diff --git a/pkg/cmd/extension/browse/browse.go b/pkg/cmd/extension/browse/browse.go
index 21d254956..3df92eae6 100644
--- a/pkg/cmd/extension/browse/browse.go
+++ b/pkg/cmd/extension/browse/browse.go
@@ -25,6 +25,7 @@ import (
 
 const pagingOffset = 24
 
+// ExtBrowseOpts holds the options for the extension browse command.
 type ExtBrowseOpts struct {
 	Cmd          *cobra.Command
 	Browser      ibrowser
@@ -63,6 +64,7 @@ type extEntry struct {
 	description string
 }
 
+// Title returns the display title for the extension entry including status indicators.
 func (e extEntry) Title() string {
 	var installed string
 	var official string
@@ -78,6 +80,7 @@ func (e extEntry) Title() string {
 	return fmt.Sprintf("%s%s%s", e.FullName, official, installed)
 }
 
+// Description returns the extension description or a default placeholder.
 func (e extEntry) Description() string {
 	if e.description == "" {
 		return "no description provided"
@@ -103,9 +106,14 @@ type wGroup interface {
 
 type fakeGroup struct{}
 
+// Add is a no-op implementation of the wGroup interface.
 func (w *fakeGroup) Add(int) {}
-func (w *fakeGroup) Done()   {}
-func (w *fakeGroup) Wait()   {}
+
+// Done is a no-op implementation of the wGroup interface.
+func (w *fakeGroup) Done() {}
+
+// Wait is a no-op implementation of the wGroup interface.
+func (w *fakeGroup) Wait() {}
 
 func newExtList(opts ExtBrowseOpts, ui uiRegistry, extEntries []extEntry) *extList {
 	ui.List.SetTitleColor(tcell.ColorWhite)
@@ -219,10 +227,12 @@ func (el *extList) toggleSelected(verb string) {
 	}
 }
 
+// InstallSelected installs the currently highlighted extension.
 func (el *extList) InstallSelected() {
 	el.toggleSelected("install")
 }
 
+// RemoveSelected removes the currently highlighted extension.
 func (el *extList) RemoveSelected() {
 	el.toggleSelected("remove")
 }
@@ -233,15 +243,18 @@ func (el *extList) toggleInstalled(ix int) {
 	el.extEntries[ix] = ee
 }
 
+// Focus sets the application focus to the extension list.
 func (el *extList) Focus() {
 	el.app.SetFocus(el.ui.List)
 }
 
+// Refresh resets the list and reapplies the current filter.
 func (el *extList) Refresh() {
 	el.Reset()
 	el.Filter(el.filter)
 }
 
+// Reset clears the list and repopulates it with all extension entries.
 func (el *extList) Reset() {
 	el.ui.List.Clear()
 	for _, ee := range el.extEntries {
@@ -249,10 +262,12 @@ func (el *extList) Reset() {
 	}
 }
 
+// PageDown moves the list selection down by one page.
 func (el *extList) PageDown() {
 	el.ui.List.SetCurrentItem(el.ui.List.GetCurrentItem() + pagingOffset)
 }
 
+// PageUp moves the list selection up by one page.
 func (el *extList) PageUp() {
 	i := el.ui.List.GetCurrentItem() - pagingOffset
 	if i < 0 {
@@ -261,10 +276,12 @@ func (el *extList) PageUp() {
 	el.ui.List.SetCurrentItem(i)
 }
 
+// ScrollDown moves the list selection down by one item.
 func (el *extList) ScrollDown() {
 	el.ui.List.SetCurrentItem(el.ui.List.GetCurrentItem() + 1)
 }
 
+// ScrollUp moves the list selection up by one item.
 func (el *extList) ScrollUp() {
 	i := el.ui.List.GetCurrentItem() - 1
 	if i < 0 {
@@ -273,6 +290,7 @@ func (el *extList) ScrollUp() {
 	el.ui.List.SetCurrentItem(i)
 }
 
+// FindSelected returns the currently selected extension entry and its index.
 func (el *extList) FindSelected() (extEntry, int) {
 	if el.ui.List.GetItemCount() == 0 {
 		return extEntry{}, -1
@@ -286,6 +304,7 @@ func (el *extList) FindSelected() (extEntry, int) {
 	return extEntry{}, -1
 }
 
+// Filter narrows the displayed list to entries matching the given text.
 func (el *extList) Filter(text string) {
 	el.filter = text
 	if text == "" {
@@ -377,6 +396,7 @@ func getExtensions(opts ExtBrowseOpts) ([]extEntry, error) {
 	return extEntries, nil
 }
 
