diff --git a/tooling/files.sh b/tooling/files.sh
index 582afe4d..4a0ec799 100644
--- a/tooling/files.sh
+++ b/tooling/files.sh
@@ -18,3 +18,4 @@ done
 
 $tool @$file_list -v --log-file=log-functions.txt
 $tool tmps/gh_global.h -mglobals -v --log-file=log-globals.txt
+$tool -mduplicates -v --log-file=log-duplicates.txt
diff --git a/tooling/tool.cpp b/tooling/tool.cpp
index a6378546..a68c667d 100644
--- a/tooling/tool.cpp
+++ b/tooling/tool.cpp
@@ -192,6 +192,126 @@ public:
   void rollbackTransaction() {
     sqlite3_exec(db, "ROLLBACK", nullptr, nullptr, nullptr);
   }
+
+  // New methods for duplicate checking
+  bool checkDuplicateAddresses() {
+    const char *sql = R"(
+      WITH all_addresses AS (
+        SELECT 'Functions' as table_name, name, address, filepath FROM Functions WHERE address != ''
+        UNION ALL
+        SELECT 'Imports' as table_name, name, address, filepath FROM Imports WHERE address != ''
+        UNION ALL
+        SELECT 'Globals' as table_name, name, address, filepath FROM Globals WHERE address != ''
+      )
+      SELECT address, COUNT(*) as count,
+             GROUP_CONCAT(table_name || ':' || name || ' (' || filepath || ')', '; ') as entries
+      FROM all_addresses
+      GROUP BY address
+      HAVING COUNT(*) > 1
+      ORDER BY address;
+    )";
+
+    sqlite3_stmt *stmt;
+    if (sqlite3_prepare_v2(db, sql, -1, &stmt, nullptr) != SQLITE_OK) {
+      spdlog::error("Failed to prepare duplicate address query: {}",
+                    sqlite3_errmsg(db));
+      return false;
+    }
+
+    bool found_duplicates = false;
+    while (sqlite3_step(stmt) == SQLITE_ROW) {
+      found_duplicates = true;
+      const char *address = (const char *)sqlite3_column_text(stmt, 0);
+      int count = sqlite3_column_int(stmt, 1);
+      const char *entries = (const char *)sqlite3_column_text(stmt, 2);
+
+      spdlog::error("DUPLICATE ADDRESS: {} appears {} times in: {}", address,
+                    count, entries);
+    }
+
+    sqlite3_finalize(stmt);
+    return found_duplicates;
+  }
+
+  bool checkDuplicateNames() {
+    bool found_duplicates = false;
+
+    // Check Functions table
+    const char *functions_sql = R"(
+      SELECT name, COUNT(*) as count,
+             GROUP_CONCAT(filepath, '; ') as filepaths
+      FROM Functions
+      GROUP BY name
+      HAVING COUNT(*) > 1
+      ORDER BY name;
+    )";
+
+    sqlite3_stmt *stmt;
+    if (sqlite3_prepare_v2(db, functions_sql, -1, &stmt, nullptr) ==
+        SQLITE_OK) {
+      while (sqlite3_step(stmt) == SQLITE_ROW) {
+        found_duplicates = true;
+        const char *name = (const char *)sqlite3_column_text(stmt, 0);
+        int count = sqlite3_column_int(stmt, 1);
+        const char *filepaths = (const char *)sqlite3_column_text(stmt, 2);
+
+        spdlog::error(
+            "DUPLICATE FUNCTION NAME: '{}' appears {} times in files: {}", name,
+            count, filepaths);
+      }
+      sqlite3_finalize(stmt);
+    }
+
+    // Check Imports table
+    const char *imports_sql = R"(
+      SELECT name, COUNT(*) as count,
+             GROUP_CONCAT(filepath, '; ') as filepaths
+      FROM Imports
+      GROUP BY name
+      HAVING COUNT(*) > 1
+      ORDER BY name;
+    )";
+
+    if (sqlite3_prepare_v2(db, imports_sql, -1, &stmt, nullptr) == SQLITE_OK) {
+      while (sqlite3_step(stmt) == SQLITE_ROW) {
+        found_duplicates = true;
+        const char *name = (const char *)sqlite3_column_text(stmt, 0);
+        int count = sqlite3_column_int(stmt, 1);
+        const char *filepaths = (const char *)sqlite3_column_text(stmt, 2);
+
+        spdlog::error(
+            "DUPLICATE IMPORT NAME: '{}' appears {} times in files: {}", name,
+            count, filepaths);
+      }
+      sqlite3_finalize(stmt);
+    }
+
+    // Check Globals table
+    const char *globals_sql = R"(
+      SELECT name, COUNT(*) as count,
+             GROUP_CONCAT(filepath, '; ') as filepaths
+      FROM Globals
+      GROUP BY name
+      HAVING COUNT(*) > 1
+      ORDER BY name;
+    )";
+
+    if (sqlite3_prepare_v2(db, globals_sql, -1, &stmt, nullptr) == SQLITE_OK) {
+      while (sqlite3_step(stmt) == SQLITE_ROW) {
+        found_duplicates = true;
+        const char *name = (const char *)sqlite3_column_text(stmt, 0);
+        int count = sqlite3_column_int(stmt, 1);
+        const char *filepaths = (const char *)sqlite3_column_text(stmt, 2);
+
+        spdlog::error(
+            "DUPLICATE GLOBAL NAME: '{}' appears {} times in files: {}", name,
+            count, filepaths);
+      }
+      sqlite3_finalize(stmt);
+    }
+
+    return found_duplicates;
+  }
 };
 
 std::string extractAddress(const std::string &comment) {
@@ -611,6 +731,29 @@ bool dumpTreeFile(const std::string &filepath) {
   return true;
 }
 
