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Earendil shipped Pi Durable, a framework for building durable AI agents that can run for long periods, survive crashes, and handle multiple conversations simultaneously across different machines. It's designed as a separate harness layer that complements the core Pi coding agent rather than replacing it.
- Pi Durable stores agent state in checkpoints (SQLite, JSONL, or custom backends) so agents resume exactly where they left off after crashes, with aborted model requests resent and tool calls either rerun or reported as interrupted depending on safety.
- The framework runs multiple conversations concurrently without blocking each other, and conversations can fork at any point in their transcript to create branches that share parent history without copying it.
- Extensions bundle system prompts, tools, hooks, and tasks as pluggable units; conversations select which extensions to use, and system prompt changes are picked up on the next request and recorded in the transcript so restarts see exactly what the model saw.