+// ExtBrowse launches the interactive TUI for browsing and managing extensions.
 func ExtBrowse(opts ExtBrowseOpts) error {
 	if opts.Debug {
 		f, err := os.CreateTemp("", "extBrowse-*.txt")
diff --git a/pkg/cmd/extension/browse/rg.go b/pkg/cmd/extension/browse/rg.go
index 4884b1779..817befde2 100644
--- a/pkg/cmd/extension/browse/rg.go
+++ b/pkg/cmd/extension/browse/rg.go
@@ -20,6 +20,7 @@ func newReadmeGetter(client *http.Client, cacheTTL time.Duration) *readmeGetter
 	}
 }
 
+// Get fetches the README content for the given repository full name.
 func (g *readmeGetter) Get(repoFullName string) (string, error) {
 	repo, err := ghrepo.FromFullName(repoFullName)
 	if err != nil {
diff --git a/pkg/cmd/extension/command.go b/pkg/cmd/extension/command.go
index 057f91140..d0fa21971 100644
--- a/pkg/cmd/extension/command.go
+++ b/pkg/cmd/extension/command.go
@@ -25,6 +25,7 @@ import (
 
 var alreadyInstalledError = errors.New("alreadyInstalledError")
 
+// NewCmdExtension creates the cobra command for managing gh extensions.
 func NewCmdExtension(f *cmdutil.Factory) *cobra.Command {
 	m := f.ExtensionManager
 	io := f.IOStreams
diff --git a/pkg/cmd/extension/extension.go b/pkg/cmd/extension/extension.go
index f30bf63c1..06fcdf9aa 100644
--- a/pkg/cmd/extension/extension.go
+++ b/pkg/cmd/extension/extension.go
@@ -16,14 +16,19 @@ import (
 
 const manifestName = "manifest.yml"
 
+// ExtensionKind indicates the type of a gh CLI extension.
 type ExtensionKind int
 
 const (
+	// GitKind represents a git-based extension.
 	GitKind ExtensionKind = iota
+	// BinaryKind represents a precompiled binary extension.
 	BinaryKind
+	// LocalKind represents a locally developed extension.
 	LocalKind
 )
 
+// Extension represents an installed gh CLI extension.
 type Extension struct {
 	path       string
 	kind       ExtensionKind
@@ -40,22 +45,27 @@ type Extension struct {
 	owner          string
 }
 
+// Name returns the extension name without the "gh-" prefix.
 func (e *Extension) Name() string {
 	return strings.TrimPrefix(filepath.Base(e.path), "gh-")
 }
 
+// Path returns the filesystem path to the extension executable.
 func (e *Extension) Path() string {
 	return e.path
 }
 
+// IsLocal returns true if the extension is a locally developed extension.
 func (e *Extension) IsLocal() bool {
 	return e.kind == LocalKind
 }
 
+// IsBinary returns true if the extension is a precompiled binary.
 func (e *Extension) IsBinary() bool {
 	return e.kind == BinaryKind
 }
 
+// URL returns the repository URL of the extension.
 func (e *Extension) URL() string {
 	e.mu.RLock()
 	if e.url != "" {
@@ -85,6 +95,7 @@ func (e *Extension) URL() string {
 	return e.url
 }
 
+// CurrentVersion returns the currently installed version of the extension.
 func (e *Extension) CurrentVersion() string {
 	e.mu.RLock()
 	if e.currentVersion != "" {
@@ -113,6 +124,7 @@ func (e *Extension) CurrentVersion() string {
 	return e.currentVersion
 }
 
+// LatestVersion returns the latest available version of the extension.
 func (e *Extension) LatestVersion() string {
 	e.mu.RLock()
 	if e.latestVersion != "" {
@@ -147,6 +159,7 @@ func (e *Extension) LatestVersion() string {
 	return e.latestVersion
 }
 
+// IsPinned returns true if the extension is pinned to a specific version.
 func (e *Extension) IsPinned() bool {
 	e.mu.RLock()
 	if e.isPinned != nil {
@@ -179,6 +192,7 @@ func (e *Extension) IsPinned() bool {
 	return *e.isPinned
 }
 
+// Owner returns the GitHub owner of the extension repository.
 func (e *Extension) Owner() string {
 	e.mu.RLock()
 	if e.owner != "" {
@@ -211,6 +225,7 @@ func (e *Extension) Owner() string {
 	return e.owner
 }
 
