> ## Documentation Index
> Fetch the complete documentation index at: https://phaseo.app/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Effect AI SDK

> Use Phaseo from Effect TypeScript applications.

Use this guide when your application already uses Effect and you want Phaseo behind an Effect service or workflow.

## Status

Phaseo exposes OpenAI-compatible HTTP endpoints. Effect's first-party provider packages are useful when they support the provider you need directly; if your installed Effect OpenAI package does not expose a base URL option, call Phaseo through Effect's HTTP client or wrap the [OpenAI SDK](./openai-sdk.mdx) in your own Effect layer.

## Install

```bash theme={null}
npm install effect @effect/platform
```

## Call Phaseo with Effect HTTP

```ts theme={null}
import { FetchHttpClient, HttpClient, HttpClientRequest } from "@effect/platform";
import { Config, Effect, Redacted } from "effect";

const generate = Effect.gen(function* () {
	const apiKey = yield* Config.redacted("PHASEO_API_KEY");
	const client = yield* HttpClient.HttpClient;

	const request = HttpClientRequest.post(
		"https://api.phaseo.ai/v1/chat/completions",
	).pipe(
		HttpClientRequest.bearerToken(Redacted.value(apiKey)),
		HttpClientRequest.jsonBody({
			model: "openai/gpt-5-nano",
			messages: [{ role: "user", content: "Reply with only: ok" }],
		}),
	);

	return yield* client.execute(request).pipe(
		Effect.flatMap((response) => response.json),
	);
});

const runnable = generate.pipe(Effect.provide(FetchHttpClient.layer));
```

## Wrap the OpenAI SDK in an Effect service

If you already use the official OpenAI SDK elsewhere, keep the Phaseo configuration in one layer:

```ts theme={null}
import OpenAI from "openai";
import { Config, Effect } from "effect";

const makeClient = Effect.gen(function* () {
	const apiKey = yield* Config.string("PHASEO_API_KEY");

	return new OpenAI({
		apiKey,
		baseURL: "https://api.phaseo.ai/v1",
	});
});
```

## Notes

* Use `https://api.phaseo.ai/v1` for OpenAI-compatible calls.
* Keep model ids in Phaseo format, for example `openai/gpt-5-nano`.
* Use a custom Effect layer when you want a provider-style abstraction across the rest of your application.
* Test streaming and tool calls with your exact Effect package versions before production rollout.

## Related

* [OpenAI SDK](./openai-sdk.mdx)
* [AI SDK](./ai-sdk.mdx)
* [Streaming](../streaming.mdx)