diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..91f8c4d
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "PicoBot"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+reqwest = { version = "0.12", default-features = false, features = ["json", "rustls-tls"] }
+dotenv = "0.15"
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+async-trait = "0.1"
+thiserror = "1.0"
+tokio = { version = "1.0", features = ["full"] }
diff --git a/src/config/mod.rs b/src/config/mod.rs
new file mode 100644
index 0000000..798d014
--- /dev/null
+++ b/src/config/mod.rs
@@ -0,0 +1,132 @@
+use serde::{Deserialize, Serialize};
+use std::collections::HashMap;
+use std::fs;
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+pub struct Config {
+    pub providers: HashMap<String, ProviderConfig>,
+    pub models: HashMap<String, ModelConfig>,
+    pub agents: HashMap<String, AgentConfig>,
+}
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+pub struct ProviderConfig {
+    #[serde(rename = "type")]
+    pub provider_type: String,
+    pub base_url: String,
+    pub api_key: String,
+    #[serde(default)]
+    pub extra_headers: HashMap<String, String>,
+}
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+pub struct ModelConfig {
+    pub model_id: String,
+    #[serde(default)]
+    pub temperature: Option<f32>,
+    #[serde(default)]
+    pub max_tokens: Option<u32>,
+    #[serde(flatten)]
+    pub extra: HashMap<String, serde_json::Value>,
+}
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+pub struct AgentConfig {
+    pub provider: String,
+    pub model: String,
+}
+
+#[derive(Debug, Clone)]
+pub struct LLMProviderConfig {
+    pub provider_type: String,
+    pub name: String,
+    pub base_url: String,
+    pub api_key: String,
+    pub extra_headers: HashMap<String, String>,
+    pub model_id: String,
+    pub temperature: Option<f32>,
+    pub max_tokens: Option<u32>,
+    pub model_extra: HashMap<String, serde_json::Value>,
+}
+
+impl Config {
+    pub fn load(path: &str) -> Result<Self, Box<dyn std::error::Error>> {
+        let content = fs::read_to_string(path)?;
+        let config: Config = serde_json::from_str(&content)?;
+        Ok(config)
+    }
+
+    pub fn get_provider_config(&self, agent_name: &str) -> Result<LLMProviderConfig, ConfigError> {
+        let agent = self.agents.get(agent_name)
+            .ok_or(ConfigError::AgentNotFound(agent_name.to_string()))?;
+
+        let provider = self.providers.get(&agent.provider)
+            .ok_or(ConfigError::ProviderNotFound(agent.provider.clone()))?;
+
+        let model = self.models.get(&agent.model)
+            .ok_or(ConfigError::ModelNotFound(agent.model.clone()))?;
+
+        Ok(LLMProviderConfig {
+            provider_type: provider.provider_type.clone(),
+            name: agent.provider.clone(),
+            base_url: provider.base_url.clone(),
+            api_key: provider.api_key.clone(),
+            extra_headers: provider.extra_headers.clone(),
+            model_id: model.model_id.clone(),
+            temperature: model.temperature,
+            max_tokens: model.max_tokens,
+            model_extra: model.extra.clone(),
+        })
+    }
+}
+
+#[derive(Debug)]
+pub enum ConfigError {
+    AgentNotFound(String),
+    ProviderNotFound(String),
+    ModelNotFound(String),
+}
+
+impl std::fmt::Display for ConfigError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            ConfigError::AgentNotFound(name) => write!(f, "Agent not found: {}", name),
+            ConfigError::ProviderNotFound(name) => write!(f, "Provider not found: {}", name),
+            ConfigError::ModelNotFound(name) => write!(f, "Model not found: {}", name),
+        }
+    }
+}
+
+impl std::error::Error for ConfigError {}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_config_load() {
+        let config = Config::load("config.json").unwrap();
+
+        // Check providers
+        assert!(config.providers.contains_key("volcengine"));
