diff --git a/src/goldfish.hpp b/src/goldfish.hpp
index dd739ab25..c4a61b4bd 100644
--- a/src/goldfish.hpp
+++ b/src/goldfish.hpp
@@ -3940,21 +3940,67 @@ find_gfproject_json (const char* gf_lib) {
 
 static json
 load_gfproject_config (const char* gf_lib) {
-  fs::path config_path= find_gfproject_json (gf_lib);
-  if (config_path.empty ()) {
+  // Find both gfproject.json files if they exist
+  std::error_code ec;
+  fs::path cwd= fs::current_path (ec);
+  fs::path local_path= cwd / "gfproject.json";
+  bool local_exists= !ec && fs::exists (local_path, ec) && fs::is_regular_file (local_path, ec);
+
+  fs::path lib_path= fs::path (gf_lib) / "gfproject.json";
+  bool lib_exists= fs::exists (lib_path, ec) && fs::is_regular_file (lib_path, ec);
+
+  // If neither exists, return empty object
+  if (!local_exists && !lib_exists) {
     return json::object ();
   }
-  try {
-    std::ifstream file (config_path);
-    if (!file.is_open ()) {
-      return json::object ();
-    }
-    json config;
-    file >> config;
-    return config;
-  } catch (...) {
-    return json::object ();
+
+  // Start with lib config as base (only tools section will be merged)
+  json merged= json::object ();
+  json lib_tools= json::object ();
+  if (lib_exists) {
+    try {
+      std::ifstream lib_file (lib_path);
+      if (lib_file.is_open ()) {
+        json lib_config;
+        lib_file >> lib_config;
+        if (lib_config.contains ("tools")) {
+          lib_tools= lib_config["tools"];
+        }
+      }
+    } catch (...) {
+      // Ignore parse errors for lib config
+    }
+  }
+
+  // Get local tools (local takes precedence)
+  json local_tools= json::object ();
+  if (local_exists) {
+    try {
+      std::ifstream local_file (local_path);
+      if (local_file.is_open ()) {
+        json local_config;
+        local_file >> local_config;
+        if (local_config.contains ("tools")) {
+          local_tools= local_config["tools"];
+        }
+      }
+    } catch (...) {
+      // Ignore parse errors for local config
+    }
+  }
+
+  // Merge tools: lib as base, local overrides (except "help" which is always internal)
+  json merged_tools= lib_tools;
+  for (auto& [key, value] : local_tools.items ()) {
+    // "help" tool is never merged - always use internal implementation
+    if (key == "help") {
+      continue;
+    }
+    merged_tools[key]= value;
   }
+  merged["tools"]= merged_tools;
+
+  return merged;
 }
 
 static string
@@ -3989,13 +4035,9 @@ goldfish_run_tool (s7_scheme* sc, const char* gf_lib, const string& command,
   json tool_config= config["tools"][command];
 
   // Check if tool has implementation (organization and module)
+  // If not complete, fall back to internal implementation (return -1)
   if (!tool_config.contains ("organization") || !tool_config.contains ("module")) {
-    cerr << "Error: Tool '" << command << "' is not fully implemented (missing organization or module)."
-         << endl;
-    s7_close_output_port (sc, s7_current_error_port (sc));
-    s7_set_current_error_port (sc, old_port);
-    if (gc_loc != -1) s7_gc_unprotect_at (sc, gc_loc);
-    return 1;
+    return -1; // Fall back to internal implementation
   }
 
   string org     = tool_config["organization"];
@@ -4003,11 +4045,7 @@ goldfish_run_tool (s7_scheme* sc, const char* gf_lib, const string& command,
   string tool_root= find_tool_root_by_command (gf_lib, command);
 
   if (tool_root.empty ()) {
-    cerr << "Error: tools/" << command << "/" << org << " directory not found." << endl;
-    s7_close_output_port (sc, s7_current_error_port (sc));
-    s7_set_current_error_port (sc, old_port);
-    if (gc_loc != -1) s7_gc_unprotect_at (sc, gc_loc);
-    return 1;
+    return -1; // Fall back to internal implementation
   }
 
   s7_add_to_load_path (sc, tool_root.c_str ());
@@ -5315,8 +5353,9 @@ repl_for_community_edition (s7_scheme* sc, int argc, char** argv) {
   }
 
