diff --git a/lua/avante/providers/copilot.lua b/lua/avante/providers/copilot.lua
index bfdbeb6..47305ff 100644
--- a/lua/avante/providers/copilot.lua
+++ b/lua/avante/providers/copilot.lua
@@ -31,7 +31,7 @@ local Config = require("avante.config")
 local Path = require("plenary.path")
 local Utils = require("avante.utils")
 local P = require("avante.providers")
-local O = require("avante.providers").openai
+local OpenAI = require("avante.providers").openai
 
 local H = {}
 
@@ -215,10 +215,31 @@ M.parse_messages = function(opts)
   vim
     .iter(opts.messages)
     :each(function(msg) table.insert(messages, { role = M.role_map[msg.role], content = msg.content }) end)
+  if opts.tool_result then
+    table.insert(messages, {
+      role = M.role_map["assistant"],
+      tool_calls = {
+        {
+          id = opts.tool_use.id,
+          type = "function",
+          ["function"] = {
+            name = opts.tool_use.name,
+            arguments = opts.tool_use.input_json,
+          },
+        },
+      },
+    })
+    local result_content = opts.tool_result.content or ""
+    table.insert(messages, {
+      role = "tool",
+      tool_call_id = opts.tool_result.tool_use_id,
+      content = opts.tool_result.is_error and "Error: " .. result_content or result_content,
+    })
+  end
   return messages
 end
 
-M.parse_response = O.parse_response
+M.parse_response = OpenAI.parse_response
 
 M.parse_curl_args = function(provider, code_opts)
   -- refresh token synchronously, only if it has expired
@@ -227,6 +248,13 @@ M.parse_curl_args = function(provider, code_opts)
 
   local base, body_opts = P.parse_config(provider)
 
+  local tools = {}
+  if code_opts.tools then
+    for _, tool in ipairs(code_opts.tools) do
+      table.insert(tools, OpenAI.transform_tool(tool))
+    end
+  end
+
   return {
     url = H.chat_completion_url(base.endpoint),
     timeout = base.timeout,
@@ -242,6 +270,7 @@ M.parse_curl_args = function(provider, code_opts)
       model = base.model,
       messages = M.parse_messages(code_opts),
       stream = true,
+      tools = tools,
     }, body_opts),
   }
 end
diff --git a/lua/avante/providers/openai.lua b/lua/avante/providers/openai.lua
index 54ab509..1ff6cf8 100644
--- a/lua/avante/providers/openai.lua
+++ b/lua/avante/providers/openai.lua
@@ -60,9 +60,19 @@ local P = require("avante.providers")
 ---@field type string
 ---@field description string
 
+---@class AvanteProviderFunctor
+local M = {}
+
+M.api_key_name = "OPENAI_API_KEY"
+
+M.role_map = {
+  user = "user",
+  assistant = "assistant",
+}
+
 ---@param tool AvanteLLMTool
 ---@return AvanteOpenAITool
-local function transform_tool(tool)
+function M.transform_tool(tool)
   local input_schema_properties = {}
   local required = {}
   for _, field in ipairs(tool.param.fields) do
@@ -90,16 +100,6 @@ local function transform_tool(tool)
   return res
 end
 
----@class AvanteProviderFunctor
-local M = {}
-
-M.api_key_name = "OPENAI_API_KEY"
-
-M.role_map = {
-  user = "user",
-  assistant = "assistant",
-}
-
 M.is_openrouter = function(url) return url:match("^https://openrouter%.ai/") end
 
 ---@param opts AvantePromptOptions
@@ -301,7 +301,7 @@ M.parse_curl_args = function(provider, code_opts)
   local tools = {}
   if code_opts.tools then
     for _, tool in ipairs(code_opts.tools) do
-      table.insert(tools, transform_tool(tool))
+      table.insert(tools, M.transform_tool(tool))
     end
   end