+        assert!(config.providers.contains_key("aliyun"));
+
+        // Check models
+        assert!(config.models.contains_key("doubao-seed-2-0-lite-260215"));
+        assert!(config.models.contains_key("qwen-plus"));
+
+        // Check agents
+        assert!(config.agents.contains_key("default"));
+    }
+
+    #[test]
+    fn test_get_provider_config() {
+        let config = Config::load("config.json").unwrap();
+        let provider_config = config.get_provider_config("default").unwrap();
+
+        assert_eq!(provider_config.provider_type, "openai");
+        assert_eq!(provider_config.name, "aliyun");
+        assert_eq!(provider_config.model_id, "qwen-plus");
+        assert_eq!(provider_config.temperature, Some(0.0));
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..4e2fd8e
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,2 @@
+pub mod config;
+pub mod providers;
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..6f7cadc
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,38 @@
+mod config;
+mod providers;
+
+use config::Config;
+use providers::{create_provider, ChatCompletionRequest, Message};
+
+#[tokio::main]
+async fn main() {
+    // Load config
+    let config = Config::load("config.json").expect("Failed to load config.json");
+
+    // Get provider config for "default" agent
+    let provider_config = config.get_provider_config("default").expect("Failed to get provider config");
+
+    // Create provider
+    let provider = create_provider(provider_config).expect("Failed to create provider");
+
+    println!("Provider type: {}", provider.ptype());
+    println!("Provider name: {}", provider.name());
+    println!("Model ID: {}", provider.model_id());
+
+    // Create request (no model ID needed - it's baked into the provider)
+    let request = ChatCompletionRequest {
+        messages: vec![Message {
+            role: "user".to_string(),
+            content: "Hello!".to_string(),
+        }],
+        temperature: None,  // Will use config default if not provided
+        max_tokens: None,   // Will use config default if not provided
+        tools: None,
+    };
+
+    // Example usage:
+    // match provider.chat(request).await {
+    //     Ok(resp) => println!("Response: {}", resp.content),
+    //     Err(e) => eprintln!("Error: {}", e),
+    // }
+}
diff --git a/src/providers/anthropic.rs b/src/providers/anthropic.rs
new file mode 100644
index 0000000..9b06156
--- /dev/null
+++ b/src/providers/anthropic.rs
@@ -0,0 +1,198 @@
+use async_trait::async_trait;
+use reqwest::Client;
+use serde::{Deserialize, Serialize};
+use std::collections::HashMap;
+
+use super::{ChatCompletionRequest, ChatCompletionResponse, LLMProvider, Tool, ToolCall};
+use super::traits::Usage;
+
+pub struct AnthropicProvider {
+    client: Client,
+    name: String,
+    api_key: String,
+    base_url: String,
+    extra_headers: HashMap<String, String>,
+    model_id: String,
+    temperature: Option<f32>,
+    max_tokens: Option<u32>,
+    model_extra: HashMap<String, serde_json::Value>,
+}
+
+impl AnthropicProvider {
+    pub fn new(
+        name: String,
+        api_key: String,
+        base_url: String,
+        extra_headers: HashMap<String, String>,
+        model_id: String,
+        temperature: Option<f32>,
+        max_tokens: Option<u32>,
+        model_extra: HashMap<String, serde_json::Value>,
+    ) -> Self {
+        Self {
+            client: Client::new(),
+            name,
+            api_key,
+            base_url,
+            extra_headers,
+            model_id,
+            temperature,
+            max_tokens,
+            model_extra,
+        }
+    }
+}
+
+#[derive(Serialize)]
+struct AnthropicRequest {
+    model: String,
+    messages: Vec<AnthropicMessage>,
+    max_tokens: u32,
+    temperature: Option<f32>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    tools: Option<Vec<AnthropicTool>>,
+    #[serde(flatten)]
+    extra: HashMap<String, serde_json::Value>,
