Code formatting is now significantly faster in Java, Kotlin, TypeScript, Ruby, and Python SDKs by eliminating redundant operations, cutting some tasks from several seconds (and up to ~2 minutes in Java and Kotlin) down to just milliseconds.

Users can now launch a remote MCP server using Streamable HTTP transport.

When you pass --transport=http, the server uses the Streamable HTTP transport instead of stdio, allowing it to run remotely (e.g., on EC2, Fly.io, or Kubernetes). You can optionally specify the port with --port.

npx -y my-org-mcp --transport=http

# if you publish your server via Docker Hub, run it from the image:
docker run --rm -i myorg/my-api-mcp --transport

Learn more about remote MCP servers in docs.

A new code execution tool is now available for Stainless generated MCP servers. Instead of exposing one tool per API method, the server can now expose a single tool that accepts TypeScript code and executes it in a secure Deno sandbox against your generated SDK.

Code execution reduces context window usage and is often faster and more accurate than exposing dozens of discrete tools. The feature is currently supported for local MCP servers, with remote support coming soon.

Check out docs for more info.

MCP servers generated by Stainless now includes a docs search tool that lets LLMs query up-to-date documentation for your Stainless-generated SDKs. The documentation is served in Markdown optimized for model consumption, based on your latest OpenAPI spec and Stainless Config.

See docs for more details.

We now support choosing “CLI” (command line interface) as a target for SDK generation. This lets you automatically generate a command line tool for your SDK.

This feature is still experimental and we may introduce breaking changes to how command line arguments are parsed. See docs for more information.

Preview builds let you see how changes to your OpenAPI spec and Stainless config will affect your SDKs.

Pull requests to your GitHub repository that update the OpenAPI spec will build your SDKs and make a comment on the pull request with the results.

See our documentation on automating builds for more information and setup instructions.

If you participated in the beta by using build-sdk-action, we encourage you to migrate. See the build-sdk-action README for migration details.

Stainless now supports generating methods to parse incoming webhooks into types defined in your OpenAPI specification and verify standard webhook signatures.

app.post('/webhook', async (req, res) => {
  const event: MyWebhookEvent = client.webhooks.unwrap(
    req.body.toString(),
    req.headers,
  );
  ...
});

See docs for more details.

The Stainless generator now automatically retrieves, manages, and refreshes access_tokens for APIs using OAuth client credentials.

const client = new Client({
  clientId: '…',
  clientSecret: '…',
})

client.todos.create()

You can now generate a PHP SDK for your API using Stainless. Create and configure your project to get started.
For any feedback or feature requests, ping hao@.

You can now generate a C# SDK for your API using Stainless. Create and configure your project to get started.

For any feedback or feature requests, ping tomer@.