diff --git a/main/CMakeLists.txt b/main/CMakeLists.txt
index 94875bc..c5e959f 100644
--- a/main/CMakeLists.txt
+++ b/main/CMakeLists.txt
@@ -3,7 +3,8 @@ idf_component_register(
         "mimi.c"
         "bus/message_bus.c"
         "wifi/wifi_manager.c"
-        "telegram/telegram_bot.c"
+        "channels/telegram/telegram_bot.c"
+        "channels/feishu/feishu_bot.c"
         "llm/llm_proxy.c"
         "agent/agent_loop.c"
         "agent/context_builder.c"
diff --git a/main/channels/feishu/feishu_bot.c b/main/channels/feishu/feishu_bot.c
new file mode 100644
index 0000000..5817e0d
--- /dev/null
+++ b/main/channels/feishu/feishu_bot.c
@@ -0,0 +1,657 @@
+#include "feishu_bot.h"
+#include "mimi_config.h"
+#include "bus/message_bus.h"
+#include "proxy/http_proxy.h"
+
+#include <string.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "esp_log.h"
+#include "esp_http_client.h"
+#include "esp_http_server.h"
+#include "esp_crt_bundle.h"
+#include "esp_timer.h"
+#include "nvs.h"
+#include "cJSON.h"
+
+static const char *TAG = "feishu";
+
+/* ── Feishu API endpoints ──────────────────────────────────── */
+#define FEISHU_API_BASE         "https://open.feishu.cn/open-apis"
+#define FEISHU_AUTH_URL         FEISHU_API_BASE "/auth/v3/tenant_access_token/internal"
+#define FEISHU_SEND_MSG_URL     FEISHU_API_BASE "/im/v1/messages"
+#define FEISHU_REPLY_MSG_URL    FEISHU_API_BASE "/im/v1/messages/%s/reply"
+
+/* ── Credentials & token state ─────────────────────────────── */
+static char s_app_id[64] = MIMI_SECRET_FEISHU_APP_ID;
+static char s_app_secret[128] = MIMI_SECRET_FEISHU_APP_SECRET;
+static char s_tenant_token[512] = {0};
+static int64_t s_token_expire_time = 0;
+
+/* ── Message deduplication ─────────────────────────────────── */
+#define FEISHU_DEDUP_CACHE_SIZE 64
+
+static uint64_t s_seen_msg_keys[FEISHU_DEDUP_CACHE_SIZE] = {0};
+static size_t s_seen_msg_idx = 0;
+
+static uint64_t fnv1a64(const char *s)
+{
+    uint64_t h = 1469598103934665603ULL;
+    if (!s) return h;
+    while (*s) {
+        h ^= (unsigned char)(*s++);
+        h *= 1099511628211ULL;
+    }
+    return h;
+}
+
+static bool dedup_check_and_record(const char *message_id)
+{
+    uint64_t key = fnv1a64(message_id);
+    for (size_t i = 0; i < FEISHU_DEDUP_CACHE_SIZE; i++) {
+        if (s_seen_msg_keys[i] == key) return true;
+    }
+    s_seen_msg_keys[s_seen_msg_idx] = key;
+    s_seen_msg_idx = (s_seen_msg_idx + 1) % FEISHU_DEDUP_CACHE_SIZE;
+    return false;
+}
+
+/* ── HTTP response accumulator ─────────────────────────────── */
+typedef struct {
+    char *buf;
+    size_t len;
+    size_t cap;
+} http_resp_t;
+
+static esp_err_t http_event_handler(esp_http_client_event_t *evt)
+{
+    http_resp_t *resp = (http_resp_t *)evt->user_data;
+    if (evt->event_id == HTTP_EVENT_ON_DATA) {
+        if (resp->len + evt->data_len >= resp->cap) {
+            size_t new_cap = resp->cap * 2;
+            if (new_cap < resp->len + evt->data_len + 1) {
+                new_cap = resp->len + evt->data_len + 1;
+            }
+            char *tmp = realloc(resp->buf, new_cap);
+            if (!tmp) return ESP_ERR_NO_MEM;
+            resp->buf = tmp;
+            resp->cap = new_cap;
+        }
+        memcpy(resp->buf + resp->len, evt->data, evt->data_len);
