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pi-meta-oauth: Muse Spark in the pi agent

Meta Model API OAuth for the pi coding agent. It routes Muse Spark through the openai-responses provider, since the author notes the Muse prompt cache hits about 0% on /chat/completions, and sends 24h prompt-cache retention.

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# pi-meta-oauth

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Meta Model API OAuth for [pi](https://pi.dev).

- Use Muse Spark models through Pi's `openai-responses` provider (not `/chat/completions` — Muse prompt cache is ~0% there)
- Send `prompt_cache_retention: "24h"` on Meta Responses requests unless the payload already set a retention
- Device authorization against `https://auth.meta.com`
- Model API-key minting through `POST https://api.meta.ai/muse-code/key`
- Dynamic Muse model catalog from `GET https://api.meta.ai/v1/models`

## Install

```bash
# OAuth-only branch
pi install git:github.com/BlockedPath/pi-meta-oauth@meta-oauth-only

# Or from a local checkout
pi install /absolute/path/to/pi-meta-oauth

pi --list-models meta
```

## Login

```text
/login meta
```

Pi displays a device code, opens the Meta authorization flow, and mints a Model API key. Credentials are stored by Pi in `~/.pi/agent/auth.json` under provider `meta`:

```json
{ "meta"

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