Add AI provider step wrapper functions

[TooTallNate]

This PR adds wrapper functions for AI providers that can be used for the model property when creating a DurableAgent instance. As a POC, only a few of the most popular providers are included:

• Anthropic (@workflow/ai/anthropic)
• Vercel Gateway (@workflow/ai/gateway)
• OpenAI (@workflow/ai/openai)
• Google (@workflow/ai/google)
• xAI (@workflow/ai/xai)

Example

import { DurableAgent } from '@workflow/ai/agent';
import { openai } from '@workflow/ai/openai';
import { convertToModelMessages, type UIMessageChunk } from 'ai';
import { getWritable } from 'workflow';

export async function test() {
  'use workflow';

  const agent = new DurableAgent({
    model: openai('gpt-5.1'),
  });

  await agent.stream({
    messages: convertToModelMessages([
      {
        role: 'user',
        parts: [
          { type: 'text', text: 'Hello world!' },
        ],
      },
    ]),
    writable: getWritable<UIMessageChunk>(),
  });
}

[changeset-bot]

🦋 Changeset detected

Latest commit: d1bef7f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@workflow/ai	Patch

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[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Preview	Comments	Updated (UTC)
example-nextjs-workflow-turbopack	Ready	Preview	Comment	Nov 27, 2025 7:41am
example-nextjs-workflow-webpack	Ready	Preview	Comment	Nov 27, 2025 7:41am
example-workflow	Ready	Preview	Comment	Nov 27, 2025 7:41am
workbench-express-workflow	Ready	Preview	Comment	Nov 27, 2025 7:41am
workbench-fastify-workflow	Error			Nov 27, 2025 7:41am
workbench-hono-workflow	Ready	Preview	Comment	Nov 27, 2025 7:41am
workbench-nitro-workflow	Ready	Preview	Comment	Nov 27, 2025 7:41am
workbench-nuxt-workflow	Ready	Preview	Comment	Nov 27, 2025 7:41am
workbench-sveltekit-workflow	Ready	Preview	Comment	Nov 27, 2025 7:41am
workbench-vite-workflow	Ready	Preview	Comment	Nov 27, 2025 7:41am
workflow-docs	Ready	Preview	Comment	Nov 27, 2025 7:41am

[TooTallNate]

• Support "provider-defined" tools in DurableAgent #434 : 2 dependent PRs (#445 , #474 )
• Add AI provider step wrapper functions #428 👈 (View in Graphite)
• Apply workflow function transformation in "step" mode #420
• Support nested "use step" declarations in non-workflow functions #418
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	npm/​@​ai-sdk/​gateway@​2.0.15
	npm/​@​ai-sdk/​xai@​2.0.37
	npm/​@​ai-sdk/​google@​2.0.43
	npm/​@​ai-sdk/​anthropic@​2.0.49
	npm/​@​ai-sdk/​openai@​2.0.72

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