agentic-workflow-mcp 0.1.0

MCP server for AgenticWorkflow — universal LLM access to workflow orchestration
Documentation 
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use serde::{Deserialize, Serialize};

/// MCP JSON-RPC request.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct JsonRpcRequest {
    pub jsonrpc: String,
    pub id: Option<serde_json::Value>,
    pub method: String,
    #[serde(default)]
    pub params: serde_json::Value,
}

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

/// MCP JSON-RPC error.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct JsonRpcError {
    pub code: i32,
    pub message: String,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub data: Option<serde_json::Value>,
}

/// MCP tool definition.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ToolDefinition {
    pub name: String,
    pub description: String,
    #[serde(rename = "inputSchema")]
    pub input_schema: serde_json::Value,
}

/// MCP tool call result.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ToolResult {
    pub content: Vec<ToolContent>,
    #[serde(rename = "isError", skip_serializing_if = "Option::is_none")]
    pub is_error: Option<bool>,
}

/// Content in a tool result.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ToolContent {
    #[serde(rename = "type")]
    pub content_type: String,
    pub text: String,
}

impl ToolResult {
    pub fn text(text: impl Into<String>) -> Self {
        Self {
            content: vec![ToolContent {
                content_type: "text".to_string(),
                text: text.into(),
            }],
            is_error: None,
        }
    }

    pub fn error(text: impl Into<String>) -> Self {
        Self {
            content: vec![ToolContent {
                content_type: "text".to_string(),
                text: text.into(),
            }],
            is_error: Some(true),
        }
    }

    pub fn json(value: &serde_json::Value) -> Self {
        Self::text(serde_json::to_string_pretty(value).unwrap_or_default())
    }
}

/// Error codes per MCP Quality Standard.
pub const TOOL_NOT_FOUND: i32 = -32803;
pub const PARSE_ERROR: i32 = -32700;
pub const INVALID_REQUEST: i32 = -32600;
pub const METHOD_NOT_FOUND: i32 = -32601;
pub const INVALID_PARAMS: i32 = -32602;
pub const INTERNAL_ERROR: i32 = -32603;

/// Server capabilities.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ServerCapabilities {
    pub tools: Option<serde_json::Value>,
    pub resources: Option<serde_json::Value>,
    pub prompts: Option<serde_json::Value>,
}

impl Default for ServerCapabilities {
    fn default() -> Self {
        Self {
            tools: Some(serde_json::json!({})),
            resources: Some(serde_json::json!({})),
            prompts: Some(serde_json::json!({})),
        }
    }
}