Blaxel Sandboxes

Blaxel Sandboxes are fast-launching compute runtimes in which coding agents can securely execute code and manage files, with ~25ms cold-starts and automatic hibernation when idle. You can use Morph’s fast apply model to update files in a sandbox’s filesystem with near-instant response times through agentic tool calls, leveraging the Morph integration within the sandbox’s MCP server.

Why Blaxel + Morph?

Speed: Blaxel’s 25-ms cold-starts rank among the lowest in serverless sandbox environments, which when combined with Morph’s blazing-fast applies makes for a near-instant user experience.
Security: Your code that gets created by Morph should never be accessed by someone else, and microVM-based sandboxes ensure the highest level of isolation
Price: Only pay for real usage and never more: tokens generated and sandbox active runtime

Quick Setup

Create a Blaxel account and workspace on app.blaxel.ai
Install Blaxel’s Python or TypeScript SDK through one of the following methods:


pnpm install @blaxel/core


npm install @blaxel/core


yarn add @blaxel/core


bun add @blaxel/core


pip install blaxel


uv pip install blaxel


uv init && uv add blaxel

Create a Morph API key to connect to your Morph workspace from the sandboxes
Create your first Blaxel sandbox programmatically, making sure to pass the MORPH_API_KEY and MORPH_MODEL (default = morph-v3-large)

import { SandboxInstance } from "@blaxel/core";

// Create a new sandbox
const sandbox = await SandboxInstance.create({
  name: "my-sandbox",
  image: "blaxel/prod-base:latest",
  memory: 4096,
  ports: [{ target: 3000, protocol: "HTTP" }]
  envs: [
    { name: "MORPH_API_KEY", value: "YOUR_API_KEY" },
    { name: "MORPH_MODEL", value: process.env.MORPH_MODEL || "morph-v3-large" }
  ]
});

// Wait for deployment
await sandbox.wait();

from blaxel.core import SandboxInstance

# Create a new sandbox
sandbox = await SandboxInstance.create({
  "name": "my-sandbox",
  "image": "blaxel/prod-base:latest",
  "memory": 4096,
  "ports": [{ "target": 3000 }]
  "envs": [
    { "name": "MORPH_API_KEY", "value": "YOUR_API_KEY" },
    { "name": "MORPH_MODEL", "value": os.getenv("MORPH_MODEL") or "morph-v3-large" }
  ]
})

# Wait for deployment
await sandbox.wait()

Use the fast apply

Blaxel sandboxes have an MCP server for accessing the file system and processes via tool calls. Morph’s fast apply is accessible exclusively through this MCP server, via the tool codegenEditFile. Use Blaxel SDK to retrieve this tool and others in any compatible agent framework (here in AI SDK format for TS, LangGraph for Python) by first installing the SDK adapters:


pnpm install @blaxel/vercel


npm install @blaxel/vercel


yarn add @blaxel/vercel


bun add @blaxel/vercel

And running the following code to retrieve the fast apply tool as well as others to operate the sandbox. Call the codegenEditFile tool to fast-apply a targeted edit to a specified file, with instructions and partial contents.

import { blTools } from '@blaxel/vercel';

// Get tools from sandbox MCP
const allTools = await blTools([`sandboxes/${sandbox.metadata.name}`]);

// Filter for specific fast apply tool
const morphTool = Object.fromEntries(
  Object.entries(allTools).filter(([key]) =>
    key.startsWith('codegenEditFile')
  )
);

// You can now pass it as a standard tool in an AI SDK agent to use
// …

from blaxel.langgraph import bl_tools

# Get tools from sandbox MCP
all_tools = await bl_tools([f"sandboxes/{sandbox.metadata.name}"])

# Filter for the fast apply tool
morph_tool = [tool for tool in all_tools if tool.name.startswith("codegenEditFile")]

# You can now pass it as a standard tool in a LangGraph agent to use
# …

Get Started

Models

API Reference

Integrations

Why Blaxel + Morph?

Quick Setup

Use the fast apply

​Why Blaxel + Morph?

​Quick Setup

​Use the fast apply

Why Blaxel + Morph?

Quick Setup

Use the fast apply