feat: add working indicator and get_current_time to system prompt

Send "mimi😗is working..." to user when processing starts.
List get_current_time in system prompt available tools so the agent
knows to call it for time/date queries. Remove auto time fetch from
system prompt builder — agent calls the tool on demand.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -149,6 +149,7 @@ MimiClaw uses Anthropic's tool use protocol — Claude can call tools during a c
 | Tool | Description |
 |------|-------------|
 | `web_search` | Search the web via Brave Search API for current information |
+| `get_current_time` | Fetch current date/time via HTTP and set the system clock |
 
 To enable web search, set a [Brave Search API key](https://brave.com/search/api/) in your config file or via CLI (`set_search_key`).
 

README_CN.md

@@ -171,6 +171,7 @@ MimiClaw 使用 Anthropic 的 tool use 协议 — Claude 在对话中可以调
 | 工具 | 说明 |
 |------|------|
 | `web_search` | 通过 Brave Search API 搜索网页，获取实时信息 |
+| `get_current_time` | 通过 HTTP 获取当前日期和时间，并设置系统时钟 |
 
 启用网页搜索需要设置 [Brave Search API key](https://brave.com/search/api/)，在配置文件或 CLI（`set_search_key`）中设置。
 

main/agent/agent_loop.c

@@ -100,6 +100,15 @@ static void agent_loop_task(void *arg)
 
         ESP_LOGI(TAG, "Processing message from %s:%s", msg.channel, msg.chat_id);
 
+        /* Send "working" indicator */
+        {
+            mimi_msg_t status = {0};
+            strncpy(status.channel, msg.channel, sizeof(status.channel) - 1);
+            strncpy(status.chat_id, msg.chat_id, sizeof(status.chat_id) - 1);
+            status.content = strdup("mimi\xF0\x9F\x98\x97is working...");
+            if (status.content) message_bus_push_outbound(&status);
+        }
+
         /* 1. Build system prompt */
         context_build_system_prompt(system_prompt, MIMI_CONTEXT_BUF_SIZE);
 

main/agent/context_builder.c

@@ -4,7 +4,6 @@
 
 #include <stdio.h>
 #include <string.h>
-#include <time.h>
 #include "esp_log.h"
 #include "cJSON.h"
 
@@ -30,26 +29,18 @@ esp_err_t context_build_system_prompt(char *buf, size_t size)
 {
     size_t off = 0;
 
-    /* Identity header */
-    time_t now;
-    time(&now);
-    struct tm tm;
-    localtime_r(&now, &tm);
-    char time_str[64];
-    strftime(time_str, sizeof(time_str), "%Y-%m-%d %H:%M (%A)", &tm);
-
     off += snprintf(buf + off, size - off,
         "# MimiClaw\n\n"
         "You are MimiClaw, a personal AI assistant running on an ESP32-S3 device.\n"
         "You communicate through Telegram and WebSocket.\n\n"
-        "## Current Time\n%s\n\n"
         "Be helpful, accurate, and concise.\n\n"
         "## Available Tools\n"
         "You have access to the following tools:\n"
         "- web_search: Search the web for current information. "
-        "Use this when you need up-to-date facts, news, weather, or anything beyond your training data.\n\n"
-        "Use tools when needed. Provide your final answer as text after using tools.\n",
-        time_str);
+        "Use this when you need up-to-date facts, news, weather, or anything beyond your training data.\n"
+        "- get_current_time: Get the current date and time. "
+        "You do NOT have an internal clock — always use this tool when you need to know the time or date.\n\n"
+        "Use tools when needed. Provide your final answer as text after using tools.\n");
 
     /* Bootstrap files */
     off = append_file(buf, size, off, MIMI_SOUL_FILE, "Personality");