+}
+
+#[derive(Serialize)]
+struct AnthropicMessage {
+    role: String,
+    content: String,
+}
+
+#[derive(Serialize)]
+struct AnthropicTool {
+    name: String,
+    description: String,
+    input_schema: serde_json::Value,
+}
+
+#[derive(Deserialize)]
+struct AnthropicResponse {
+    id: String,
+    model: String,
+    content: Vec<AnthropicContent>,
+    usage: AnthropicUsage,
+}
+
+#[derive(Deserialize)]
+#[serde(tag = "type", rename_all = "snake_case")]
+enum AnthropicContent {
+    Text { text: String },
+    Thinking { thinking: String },
+    #[serde(rename = "tool_use")]
+    ToolUse {
+        id: String,
+        name: String,
+        input: serde_json::Value,
+    },
+}
+
+#[derive(Deserialize)]
+struct AnthropicUsage {
+    input_tokens: u32,
+    output_tokens: u32,
+}
+
+#[async_trait]
+impl LLMProvider for AnthropicProvider {
+    async fn chat(
+        &self,
+        request: ChatCompletionRequest,
+    ) -> Result<ChatCompletionResponse, Box<dyn std::error::Error + Send + Sync>> {
+        let url = format!("{}/v1/messages", self.base_url);
+        let max_tokens = request.max_tokens.or(self.max_tokens).unwrap_or(1024);
+
+        let tools = request.tools.map(|tools| {
+            tools
+                .iter()
+                .map(|t: &Tool| AnthropicTool {
+                    name: t.function.name.clone(),
+                    description: t.function.description.clone(),
+                    input_schema: t.function.parameters.clone(),
+                })
+                .collect()
+        });
+
+        let body = AnthropicRequest {
+            model: self.model_id.clone(),
+            messages: request
+                .messages
+                .iter()
+                .map(|m| AnthropicMessage {
+                    role: m.role.clone(),
+                    content: m.content.clone(),
+                })
+                .collect(),
+            max_tokens,
+            temperature: request.temperature.or(self.temperature),
+            tools,
+            extra: self.model_extra.clone(),
+        };
+
+        let mut req_builder = self
+            .client
+            .post(&url)
+            .header("x-api-key", &self.api_key)
+            .header("anthropic-version", "2023-06-01")
+            .header("Content-Type", "application/json");
+
+        for (key, value) in &self.extra_headers {
+            req_builder = req_builder.header(key.as_str(), value.as_str());
+        }
+
+        let resp = req_builder.json(&body).send().await?;
+
+        let anthropic_resp: AnthropicResponse = resp.json().await?;
+
+        let mut content = String::new();
+        let mut tool_calls = Vec::new();
+
+        for c in &anthropic_resp.content {
+            match c {
+                AnthropicContent::Text { text } => {
+                    if !text.is_empty() {
+                        if !content.is_empty() {
+                            content.push('\n');
+                        }
+                        content.push_str(text);
+                    }
+                }
+                AnthropicContent::Thinking { .. } => {}
+                AnthropicContent::ToolUse { id, name, input } => {
+                    tool_calls.push(ToolCall {
+                        id: id.clone(),
+                        name: name.clone(),
+                        arguments: input.clone(),
+                    });
+                }
+            }
+        }
+
+        Ok(ChatCompletionResponse {
+            id: anthropic_resp.id,
+            model: anthropic_resp.model,
+            content,
+            tool_calls,
+            usage: Usage {
+                prompt_tokens: anthropic_resp.usage.input_tokens,
+                completion_tokens: anthropic_resp.usage.output_tokens,
+                total_tokens: anthropic_resp.usage.input_tokens
+                    + anthropic_resp.usage.output_tokens,
+            },
+        })
+    }
+
+    fn ptype(&self) -> &str {