+bool processDuplicates(DatabaseManager &db) {
+  spdlog::info("=== Checking for duplicate addresses ===");
+  bool found_address_duplicates = db.checkDuplicateAddresses();
+
+  spdlog::info("=== Checking for duplicate names ===");
+  bool found_name_duplicates = db.checkDuplicateNames();
+
+  if (!found_address_duplicates && !found_name_duplicates) {
+    spdlog::info("No duplicates found in the database.");
+    return true;
+  }
+
+  if (found_address_duplicates) {
+    spdlog::error("Found duplicate addresses in the database!");
+  }
+
+  if (found_name_duplicates) {
+    spdlog::error("Found duplicate names in the database!");
+  }
+
+  return false; // Return false to indicate errors were found
+}
+
 int main(int argc, char *argv[]) {
   // Initialize spdlog
   auto console = spdlog::stdout_color_mt("console");
@@ -634,9 +777,12 @@ int main(int argc, char *argv[]) {
                  "File containing list of files to process");
   app.add_option("-d,--database", db_path, "SQLite database path")
       ->default_val("gh.db");
-  app.add_option("-m,--mode", mode, "Processing mode: 'functions', 'globals', or 'dump-tree'")
+  app.add_option("-m,--mode", mode,
+                 "Processing mode: 'functions', 'globals', 'duplicates', or "
+                 "'dump-tree'")
       ->default_val("functions")
-      ->check(CLI::IsMember({"functions", "globals", "dump-tree"}));
+      ->check(
+          CLI::IsMember({"functions", "globals", "duplicates", "dump-tree"}));
   app.add_flag("-v,--verbose", verbose, "Enable verbose logging (debug level)");
   app.add_flag("--log-file", log_file, "Enable logging to file");
 
@@ -647,6 +793,8 @@ int main(int argc, char *argv[]) {
     spdlog::set_level(spdlog::level::debug);
   }
 
+  spdlog::set_pattern(std::string("[%^%l%$] %v"));
+
   if (!log_file.empty()) {
     auto log_sink =
         std::make_shared<spdlog::sinks::basic_file_sink_mt>(log_file, true);
@@ -654,28 +802,31 @@ int main(int argc, char *argv[]) {
   }
 
   std::vector<std::string> files_to_process;
+  bool needFiles = mode != "duplicates";
 
-  if (!list_file.empty()) {
-    auto list_files = readFileList(list_file);
-    files_to_process.insert(files_to_process.end(), list_files.begin(),
-                            list_files.end());
-  }
-
-  for (const auto &input : input_files) {
-    if (input.starts_with("@")) {
-      auto list_files = readFileList(input.substr(1));
+  if (needFiles) {
+    if (!list_file.empty()) {
+      auto list_files = readFileList(list_file);
       files_to_process.insert(files_to_process.end(), list_files.begin(),
                               list_files.end());
-    } else if (std::filesystem::exists(input)) {
-      files_to_process.push_back(input);
-    } else {
-      spdlog::warn("File not found: {}", input);
     }
-  }
 
-  if (files_to_process.empty()) {
-    spdlog::error("No files to process. Use --help for usage information.");
-    return 1;
+    for (const auto &input : input_files) {
+      if (input.starts_with("@")) {
+        auto list_files = readFileList(input.substr(1));
+        files_to_process.insert(files_to_process.end(), list_files.begin(),
+                                list_files.end());
+      } else if (std::filesystem::exists(input)) {
+        files_to_process.push_back(input);
+      } else {
+        spdlog::warn("File not found: {}", input);
+      }
+    }
+
+    if (files_to_process.empty()) {
+      spdlog::error("No files to process. Use --help for usage information.");
+      return 1;
+    }
   }
 
   try {
@@ -689,8 +840,18 @@ int main(int argc, char *argv[]) {
           processed_count++;
         }
       }
+    } else if (mode == "duplicates") {
+      DatabaseManager db(db_path);
+      // For duplicates mode, we only check the database, no file processing
+      spdlog::info("=== Checking database for duplicates ===");
+      bool has_duplicates = !processDuplicates(db);
+      spdlog::info("=== Summary ===");
+      spdlog::info("Mode: {}", mode);
+      spdlog::info("Database: {}", db_path);
+      return has_duplicates ? 1 : 0; // Return 1 if duplicates found, 0 if none
     } else {
       DatabaseManager db(db_path);
+
       const size_t batch_size = 50;
       size_t current_batch = 0;
 
@@ -710,7 +871,8 @@ int main(int argc, char *argv[]) {
 
         if (++current_batch >= batch_size) {
           db.commitTransaction();
-          spdlog::info("Committed batch of {} files to database", current_batch);
+          spdlog::info("Committed batch of {} files to database",
+                       current_batch);
           db.beginTransaction();
           current_batch = 0;
         }