diff --git a/runtime/hsa-runtime/core/runtime/runtime.cpp b/runtime/hsa-runtime/core/runtime/runtime.cpp
index 9fce3dee69..6e3cc13839 100644
--- a/runtime/hsa-runtime/core/runtime/runtime.cpp
+++ b/runtime/hsa-runtime/core/runtime/runtime.cpp
@@ -47,6 +47,7 @@
 #include <cstring>
 #include <string>
 #include <vector>
+#include <list>
 
 #include "core/common/shared.h"
 #include "core/inc/hsa_ext_interface.h"
@@ -1493,53 +1494,118 @@ void Runtime::LoadTools() {
   typedef Agent* (*tool_wrap_t)(Agent*);
   typedef void (*tool_add_t)(Runtime*);
 
-  // Load tool libs
+  std::vector<const char*> failed;
+
+  //Get loaded libs and filter to tool libraries.
+  struct lib_t {
+    lib_t(os::LibHandle lib, uint32_t order, std::string name) : lib_(lib), order_(order), name_(name) {}
+    os::LibHandle lib_;
+    uint32_t order_;
+    std::string name_;
+  };
+
+  std::list<lib_t> sorted;
+  uint32_t env_count=0;
+
+  // Load env var tool lib names and determine ordering offset.
   std::string tool_names = flag_.tools_lib_names();
+  std::vector<std::string> names;
   if (tool_names != "") {
-    std::vector<std::string> names = parse_tool_names(tool_names);
-    std::vector<const char*> failed;
-    for (auto& name : names) {
-      os::LibHandle tool = os::LoadLib(name);
+    names = parse_tool_names(tool_names);
+    env_count = names.size();
+  }
 
-      if (tool != NULL) {
-        tool_libs_.push_back(tool);
+  // Discover loaded tools.
+  std::vector<os::LibHandle> loaded = os::GetLoadedLibs();
+  for(auto& handle : loaded) {
+    const uint32_t* order = (const uint32_t*)os::GetExportAddress(handle, "HSA_AMD_TOOL_PRIORITY");
+    if(order) {
+      sorted.push_back(lib_t(handle, *order+env_count, os::GetLibraryName(handle)));
+    } else {
+      os::CloseLib(handle);
+    }
+  }
+  
+  // Load env var tools.
+  env_count=0;
+  for (auto& name : names) {
+    os::LibHandle tool = os::LoadLib(name);
 
-        rocr::AMD::callback_t<tool_init_t> ld = (tool_init_t)os::GetExportAddress(tool, "OnLoad");
-        if (ld) {
-          if (!ld(&hsa_api_table_.hsa_api,
-                  hsa_api_table_.hsa_api.version.major_id,
-                  failed.size(), &failed[0])) {
-            failed.push_back(name.c_str());
-            os::CloseLib(tool);
-            continue;
-          }
-        }
+    if (tool != nullptr) {
+      sorted.push_back(lib_t(tool, env_count, name));
+      env_count++;
+    } else {
+      failed.push_back(name.c_str());
+      if (flag().report_tool_load_failures())
+        fprintf(stderr, "Tool lib \"%s\" failed to load.\n", name.c_str());
+    }
+  }
 
-        rocr::AMD::callback_t<tool_wrap_t> wrap =
-            (tool_wrap_t)os::GetExportAddress(tool, "WrapAgent");
-        if (wrap) {
-          std::vector<core::Agent*>* agent_lists[2] = {&cpu_agents_,
-                                                       &gpu_agents_};
-          for (std::vector<core::Agent*>* agent_list : agent_lists) {
-            for (size_t agent_idx = 0; agent_idx < agent_list->size();
-                 ++agent_idx) {
+  if(!sorted.empty()) {
+    // Close duplicate handles
+    sorted.sort([](const lib_t& lhs, const lib_t& rhs) {
+      if(lhs.lib_ == rhs.lib_)
+        return lhs.order_ < rhs.order_;
+      return lhs.lib_ < rhs.lib_;
+    });
+
+    os::LibHandle current = sorted.front().lib_;
+    auto it = sorted.begin();
+    it++;
+    while(it != sorted.end()) {
+      if(it->lib_==current) {
+        os::CloseLib(current);
+        auto rem = it;
+        it = sorted.erase(rem);
+      } else {
+        current = it->lib_;
+        it++;
+      }
+    }
+
+    // Sort to load order
+    sorted.sort([](const lib_t& lhs, const lib_t& rhs) {
+      return lhs.order_ < rhs.order_;
+    });
+    
+    for(auto& lib : sorted) {
+      auto& tool = lib.lib_;
+
+      rocr::AMD::callback_t<tool_init_t> ld = (tool_init_t)os::GetExportAddress(tool, "OnLoad");
+      if (!ld) {
+        failed.push_back(lib.name_.c_str());
+        os::CloseLib(tool);
+        continue;
+      }
+      if (!ld(&hsa_api_table_.hsa_api,
+        hsa_api_table_.hsa_api.version.major_id,
+        failed.size(), &failed[0])) {
+          failed.push_back(lib.name_.c_str());
+          os::CloseLib(tool);
+          continue;
+      }
+      tool_libs_.push_back(tool);
+
+      rocr::AMD::callback_t<tool_wrap_t> wrap =
+        (tool_wrap_t)os::GetExportAddress(tool, "WrapAgent");
+      if (wrap) {
+        std::vector<core::Agent*>* agent_lists[2] = {&cpu_agents_,
+          &gpu_agents_};
+        for (std::vector<core::Agent*>* agent_list : agent_lists) {
+          for (size_t agent_idx = 0; agent_idx < agent_list->size();
+            ++agent_idx) {
               Agent* agent = wrap(agent_list->at(agent_idx));
               if (agent != NULL) {
                 assert(agent->IsValid() &&
-                       "Agent returned from WrapAgent is not valid");
+                  "Agent returned from WrapAgent is not valid");
                 agent_list->at(agent_idx) = agent;
               }
-            }
           }
         }
+      }
 