+        resp->len += evt->data_len;
+        resp->buf[resp->len] = '\0';
+    }
+    return ESP_OK;
+}
+
+/* ── Get / refresh tenant access token ─────────────────────── */
+static esp_err_t feishu_get_tenant_token(void)
+{
+    if (s_app_id[0] == '\0' || s_app_secret[0] == '\0') {
+        ESP_LOGW(TAG, "No Feishu credentials configured");
+        return ESP_ERR_INVALID_STATE;
+    }
+
+    int64_t now = esp_timer_get_time() / 1000000LL;
+    if (s_tenant_token[0] != '\0' && s_token_expire_time > now + 300) {
+        return ESP_OK;
+    }
+
+    cJSON *body = cJSON_CreateObject();
+    cJSON_AddStringToObject(body, "app_id", s_app_id);
+    cJSON_AddStringToObject(body, "app_secret", s_app_secret);
+    char *json_str = cJSON_PrintUnformatted(body);
+    cJSON_Delete(body);
+    if (!json_str) return ESP_ERR_NO_MEM;
+
+    http_resp_t resp = { .buf = calloc(1, 2048), .len = 0, .cap = 2048 };
+    if (!resp.buf) { free(json_str); return ESP_ERR_NO_MEM; }
+
+    esp_http_client_config_t config = {
+        .url = FEISHU_AUTH_URL,
+        .event_handler = http_event_handler,
+        .user_data = &resp,
+        .timeout_ms = 10000,
+        .buffer_size = 2048,
+        .buffer_size_tx = 2048,
+        .crt_bundle_attach = esp_crt_bundle_attach,
+    };
+
+    esp_http_client_handle_t client = esp_http_client_init(&config);
+    if (!client) { free(json_str); free(resp.buf); return ESP_FAIL; }
+
+    esp_http_client_set_method(client, HTTP_METHOD_POST);
+    esp_http_client_set_header(client, "Content-Type", "application/json");
+    esp_http_client_set_post_field(client, json_str, strlen(json_str));
+
+    esp_err_t err = esp_http_client_perform(client);
+    esp_http_client_cleanup(client);
+    free(json_str);
+
+    if (err != ESP_OK) {
+        ESP_LOGE(TAG, "Token request HTTP failed: %s", esp_err_to_name(err));
+        free(resp.buf);
+        return err;
+    }
+
+    cJSON *root = cJSON_Parse(resp.buf);
+    free(resp.buf);
+    if (!root) { ESP_LOGE(TAG, "Failed to parse token response"); return ESP_FAIL; }
+
+    cJSON *code = cJSON_GetObjectItem(root, "code");
+    if (!code || code->valueint != 0) {
+        ESP_LOGE(TAG, "Token request failed: code=%d", code ? code->valueint : -1);
+        cJSON_Delete(root);
+        return ESP_FAIL;
+    }
+
+    cJSON *token = cJSON_GetObjectItem(root, "tenant_access_token");
+    cJSON *expire = cJSON_GetObjectItem(root, "expire");
+
+    if (token && cJSON_IsString(token)) {
+        strncpy(s_tenant_token, token->valuestring, sizeof(s_tenant_token) - 1);
+        s_token_expire_time = now + (expire ? expire->valueint : 7200) - 300;
+        ESP_LOGI(TAG, "Got tenant access token (expires in %ds)",
+                 expire ? expire->valueint : 7200);
+    }
+
+    cJSON_Delete(root);
+    return ESP_OK;
+}
+
+/* ── Feishu API call helper ────────────────────────────────── */
+static char *feishu_api_call(const char *url, const char *method, const char *post_data)
+{
+    if (feishu_get_tenant_token() != ESP_OK) return NULL;
+
+    http_resp_t resp = { .buf = calloc(1, 4096), .len = 0, .cap = 4096 };
+    if (!resp.buf) return NULL;
+
+    esp_http_client_config_t config = {
+        .url = url,
+        .event_handler = http_event_handler,
+        .user_data = &resp,