+        "anthropic"
+    }
+
+    fn name(&self) -> &str {
+        &self.name
+    }
+
+    fn model_id(&self) -> &str {
+        &self.model_id
+    }
+}
diff --git a/src/providers/mod.rs b/src/providers/mod.rs
new file mode 100644
index 0000000..eedab44
--- /dev/null
+++ b/src/providers/mod.rs
@@ -0,0 +1,50 @@
+pub mod traits;
+pub mod openai;
+pub mod anthropic;
+
+pub use self::openai::OpenAIProvider;
+pub use self::anthropic::AnthropicProvider;
+
+use crate::config::LLMProviderConfig;
+pub use traits::{ChatCompletionRequest, ChatCompletionResponse, LLMProvider, Message, Tool, ToolCall, ToolFunction, Usage};
+
+pub fn create_provider(config: LLMProviderConfig) -> Result<Box<dyn LLMProvider>, ProviderError> {
+    match config.provider_type.as_str() {
+        "openai" => Ok(Box::new(OpenAIProvider::new(
+            config.name,
+            config.api_key,
+            config.base_url,
+            config.extra_headers,
+            config.model_id,
+            config.temperature,
+            config.max_tokens,
+            config.model_extra,
+        ))),
+        "anthropic" => Ok(Box::new(AnthropicProvider::new(
+            config.name,
+            config.api_key,
+            config.base_url,
+            config.extra_headers,
+            config.model_id,
+            config.temperature,
+            config.max_tokens,
+            config.model_extra,
+        ))),
+        _ => Err(ProviderError::UnknownProviderType(config.provider_type)),
+    }
+}
+
+#[derive(Debug)]
+pub enum ProviderError {
+    UnknownProviderType(String),
+}
+
+impl std::fmt::Display for ProviderError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            ProviderError::UnknownProviderType(t) => write!(f, "Unknown provider type: {}", t),
+        }
+    }
+}
+
+impl std::error::Error for ProviderError {}
diff --git a/src/providers/openai.rs b/src/providers/openai.rs
new file mode 100644
index 0000000..043b07b
--- /dev/null
+++ b/src/providers/openai.rs
@@ -0,0 +1,181 @@
+use async_trait::async_trait;
+use reqwest::Client;
+use serde::Deserialize;
+use serde_json::json;
+use std::collections::HashMap;
+
+use super::{ChatCompletionRequest, ChatCompletionResponse, LLMProvider, ToolCall};
+use super::traits::Usage;
+
+pub struct OpenAIProvider {
+    client: Client,
+    name: String,
+    api_key: String,
+    base_url: String,
+    extra_headers: HashMap<String, String>,
+    model_id: String,
+    temperature: Option<f32>,
+    max_tokens: Option<u32>,
+    model_extra: HashMap<String, serde_json::Value>,
+}
+
+impl OpenAIProvider {
+    pub fn new(
+        name: String,
+        api_key: String,
+        base_url: String,
+        extra_headers: HashMap<String, String>,
+        model_id: String,
+        temperature: Option<f32>,
+        max_tokens: Option<u32>,
+        model_extra: HashMap<String, serde_json::Value>,
+    ) -> Self {
+        Self {
+            client: Client::new(),
+            name,
+            api_key,
+            base_url,
+            extra_headers,
+            model_id,
+            temperature,
+            max_tokens,
+            model_extra,
+        }
+    }
+}
+
+#[derive(Deserialize)]
+struct OpenAIResponse {
+    id: String,
+    model: String,
+    choices: Vec<OpenAIChoice>,
+    #[serde(default)]
+    usage: OpenAIUsage,
+}
+
+#[derive(Deserialize)]
+struct OpenAIChoice {
+    message: OpenAIMessage,
+}
+
+#[derive(Deserialize)]
+struct OpenAIMessage {
+    #[serde(default)]
+    content: Option<String>,
+    #[serde(default)]
+    name: Option<String>,
+    #[serde(default)]
+    tool_calls: Vec<OpenAIToolCall>,
+}
+
+#[derive(Deserialize)]
+struct OpenAIToolCall {
+    id: String,
+    #[serde(rename = "function")]
+    function: OAIFunction,
+    #[serde(default)]
+    index: Option<u32>,
+}
+
+#[derive(Deserialize)]
+struct OAIFunction {
+    name: String,
+    arguments: String,
+}
+
+#[derive(Deserialize, Default)]
+struct OpenAIUsage {
+    #[serde(default)]
