merlion-core 0.1.3

Core message, tool, and agent-loop types for Merlion Agent
Documentation 
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use serde::{Deserialize, Serialize};

#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "lowercase")]
pub enum Role {
    System,
    User,
    Assistant,
    Tool,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ToolCall {
    pub id: String,
    pub name: String,
    /// Raw JSON arguments as the model emitted them.
    pub arguments: serde_json::Value,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ToolResult {
    pub tool_call_id: String,
    pub name: String,
    pub content: String,
    #[serde(default)]
    pub is_error: bool,
}

/// One turn in the conversation.
///
/// Models the OpenAI chat-completion shape closely so that mapping to the wire
/// format is mechanical: an assistant turn may carry `content` and/or
/// `tool_calls`; tool turns carry `tool_call_id` + content.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Message {
    pub role: Role,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub content: Option<String>,
    #[serde(default, skip_serializing_if = "Vec::is_empty")]
    pub tool_calls: Vec<ToolCall>,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub tool_call_id: Option<String>,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub name: Option<String>,
}

impl Message {
    pub fn system(text: impl Into<String>) -> Self {
        Self {
            role: Role::System,
            content: Some(text.into()),
            tool_calls: Vec::new(),
            tool_call_id: None,
            name: None,
        }
    }

    pub fn user(text: impl Into<String>) -> Self {
        Self {
            role: Role::User,
            content: Some(text.into()),
            tool_calls: Vec::new(),
            tool_call_id: None,
            name: None,
        }
    }

    pub fn assistant_text(text: impl Into<String>) -> Self {
        Self {
            role: Role::Assistant,
            content: Some(text.into()),
            tool_calls: Vec::new(),
            tool_call_id: None,
            name: None,
        }
    }

    pub fn assistant_tool_calls(calls: Vec<ToolCall>) -> Self {
        Self {
            role: Role::Assistant,
            content: None,
            tool_calls: calls,
            tool_call_id: None,
            name: None,
        }
    }

    pub fn tool_response(result: ToolResult) -> Self {
        Self {
            role: Role::Tool,
            content: Some(result.content),
            tool_calls: Vec::new(),
            tool_call_id: Some(result.tool_call_id),
            name: Some(result.name),
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn assistant_with_tool_calls_serializes_without_content() {
        let m = Message::assistant_tool_calls(vec![ToolCall {
            id: "call_1".into(),
            name: "bash".into(),
            arguments: serde_json::json!({"cmd": "ls"}),
        }]);
        let v = serde_json::to_value(&m).unwrap();
        assert_eq!(v["role"], "assistant");
        assert!(v.get("content").is_none(), "content should be omitted");
        assert_eq!(v["tool_calls"][0]["name"], "bash");
    }
}