+        .timeout_ms = 15000,
+        .buffer_size = 2048,
+        .buffer_size_tx = 2048,
+        .crt_bundle_attach = esp_crt_bundle_attach,
+    };
+
+    esp_http_client_handle_t client = esp_http_client_init(&config);
+    if (!client) { free(resp.buf); return NULL; }
+
+    char auth_header[600];
+    snprintf(auth_header, sizeof(auth_header), "Bearer %s", s_tenant_token);
+    esp_http_client_set_header(client, "Authorization", auth_header);
+    esp_http_client_set_header(client, "Content-Type", "application/json; charset=utf-8");
+
+    if (strcmp(method, "POST") == 0) {
+        esp_http_client_set_method(client, HTTP_METHOD_POST);
+        if (post_data) {
+            esp_http_client_set_post_field(client, post_data, strlen(post_data));
+        }
+    }
+
+    esp_err_t err = esp_http_client_perform(client);
+    esp_http_client_cleanup(client);
+
+    if (err != ESP_OK) {
+        ESP_LOGE(TAG, "API call failed: %s", esp_err_to_name(err));
+        free(resp.buf);
+        return NULL;
+    }
+
+    return resp.buf;
+}
+
+/* ── Webhook event handler ─────────────────────────────────── */
+
+/*
+ * Feishu Event Callback v2 schema:
+ * {
+ *   "schema": "2.0",
+ *   "header": { "event_type": "im.message.receive_v1", "event_id": "...", ... },
+ *   "event": {
+ *     "sender": { "sender_id": { "open_id": "ou_xxx" }, "sender_type": "user" },
+ *     "message": {
+ *       "message_id": "om_xxx",
+ *       "chat_id": "oc_xxx",
+ *       "chat_type": "p2p" | "group",
+ *       "message_type": "text",
+ *       "content": "{\"text\":\"hello\"}"
+ *     }
+ *   }
+ * }
+ *
+ * URL verification challenge:
+ * { "challenge": "xxx", "token": "yyy", "type": "url_verification" }
+ */
+
+static void handle_message_event(cJSON *event)
+{
+    cJSON *message = cJSON_GetObjectItem(event, "message");
+    if (!message) return;
+
+    cJSON *message_id_j = cJSON_GetObjectItem(message, "message_id");
+    cJSON *chat_id_j    = cJSON_GetObjectItem(message, "chat_id");
+    cJSON *chat_type_j  = cJSON_GetObjectItem(message, "chat_type");
+    cJSON *msg_type_j   = cJSON_GetObjectItem(message, "message_type");
+    cJSON *content_j    = cJSON_GetObjectItem(message, "content");
+
+    if (!chat_id_j || !cJSON_IsString(chat_id_j)) return;
+    if (!content_j || !cJSON_IsString(content_j)) return;
+
+    const char *message_id = cJSON_IsString(message_id_j) ? message_id_j->valuestring : "";
+    const char *chat_id    = chat_id_j->valuestring;
+    const char *chat_type  = cJSON_IsString(chat_type_j) ? chat_type_j->valuestring : "p2p";
+    const char *msg_type   = cJSON_IsString(msg_type_j) ? msg_type_j->valuestring : "text";
+
+    /* Deduplication */
+    if (message_id[0] && dedup_check_and_record(message_id)) {
+        ESP_LOGD(TAG, "Duplicate message %s, skipping", message_id);
+        return;
+    }
+
+    /* Only handle text messages for now */
+    if (strcmp(msg_type, "text") != 0) {
+        ESP_LOGI(TAG, "Ignoring non-text message type: %s", msg_type);
+        return;
+    }
+
+    /* Parse the content JSON to extract text */
+    cJSON *content_obj = cJSON_Parse(content_j->valuestring);
+    if (!content_obj) {
+        ESP_LOGW(TAG, "Failed to parse message content JSON");
+        return;
+    }
+
+    cJSON *text_j = cJSON_GetObjectItem(content_obj, "text");
