diff --git a/common/src/error/mod.rs b/common/src/error/mod.rs
new file mode 100644
index 0000000..e8ae652
--- /dev/null
+++ b/common/src/error/mod.rs
@@ -0,0 +1 @@
+pub mod queue;
diff --git a/common/src/error/queue.rs b/common/src/error/queue.rs
new file mode 100644
index 0000000..e69de29
diff --git a/common/src/model/ai.rs b/common/src/model/ai.rs
new file mode 100644
index 0000000..e5833b0
--- /dev/null
+++ b/common/src/model/ai.rs
@@ -0,0 +1,120 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Serialize)]
+pub struct ChatCompletionRequestBody {
+    pub model: String,
+    pub messages: Vec<ChatCompletionRequestMessage>,
+    pub stream: bool,
+    pub tools: Vec<serde_json::Value>,
+    pub extra_body: Option<ChatCompletionRequestExtra>,
+}
+#[derive(Debug, Serialize)]
+pub struct ChatCompletionRequestExtra {
+    pub thinking: ChatCompletionRequestThinking,
+}
+#[derive(Debug, Serialize)]
+pub struct ChatCompletionRequestThinking {
+    #[serde(rename = "type")]
+    pub thinking_type: String,
+}
+
+#[derive(Debug, Clone, Serialize)]
+pub struct ChatCompletionRequestMessage {
+    pub role: String,
+    pub content: String,
+    pub tool_call_id: Option<String>,
+    pub tool_calls: Option<Vec<ChatCompletionToolCall>>,
+}
+impl ChatCompletionRequestMessage {
+    pub fn new(role: String, content: String) -> Self {
+        Self {
+            role,
+            content,
+            tool_call_id: None,
+            tool_calls: None,
+        }
+    }
+    pub fn assistant(
+        role: String,
+        content: String,
+        tool_calls: Option<Vec<ChatCompletionToolCall>>,
+    ) -> Self {
+        Self {
+            role,
+            content,
+            tool_call_id: None,
+            tool_calls: tool_calls,
+        }
+    }
+
+    pub fn tool(role: String, content: String, tool_call_id: String) -> Self {
+        Self {
+            role,
+            content,
+            tool_call_id: Some(tool_call_id),
+            tool_calls: None,
+        }
+    }
+}
+
+// {"choices":[{"finish_reason":"stop","index":0,"logprobs":null,"message":{"content":"你好！😊 有什么我可以帮你的吗？","role":"assistant"}}],"created":1782208455,"id":"02178220845277286f296e4c58ddf650991f54d763d292af8529b","model":"deepseek-v4-flash-260425","service_tier":"default","object":"chat.completion","usage":{"prompt_tokens":2005,"completion_tokens":125,"total_tokens":2130,"prompt_tokens_details":{"cached_tokens":0},"completion_tokens_details":{"reasoning_tokens":114}}}
+#[allow(dead_code)]
+#[derive(Debug, Deserialize)]
+pub struct ChatCompletionResponseBody {
+    id: String,
+    object: String,
+    created: i64,
+    model: String,
+    service_tier: String,
+    pub choices: Vec<ChatCompletionResponseChoice>,
+    pub usage: ChatCompletionUsage,
+}
+
+#[allow(dead_code)]
+#[derive(Debug, Deserialize)]
+pub struct ChatCompletionResponseChoice {
+    index: u32,
+    pub message: ChatCompletionResponseMessage,
+    logprobs: Option<serde_json::Value>,
+    finish_reason: String,
+}
+#[allow(dead_code)]
+#[derive(Debug, Deserialize)]
+pub struct ChatCompletionResponseMessage {
+    pub role: String,
+    pub content: String,
+    pub reasoning_content: Option<String>,
+    pub tool_calls: Option<Vec<ChatCompletionToolCall>>,
+}
+#[derive(Debug, Clone, Deserialize, Serialize)]
+pub struct ChatCompletionToolCall {
+    pub function: Option<ChatCompletionFunction>,
+    pub id: String,
+    #[serde(rename = "type")]
+    pub call_type: String,
+}
+#[derive(Debug, Clone, Deserialize, Serialize)]
+pub struct ChatCompletionFunction {
+    pub arguments: String,
+    pub name: String,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct ChatCompletionUsage {
+    pub prompt_tokens: u32,
+    pub completion_tokens: u32,
+    pub total_tokens: u32,
+    pub prompt_tokens_details: ChatCompletionUsagePrompt,
+    pub completion_tokens_details: ChatCompletionUsageCompletion,
+}
+
+#[allow(dead_code)]
+#[derive(Debug, Deserialize)]
+pub struct ChatCompletionUsagePrompt {
+    pub cached_tokens: u32,
+}
+#[allow(dead_code)]
+#[derive(Debug, Deserialize)]
+pub struct ChatCompletionUsageCompletion {
+    pub reasoning_tokens: u32,
+}
diff --git a/common/src/model/mod.rs b/common/src/model/mod.rs
new file mode 100644
index 0000000..4c704d3
--- /dev/null
+++ b/common/src/model/mod.rs
@@ -0,0 +1 @@
+pub mod ai;