Earendil Ships Pi 1.0 and Experimental Pi Durable Package

Earendil announced the release of Pi 1.0, a hardened, minimal, and extensible agent harness designed for stability and user customization. The release incorporates months of community feedback, adhering to a philosophy of adopting only proven features to maintain simplicity. Pi is already used by hundreds of thousands of people weekly as a daily driver coding agent and a substrate for building agentic applications.

Key Features in Pi 1.0

The update introduces several technical enhancements focused on interoperability and performance:

• Codemode: Native support for MCP (Model Context Protocol) and non-LLM models, including Jev and image models.
• Extension Support: Ability to define and use virtual models.
• Deferred Tool Loading: Optimizes resource usage by loading tools only when needed.
• Cache Warming: Specific optimizations for Anthropic models.
• Mid-Conversation System Messages: Allows transcript-aware changes to prompts and tools during a session.
• UI Updates: A new TUI theme and full-screen mode enabled by default.

Pi Durable: A New Substrate for Long-Running Tasks

Alongside Pi 1.0, Earendil launched Pi Durable, an experimental package designed for long-running agentic applications. While Pi remains focused on minimalism and terminal-based coding, Pi Durable extends these principles to support durable, multi-surface interactions and longer conversations. It allows builders and users to steer underlying intelligence with greater flexibility.

Availability and Licensing

Both Pi 1.0 and Pi Durable are MIT licensed and available immediately.

• Pi 1.0 Installation:
  • Unix/Linux/macOS: curl -fsSL https://pi.dev/install.sh | sh
  • Windows: powershell -c "irm https://pi.dev/install.ps1 | iex"
• Pi Durable Installation:
  • npm install @earendil-works/pi-durable @earendil-works/pi-ai @earendil-works/chord

Documentation is hosted at pi.dev and source code is available at github.com/earendil-works/pi.