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/**
* Agent-to-Agent (A2A) Protocol Type Definitions
*
* Comprehensive types for A2A communication based on JSON-RPC 2.0
* with extensions for agent discovery, capability matching, and workflow coordination
*/
// JSON-RPC 2.0 Base Types
export interface JsonRpcRequest {
jsonrpc: '2.0';
method: string;
params?: object | any[];
id?: string | number | null;
}
export interface JsonRpcResponse {
jsonrpc: '2.0';
result?: any;
error?: JsonRpcError;
id: string | number | null;
}
export interface JsonRpcError {
code: number;
message: string;
data?: any;
}
export interface JsonRpcNotification {
jsonrpc: '2.0';
method: string;
params?: object | any[];
}
// A2A Protocol Extensions
export interface A2AMessage extends JsonRpcRequest {
// Agent identification
from: AgentId;
to: AgentId | AgentId[] | 'broadcast';
// Message routing
route?: MessageRoute;
priority?: MessagePriority;
// Security and authentication
signature?: string;
timestamp: number;
nonce?: string;
// Message metadata
messageType: A2AMessageType;
capabilities?: AgentCapability[];
context?: MessageContext;
}
export interface A2AResponse extends JsonRpcResponse {
from: AgentId;
to: AgentId;
timestamp: number;
messageType: 'response';
}
export interface A2ANotification extends JsonRpcNotification {
from: AgentId;
to: AgentId | AgentId[] | 'broadcast';
timestamp: number;
messageType: 'notification';
}
// Agent Types
export type AgentId = string;
export interface AgentCard {
id: AgentId;
name: string;
description: string;
version: string;
// Capabilities and services
capabilities: AgentCapability[];
services: AgentService[];
// Communication endpoints
endpoints: AgentEndpoint[];
// Metadata
metadata: {
type: AgentType;
status: AgentStatus;
load: number; // 0-1 scale
created: number;
lastSeen: number;
// Performance metrics
metrics?: AgentMetrics;
// Security credentials
publicKey?: string;
trustLevel?: TrustLevel;
};
}
export interface AgentCapability {
name: string;
version: string;
description: string;
parameters?: CapabilityParameter[];
// Resource requirements
resources?: ResourceRequirements;
// Compatibility
dependencies?: string[];
conflicts?: string[];
}
export interface AgentService {
name: string;
method: string;
description: string;
// JSON-RPC schema
params?: ServiceParameter[];
returns?: ServiceReturn;
// Service metadata
cost?: number; // Resource cost estimate
latency?: number; // Expected latency in ms
reliability?: number; // 0-1 reliability score
}
export interface AgentEndpoint {
protocol: TransportProtocol;
address: string;
port?: number;
path?: string;
secure?: boolean;
// Connection metadata
maxConnections?: number;
capabilities?: string[];
}
// Message Types and Routing
export type A2AMessageType =
| 'request'
| 'response'
| 'notification'
| 'discovery'
| 'registration'
| 'heartbeat'
| 'capability_query'
| 'workflow_coordination'
| 'resource_negotiation'
| 'security_handshake';
export type MessagePriority = 'low' | 'normal' | 'high' | 'critical';
export interface MessageRoute {
path: AgentId[];
hops: number;
maxHops?: number;
strategy?: RoutingStrategy;
}
export type RoutingStrategy =
| 'direct'
| 'shortest_path'
| 'load_balanced'
| 'capability_aware'
| 'cost_optimized';
export interface MessageContext {
workflowId?: string;
sessionId?: string;
correlationId?: string;
parentMessageId?: string;
// Execution context
timeout?: number;
retryPolicy?: RetryPolicy;
// Resource constraints
maxCost?: number;
preferredLatency?: number;
}
// Transport Layer Types
export type TransportProtocol = 'websocket' | 'http' | 'grpc' | 'tcp' | 'ipc';
export interface TransportConfig {
protocol: TransportProtocol;
host?: string;
port?: number;
path?: string;
secure?: boolean;
// Connection options
timeout?: number;
keepAlive?: boolean;
compression?: boolean;
// Security options
tls?: TLSConfig;
auth?: AuthConfig;
}
export interface TLSConfig {
cert?: string;
key?: string;
ca?: string;
rejectUnauthorized?: boolean;
}
export interface AuthConfig {
type: 'none' | 'token' | 'certificate' | 'oauth2';
credentials?: any;
}
// Agent Classification
export type AgentType =
| 'coordinator'
| 'researcher'
| 'coder'
| 'analyst'
| 'architect'
| 'tester'
| 'reviewer'
| 'optimizer'
| 'documenter'
| 'monitor'
| 'specialist'
| 'bridge'
| 'proxy';
export type AgentStatus =
| 'initializing'
| 'idle'
| 'busy'
| 'overloaded'
| 'maintenance'
| 'offline'
| 'error';
export type TrustLevel = 'untrusted' | 'basic' | 'verified' | 'trusted' | 'critical';