+    prompt_tokens: u32,
+    #[serde(default)]
+    completion_tokens: u32,
+    #[serde(default)]
+    total_tokens: u32,
+}
+
+#[async_trait]
+impl LLMProvider for OpenAIProvider {
+    async fn chat(
+        &self,
+        request: ChatCompletionRequest,
+    ) -> Result<ChatCompletionResponse, Box<dyn std::error::Error + Send + Sync>> {
+        let url = format!("{}/chat/completions", self.base_url);
+
+        let mut body = json!({
+            "model": self.model_id,
+            "messages": request.messages.iter().map(|m| {
+                json!({
+                    "role": m.role,
+                    "content": m.content
+                })
+            }).collect::<Vec<_>>(),
+            "temperature": request.temperature.or(self.temperature).unwrap_or(0.7),
+            "max_tokens": request.max_tokens.or(self.max_tokens),
+        });
+
+        // Add model extra fields
+        for (key, value) in &self.model_extra {
+            body[key] = value.clone();
+        }
+
+        if let Some(tools) = &request.tools {
+            body["tools"] = json!(tools);
+        }
+
+        let mut req_builder = self
+            .client
+            .post(&url)
+            .header("Authorization", format!("Bearer {}", self.api_key))
+            .header("Content-Type", "application/json");
+
+        for (key, value) in &self.extra_headers {
+            req_builder = req_builder.header(key.as_str(), value.as_str());
+        }
+
+        let resp = req_builder.json(&body).send().await?;
+
+        let openai_resp: OpenAIResponse = resp.json().await?;
+
+        let content = openai_resp.choices[0]
+            .message
+            .content
+            .as_ref()
+            .unwrap_or(&String::new())
+            .clone();
+
+        let tool_calls: Vec<ToolCall> = openai_resp.choices[0]
+            .message
+            .tool_calls
+            .iter()
+            .map(|tc| ToolCall {
+                id: tc.id.clone(),
+                name: tc.function.name.clone(),
+                arguments: serde_json::from_str(&tc.function.arguments).unwrap_or(serde_json::Value::Null),
+            })
+            .collect();
+
+        Ok(ChatCompletionResponse {
+            id: openai_resp.id,
+            model: openai_resp.model,
+            content,
+            tool_calls,
+            usage: Usage {
+                prompt_tokens: openai_resp.usage.prompt_tokens,
+                completion_tokens: openai_resp.usage.completion_tokens,
+                total_tokens: openai_resp.usage.total_tokens,
+            },
+        })
+    }
+
+    fn ptype(&self) -> &str {
+        "openai"
+    }
+
+    fn name(&self) -> &str {
+        &self.name
+    }
+
+    fn model_id(&self) -> &str {
+        &self.model_id
+    }
+}
diff --git a/src/providers/traits.rs b/src/providers/traits.rs
new file mode 100644
index 0000000..843aabb
--- /dev/null
+++ b/src/providers/traits.rs
@@ -0,0 +1,67 @@
+use async_trait::async_trait;
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Message {
+    pub role: String,
+    pub content: String,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Tool {
+    #[serde(rename = "type")]
+    pub tool_type: String,
+    pub function: ToolFunction,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ToolFunction {
+    pub name: String,
+    pub description: String,
+    pub parameters: serde_json::Value,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ToolCall {
+    pub id: String,
+    pub name: String,
+    pub arguments: serde_json::Value,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ChatCompletionRequest {
+    pub messages: Vec<Message>,
+    pub temperature: Option<f32>,
+    pub max_tokens: Option<u32>,
+    pub tools: Option<Vec<Tool>>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ChatCompletionResponse {
+    pub id: String,
+    pub model: String,
+    pub content: String,
+    pub tool_calls: Vec<ToolCall>,
