirectory const, so we test createSummary instead
+	summary := s.createSummary("This is a test summary")
+	if summary != "This is a test summary" {
+		t.Errorf("unexpected summary: %q", summary)
+	}
+
+	// Test with no text file fallback
+	summary = s.createSummary("")
+	if summary != "" {
+		t.Errorf("expected empty summary, got %q", summary)
+	}
+}

internal/ximcp/server_test.go

@@ -0,0 +1,182 @@
+package ximcp
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/taigrr/elevenlabs/client/types"
+)
+
+func TestFindVoiceByID(t *testing.T) {
+	s := &Server{
+		voices: []types.VoiceResponseModel{
+			{VoiceID: "abc123", Name: "Alice"},
+			{VoiceID: "def456", Name: "Bob"},
+			{VoiceID: "ghi789", Name: "Charlie"},
+		},
+	}
+
+	tests := []struct {
+		name     string
+		voiceID  string
+		expected string
+		found    bool
+	}{
+		{"find first voice", "abc123", "Alice", true},
+		{"find middle voice", "def456", "Bob", true},
+		{"find last voice", "ghi789", "Charlie", true},
+		{"voice not found", "zzz999", "", false},
+		{"empty id", "", "", false},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			voice := s.findVoiceByID(tt.voiceID)
+			if tt.found {
+				if voice == nil {
+					t.Fatal("expected voice, got nil")
+				}
+				if voice.Name != tt.expected {
+					t.Errorf("expected name %q, got %q", tt.expected, voice.Name)
+				}
+			} else {
+				if voice != nil {
+					t.Errorf("expected nil, got voice %q", voice.Name)
+				}
+			}
+		})
+	}
+}
+
+func TestSetDefaultVoiceIfNeeded(t *testing.T) {
+	t.Run("sets first voice when no current", func(t *testing.T) {
+		s := &Server{
+			voices: []types.VoiceResponseModel{
+				{VoiceID: "abc123", Name: "Alice"},
+				{VoiceID: "def456", Name: "Bob"},
+			},
+			currentVoice: nil,
+		}
+
+		s.setDefaultVoiceIfNeeded()
+
+		if s.currentVoice == nil {
+			t.Fatal("expected current voice to be set")
+		}
+		if s.currentVoice.Name != "Alice" {
+			t.Errorf("expected first voice 'Alice', got %q", s.currentVoice.Name)
+		}
+	})
+
+	t.Run("does not override existing voice", func(t *testing.T) {
+		bob := types.VoiceResponseModel{VoiceID: "def456", Name: "Bob"}
+		s := &Server{
+			voices: []types.VoiceResponseModel{
+				{VoiceID: "abc123", Name: "Alice"},
+				bob,
+			},
+			currentVoice: &bob,
+		}
+
+		s.setDefaultVoiceIfNeeded()
+
+		if s.currentVoice.Name != "Bob" {
+			t.Errorf("expected voice to remain 'Bob', got %q", s.currentVoice.Name)
+		}
+	})
+
+	t.Run("no voices available", func(t *testing.T) {
+		s := &Server{
+			voices:       []types.VoiceResponseModel{},
+			currentVoice: nil,
+		}
+
+		s.setDefaultVoiceIfNeeded()
+
+		if s.currentVoice != nil {
+			t.Error("expected no voice when list is empty")
+		}
+	})
+}
+
+func TestSetVoice(t *testing.T) {
+	s := &Server{
+		voices: []types.VoiceResponseModel{
+			{VoiceID: "abc123", Name: "Alice"},
+			{VoiceID: "def456", Name: "Bob"},
+		},
+	}
+
+	t.Run("set valid voice", func(t *testing.T) {
+		voice, err := s.SetVoice("def456")
+		if err != nil {
+			t.Fatalf("unexpected error: %v", err)
+		}
+		if voice.Name != "Bob" {
+			t.Errorf("expected 'Bob', got %q", voice.Name)
+		}
+		if s.currentVoice.VoiceID != "def456" {
+			t.Error("currentVoice not updated")
+		}
+	})
+
+	t.Run("set invalid voice", func(t *testing.T) {
+		_, err := s.SetVoice("nonexistent")
+		if err == nil {
+			t.Error("expected error for nonexistent voice")
+		}
+	})
+}
+
+func TestFormatVoiceList(t *testing.T) {
+	current := types.VoiceResponseModel{VoiceID: "abc123", Name: "Alice", Category: "premade"}
+	s := &Server{}
+
+	voices := []types.VoiceResponseModel{
+		current,
+		{VoiceID: "def456", Name: "Bob", Category: "cloned"},
+	}
+
+	result := s.formatVoiceList(voices, &current)
+
+	if result == "" {
+		t.Error("expected non-empty result")
+	}
+
+	// Current voice should be marked with asterisk
+	if !contains(result, "* Alice") {
+		t.Error("expected current voice to be marked with asterisk")
+	}
+
+	// Other voice should not be marked
+	if contains(result, "* Bob") {
+		t.Error("non-current voice should not have asterisk marker")
+	}
+
+	// Both voices should appear
+	if !contains(result, "Alice") || !contains(result, "Bob") {
+		t.Error("both voices should appear in output")
+	}
+
+	if !contains(result, "Currently selected: Alice") {
+		t.Error("expected currently selected line")
+	}
+}
+
+func TestFormatVoiceListNoSelection(t *testing.T) {
+	s := &Server{}
+
+	voices := []types.VoiceResponseModel{
+		{VoiceID: "abc123", Name: "Alice", Category: "premade"},
+	}
+
+	result := s.formatVoiceList(voices, nil)
+
+	if !contains(result, "No voice currently selected") {
+		t.Error("expected 'No voice currently selected' when nil")
+	}
+}
+
+func contains(s, substr string) bool {
+	return strings.Contains(s, substr)
+}