// Performance and Resources
export interface AgentMetrics {
// Performance metrics
responseTime: {
avg: number;
p50: number;
p95: number;
p99: number;
};
// Throughput metrics
requestsPerSecond: number;
messagesProcessed: number;
// Resource usage
cpuUsage: number; // 0-1 scale
memoryUsage: number; // 0-1 scale
networkUsage: number; // bytes/sec
// Reliability metrics
successRate: number; // 0-1 scale
errorRate: number; // 0-1 scale
uptime: number; // percentage
}
export interface ResourceRequirements {
cpu?: number; // CPU cores required
memory?: number; // Memory in MB
network?: number; // Network bandwidth in Mbps
storage?: number; // Storage in MB
// Special requirements
gpu?: boolean;
specialized?: string[];
}
// Error Handling and Retry
export interface RetryPolicy {
maxAttempts: number;
backoffStrategy: 'linear' | 'exponential' | 'fixed';
baseDelay: number; // milliseconds
maxDelay: number; // milliseconds
jitter?: boolean;
}
export interface A2AError extends JsonRpcError {
// Extended error information
type: A2AErrorType;
source: AgentId;
context?: any;
retryable?: boolean;
troubleshooting?: string[];
}
export type A2AErrorType =
| 'protocol_error'
| 'authentication_error'
| 'authorization_error'
| 'capability_not_found'
| 'agent_unavailable'
| 'resource_exhausted'
| 'timeout_error'
| 'routing_error'
| 'serialization_error'
| 'validation_error'
| 'internal_error';
// Discovery and Registration
export interface DiscoveryRequest extends A2AMessage {
method: 'agent.discover';
params: {
capabilities?: string[];
agentType?: AgentType;
maxDistance?: number;
filters?: DiscoveryFilter[];
};
}
export interface DiscoveryResponse extends A2AResponse {
result: {
agents: AgentCard[];
totalFound: number;
searchTime: number;
};
}
export interface DiscoveryFilter {
field: string;
operator: 'eq' | 'ne' | 'gt' | 'lt' | 'gte' | 'lte' | 'in' | 'contains';
value: any;
}
export interface RegistrationRequest extends A2AMessage {
method: 'agent.register';
params: {
agentCard: AgentCard;
ttl?: number; // Time to live in seconds
};
}
export interface RegistrationResponse extends A2AResponse {
result: {
registered: boolean;
agentId: AgentId;
expiresAt: number;
};
}
// Workflow Coordination
export interface WorkflowCoordinationRequest extends A2AMessage {
method: 'workflow.coordinate';
params: {
workflowId: string;
step: WorkflowStep;
dependencies?: string[];
data?: any;
};
}
export interface WorkflowStep {
id: string;
name: string;
type: 'sequential' | 'parallel' | 'conditional' | 'loop';
capabilities: string[];
// Execution parameters
timeout?: number;
retries?: number;
condition?: string; // For conditional steps
// Data flow
inputs?: WorkflowInput[];
outputs?: WorkflowOutput[];
}
export interface WorkflowInput {
name: string;
type: string;
required: boolean;
source?: string; // Source step id
}
export interface WorkflowOutput {
name: string;
type: string;
destination?: string; // Destination step id
}
// MCP Bridge Types
export interface MCPToA2AMapping {
mcpMethod: string;
a2aMethod: string;
parameterMapping: ParameterMapping[];
responseMapping: ResponseMapping[];
}
export interface ParameterMapping {
mcpParam: string;
a2aParam: string;
transform?: TransformFunction;
}
export interface ResponseMapping {
mcpField: string;
a2aField: string;
transform?: TransformFunction;
}
export type TransformFunction = (value: any, context?: any) => any;
// Service Parameter Types
export interface ServiceParameter {
name: string;
type: 'string' | 'number' | 'boolean' | 'object' | 'array';
required: boolean;
description?: string;
schema?: any; // JSON Schema
}
export interface ServiceReturn {
type: 'string' | 'number' | 'boolean' | 'object' | 'array' | 'void';
description?: string;
schema?: any; // JSON Schema
}
export interface CapabilityParameter {
name: string;
type: string;
required: boolean;
default?: any;
description?: string;
}
// Protocol Manager Configuration
export interface A2AProtocolConfig {
// Agent identification
agentId: AgentId;
agentCard: AgentCard;
// Transport configuration
transports: TransportConfig[];
defaultTransport: TransportProtocol;
// Routing configuration
routingStrategy: RoutingStrategy;
maxHops: number;
// Discovery configuration
discoveryEnabled: boolean;
discoveryInterval: number; // milliseconds
// Security configuration
securityEnabled: boolean;
trustedAgents?: AgentId[];
// Performance configuration
messageTimeout: number;
maxConcurrentMessages: number;
retryPolicy: RetryPolicy;
}