chore(tools): centralize pagination cap helper

internal/tools/code_search.go

@@ -76,9 +76,7 @@ func (t *CodeSearch) Call(ctx context.Context, raw json.RawMessage) (json.RawMes
 	if args.Page < 1 {
 		args.Page = 1
 	}
-	if args.Limit < 1 || args.Limit > 50 {
-		args.Limit = 30
-	}
+	args.Limit = capLimit(args.Limit, 30)
 
 	if args.Repo != "" {
 		return t.singleRepo(ctx, args)

internal/tools/repo_list.go

@@ -48,10 +48,8 @@ func (t *RepoList) Call(ctx context.Context, raw json.RawMessage) (json.RawMessa
 	if err := t.a.Check(args.Owner); err != nil {
 		return nil, err
 	}
-	if args.Limit == 0 || args.Limit > 50 {
-		args.Limit = 30
-	}
-	if args.Page == 0 {
+	args.Limit = capLimit(args.Limit, 30)
+	if args.Page < 1 {
 		args.Page = 1
 	}
 	repos, err := t.c.ListRepos(ctx, args.Owner, args.Page, args.Limit)

internal/tools/repo_search.go

@@ -60,9 +60,7 @@ func (t *RepoSearch) Call(ctx context.Context, raw json.RawMessage) (json.RawMes
 	if args.Page < 1 {
 		args.Page = 1
 	}
-	if args.Limit < 1 || args.Limit > 50 {
-		args.Limit = 30
-	}
+	args.Limit = capLimit(args.Limit, 30)
 
 	repos, err := t.c.SearchRepos(ctx, args.Q, args.Owner, args.Page, args.Limit)
 	if err != nil {

internal/tools/tool.go

@@ -22,3 +22,14 @@ func parseArgs(raw json.RawMessage, dst any) error {
 }
 
 func _ctx(ctx context.Context) context.Context { return ctx } // stub for future hooks
+
+// capLimit returns a sane page size: 0 or negative → def, > 50 → 50.
+func capLimit(in, def int) int {
+	if in <= 0 {
+		return def
+	}
+	if in > 50 {
+		return 50
+	}
+	return in
+}