Pi Agent Files

New Features

• Selective provider base entry points - SDK users can pair @earendil-works/pi-ai/base and @earendil-works/pi-agent-core/base with explicit provider registration to keep bundled applications from including unused provider transports. See pi-ai Base Entry Point and pi-agent-core Base Entry Point.
• Mistral prompt caching - Mistral sessions now use provider-side prompt caching with session affinity and cached-token usage/cost accounting. See API Keys and Environment Variables.
• Post-compaction token estimates - Compact results and compaction events now include estimated post-compaction token counts so clients can show the approximate context reduction. See RPC compact and compaction events.
• OpenRouter Fusion alias - openrouter/fusion is available as a built-in OpenRouter model alias. See API Keys.

Added

• Added inherited @earendil-works/pi-ai/base and @earendil-works/pi-agent-core/base entry points for selective provider registration in bundled applications (#5348 by @FredKSchott).
• Added inherited Mistral prompt caching using the pi session ID as prompt_cache_key, including cached-token usage and cost accounting (#5854).
• Added estimated post-compaction token counts to compact results and compaction events (#5877).
• Added the inherited OpenRouter Fusion alias as openrouter/fusion (#5866 by @dannote).

Fixed

• Updated vulnerable runtime dependencies, including undici and the packaged protobufjs transitive dependency.
• Fixed compaction to refuse sessions with no eligible messages instead of producing empty summaries (#4811).
• Fixed successful overflow-triggered auto-compaction to avoid retrying completed assistant responses (#5720).