+    pub usage: Usage,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Usage {
+    pub prompt_tokens: u32,
+    pub completion_tokens: u32,
+    pub total_tokens: u32,
+}
+
+#[async_trait]
+pub trait LLMProvider: Send + Sync {
+    async fn chat(
+        &self,
+        request: ChatCompletionRequest,
+    ) -> Result<ChatCompletionResponse, Box<dyn std::error::Error + Send + Sync>>;
+
+    fn ptype(&self) -> &str;
+
+    fn name(&self) -> &str;
+
+    fn model_id(&self) -> &str;
+}
diff --git a/tests/test.env.example b/tests/test.env.example
new file mode 100644
index 0000000..c132b97
--- /dev/null
+++ b/tests/test.env.example
@@ -0,0 +1,12 @@
+# Copy this file to test.env and fill in your API keys
+# cp tests/test.env.example tests/test.env
+
+# Anthropic Configuration
+ANTHROPIIC_BASE_URL=https://api.anthropic.com/v1
+ANTHROPIIC_API_KEY=your_anthropic_api_key_here
+ANTHROPIIC_MODEL_NAME=claude-3-5-sonnet-20241022
+
+# OpenAI Configuration
+OPENAI_BASE_URL=https://api.openai.com/v1
+OPENAI_API_KEY=your_openai_api_key_here
+OPENAI_MODEL_NAME=gpt-4
diff --git a/tests/test_integration.rs b/tests/test_integration.rs
new file mode 100644
index 0000000..aeb9e95
--- /dev/null
+++ b/tests/test_integration.rs
@@ -0,0 +1,94 @@
+use std::collections::HashMap;
+use PicoBot::providers::{create_provider, LLMProvider, ChatCompletionRequest, Message};
+use PicoBot::config::{Config, LLMProviderConfig};
+
+fn load_config() -> Option<LLMProviderConfig> {
+    dotenv::from_filename("tests/test.env").ok()?;
+
+    let openai_base_url = std::env::var("OPENAI_BASE_URL").ok()?;
+    let openai_api_key = std::env::var("OPENAI_API_KEY").ok()?;
+    let openai_model = std::env::var("OPENAI_MODEL_NAME").unwrap_or_else(|_| "gpt-4".to_string());
+
+    if openai_api_key.contains("your_") {
+        return None;
+    }
+
+    Some(LLMProviderConfig {
+        provider_type: "openai".to_string(),
+        name: "test_openai".to_string(),
+        base_url: openai_base_url,
+        api_key: openai_api_key,
+        extra_headers: HashMap::new(),
+        model_id: openai_model,
+        temperature: Some(0.0),
+        max_tokens: Some(100),
+        model_extra: HashMap::new(),
+    })
+}
+
+fn create_request(content: &str) -> ChatCompletionRequest {
+    ChatCompletionRequest {
+        messages: vec![Message {
+            role: "user".to_string(),
+            content: content.to_string(),
+        }],
+        temperature: Some(0.0),
+        max_tokens: Some(100),
+        tools: None,
+    }
+}
+
+#[tokio::test]
+#[ignore]
+async fn test_openai_simple_completion() {
+    let config = load_config()
+        .expect("Please configure tests/test.env with valid API keys");
+
+    let provider = create_provider(config).expect("Failed to create provider");
+    let response = provider.chat(create_request("Say 'ok'")).await.unwrap();
+
+    assert!(!response.id.is_empty());
+    assert!(!response.content.is_empty());
+    assert!(response.usage.total_tokens > 0);
+    assert!(response.content.to_lowercase().contains("ok"));
+}
+
+#[tokio::test]
+#[ignore]
+async fn test_openai_conversation() {
+    let config = load_config()
+        .expect("Please configure tests/test.env with valid API keys");
+
+    let provider = create_provider(config).expect("Failed to create provider");
+
+    let request = ChatCompletionRequest {
+        messages: vec![
+            Message { role: "user".to_string(), content: "My name is Alice".to_string() },
+            Message { role: "assistant".to_string(), content: "Hello Alice!".to_string() },
+            Message { role: "user".to_string(), content: "What is my name?".to_string() },
+        ],
+        temperature: Some(0.0),
+        max_tokens: Some(50),
+        tools: None,
+    };
+
+    let response = provider.chat(request).await.unwrap();
+    assert!(response.content.to_lowercase().contains("alice"));
+}
+
+#[tokio::test]
+#[ignore]
+async fn test_config_load() {
+    // Test that config.json can be loaded and provider config created
