fix: ReAct tool use format in few-shot (#2542)

crates/avante-templates/src/lib.rs

@@ -45,6 +45,7 @@ struct TemplateContext {
     memory: Option<String>,
     todos: Option<String>,
     enable_fastapply: Option<bool>,
+    use_react_prompt: Option<bool>,
 }
 
 // Given the file name registered after add, the context table in Lua, resulted in a formatted
@@ -74,6 +75,7 @@ fn render(state: &State, template: &str, context: TemplateContext) -> LuaResult<
                   memory => context.memory,
                   todos => context.todos,
                   enable_fastapply => context.enable_fastapply,
+                  use_react_prompt => context.use_react_prompt,
                 })
                 .map_err(LuaError::external)
                 .unwrap())

lua/avante/llm.lua

@@ -296,6 +296,8 @@ function M.generate_prompts(opts)
 
   selected_files = vim.iter(selected_files):filter(function(file) return viewed_files[file.path] == nil end):totable()
 
+  local provider_conf = Providers.parse_config(provider)
+
   local template_opts = {
     ask = opts.ask, -- TODO: add mode without ask instruction
     code_lang = opts.code_lang,
@@ -308,6 +310,7 @@ function M.generate_prompts(opts)
     model_name = provider.model or "unknown",
     memory = opts.memory,
     enable_fastapply = Config.behaviour.enable_fastapply,
+    use_react_prompt = provider_conf.use_ReAct_prompt,
   }
 
   -- Removed the original todos processing logic, now handled in context_messages

lua/avante/templates/_tools-guidelines.avanterules

@@ -34,6 +34,9 @@ TOOLS USAGE GUIDE
 **Crucial Example of Correct Behavior:**
 *   **User Input:** "Hi there"
 *   **Your REQUIRED Output (as a tool call):**
+    {% if use_react_prompt -%}
+    <tool_use>{"name": "attempt_completion", "input": {"result": "[**Generated Response Following the Greeting Response Guideline**]"}}</tool_use>
+    {% else -%}
     ```json
     {
       "tool_calls": [
@@ -47,3 +50,4 @@ TOOLS USAGE GUIDE
       ]
     }
     ```
+    {% endif %}