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Earendil has released Pi 1.0, a stable update to its minimal, extensible agent harness, with new support for Codemode, extensions, virtual models and other tools. The company also released Pi Durable, a separate experimental package for building longer-running agentic applications. Both products are MIT licensed.
Earendil has released Pi 1.0, a stable update to its minimal, extensible agent harness, adding features including Codemode, extension support and virtual models. The company also announced Pi Durable, an experimental package for building longer-running agentic applications, extending Pi beyond its coding-agent and terminal use cases.
Earendil describes Pi 1.0 as a hardened version of the software, developed over months with feedback from users who submit issues and pull requests. The company says hundreds of thousands of people use Pi each week; that figure is Earendil’s own account, and the announcement does not provide a measurement method or reporting period beyond weekly use.
The release adds Codemode, which the company says brings native support for MCP and non-LLM models, including Jev and image models. Other listed additions include extensions for virtual models, deferred tool loading, cache warming for Anthropic models, and system messages that can change during a conversation while accounting for the transcript. Pi 1.0 also includes a new TUI theme and makes full-screen mode the default.
Earendil says the features reflect a selective approach: the team waits for changes in agent tooling to prove useful before adding them, weighing functionality against complexity. Its announcement says Pi 1.0 remains designed to be minimal despite the additions. The release is available through installation instructions on Pi’s website, and the company says the software is MIT licensed; documentation is at pi.dev and source code is hosted at github.com/earendil-works/pi.
New Tools, Broader Agent Uses
For developers using Pi, the update adds ways to connect models and tools, customize behavior, and manage how resources are loaded. Virtual-model extensions and Codemode could support more tailored workflows, while deferred tool loading and Anthropic cache warming address how the agent handles tools and model interactions. The announcement describes the features but does not publish benchmark results or quantify performance changes.
Pi Durable marks a separate direction for Earendil: building on Pi’s minimal and malleable design for applications that run longer and can be reached outside a terminal. The company says the package is intended as a substrate for builders and users to steer underlying AI systems. Because it is labeled experimental, it should not be read as a general availability commitment or as evidence of production readiness.
The distinction between the two releases matters. Earendil says it chose to keep Pi focused on its existing shape rather than expand the core product to serve every use case. The new package lets the company explore longer-running applications separately, while keeping Pi 1.0 centered on the agent harness.
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Pi’s Minimalist Design Approach
Earendil says Pi already supported the latest models from major providers and was being used as a coding agent and as a base for building agentic applications. The 1.0 release follows months of feedback and refinement, according to the company, which presents the version number as a point of stability rather than a move toward adding every new agent feature.
The announcement connects Pi Durable to a broader goal of making Pi’s approach available beyond coding and terminal work, including support for longer conversations and tasks. Earendil says the package preserves Pi’s principles of minimalism and flexibility while applying them to a different kind of application. It directs readers to a separate explanation by Mario for more on how Pi Durable was designed.
The company frames its software work around strengthening human agency and developing open protocols. That is Earendil’s stated purpose; the announcement does not describe an independent evaluation of the products’ effects. Both Pi and Pi Durable are released under the MIT license, though the company specifically identifies Pi Durable as experimental.
“Pi is a hardened, minimal, extensible agent harness that you can make your own.”
— Earendil, in its Pi 1.0 announcement
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Limits of the Release Details
The announcement does not include independent testing, performance benchmarks or adoption data beyond Earendil’s statement that hundreds of thousands of people use Pi each week. It also does not specify a calendar date for the release in the supplied material, so the timing is described only as today in the company’s announcement.
Details about Pi Durable’s capabilities, limitations, support plans and path out of experimental status are not laid out in the announcement. The company also does not give specific compatibility requirements or a full account of how the new features compare with earlier Pi versions. Those questions require product documentation or further updates.
long-running AI application package
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User Feedback and Product Development
Earendil says it wants feedback from users and plans to continue developing its tools openly. Pi 1.0 is available now through the installation instructions on pi.dev, while Pi Durable can be installed as an experimental package through npm. The company points users to Pi’s documentation and GitHub repository for access to the software and further information.
No dates for future releases or milestones are included in the announcement. The next indications of how the launch develops are likely to come through user feedback, changes to the project repositories and further documentation—particularly on the scope and status of Pi Durable.
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Key Questions
What is Pi 1.0?
Pi 1.0 is Earendil’s stable release of its minimal, extensible agent harness. The update adds features including Codemode, extension support for virtual models, deferred tool loading and mid-conversation system messages.
What is Pi Durable?
Pi Durable is a separate experimental package for building longer-running agentic applications. Earendil says it extends Pi’s minimal and flexible approach to applications beyond coding agents and terminal use.
Is Pi Durable a stable release?
No. Earendil describes Pi Durable as experimental. Its announcement does not give a timetable for a stable release or specify a route out of experimental status.
How can developers access Pi?
Earendil says Pi 1.0 is available through the installation instructions at pi.dev. The company lists Pi Durable and related packages for installation through npm. Both Pi and Pi Durable are described as MIT licensed.
Source: hn
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