Build agents.
Not infrastructure.

Subako.AI is the cloud runtime for the AI agents inside your product. Long-running sessions, secure code execution, credentials and skills, behind one SDK. Bring your own model.

自社プロダクトの中でAIエージェントを動かすためのクラウド基盤。長時間実行のセッション、コード実行、認証情報、スキルを、ひとつのSDKの裏側にまとめます。モデルは自由に選べます。

Get started

Subako.AI, the film. 1:01, with sound.

Why Subako

A model alone stops at an answer.

To do real work, an agent needs a runtime around the model: something that keeps the loop running, holds state across a dropped connection, executes code safely, carries credentials without exposing them, and knows the procedures. Today every product team builds and operates its own.

エージェントが仕事を終えるには、モデルの外側に実行環境が要ります。ループを回し続け、切断をまたいで状態を保ち、コードを安全に実行し、認証情報を漏らさずに運び、手順を知っている部分です。いまは、それをプロダクトごとに各チームが自分で作って運用しています。

A product window wired to a tangle of runtime components
Today. Each team builds, hosts and secures the runtime, for every product.
A product window connected by a single line to the Subako runtime
With Subako. One runtime, hosted and managed, behind one SDK.

What you get

Everything agents need to run.

Five components, one service. Each one is production-grade on its own, and you never operate any of them.

5つのコンポーネントを、ひとつのサービスとして。それぞれが本番品質で、どれも自分で運用する必要はありません。

harness
sessions
sandbox
vault
skills
harnessLong-running executionRuns the reasoning and tool-call loop until the job is done. Context is compacted automatically, and you can steer or stop a run mid-way.
sessionsState and reconnectionAn append-only event log is the only source of truth. Drop the connection and resume from the last event. A crash rebuilds from the log.
sandboxSecure code executionStarts on the first run and costs nothing while idle. Dependencies and network policy are versioned as environments.
vaultCredentialsPer-secret envelope encryption with KMS. Write-only: a secret never appears in a listing and never reaches the model. Per-user vaults let an agent act as that person.
skillsKnowledge and proceduresVersioned bundles of prompts and scripts in the Agent Skills format. Pin a version or follow latest. Metadata is injected into the system prompt for you.

Security by construction

The model never sees a secret.

Prompt-injection defence is structural, not a content filter. Least privilege is declared per tool, approvals gate the risky calls, and credentials stay outside the engine.

プロンプトインジェクション対策はコンテンツフィルタではなく構造で行います。ツール単位で最小権限を宣言し、危険な呼び出しは承認で止め、認証情報はエンジンの外に置きます。

A broker between the agent and your tools

The engine receives tool names, schemas and a bearer issued per run. Real endpoints and credentials are injected by the broker. There is no secret for the model to leak.

Policy per tool, closed by default

Declare allow, require-approval or deny for each tool on each MCP server. Tools you did not name, including ones the server adds later, inherit the default: deny.

Approvals that hold nothing

A call that needs a human parks the run and releases its lease. It resumes once, after the approval. Waiting a week costs nothing.

Encrypted per secret, audited per action

Every secret is envelope-encrypted with its own key under KMS. Every change lands in an append-only audit log. Access across organisations returns 404.

Any model

Any model. Any provider.

Bring your own key. Subako proxies inference in the provider's native wire format and never resells tokens, so a new model capability is usable the day it ships. Every other boundary is an open standard.

APIキーは持ち込み。推論はプロバイダのネイティブ形式のまま中継し、トークンの転売はしません。モデルの新機能は出た日から使えます。ほかの境界もすべてオープンな標準です。

claudegptgeminiopen source
MCPtoolsThe MCP servers you already publish become the agent's tool surface.
AG-UIclientsComing soon. Any AG-UI client will connect.
Agent SkillsknowledgeSkills written for other harnesses carry over unchanged.
BYOKmodelsInference runs on your key. Subako only swaps the key and forwards.

Deployment

Cloud or private.

The same code runs as a multi-tenant cloud, as a dedicated cell in the region you choose, or on your own infrastructure. Only the scheduling policy and the placement change.

同じコードが、マルチテナントのクラウドとして、指定リージョンの専有セルとして、あるいは自社環境の中で動きます。違うのはスケジューリング方針と配置先だけです。

Cloud

Start right away. Tenant isolation per workspace, stateless replicas, sandboxes that start on demand.

Dedicated

Your own cell in your own AWS region. A dedicated engine pool, an egress allow-list, and audit log export.

On-premises

Postgres, S3-compatible storage and KMS. Docker sandboxes. Your existing identity provider over OIDC.

Hackathon

Build with Subako in one afternoon.

Bring your own product and embed an agent into it. Credits are provided on the day, so you do not need an LLM API key. We wrap up with drinks.

自分のサービスにエージェントを組み込んでみてください。クレジットは当日お渡しするので、LLM の API キーは不要です。最後は飲みものを用意した交流の時間です。

Date
Monday, September 14, 2026
Time
15:00 to 19:30 JST
Venue
Plug and Play Japan, Shibuya, Tokyo
Who can join
Any developer. 30 seats, approval required.
Fee
Free

The infrastructure for running AI agents.