Prevent endless loops during connectivity issues.

cmd/hooks/post-tool-use/main.go

@@ -17,11 +17,50 @@ type Input struct {
 	ToolUseID    string      `json:"tool_use_id"`
 }
 
+// skipTools lists tools that never produce useful observations.
+// Skip the HTTP call entirely for these to reduce overhead during heavy tool usage.
+var skipTools = map[string]bool{
+	// Internal tracking tools (but NOT TodoWrite - it captures planned work)
+	"Task":       true,
+	"TaskOutput": true,
+
+	// File discovery tools (just listings, no insights)
+	"Glob":      true,
+	"ListDir":   true,
+	"LS":        true,
+	"KillShell": true,
+
+	// Question/interaction tools (no code insights)
+	"AskUserQuestion": true,
+
+	// Plan mode tools (planning, not execution)
+	"EnterPlanMode": true,
+	"ExitPlanMode":  true,
+
+	// Skill/command execution (meta-operations)
+	"Skill":        true,
+	"SlashCommand": true,
+
+	// Read is high-volume and rarely produces insights worth the overhead
+	// The processor would skip most reads anyway after filtering
+	"Read": true,
+
+	// Search tools are for finding, not modifying
+	"Grep":      true,
+	"WebSearch": true,
+}
+
 func main() {
 	hooks.RunHook("PostToolUse", handlePostToolUse)
 }
 
 func handlePostToolUse(ctx *hooks.HookContext, input *Input) (string, error) {
+	// Skip HTTP call entirely for tools that never produce useful observations.
+	// This significantly reduces overhead during heavy tool usage.
+	if skipTools[input.ToolName] {
+		return "", nil
+	}
+
 	fmt.Fprintf(os.Stderr, "[post-tool-use] %s\n", input.ToolName)
 
 	// Send observation to worker