AI AGENT ENGINEERING PLATFORM

# Build, run, and observe production AI agents — without the framework tax.

An open-source, TypeScript-native framework for building durable AI agents. Composable tools, typed memory, full observability — all in one SDK.

Start building → Read the docs
$ npx create-voltagent-app@latest my-agent

###### AGENTS

⚡ support-triage
▸ doc-writer
▸ research-loop
▸ code-reviewer

###### TOOLS

⌥search_kb
⌥create_ticket
⌥send_email
support-triage · gpt-4o · v0.18 LIVE
U
Customer says order #4821 hasn't arrived. Can you check and refund if it's lost?
⚡
Looking up order #4821 — last scan was 6 days ago in transit. I'll mark it lost and issue a refund.
tool → search_kb("order=4821") · 142ms ✓ 200
tool → create_ticket(type="refund", amount=42.90) · 89ms ✓ 200
17k+ ★ on GitHub 240+ integrations 1.2M weekly downloads Apache 2.0
EVERYTHING YOU NEED

## The agent runtime, made boring.

Voltagent gives you typed primitives for the four hard parts of agent engineering — tools, memory, control-flow, and observability — without locking you into a vendor.

### Typed tools.

Define tool schemas in TypeScript. Zod-validated inputs, typed outputs, automatic retry semantics.

core@voltagent/core

### Durable memory.

Long-term store with vector + SQL semantics. Sessions, threads, and replayable state — no Redis to babysit.

@voltagent/memory

### Observable by default.

Every tool call, prompt, and decision lands in a trace tree. Diff agent versions across runs.

@voltagent/trace

### Composable control-flow.

Sequential, parallel, and loop primitives. Branch on tool output without writing custom orchestration.

graph()

### Model-agnostic.

OpenAI, Anthropic, Google, local Ollama — swap providers in one line. Token accounting included.

@voltagent/ai

### Production safe.

Rate limits, cost budgets, prompt-injection guards, audit logging — every concern your security team will ask.

@voltagent/guard
FIVE-LINE AGENT

### Define an agent. Hand it tools. Run it.

No decorators. No magic. The agent is a plain TypeScript value — composable, testable, deployable.

- Define tools with Zod schemas — validated at runtime.
- Pick any model: OpenAI, Anthropic, local Ollama.
- Trace every step automatically — no instrumentation.

Read the quickstart →
agent.ts

    import { defineAgent, tool } from "@voltagent/core";
    import { z } from "zod";

    const searchKb = tool({
      name: "search_kb",
      input: z.object({ query: z.string() }),
      run: async ({ query }) => kb.search(query),
    });

    export const support = defineAgent({
      model: "gpt-4o",
      tools: [searchKb],
      system: "You triage customer support tickets.",
    });

    // run it
    const trace = await support.run("order #4821 lost");
    console.log(trace.steps);

PRICING

## Open-source forever. Cloud when you need it.

### OSS

Free · Apache 2.0

Self-host every primitive on your own infra. Forever, no asterisks.

- Full SDK
- CLI + local tracer
- Community support

Star on GitHub →
POPULAR

### Cloud

$29 /seat /month

Hosted runtime with trace history, evals, and prompt-management UI.

- Hosted observability
- Eval suites + dataset diffs
- Prompt registry
- Team workspaces

Start 14-day trial →

### Enterprise

Custom · annual

BYOC, SOC 2, dedicated capacity, and on-call agent engineers.

- VPC deployment
- SSO + audit log retention
- SOC 2 Type II
- Designated engineer

Talk to sales →
DESIGN SYSTEM REFERENCE

## Tokens, by Voltagent.

Near-black canvas, one electric-green accent, hairline-bordered cards, Inter + SF Mono. The brand reads as documentation that decided to also sell something.

READ THE FULL DESIGN.MD →

### Color

grouped & named

#### Brand

primary#00d992
primary-soft#2fd6a1
primary-deep#10b981

#### Surface

canvas#101010
canvas-soft#1a1a1a
hairline#3d3a39
hairline-soft#b8b3b0

#### Text

ink-strong#ffffff
ink#f2f2f2
body#bdbdbd
mute#8b949e

### Type

inter + sf-mono
display-xl 60 / -0.65 AI agent runtime.
display-lg 36 / -0.9 Section headline.
display-md 24 / -0.6 Card title display.
eyebrow-mono 14 / 2.52 UPPERCASE EYEBROW
body-lg 18 / 0 Lead paragraph at 1.625 line-height — long-form developer prose.
body-md 16 / 0 Default body type — Inter weight 400.
code 13 / 0 await agent.run("ship it")
caption 12 / 0 Fine print at 12px / weight 400.

### Radius

6px buttons · 8px cards
none · 0
xs · 4
sm · 6
md · 8
pill

### Components

working matrix

##### BUTTONS

Start free Read docs Learn more →

##### PILLS & CHIPS

LIVE beta @voltagent/core npx voltagent

##### TEXT INPUT

##### FEATURE CARD

⚡

### Card chrome · 8px radius.

1px hairline border on the dark canvas. No shadow.

##### CODE MOCKUP

hello.ts

    const agent = defineAgent({ model: "gpt-4o" });
    const trace = await agent.run("hello, voltage");

View DESIGN.md ↗