agent-code 0.2.1

An AI-powered coding agent for the terminal, written in pure Rust
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//! MCP protocol types.

use serde::{Deserialize, Serialize};

/// Configuration for an MCP server connection.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct McpServerConfig {
    /// Transport type.
    pub transport: McpTransport,
    /// Human-readable server name.
    pub name: String,
    /// Optional environment variables to set for the server process.
    #[serde(default)]
    pub env: std::collections::HashMap<String, String>,
}

/// Transport configuration for connecting to an MCP server.
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(tag = "type")]
pub enum McpTransport {
    /// Subprocess communicating via stdin/stdout.
    #[serde(rename = "stdio")]
    Stdio {
        command: String,
        #[serde(default)]
        args: Vec<String>,
    },
    /// HTTP server with Server-Sent Events.
    #[serde(rename = "sse")]
    Sse { url: String },
}

/// A tool exposed by an MCP server.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct McpTool {
    /// Tool name (may be prefixed with server name).
    pub name: String,
    /// Human-readable description.
    pub description: Option<String>,
    /// JSON Schema for the tool's input.
    #[serde(rename = "inputSchema")]
    pub input_schema: serde_json::Value,
}

/// A resource exposed by an MCP server.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct McpResource {
    pub uri: String,
    pub name: Option<String>,
    pub description: Option<String>,
    #[serde(rename = "mimeType")]
    pub mime_type: Option<String>,
}

/// Result from calling an MCP tool.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct McpToolResult {
    pub content: Vec<McpContent>,
    #[serde(rename = "isError", default)]
    pub is_error: bool,
}

/// Content block in an MCP response.
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(tag = "type")]
pub enum McpContent {
    #[serde(rename = "text")]
    Text { text: String },
    #[serde(rename = "image")]
    Image {
        data: String,
        #[serde(rename = "mimeType")]
        mime_type: String,
    },
    #[serde(rename = "resource")]
    Resource { resource: McpResource },
}

/// JSON-RPC 2.0 request.
#[derive(Debug, Serialize)]
pub struct JsonRpcRequest {
    pub jsonrpc: &'static str,
    pub id: u64,
    pub method: String,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub params: Option<serde_json::Value>,
}

impl JsonRpcRequest {
    pub fn new(id: u64, method: &str, params: Option<serde_json::Value>) -> Self {
        Self {
            jsonrpc: "2.0",
            id,
            method: method.to_string(),
            params,
        }
    }
}

/// JSON-RPC 2.0 response.
#[derive(Debug, Deserialize)]
pub struct JsonRpcResponse {
    pub id: Option<u64>,
    pub result: Option<serde_json::Value>,
    pub error: Option<JsonRpcError>,
}

/// JSON-RPC 2.0 error.
#[derive(Debug, Deserialize)]
pub struct JsonRpcError {
    pub code: i64,
    pub message: String,
    pub data: Option<serde_json::Value>,
}

/// Connection status of an MCP server.
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum McpConnectionStatus {
    Connecting,
    Connected,
    Disconnected,
    Error(String),
}