+    if (!text_j || !cJSON_IsString(text_j)) {
+        cJSON_Delete(content_obj);
+        return;
+    }
+
+    const char *text = text_j->valuestring;
+
+    /* Strip @bot mention prefix if present (Feishu adds @_user_1 for mentions) */
+    const char *cleaned = text;
+    if (strncmp(cleaned, "@_user_1 ", 9) == 0) {
+        cleaned += 9;
+    }
+    /* Skip leading whitespace */
+    while (*cleaned == ' ' || *cleaned == '\n') cleaned++;
+
+    if (cleaned[0] == '\0') {
+        cJSON_Delete(content_obj);
+        return;
+    }
+
+    /* Get sender info */
+    const char *sender_id = "";
+    cJSON *sender = cJSON_GetObjectItem(event, "sender");
+    if (sender) {
+        cJSON *sender_id_obj = cJSON_GetObjectItem(sender, "sender_id");
+        if (sender_id_obj) {
+            cJSON *open_id = cJSON_GetObjectItem(sender_id_obj, "open_id");
+            if (open_id && cJSON_IsString(open_id)) {
+                sender_id = open_id->valuestring;
+            }
+        }
+    }
+
+    ESP_LOGI(TAG, "Message from %s in %s(%s): %.60s%s",
+             sender_id, chat_id, chat_type, cleaned,
+             strlen(cleaned) > 60 ? "..." : "");
+
+    /* For p2p (DM) chats, use sender open_id as chat_id for session routing.
+     * For group chats, use the chat_id (group ID).
+     * This matches the moltbot reference pattern where DMs route by sender. */
+    const char *route_id = chat_id;
+    if (strcmp(chat_type, "p2p") == 0 && sender_id[0]) {
+        route_id = sender_id;
+    }
+
+    /* Push to inbound message bus */
+    mimi_msg_t msg = {0};
+    strncpy(msg.channel, MIMI_CHAN_FEISHU, sizeof(msg.channel) - 1);
+    strncpy(msg.chat_id, route_id, sizeof(msg.chat_id) - 1);
+    msg.content = strdup(cleaned);
+
+    if (msg.content) {
+        if (message_bus_push_inbound(&msg) != ESP_OK) {
+            ESP_LOGW(TAG, "Inbound queue full, dropping feishu message");
+            free(msg.content);
+        }
+    }
+
+    cJSON_Delete(content_obj);
+}
+
+static esp_err_t feishu_webhook_handler(httpd_req_t *req)
+{
+    /* Read request body */
+    int content_len = req->content_len;
+    if (content_len <= 0 || content_len > MIMI_FEISHU_WEBHOOK_MAX_BODY) {
+        ESP_LOGW(TAG, "Invalid content length: %d", content_len);
+        httpd_resp_send_err(req, HTTPD_400_BAD_REQUEST, "Invalid body");
+        return ESP_FAIL;
+    }
+
+    char *body = calloc(1, content_len + 1);
+    if (!body) {
+        httpd_resp_send_err(req, HTTPD_500_INTERNAL_SERVER_ERROR, "OOM");
+        return ESP_ERR_NO_MEM;
+    }
+
+    int received = 0;
+    while (received < content_len) {
+        int ret = httpd_req_recv(req, body + received, content_len - received);
+        if (ret <= 0) {
+            free(body);
+            if (ret == HTTPD_SOCK_ERR_TIMEOUT) {
+                httpd_resp_send_err(req, HTTPD_408_REQ_TIMEOUT, "Timeout");
+            }
+            return ESP_FAIL;
+        }
+        received += ret;
+    }
+    body[content_len] = '\0';
+
+    ESP_LOGD(TAG, "Webhook body: %.200s", body);
+
+    cJSON *root = cJSON_Parse(body);
+    free(body);
+
+    if (!root) {
+        ESP_LOGW(TAG, "Failed to parse webhook JSON");
+        httpd_resp_send_err(req, HTTPD_400_BAD_REQUEST, "Bad JSON");
+        return ESP_FAIL;
