v0.65.0

Subagents now run on native Pi sessions, so everyday delegation has fewer moving parts and less process-launch fragility. Workflow progress is easier to scan, with compact lane summaries and clearer supervisor messages in the parent session. Model selection is also safer: missing, excluded, or dynamically registered provider models now produce the right outcome instead of silently falling back or failing before provider setup completes.

Highlights:

• Native Pi-session subagents replace spawned pi child processes.
• Workflow status is easier to read with compact lane summaries and better supervisor cards.
• Model selection now fails clearly when configured candidates are unavailable.
• Managed worktrees support validated baseRef values and safer per-project nesting.
• Background children can use provider-extension models reliably, including router-style dynamic providers.

Need to know:

Affected users	Change
Agents that need MCP tools or provider-extension models	Use background children. Foreground children run in-process and no longer load ambient extensions.
Package import users	pi-subagents/pi-args is now pi-subagents/child-tool-plan.
Custom Pi binary users	PI_SUBAGENT_PI_BINARY now applies only to Herdr project panes and the profile model probe.

Full changelog:

[0.65.0] - 2026-09-04

Highlights

• Subagents now run through native Pi sessions instead of spawning separate pi processes, making delegation simpler and less fragile.
• Workflow status is easier to scan with compact lane summaries and clearer supervisor messages.
• Model selection fails clearly when configured models are unavailable, instead of silently using a provider default.
• Managed worktrees are safer and more flexible, with validated baseRef support and per-project nesting.
• Background children can use provider-extension models reliably, including dynamically registered models such as router providers.

Added

• Include sanitized model, provider, reason, and expiry details when no usable subagent model candidates remain. Thanks @AlexKucera for #1841.
• Allow managed worktrees to start from a validated baseRef instead of always using HEAD. Thanks @jaudiger for #1842.

Changed

• Run subagents as native Pi AgentSessions instead of spawned pi CLI processes (#1844). Foreground children run in the parent process, and background children run in the detached runner.
• Foreground children no longer load ambient extensions. Use background children for agents that need MCP tools or provider-extension models. Background children require Pi from the installed @earendil-works/pi-coding-agent package, not a standalone pi binary.
• Rename package subpath pi-subagents/pi-args to pi-subagents/child-tool-plan; PI_SUBAGENT_PI_BINARY now applies only to Herdr project panes and the profile model probe.
• Replace collapsed async workflow role summaries with a compact lane view while keeping full details available when expanded (#1827).
• Add contact_supervisor to the bundled reviewer and scout tool allowlists without adding mutation tools (#1846).

Fixed

• Drop only malformed persisted model-exclusion entries and rewrite the cleaned cache.
• Stop live workflow children when a run-level stop targets an in-memory async workflow controller.
• Fail closed when a fallback-only model configuration resolves no launch candidates. Thanks @AdenosineTP for #1853.
• Resolve native child models after child extensions register provider models. Thanks @mystery4f for #1855.
• Ignore stale authentication-related model exclusions after Pi's auth.json is refreshed, while preserving quota, rate-limit, overload, and model-unavailable exclusions. Thanks @wesleyfei1 for #1835.
• Show native supervisor requests and outbound replies as bounded TUI cards in parent sessions (#1845).
• Suppress stale async supervisor-request notices after the native request has already been answered (#1838). Thanks @VladimirGVP.
• Flush async workflow result assembly after session replacement when every child is already terminal, without permitting stale-context launches (#1833). Thanks @redcomet168.
• Accept calendar/platform claude --version output during Claude Code adapter preflight while retaining required launch-flag validation. Thanks @drouhard.
• Show passive local command availability for external CLI agents in capability listings without replacing launch preflight (#1829). Thanks @drouhard.
• Nest native managed worktrees under per-project directories while preserving unsafe-location checks (#1831). Thanks @moofone.