diff --git a/internal/cmd/down.go b/internal/cmd/down.go
index 19d7da36..0d9a2653 100644
--- a/internal/cmd/down.go
+++ b/internal/cmd/down.go
@@ -95,7 +95,7 @@ func runDown(cmd *cobra.Command, args []string) error {
 		if err != nil {
 			return fmt.Errorf("cannot proceed: %w", err)
 		}
-		defer lock.Unlock()
+		defer func() { _ = lock.Unlock() }()
 	}
 	allOK := true
 
diff --git a/internal/cmd/install.go b/internal/cmd/install.go
index 036777a9..00115c07 100644
--- a/internal/cmd/install.go
+++ b/internal/cmd/install.go
@@ -308,7 +308,7 @@ func runInstall(cmd *cobra.Command, args []string) error {
 	return nil
 }
 
-func createMayorCLAUDEmd(mayorDir, townRoot string) error {
+func createMayorCLAUDEmd(mayorDir, _ string) error {
 	// Create a minimal bootstrap pointer instead of full context.
 	// Full context is injected ephemerally by `gt prime` at session start.
 	// This keeps the on-disk file small (<30 lines) per priming architecture.
diff --git a/internal/cmd/root.go b/internal/cmd/root.go
index fd7dbd34..35195465 100644
--- a/internal/cmd/root.go
+++ b/internal/cmd/root.go
@@ -100,7 +100,7 @@ func warnIfTownRootOffMain() {
 // checkBeadsDependency verifies beads meets minimum version requirements.
 // Skips check for exempt commands (version, help, completion).
 // Deprecated: Use persistentPreRun instead, which calls CheckBeadsVersion.
-func checkBeadsDependency(cmd *cobra.Command, args []string) error {
+func checkBeadsDependency(cmd *cobra.Command, _ []string) error {
 	// Get the root command name being run
 	cmdName := cmd.Name()
 
@@ -142,7 +142,7 @@ func checkStaleBinaryWarning() {
 
 	if info.IsStale {
 		staleBinaryWarned = true
-		os.Setenv("GT_STALE_WARNED", "1")
+		_ = os.Setenv("GT_STALE_WARNED", "1")
 
 		msg := fmt.Sprintf("gt binary is stale (built from %s, repo at %s)",
 			version.ShortCommit(info.BinaryCommit), version.ShortCommit(info.RepoCommit))
diff --git a/internal/doctor/priming_check.go b/internal/doctor/priming_check.go
index df318e51..a97327b1 100644
--- a/internal/doctor/priming_check.go
+++ b/internal/doctor/priming_check.go
@@ -111,7 +111,7 @@ func (c *PrimingCheck) Run(ctx *CheckContext) *CheckResult {
 }
 
 // checkAgentPriming checks priming configuration for a specific agent.
-func (c *PrimingCheck) checkAgentPriming(townRoot, agentDir, agentType string) []primingIssue {
+func (c *PrimingCheck) checkAgentPriming(townRoot, agentDir, _ string) []primingIssue {
 	var issues []primingIssue
 
 	agentPath := filepath.Join(townRoot, agentDir)