+    }
+
+    /* URL verification challenge */
+    cJSON *type_j = cJSON_GetObjectItem(root, "type");
+    if (type_j && cJSON_IsString(type_j) &&
+        strcmp(type_j->valuestring, "url_verification") == 0) {
+        cJSON *challenge = cJSON_GetObjectItem(root, "challenge");
+        if (challenge && cJSON_IsString(challenge)) {
+            ESP_LOGI(TAG, "URL verification challenge received");
+            cJSON *resp_obj = cJSON_CreateObject();
+            cJSON_AddStringToObject(resp_obj, "challenge", challenge->valuestring);
+            char *resp_str = cJSON_PrintUnformatted(resp_obj);
+            cJSON_Delete(resp_obj);
+            if (resp_str) {
+                httpd_resp_set_type(req, "application/json");
+                httpd_resp_sendstr(req, resp_str);
+                free(resp_str);
+            }
+            cJSON_Delete(root);
+            return ESP_OK;
+        }
+    }
+
+    /* Event callback v2 */
+    cJSON *header = cJSON_GetObjectItem(root, "header");
+    cJSON *event  = cJSON_GetObjectItem(root, "event");
+
+    if (header && event) {
+        /* Check for duplicate event_id */
+        cJSON *event_id = cJSON_GetObjectItem(header, "event_id");
+        if (event_id && cJSON_IsString(event_id)) {
+            if (dedup_check_and_record(event_id->valuestring)) {
+                ESP_LOGD(TAG, "Duplicate event %s, skipping", event_id->valuestring);
+                httpd_resp_sendstr(req, "{\"code\":0}");
+                cJSON_Delete(root);
+                return ESP_OK;
+            }
+        }
+
+        cJSON *event_type = cJSON_GetObjectItem(header, "event_type");
+        if (event_type && cJSON_IsString(event_type)) {
+            const char *et = event_type->valuestring;
+            if (strcmp(et, "im.message.receive_v1") == 0) {
+                handle_message_event(event);
+            } else {
+                ESP_LOGI(TAG, "Unhandled event type: %s", et);
+            }
+        }
+    }
+
+    /* Always respond 200 OK to Feishu to prevent retries */
+    httpd_resp_set_type(req, "application/json");
+    httpd_resp_sendstr(req, "{\"code\":0}");
+
+    cJSON_Delete(root);
+    return ESP_OK;
+}
+
+/* ── Webhook HTTP server ───────────────────────────────────── */
+static httpd_handle_t s_webhook_server = NULL;
+
+static esp_err_t feishu_start_webhook_server(void)
+{
+    if (s_webhook_server) {
+        ESP_LOGW(TAG, "Webhook server already running");
+        return ESP_OK;
+    }
+
+    httpd_config_t config = HTTPD_DEFAULT_CONFIG();
+    config.server_port = MIMI_FEISHU_WEBHOOK_PORT;
+    config.stack_size = MIMI_FEISHU_POLL_STACK;
+    config.max_uri_handlers = 4;
+    config.lru_purge_enable = true;
+
+    esp_err_t err = httpd_start(&s_webhook_server, &config);
+    if (err != ESP_OK) {
+        ESP_LOGE(TAG, "Failed to start webhook server: %s", esp_err_to_name(err));
+        return err;
+    }
+
+    /* Register the webhook endpoint */
+    httpd_uri_t webhook_uri = {
+        .uri = MIMI_FEISHU_WEBHOOK_PATH,
+        .method = HTTP_POST,
+        .handler = feishu_webhook_handler,
+        .user_ctx = NULL,
+    };
+    httpd_register_uri_handler(s_webhook_server, &webhook_uri);
+
+    ESP_LOGI(TAG, "Feishu webhook server started on port %d, path: %s",
