agent-base 0.1.0

A lightweight Agent Runtime Kernel for building AI agents in Rust
Documentation 
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use serde::{Deserialize, Serialize};

#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
pub enum MessageRole {
    System,
    User,
    Assistant,
    Tool,
}

impl MessageRole {
    pub fn as_str(&self) -> &'static str {
        match self {
            MessageRole::System => "system",
            MessageRole::User => "user",
            MessageRole::Assistant => "assistant",
            MessageRole::Tool => "tool",
        }
    }

    pub fn as_api_role(&self) -> &'static str {
        self.as_str()
    }
}

#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct Message {
    pub role: MessageRole,
    pub content: String,
}

#[derive(Clone, Debug, Serialize, Deserialize)]
pub enum ChatMessage {
    System {
        content: String,
    },
    User {
        content: String,
        #[serde(default, skip_serializing_if = "Vec::is_empty")]
        images: Vec<ImageAttachment>,
    },
    Assistant {
        content: Option<String>,
        reasoning_content: Option<String>,
        tool_calls: Option<Vec<ToolCallMessage>>,
    },
    Tool {
        tool_call_id: String,
        content: String,
    },
}

#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct ToolCallMessage {
    pub id: String,
    pub name: String,
    pub arguments: String,
}

#[derive(Clone, Debug, Serialize, Deserialize)]
pub enum ImageAttachment {
    Url {
        url: String,
        #[serde(default, skip_serializing_if = "Option::is_none")]
        detail: Option<ImageDetail>,
    },
    Base64 {
        data: String,
        #[serde(default, skip_serializing_if = "Option::is_none")]
        media_type: Option<String>,
        #[serde(default, skip_serializing_if = "Option::is_none")]
        detail: Option<ImageDetail>,
    },
}

#[derive(Clone, Debug, Serialize, Deserialize)]
pub enum ImageDetail {
    Low,
    High,
    Auto,
}

impl ChatMessage {
    pub fn system(content: impl Into<String>) -> Self {
        Self::System {
            content: content.into(),
        }
    }

    pub fn user(content: impl Into<String>) -> Self {
        Self::User {
            content: content.into(),
            images: Vec::new(),
        }
    }

    pub fn user_with_images(content: impl Into<String>, images: Vec<ImageAttachment>) -> Self {
        Self::User {
            content: content.into(),
            images,
        }
    }

    pub fn assistant(content: impl Into<String>) -> Self {
        Self::Assistant {
            content: Some(content.into()),
            reasoning_content: None,
            tool_calls: None,
        }
    }

    pub fn assistant_with_reasoning(
        content: impl Into<String>,
        reasoning: impl Into<String>,
    ) -> Self {
        Self::Assistant {
            content: Some(content.into()),
            reasoning_content: Some(reasoning.into()),
            tool_calls: None,
        }
    }

    pub fn assistant_tool_call(tool_call_id: impl Into<String>, tool_name: impl Into<String>, arguments: impl Into<String>) -> Self {
        Self::Assistant {
            content: None,
            reasoning_content: None,
            tool_calls: Some(vec![ToolCallMessage {
                id: tool_call_id.into(),
                name: tool_name.into(),
                arguments: arguments.into(),
            }]),
        }
    }

    pub fn tool(tool_call_id: impl Into<String>, content: impl Into<String>) -> Self {
        Self::Tool {
            tool_call_id: tool_call_id.into(),
            content: content.into(),
        }
    }
}