+// UpdateAvailable returns true if a newer version of the extension exists.
 func (e *Extension) UpdateAvailable() bool {
 	if e.IsLocal() ||
 		e.CurrentVersion() == "" ||
diff --git a/pkg/cmd/extension/git.go b/pkg/cmd/extension/git.go
index 58ef0ca12..0a3a7da58 100644
--- a/pkg/cmd/extension/git.go
+++ b/pkg/cmd/extension/git.go
@@ -21,14 +21,17 @@ type gitExecuter struct {
 	client *git.Client
 }
 
+// CheckoutBranch checks out the specified branch in the repository.
 func (g *gitExecuter) CheckoutBranch(branch string) error {
 	return g.client.CheckoutBranch(context.Background(), branch)
 }
 
+// Clone clones a repository from the given URL with optional arguments.
 func (g *gitExecuter) Clone(cloneURL string, cloneArgs []string) (string, error) {
 	return g.client.Clone(context.Background(), cloneURL, cloneArgs)
 }
 
+// CommandOutput runs a git command and returns its output.
 func (g *gitExecuter) CommandOutput(args []string) ([]byte, error) {
 	cmd, err := g.client.Command(context.Background(), args...)
 	if err != nil {
@@ -37,24 +40,29 @@ func (g *gitExecuter) CommandOutput(args []string) ([]byte, error) {
 	return cmd.Output()
 }
 
+// Config retrieves a git configuration value by name.
 func (g *gitExecuter) Config(name string) (string, error) {
 	return g.client.Config(context.Background(), name)
 }
 
+// Fetch fetches refs from the specified remote.
 func (g *gitExecuter) Fetch(remote string, refspec string) error {
 	return g.client.Fetch(context.Background(), remote, refspec)
 }
 
+// ForRepo returns a new gitClient scoped to the given repository directory.
 func (g *gitExecuter) ForRepo(repoDir string) gitClient {
 	gc := g.client.Copy()
 	gc.RepoDir = repoDir
 	return &gitExecuter{client: gc}
 }
 
+// Pull pulls changes from the specified remote and branch.
 func (g *gitExecuter) Pull(remote, branch string) error {
 	return g.client.Pull(context.Background(), remote, branch)
 }
 
+// Remotes returns the set of configured git remotes.
 func (g *gitExecuter) Remotes() (git.RemoteSet, error) {
 	return g.client.Remotes(context.Background())
 }
diff --git a/pkg/cmd/extension/manager.go b/pkg/cmd/extension/manager.go
index b7f1f1c0c..58407c5f3 100644
--- a/pkg/cmd/extension/manager.go
+++ b/pkg/cmd/extension/manager.go
@@ -30,17 +30,20 @@ import (
 // ErrInitialCommitFailed indicates the initial commit when making a new extension failed.
 var ErrInitialCommitFailed = errors.New("initial commit failed")
 
+// ErrExtensionExecutableNotFound indicates that an installed extension has no executable.
 type ErrExtensionExecutableNotFound struct {
 	Dir  string
 	Name string
 }
 
+// Error returns a descriptive message about the missing executable.
 func (e *ErrExtensionExecutableNotFound) Error() string {
 	return fmt.Sprintf("an extension has been installed but there is no executable: executable file named \"%s\" in %s is required to run the extension after install. Perhaps you need to build it?\n", e.Name, e.Dir)
 }
 
 const darwinAmd64 = "darwin-amd64"
 
+// Manager handles installation, upgrade, and removal of gh CLI extensions.
 type Manager struct {
 	dataDir    func() string
 	updateDir  func() string
@@ -55,6 +58,7 @@ type Manager struct {
 	dryRunMode bool
 }
 
+// NewManager creates a new extension Manager with default settings.
 func NewManager(ios *iostreams.IOStreams, gc *git.Client) *Manager {
 	return &Manager{
 		dataDir: config.DataDir,
@@ -76,18 +80,22 @@ func NewManager(ios *iostreams.IOStreams, gc *git.Client) *Manager {
 	}
 }
 
+// SetConfig sets the configuration used by the Manager.
 func (m *Manager) SetConfig(cfg gh.Config) {
 	m.config = cfg
 }
 
+// SetClient sets the HTTP client used by the Manager.
 func (m *Manager) SetClient(client *http.Client) {
 	m.client = client
 }
 
+// EnableDryRunMode enables dry-run mode so that no changes are persisted.
 func (m *Manager) EnableDryRunMode() {
 	m.dryRunMode = true
 }
 
