tier: built-in default cold table for known read-only tools

pkg/tools/execute/tier.go

@@ -2,10 +2,24 @@ package execute
 
 import "strings"
 
-// ResultTier implements tools.TierClassifier. It reads the tool script's
-// "ollie:tier" annotation to determine result retention. Returns "hot" if
-// no annotation is found.
+// defaultColdTools are tools whose results are consumed immediately and don't
+// need to persist verbatim in the message history.
+var defaultColdTools = map[string]string{
+	"file_read":      "cold",
+	"memory_recall":  "cold",
+	"web_fetch":      "cold",
+	"web_search":     "cold",
+	"lsp_definition": "cold",
+	"lsp_references": "cold",
+	"lsp_hover":      "cold",
+}
+
+// ResultTier implements tools.TierClassifier. Checks the built-in table first,
+// then falls back to the script's "ollie:tier" annotation.
 func (e *Server) ResultTier(name string) string {
+	if tier, ok := defaultColdTools[name]; ok {
+		return tier
+	}
 	code, err := ReadTool(name)
 	if err != nil {
 		return "hot"