rsclaw 2026.4.20

AI Agent Engine Compatible with OpenClaw
Documentation 
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//! Google A2A Protocol v0.3 types and client.
//!
//! Spec: https://a2a-protocol.org/latest/specification/

pub mod client;
pub mod server;

use serde::{Deserialize, Serialize};
use serde_json::Value;

// ---------------------------------------------------------------------------
// JSON-RPC 2.0 envelope
// ---------------------------------------------------------------------------

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct JsonRpcRequest {
    pub jsonrpc: String,
    pub id: Value,
    pub method: String,
    pub params: Value,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct JsonRpcResponse {
    pub jsonrpc: String,
    pub id: Value,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub result: Option<Value>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub error: Option<JsonRpcError>,
}

impl JsonRpcResponse {
    pub fn ok(id: Value, result: Value) -> Self {
        Self {
            jsonrpc: "2.0".to_owned(),
            id,
            result: Some(result),
            error: None,
        }
    }
    pub fn err(id: Value, code: i32, message: impl Into<String>) -> Self {
        Self {
            jsonrpc: "2.0".to_owned(),
            id,
            result: None,
            error: Some(JsonRpcError {
                code,
                message: message.into(),
                data: None,
            }),
        }
    }
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct JsonRpcError {
    pub code: i32,
    pub message: String,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub data: Option<Value>,
}

// ---------------------------------------------------------------------------
// Agent Card  (GET /.well-known/agent.json)
// ---------------------------------------------------------------------------

#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct AgentCard {
    pub protocol_version: String,
    pub name: String,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub description: Option<String>,
    /// Base URL where this gateway's A2A endpoint lives.
    pub url: String,
    pub capabilities: AgentCapabilities,
    pub default_input_modes: Vec<String>,
    pub default_output_modes: Vec<String>,
    pub skills: Vec<AgentSkill>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct AgentCapabilities {
    pub streaming: bool,
    pub push_notifications: bool,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct AgentSkill {
    pub id: String,
    pub name: String,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub description: Option<String>,
    pub input_modes: Vec<String>,
    pub output_modes: Vec<String>,
}

// ---------------------------------------------------------------------------
// Task (A2A work unit)
// ---------------------------------------------------------------------------

#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct A2aTask {
    pub id: String,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub session_id: Option<String>,
    pub status: A2aTaskStatus,
    pub message: A2aMessage,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub artifacts: Option<Vec<A2aArtifact>>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub metadata: Option<Value>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct A2aTaskStatus {
    pub state: TaskState,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub message: Option<A2aMessage>,
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
#[serde(rename_all = "lowercase")]
pub enum TaskState {
    Submitted,
    Working,
    Completed,
    Failed,
    Canceled,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct A2aMessage {
    pub role: String, // "user" | "agent"
    pub parts: Vec<A2aPart>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(tag = "type", rename_all = "lowercase")]
pub enum A2aPart {
    Text { text: String },
    Data { data: Value },
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct A2aArtifact {
    pub parts: Vec<A2aPart>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub index: Option<u32>,
}

// ---------------------------------------------------------------------------
// tasks/send params
// ---------------------------------------------------------------------------

#[derive(Debug, Clone, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct TaskSendParams {
    pub id: String,
    pub message: A2aMessage,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub session_id: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub metadata: Option<Value>,
}