+// Dispatch executes an installed extension by name with the given I/O streams.
 func (m *Manager) Dispatch(args []string, stdin io.Reader, stdout, stderr io.Writer) (bool, error) {
 	if len(args) == 0 {
 		return false, errors.New("too few arguments in list")
@@ -133,6 +141,7 @@ func (m *Manager) Dispatch(args []string, stdin io.Reader, stdout, stderr io.Wri
 	return true, externalCmd.Run()
 }
 
+// List returns all installed extensions.
 func (m *Manager) List() []extensions.Extension {
 	exts, _ := m.list(false)
 	r := make([]extensions.Extension, len(exts))
@@ -205,6 +214,7 @@ func (m *Manager) populateLatestVersions(exts []*Extension) {
 	wg.Wait()
 }
 
+// InstallLocal installs a local extension from the given directory.
 func (m *Manager) InstallLocal(dir string) error {
 	name := filepath.Base(dir)
 	if err := m.cleanExtensionUpdateDir(name); err != nil {
@@ -451,6 +461,7 @@ var localExtensionUpgradeError = errors.New("local extensions can not be upgrade
 var upToDateError = errors.New("already up to date")
 var noExtensionsInstalledError = errors.New("no extensions installed")
 
+// Upgrade upgrades the named extension or all extensions if name is empty.
 func (m *Manager) Upgrade(name string, force bool) error {
 	// Fetch metadata during list only when upgrading all extensions.
 	// This is a performance improvement so that we don't make a
@@ -570,6 +581,7 @@ func (m *Manager) upgradeBinExtension(ext *Extension) error {
 	return m.installBin(repo, "")
 }
 
+// Remove uninstalls the named extension and cleans up its files.
 func (m *Manager) Remove(name string) error {
 	name = normalizeExtension(name)
 	targetDir := filepath.Join(m.installDir(), name)
@@ -609,6 +621,7 @@ var scriptTmpl string
 //go:embed ext_tmpls/buildScript.sh
 var buildScript []byte
 
+// Create scaffolds a new extension project with the given name and template type.
 func (m *Manager) Create(name string, tmplType extensions.ExtTemplateType) error {
 	if _, err := m.gitClient.CommandOutput([]string{"init", "--quiet", name}); err != nil {
 		return err
diff --git a/pkg/cmd/extension/mocks.go b/pkg/cmd/extension/mocks.go
index 4de68cf7e..c53bf34fb 100644
--- a/pkg/cmd/extension/mocks.go
+++ b/pkg/cmd/extension/mocks.go
@@ -9,31 +9,37 @@ type mockGitClient struct {
 	mock.Mock
 }
 
+// CheckoutBranch mocks checking out a branch.
 func (g *mockGitClient) CheckoutBranch(branch string) error {
 	args := g.Called(branch)
 	return args.Error(0)
 }
 
+// Clone mocks cloning a repository.
 func (g *mockGitClient) Clone(cloneURL string, cloneArgs []string) (string, error) {
 	args := g.Called(cloneURL, cloneArgs)
 	return args.String(0), args.Error(1)
 }
 
+// CommandOutput mocks running a git command and returning its output.
 func (g *mockGitClient) CommandOutput(commandArgs []string) ([]byte, error) {
 	args := g.Called(commandArgs)
 	return []byte(args.String(0)), args.Error(1)
 }
 
+// Config mocks retrieving a git configuration value.
 func (g *mockGitClient) Config(name string) (string, error) {
 	args := g.Called(name)
 	return args.String(0), args.Error(1)
 }
 
+// Fetch mocks fetching refs from a remote.
 func (g *mockGitClient) Fetch(remote string, refspec string) error {
 	args := g.Called(remote, refspec)
 	return args.Error(0)
 }
 
+// ForRepo mocks returning a gitClient scoped to a repository directory.
 func (g *mockGitClient) ForRepo(repoDir string) gitClient {
 	args := g.Called(repoDir)
 	if v, ok := args.Get(0).(*mockGitClient); ok {
@@ -42,11 +48,13 @@ func (g *mockGitClient) ForRepo(repoDir string) gitClient {
 	return nil
 }
 
+// Pull mocks pulling changes from a remote branch.
 func (g *mockGitClient) Pull(remote, branch string) error {
 	args := g.Called(remote, branch)
 	return args.Error(0)
 }
 
+// Remotes mocks returning the set of configured git remotes.
 func (g *mockGitClient) Remotes() (git.RemoteSet, error) {
 	args := g.Called()
 	return nil, args.Error(1)