+             MIMI_FEISHU_WEBHOOK_PORT, MIMI_FEISHU_WEBHOOK_PATH);
+
+    return ESP_OK;
+}
+
+/* ── Public API ────────────────────────────────────────────── */
+
+esp_err_t feishu_bot_init(void)
+{
+    nvs_handle_t nvs;
+    if (nvs_open(MIMI_NVS_FEISHU, NVS_READONLY, &nvs) == ESP_OK) {
+        char tmp_id[64] = {0};
+        char tmp_secret[128] = {0};
+        size_t len_id = sizeof(tmp_id);
+        size_t len_secret = sizeof(tmp_secret);
+
+        if (nvs_get_str(nvs, MIMI_NVS_KEY_FEISHU_APP_ID, tmp_id, &len_id) == ESP_OK && tmp_id[0]) {
+            strncpy(s_app_id, tmp_id, sizeof(s_app_id) - 1);
+        }
+        if (nvs_get_str(nvs, MIMI_NVS_KEY_FEISHU_APP_SECRET, tmp_secret, &len_secret) == ESP_OK && tmp_secret[0]) {
+            strncpy(s_app_secret, tmp_secret, sizeof(s_app_secret) - 1);
+        }
+        nvs_close(nvs);
+    }
+
+    if (s_app_id[0] && s_app_secret[0]) {
+        ESP_LOGI(TAG, "Feishu credentials loaded (app_id=%.8s...)", s_app_id);
+    } else {
+        ESP_LOGW(TAG, "No Feishu credentials. Use CLI: set_feishu_creds <APP_ID> <APP_SECRET>");
+    }
+
+    return ESP_OK;
+}
+
+esp_err_t feishu_bot_start(void)
+{
+    if (s_app_id[0] == '\0' || s_app_secret[0] == '\0') {
+        ESP_LOGW(TAG, "Feishu not configured, skipping webhook server start");
+        return ESP_OK;
+    }
+
+    /* Pre-fetch tenant token so we're ready to send immediately */
+    esp_err_t token_err = feishu_get_tenant_token();
+    if (token_err != ESP_OK) {
+        ESP_LOGW(TAG, "Initial token fetch failed (will retry on first API call)");
+    }
+
+    return feishu_start_webhook_server();
+}
+
+esp_err_t feishu_send_message(const char *chat_id, const char *text)
+{
+    if (s_app_id[0] == '\0' || s_app_secret[0] == '\0') {
+        ESP_LOGW(TAG, "Cannot send: no credentials configured");
+        return ESP_ERR_INVALID_STATE;
+    }
+
+    /* Determine receive_id_type based on ID prefix */
+    const char *id_type = "chat_id";
+    if (strncmp(chat_id, "ou_", 3) == 0) {
+        id_type = "open_id";
+    }
+
+    char url[256];
+    snprintf(url, sizeof(url), "%s?receive_id_type=%s", FEISHU_SEND_MSG_URL, id_type);
+
+    size_t text_len = strlen(text);
+    size_t offset = 0;
+    int all_ok = 1;
+
+    while (offset < text_len) {
+        size_t chunk = text_len - offset;
+        if (chunk > MIMI_FEISHU_MAX_MSG_LEN) {
+            chunk = MIMI_FEISHU_MAX_MSG_LEN;
+        }
+
+        char *segment = malloc(chunk + 1);
+        if (!segment) return ESP_ERR_NO_MEM;
+        memcpy(segment, text + offset, chunk);
+        segment[chunk] = '\0';
+
+        /* Build content JSON: {"text":"..."} */
+        cJSON *content = cJSON_CreateObject();
+        cJSON_AddStringToObject(content, "text", segment);
+        char *content_str = cJSON_PrintUnformatted(content);
+        cJSON_Delete(content);
+        free(segment);
+
+        if (!content_str) { offset += chunk; all_ok = 0; continue; }
+
+        /* Build message body */
+        cJSON *body = cJSON_CreateObject();
+        cJSON_AddStringToObject(body, "receive_id", chat_id);
+        cJSON_AddStringToObject(body, "msg_type", "text");
+        cJSON_AddStringToObject(body, "content", content_str);
+        free(content_str);
+
+        char *json_str = cJSON_PrintUnformatted(body);