+    let config = Config::load("config.json").expect("Failed to load config.json");
+    let provider_config = config.get_provider_config("default").expect("Failed to get provider config");
+
+    assert_eq!(provider_config.provider_type, "openai");
+    assert_eq!(provider_config.name, "aliyun");
+    assert_eq!(provider_config.model_id, "qwen-plus");
+
+    let provider = create_provider(provider_config).expect("Failed to create provider");
+    assert_eq!(provider.ptype(), "openai");
+    assert_eq!(provider.name(), "aliyun");
+    assert_eq!(provider.model_id(), "qwen-plus");
+}
diff --git a/tests/test_request_format.rs b/tests/test_request_format.rs
new file mode 100644
index 0000000..58f34f4
--- /dev/null
+++ b/tests/test_request_format.rs
@@ -0,0 +1,65 @@
+use PicoBot::providers::{ChatCompletionRequest, Message};
+
+/// Test that message with special characters is properly escaped
+#[test]
+fn test_message_special_characters() {
+    let msg = Message {
+        role: "user".to_string(),
+        content: "Hello \"world\"\nNew line\tTab".to_string(),
+    };
+
+    let json = serde_json::to_string(&msg).unwrap();
+    let deserialized: Message = serde_json::from_str(&json).unwrap();
+
+    assert_eq!(deserialized.content, "Hello \"world\"\nNew line\tTab");
+}
+
+/// Test that multi-line system prompt is preserved
+#[test]
+fn test_multiline_system_prompt() {
+    let messages = vec![
+        Message {
+            role: "system".to_string(),
+            content: "You are a helpful assistant.\n\nFollow these rules:\n1. Be kind\n2. Be accurate".to_string(),
+        },
+        Message {
+            role: "user".to_string(),
+            content: "Hi".to_string(),
+        },
+    ];
+
+    let json = serde_json::to_string(&messages[0]).unwrap();
+    assert!(json.contains("helpful assistant"));
+    assert!(json.contains("rules"));
+    assert!(json.contains("1. Be kind"));
+}
+
+/// Test ChatCompletionRequest serialization (without model field)
+#[test]
+fn test_chat_request_serialization() {
+    let request = ChatCompletionRequest {
+        messages: vec![
+            Message {
+                role: "system".to_string(),
+                content: "You are helpful".to_string(),
+            },
+            Message {
+                role: "user".to_string(),
+                content: "Hello".to_string(),
+            },
+        ],
+        temperature: Some(0.7),
+        max_tokens: Some(100),
+        tools: None,
+    };
+
+    let json = serde_json::to_string(&request).unwrap();
+
+    // Verify structure
+    assert!(json.contains(r#""role":"system""#));
+    assert!(json.contains(r#""role":"user""#));
+    assert!(json.contains(r#""content":"You are helpful""#));
+    assert!(json.contains(r#""content":"Hello""#));
+    assert!(json.contains(r#""temperature":0.7"#));
+    assert!(json.contains(r#""max_tokens":100"#));
+}
diff --git a/tests/test_tool_calling.rs b/tests/test_tool_calling.rs
new file mode 100644
index 0000000..c96ba60
--- /dev/null
+++ b/tests/test_tool_calling.rs
@@ -0,0 +1,147 @@
+use std::collections::HashMap;
+use PicoBot::providers::{create_provider, ChatCompletionRequest, Message, Tool, ToolFunction};
+use PicoBot::config::LLMProviderConfig;
+
+fn load_openai_config() -> Option<LLMProviderConfig> {
+    dotenv::from_filename("tests/test.env").ok()?;
+
+    let openai_base_url = std::env::var("OPENAI_BASE_URL").ok()?;
+    let openai_api_key = std::env::var("OPENAI_API_KEY").ok()?;
+    let openai_model = std::env::var("OPENAI_MODEL_NAME").unwrap_or_else(|_| "gpt-4".to_string());
+
+    if openai_api_key.contains("your_") {
+        return None;
+    }
+
+    Some(LLMProviderConfig {
+        provider_type: "openai".to_string(),
+        name: "test_openai".to_string(),
+        base_url: openai_base_url,
+        api_key: openai_api_key,
+        extra_headers: HashMap::new(),
+        model_id: openai_model,
+        temperature: Some(0.0),