   // 处理动态注册的工具（从 gfproject.json 加载）
+  // 注意："help" 命令始终使用内部实现，不从 gfproject.json 加载
   json gfproject_config = load_gfproject_config (gf_lib);
-  if (gfproject_config.contains ("tools") && gfproject_config["tools"].contains (command)) {
+  if (command != "help" && gfproject_config.contains ("tools") && gfproject_config["tools"].contains (command)) {
     int tool_ret = goldfish_run_tool (sc, gf_lib, command, errmsg, old_port, gc_loc);
     if (tool_ret != -1) {
       // Tool was found and executed (or failed with an error)
@@ -5325,6 +5364,15 @@ repl_for_community_edition (s7_scheme* sc, int argc, char** argv) {
     // If tool_ret == -1, tool config exists but execution failed, fall through to check other commands
   }
 
+  // 处理 help 命令（始终使用内部实现）
+  if (command == "help") {
+    display_help ();
+    s7_close_output_port (sc, s7_current_error_port (sc));
+    s7_set_current_error_port (sc, old_port);
+    if (gc_loc != -1) s7_gc_unprotect_at (sc, gc_loc);
+    return 0;
+  }
+
   // 处理 eval 子命令
   if (command == "eval") {
     if (argc < command_index + 1) {
diff --git a/tools/help/liii/goldhelp.scm b/tools/help/liii/goldhelp.scm
index a791c0358..2df9ceaed 100644
--- a/tools/help/liii/goldhelp.scm
+++ b/tools/help/liii/goldhelp.scm
@@ -35,23 +35,79 @@
   ) ;export
   (begin
 
-    (define (find-gfproject-path)
-      "Search for gfproject.json in current directory"
+    (define (find-gfproject-path kind)
+      "Search for gfproject.json - 'local or 'lib"
       (let ((cwd (getcwd)))
-        (if cwd
-            (let ((test-path (path->string (path-join (path cwd) (path "gfproject.json")))))
-              (if (file-exists? test-path)
-                  test-path
-                  #f))
-            #f)))
+        (cond
+         ((eq? kind 'local)
+          (if cwd
+              (let ((test-path (path->string (path-join (path cwd) (path "gfproject.json")))))
+                (if (file-exists? test-path)
+                    test-path
+                    #f))
+              #f))
+         ((eq? kind 'lib)
+          ;; First try GF_LIB environment variable
+          (let ((gf-lib (getenv "GF_LIB")))
+            (if gf-lib
+                (let ((lib-path (path->string (path-join (path gf-lib) (path "gfproject.json")))))
+                  (if (file-exists? lib-path)
+                      lib-path
+                      #f))
+                ;; Fallback: search from executable location upward
+                (let ((exe-path (executable)))
+                  (if exe-path
+                      (let search ((dir (path-dirname (path exe-path))))
+                        (if dir
+                            (let ((gfproject-path (path->string (path-join dir (path "gfproject.json")))))
+                              (if (file-exists? gfproject-path)
+                                  gfproject-path
+                                  (search (path-dirname dir))))
+                            #f))
+                      #f)))))
+         (else #f))))
+
+    (define (json-merge-tools lib-tools local-tools)
+      "Merge two tools JSON objects, local takes precedence (except 'help')"
+      (cond
+       ((json-null? lib-tools)
+        (if (json-null? local-tools)
+            (make-json)
+            local-tools))
+       ((json-null? local-tools)
+        lib-tools)
+       (else
+        ;; Start with lib tools as base, then add local tools (except "help")
+        (let ((merged (make-json)))
+          ;; Add lib tools (except "help")
+          (for-each
+           (lambda (key)
+             (when (not (string=? key "help"))
+               (json-set! merged key (json-ref lib-tools key))))
+           (json-keys lib-tools))
+          ;; Add local tools (except "help"), overwriting lib values
+          (for-each
+           (lambda (key)
+             (when (not (string=? key "help"))
+               (json-set! merged key (json-ref local-tools key))))
+           (json-keys local-tools))
+          merged)))))
 
     (define (load-gfproject)
-      "Load and parse gfproject.json, return tools object"
-      (let ((path (find-gfproject-path)))
-        (if path
-            (let ((content (path-read-text path)))
-              (string->json content))
-            (string->json "{}"))))
+      "Load and merge gfproject.json from local and lib, local takes precedence"
+      (let ((local-path (find-gfproject-path 'local))
+            (lib-path (find-gfproject-path 'lib)))
+        (let ((lib-config (if lib-path
+                              (let ((content (path-read-text lib-path)))
+                                (string->json content))
+                              (make-json)))
+              (local-config (if local-path
+                                (let ((content (path-read-text local-path)))
+                                  (string->json content))
+                                (make-json))))
+          (let ((lib-tools (json-ref lib-config "tools"))
+                (local-tools (json-ref local-config "tools")))
+            (json-merge-tools lib-tools local-tools)))))
 
     (define (get-tool-description tools tool-name lang)
       "Get description for a tool in specified language"