SEP Phase 4 (spec + SDK): commands, flags, shortcuts, session#151
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Spec: command-complete schema, context on session params (+ send_user_message deliver_as), flags delivery + shortcuts in initialize, new fixtures + $invalid cases, echo.mjs command support. SDK: registerCommand/registerFlag/ registerShortcut, CommandContext with bound session (sendMessage/ sendUserMessage/appendEntry), createTestHost runCommand/completeCommand + tier-guarded session service, runConformance command steps. Demo: plan-mode (flag + command + tool_call intercept + widget + appendEntry across reload). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
🦋 Changeset detectedLatest commit: e859bc4 The changes in this PR will be included in the next version bump. This PR includes changesets to release 2 packages
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Problem
Phase 4 of the Smooth Extension Protocol adds the command surface (slash commands + autocomplete + flags + shortcuts) and session-mutating actions to the spec, the TS SDK, and a flagship demo that exercises phases 2–4 together.
Solution
Spec (
spec/extension/):command-complete.schema.jsonfor argument autocomplete.session.schema.jsonnow carries the dispatchcontexton every params object — the wire form of the command-tier + epoch guard the host enforces — and addssend_user_message(deliver_assteer/follow_up/next_turn).initialize.schema.jsongains aflagsdelivery map (params) and ashortcutslist +ShortcutRegistration(registrations).$invalidcases (sessioncontextrequired, completionvaluerequired).echo.mjsregisters a command + shortcut and answers command/execute + command/complete.SDK (
typescript/extension-sdk/):smooth.registerCommand(optionalcompletecompleter),registerFlag(+getFlag),registerShortcut.CommandContextbound to their command-tier context:session.sendMessage/sendUserMessage/appendEntry,ui,hasUI,args.createTestHost:runCommand,completeCommand, and asession/*service enforcing the same command-tier guard the engine does (event-tier → -32003), recording every session call.runConformancereplays command/execute + command/complete.Demo:
plan-mode— flag--plan+ command/plantoggle plan mode; atool_callintercept blocks write/edit/apply_patch/bash while on; each toggle pushes aset_widgetrender block and persists an LLM-invisibleappendEntry(survives a hot reload — the flag re-seeds state, the transcript keeps history).Verification
typecheck+testgreen across@smooai/smooth-operator(35, incl. the fixture-driven extension-conformance),@smooai/smooth-operator-server(132), and@smooai/smooth-extension-sdk(35, incl. the newcommand-pathsuite and the live-subprocessrunConformance). The Rust engine host that consumes this spec lands in smooth-operator-core#29.🤖 Generated with Claude Code