vage

A Go framework for building LLM-based intelligent agent systems.

Features

• Composable Agents — TaskAgent (ReAct tool-calling), RouterAgent (routing), WorkflowAgent (DAG orchestration), and CustomAgent (user-defined)
• DAG Orchestration — Parallel execution, loops, conditionals, compensation (Saga), checkpointing, backpressure, priority scheduling
• Three-Level Memory — Working (request) → Session (conversation) → Store (persistent), with context compression and token budgets
• Security Guardrails — Prompt injection, content filter, PII, topic, length, and custom guards
• LLM Middleware — Decorator chain: logging, circuit breaker, rate limiting, retry, timeout, cache, metrics
• Tool System — Local functions, MCP remote tools, agent-as-tool, built-in bash tool with process isolation
• Agent Skills — Compatible with the Agent Skills open standard
• MCP Protocol — Client (consume external tools) and server (expose agent capabilities)
• Evaluation — ExactMatch, Contains, LLMJudge, ToolCall, Latency, Cost evaluators
• HTTP Service — REST endpoints for sync, streaming, and async agent execution

Installation

go get github.com/vogo/vage

Quick Start

package main

import (
	"context"
	"fmt"

	"github.com/vogo/vage/agent"
	"github.com/vogo/vage/schema"
)

func main() {
	a := agent.New("greeter", "Greeter", "A simple greeting agent",
		func(ctx context.Context, req *schema.RunRequest) (*schema.RunResponse, error) {
			return schema.TextRunResponse("Hello! How can I help you?"), nil
		},
	)

	resp, err := agent.RunText(context.Background(), a, "Hi")
	if err != nil {
		panic(err)
	}
	fmt.Println(resp)
}

License

Apache License 2.0 — see LICENSE.