diff --git a/lua/avante/config.lua b/lua/avante/config.lua
index 1ab6529..7113632 100644
--- a/lua/avante/config.lua
+++ b/lua/avante/config.lua
@@ -17,6 +17,7 @@ local Utils = require("avante.utils")
 ---@class avante.CoreConfig: avante.Config
 local M = {}
 ---@class avante.Config
+---@field custom_tools AvanteLLMToolPublic[]
 M._defaults = {
   debug = false,
   ---@alias Provider "claude" | "openai" | "azure" | "gemini" | "vertex" | "cohere" | "copilot" | string
@@ -409,6 +410,8 @@ M._defaults = {
     throttle = 600,
   },
   disabled_tools = {}, ---@type string[]
+  ---@type AvanteLLMToolPublic[]
+  custom_tools = {},
 }
 
 ---@type avante.Config
diff --git a/lua/avante/llm_tools.lua b/lua/avante/llm_tools.lua
index 635de4d..9458396 100644
--- a/lua/avante/llm_tools.lua
+++ b/lua/avante/llm_tools.lua
@@ -573,8 +573,10 @@ end
 
 ---@return AvanteLLMTool[]
 function M.get_tools()
+  ---@type AvanteLLMTool[]
+  local unfiltered_tools = vim.list_extend(vim.list_extend({}, M._tools), Config.custom_tools)
   return vim
-    .iter(M._tools)
+    .iter(unfiltered_tools)
     :filter(function(tool) ---@param tool AvanteLLMTool
       -- Always disable tools that are explicitly disabled
       if vim.tbl_contains(Config.disabled_tools, tool.name) then return false end
diff --git a/lua/avante/types.lua b/lua/avante/types.lua
index fc214b4..a44eda1 100644
--- a/lua/avante/types.lua
+++ b/lua/avante/types.lua
@@ -328,18 +328,21 @@ vim.g.avante_login = vim.g.avante_login
 ---@field returns AvanteLLMToolReturn[]
 ---@field enabled? fun(): boolean
 
+---@class AvanteLLMToolPublic : AvanteLLMTool
+---@field func AvanteLLMToolFunc
+
 ---@class AvanteLLMToolParam
----@field type string
+---@field type 'table'
 ---@field fields AvanteLLMToolParamField[]
 
 ---@class AvanteLLMToolParamField
 ---@field name string
 ---@field description string
----@field type string
+---@field type 'string' | 'integer'
 ---@field optional? boolean
 
 ---@class AvanteLLMToolReturn
 ---@field name string
 ---@field description string
----@field type string
+---@field type 'string' | 'string[]' | 'boolean'
 ---@field optional? boolean