+        cJSON_Delete(body);
+
+        if (json_str) {
+            char *resp = feishu_api_call(url, "POST", json_str);
+            free(json_str);
+
+            if (resp) {
+                cJSON *root = cJSON_Parse(resp);
+                if (root) {
+                    cJSON *code = cJSON_GetObjectItem(root, "code");
+                    if (code && code->valueint != 0) {
+                        cJSON *msg = cJSON_GetObjectItem(root, "msg");
+                        ESP_LOGW(TAG, "Send failed: code=%d, msg=%s",
+                                 code->valueint, msg ? msg->valuestring : "unknown");
+                        all_ok = 0;
+                    } else {
+                        ESP_LOGI(TAG, "Sent to %s (%d bytes)", chat_id, (int)chunk);
+                    }
+                    cJSON_Delete(root);
+                }
+                free(resp);
+            } else {
+                ESP_LOGE(TAG, "Failed to send message chunk");
+                all_ok = 0;
+            }
+        }
+
+        offset += chunk;
+    }
+
+    return all_ok ? ESP_OK : ESP_FAIL;
+}
+
+esp_err_t feishu_reply_message(const char *message_id, const char *text)
+{
+    if (s_app_id[0] == '\0' || s_app_secret[0] == '\0') {
+        return ESP_ERR_INVALID_STATE;
+    }
+
+    char url[256];
+    snprintf(url, sizeof(url), FEISHU_REPLY_MSG_URL, message_id);
+
+    cJSON *content = cJSON_CreateObject();
+    cJSON_AddStringToObject(content, "text", text);
+    char *content_str = cJSON_PrintUnformatted(content);
+    cJSON_Delete(content);
+    if (!content_str) return ESP_ERR_NO_MEM;
+
+    cJSON *body = cJSON_CreateObject();
+    cJSON_AddStringToObject(body, "msg_type", "text");
+    cJSON_AddStringToObject(body, "content", content_str);
+    free(content_str);
+
+    char *json_str = cJSON_PrintUnformatted(body);
+    cJSON_Delete(body);
+    if (!json_str) return ESP_ERR_NO_MEM;
+
+    char *resp = feishu_api_call(url, "POST", json_str);
+    free(json_str);
+
+    esp_err_t ret = ESP_FAIL;
+    if (resp) {
+        cJSON *root = cJSON_Parse(resp);
+        if (root) {
+            cJSON *code = cJSON_GetObjectItem(root, "code");
+            if (code && code->valueint == 0) {
+                ret = ESP_OK;
+            } else {
+                cJSON *msg = cJSON_GetObjectItem(root, "msg");
+                ESP_LOGW(TAG, "Reply failed: code=%d, msg=%s",
+                         code ? code->valueint : -1, msg ? msg->valuestring : "unknown");
+            }
+            cJSON_Delete(root);
+        }
+        free(resp);
+    }
+
+    return ret;
+}
+
+esp_err_t feishu_set_credentials(const char *app_id, const char *app_secret)
+{
+    nvs_handle_t nvs;
+    ESP_ERROR_CHECK(nvs_open(MIMI_NVS_FEISHU, NVS_READWRITE, &nvs));
+    ESP_ERROR_CHECK(nvs_set_str(nvs, MIMI_NVS_KEY_FEISHU_APP_ID, app_id));
+    ESP_ERROR_CHECK(nvs_set_str(nvs, MIMI_NVS_KEY_FEISHU_APP_SECRET, app_secret));
+    ESP_ERROR_CHECK(nvs_commit(nvs));
+    nvs_close(nvs);
+
+    strncpy(s_app_id, app_id, sizeof(s_app_id) - 1);
+    strncpy(s_app_secret, app_secret, sizeof(s_app_secret) - 1);
+
+    /* Clear cached token to force re-auth */
+    s_tenant_token[0] = '\0';
+    s_token_expire_time = 0;
+
+    ESP_LOGI(TAG, "Feishu credentials saved");
+    return ESP_OK;
+}