+        max_tokens: Some(100),
+        model_extra: HashMap::new(),
+    })
+}
+
+fn make_weather_tool() -> Tool {
+    Tool {
+        tool_type: "function".to_string(),
+        function: ToolFunction {
+            name: "get_weather".to_string(),
+            description: "Get current weather for a city".to_string(),
+            parameters: serde_json::json!({
+                "type": "object",
+                "properties": {
+                    "city": {
+                        "type": "string",
+                        "description": "The city name"
+                    }
+                },
+                "required": ["city"]
+            }),
+        },
+    }
+}
+
+#[tokio::test]
+#[ignore]
+async fn test_openai_tool_call() {
+    let config = load_openai_config()
+        .expect("Please configure tests/test.env with valid API keys");
+
+    let provider = create_provider(config).expect("Failed to create provider");
+
+    let request = ChatCompletionRequest {
+        messages: vec![Message {
+            role: "user".to_string(),
+            content: "What is the weather in Tokyo?".to_string(),
+        }],
+        temperature: Some(0.0),
+        max_tokens: Some(200),
+        tools: Some(vec![make_weather_tool()]),
+    };
+
+    let response = provider.chat(request).await.unwrap();
+
+    // Should have tool calls
+    assert!(!response.tool_calls.is_empty(), "Expected tool call, got: {}", response.content);
+
+    let tool_call = &response.tool_calls[0];
+    assert_eq!(tool_call.name, "get_weather");
+    assert!(tool_call.arguments.get("city").is_some());
+}
+
+#[tokio::test]
+#[ignore]
+async fn test_openai_tool_call_with_manual_execution() {
+    let config = load_openai_config()
+        .expect("Please configure tests/test.env with valid API keys");
+
+    let provider = create_provider(config).expect("Failed to create provider");
+
+    // First request with tool
+    let request1 = ChatCompletionRequest {
+        messages: vec![Message {
+            role: "user".to_string(),
+            content: "What is the weather in Tokyo?".to_string(),
+        }],
+        temperature: Some(0.0),
+        max_tokens: Some(200),
+        tools: Some(vec![make_weather_tool()]),
+    };
+
+    let response1 = provider.chat(request1).await.unwrap();
+    let tool_call = response1.tool_calls.first()
+        .expect("Expected tool call");
+    assert_eq!(tool_call.name, "get_weather");
+
+    // Second request with tool result
+    let request2 = ChatCompletionRequest {
+        messages: vec![
+            Message {
+                role: "user".to_string(),
+                content: "What is the weather in Tokyo?".to_string(),
+            },
+            Message {
+                role: "assistant".to_string(),
+                content: r#"I'll check the weather for you using the get_weather tool."#.to_string(),
+            },
+        ],
+        temperature: Some(0.0),
+        max_tokens: Some(200),
+        tools: Some(vec![make_weather_tool()]),
+    };
+
+    let response2 = provider.chat(request2).await.unwrap();
+
+    // Should have a response
+    assert!(!response2.content.is_empty() || !response2.tool_calls.is_empty());
+}
+
+#[tokio::test]
+#[ignore]
+async fn test_openai_no_tool_when_not_provided() {
+    let config = load_openai_config()
+        .expect("Please configure tests/test.env with valid API keys");
+
+    let provider = create_provider(config).expect("Failed to create provider");
+
+    let request = ChatCompletionRequest {
+        messages: vec![Message {
+            role: "user".to_string(),
+            content: "Say hello in one word.".to_string(),
+        }],
+        temperature: Some(0.0),
+        max_tokens: Some(10),
+        tools: None,
+    };
+
+    let response = provider.chat(request).await.unwrap();
+
+    // Should NOT have tool calls
+    assert!(response.tool_calls.is_empty());
+    assert!(!response.content.is_empty());
+}