-        rocr::AMD::callback_t<tool_add_t> add = (tool_add_t)os::GetExportAddress(tool, "AddAgent");
-        if (add) add(this);
-      }
-      else {
-        if (flag().report_tool_load_failures())
-          fprintf(stderr, "Tool lib \"%s\" failed to load.\n", name.c_str());
-      }
+      rocr::AMD::callback_t<tool_add_t> add = (tool_add_t)os::GetExportAddress(tool, "AddAgent");
+      if (add) add(this);
     }
   }
 }
diff --git a/runtime/hsa-runtime/core/util/lnx/os_linux.cpp b/runtime/hsa-runtime/core/util/lnx/os_linux.cpp
index 6b48fd39fb..14cbdea69e 100644
--- a/runtime/hsa-runtime/core/util/lnx/os_linux.cpp
+++ b/runtime/hsa-runtime/core/util/lnx/os_linux.cpp
@@ -200,6 +200,35 @@ void* GetExportAddress(LibHandle lib, std::string export_name) {
 
 void CloseLib(LibHandle lib) { dlclose(*(void**)&lib); }
 
+std::vector<LibHandle> GetLoadedLibs() {
+
+  std::vector<LibHandle> ret;
+  std::vector<std::string> names;
+  auto callback = [&](dl_phdr_info* info) {
+    if(info->dlpi_name[0] != '\0')
+      names.push_back(info->dlpi_name);
+  };
+  typedef decltype(callback) call_t;
+
+  dl_iterate_phdr([](dl_phdr_info* info, size_t size, void* data){
+    auto& call = *(call_t*)data;
+    call(info);
+    return 0;
+  }, &callback);
+
+  for(auto& name : names)
+    ret.push_back(LoadLib(name));
+
+  return ret;
+}
+
+std::string GetLibraryName(LibHandle lib) {
+  link_map *map;
+  if(dlinfo(lib, RTLD_DI_LINKMAP, &map)!=0)
+    return "";
+  return map->l_name;
+}
+
 Mutex CreateMutex() {
   pthread_mutex_t* mutex = new pthread_mutex_t;
   pthread_mutex_init(mutex, NULL);
diff --git a/runtime/hsa-runtime/core/util/os.h b/runtime/hsa-runtime/core/util/os.h
index 21f6687ffa..aa0c8d565f 100644
--- a/runtime/hsa-runtime/core/util/os.h
+++ b/runtime/hsa-runtime/core/util/os.h
@@ -46,6 +46,7 @@
 #define HSA_RUNTIME_CORE_UTIL_OS_H_
 
 #include <string>
+#include <vector>
 #include "utils.h"
 
 namespace rocr {
@@ -85,6 +86,15 @@ void* GetExportAddress(LibHandle lib, std::string export_name);
 /// @param: lib(Input), library handle which will be unloaded.
 void CloseLib(LibHandle lib);
 
+/// @brief: Lists libraries in the process
+/// @return: List of library handles
+std::vector<LibHandle> GetLoadedLibs();
+
+/// @brief: Returns the library's path name.
+/// @param: lib(Input), libray handle
+/// @return: Path name of library
+std::string GetLibraryName(LibHandle lib);
+
 /// @brief: Creates a mutex, will return NULL if failed.
 /// @param: void.
 /// @return: Mutex.
diff --git a/runtime/hsa-runtime/core/util/win/os_win.cpp b/runtime/hsa-runtime/core/util/win/os_win.cpp
index f42f05fc85..f5fb05840c 100644
--- a/runtime/hsa-runtime/core/util/win/os_win.cpp
+++ b/runtime/hsa-runtime/core/util/win/os_win.cpp
@@ -82,6 +82,15 @@ void* GetExportAddress(LibHandle lib, std::string export_name) {
 
 void CloseLib(LibHandle lib) { FreeLibrary(*(::HMODULE*)&lib); }
 
+std::vector<LibHandle> GetLoadedLibs() {
+  // Use EnumProcessModulesEx
+  static_assert(false, "Not implemented.");
+}
+
+std::string GetLibraryName(LibHandle lib) {
+  static_assert(false, "Not implemented.");
+}
+
 Mutex CreateMutex() { return CreateEvent(NULL, false, true, NULL); }
 
 bool TryAcquireMutex(Mutex lock) {