sayr-engine 0.3.0

A high-performance Rust AI agent runtime inspired by the Agno framework
Documentation 
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use serde::{Deserialize, Serialize};

/// A non-textual payload that can accompany a message.
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
pub struct Attachment {
    pub kind: AttachmentKind,
    pub uri: String,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub description: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub media_type: Option<String>,
}

/// Types of attachments supported by the runtime.
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
pub enum AttachmentKind {
    File,
    Image,
    Audio,
    Video,
    Other,
}

/// Chat roles supported by the runtime.
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq, Eq)]
pub enum Role {
    System,
    User,
    Assistant,
    Tool,
}

/// A tool call generated by the language model.
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
pub struct ToolCall {
    #[serde(skip_serializing_if = "Option::is_none")]
    pub id: Option<String>,
    pub name: String,
    pub arguments: serde_json::Value,
}

/// A tool result message captured in the transcript.
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
pub struct ToolResult {
    pub name: String,
    pub output: serde_json::Value,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub tool_call_id: Option<String>,
}

/// A single message in the conversation transcript.
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
pub struct Message {
    pub role: Role,
    pub content: String,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub tool_call: Option<ToolCall>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub tool_result: Option<ToolResult>,
    #[serde(skip_serializing_if = "Vec::is_empty", default)]
    pub attachments: Vec<Attachment>,
}

impl Message {
    pub fn system(content: impl Into<String>) -> Self {
        Self {
            role: Role::System,
            content: content.into(),
            tool_call: None,
            tool_result: None,
            attachments: Vec::new(),
        }
    }

    pub fn user(content: impl Into<String>) -> Self {
        Self {
            role: Role::User,
            content: content.into(),
            tool_call: None,
            tool_result: None,
            attachments: Vec::new(),
        }
    }

    pub fn assistant(content: impl Into<String>) -> Self {
        Self {
            role: Role::Assistant,
            content: content.into(),
            tool_call: None,
            tool_result: None,
            attachments: Vec::new(),
        }
    }

    pub fn tool(name: impl Into<String>, output: serde_json::Value) -> Self {
        let name = name.into();

        Self {
            role: Role::Tool,
            content: format!("Result from `{}`", name),
            tool_call: None,
            tool_result: Some(ToolResult {
                name: name.clone(),
                output,
                tool_call_id: None,
            }),
            attachments: Vec::new(),
        }
    }

    pub fn tool_with_call(
        name: impl Into<String>,
        output: serde_json::Value,
        tool_call_id: Option<String>,
    ) -> Self {
        let name = name.into();

        Self {
            role: Role::Tool,
            content: format!("Result from `{}`", name),
            tool_call: None,
            tool_result: Some(ToolResult {
                name: name.clone(),
                output,
                tool_call_id,
            }),
            attachments: Vec::new(),
        }
    }
}