Agent Breaking Changes_

← Pi

Pi v0.86.1

2026-09-20 · official notes

Summary

• New Features
• Meta Muse provider — Sign in with Meta using /login meta or use METAAPIKEY to access Muse Spark models. See Meta (Muse subscription).
• Added Meta (Muse subscription) login via /login meta with automatic Model API key refresh, plus METAAPIKEY support (#9096 by @xl0).

Full notes

### New Features

- **Meta Muse provider** — Sign in with Meta using `/login meta` or use `META_API_KEY` to access Muse Spark models. See [Meta (Muse subscription)](https://github.com/earendil-works/pi/blob/v0.86.1/packages/coding-agent/docs/providers.md#meta-muse-subscription).

### Added

- Added Meta (Muse subscription) login via `/login meta` with automatic Model API key refresh, plus `META_API_KEY` support ([#9096](https://github.com/earendil-works/pi/pull/9096) by [@xl0](https://github.com/xl0)).

### Changed

- Enabled Node's persistent compile cache before loading the bundled CLI runtime, reducing repeat launch time.

### Fixed

- Fixed `/bug` descriptions dropping line breaks from pasted diagnostics.
- Fixed `/bug` hints appearing for user cancellations and retryable provider failures such as service unavailability.
- Fixed clipboard copy failing in containers and WSL without WSLg by restoring the OSC 52 fallback when no display is available, and added a verified Windows clipboard backend for WSL ([#9688](https://github.com/earendil-works/pi/issues/9688)).
- Fixed inherited z.ai `Prompt too long` errors not being recognized as context overflow ([#9805](https://github.com/earendil-works/pi/issues/9805)).
- Fixed inherited Cerebras models advertising unsupported strict tool schemas, which caused HTTP 400 errors when strict and non-strict tools were mixed ([#9804](https://github.com/earendil-works/pi/pull/9804) by [@EdenGottlieb](https://github.com/EdenGottlieb)).