SEP Phase 4 (engine): commands, session actions, hot reload#29
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ExtensionHost gains command dispatch (command/execute + command/complete), the session-action delegate seam (send_message/send_user_message/append_entry) guarded by the command-tier + epoch context check (-32003 ContextViolation), and hot reload (session_shutdown → epoch fence → respawn → re-init → session_start). New protocol types for commands/shortcuts/flags/session + sep-echo-peer command support. Additive: no host attached = unchanged loop. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
🦋 Changeset detectedLatest commit: 9df7916 The changes in this PR will be included in the next version bump. This PR includes changesets to release 1 package
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Problem
Phase 4 of the Smooth Extension Protocol needs the engine to support extension-registered slash commands, session-mutating actions, and hot reload — with the two-tier context guard that prevents an extension from mutating the session outside a command handler or across a reload.
Solution
Additive to
ExtensionHost/HostDelegate/ protocol (zero behavior change with no host attached):run_command(command/execute, COMMAND-tier context) +complete_command(command/complete, best-effort autocomplete);commands()/shortcuts()surface registrations for a frontend palette.HostDelegate::session_send_message/session_send_user_message(deliver_assteer/follow_up/next_turn) /session_append_entry, each gated byvalidate_command_context(command tier + current epoch → else-32003 ContextViolation, fired before the delegate). Headless defaults report-32004 CapabilityDisabled.reload(name)firessession_shutdown{reason:reload}, bumps the shared epoch (invalidating stale tokens), respawns (generation guard drops late replies), re-inits, firessession_start{reason:reload}. Declared-events clamp re-applied on reload (no cross-restart escalation).CommandExecute*,CommandComplete*,Completion,ShortcutRegistration,DeliverAs,Session*Params),InitializeParams.flags,Registrations.shortcuts.sep-echo-peerregisters a command + shortcut and answers command/execute + command/complete.Verification
cargo testgreen (45 unit incl. exhaustivevalidate_command_contextcases + aHostInboundsession-routing test; newsep_command_reloadintegration test covers dispatch, autocomplete, and reload-epoch-fence). fmt clean; the 2 clippy warnings are pre-existing incheckpoint.rs.🤖 Generated with Claude Code