SEP Phase 2 (SDK + spec): hook handlers + observe bus#147
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extension-sdk: smooth.on(name, handler) now covers intercept hooks — return
{block,reason} to veto or {patch} to rewrite input; the extension folds its own
handlers (first block wins, patches shallow-merge and thread) and the host
chains across extensions. Hook names stay out of event subscriptions.
createTestHost gains callHook(). New permission-gate demo blocks dangerous bash
via a fail-closed tool_call hook.
spec/extension: event schema gains optional seq (absent on the events_lost
marker) + model_select->ModelResolved parity note; fixtures add a seq'd event,
the events_lost marker, tool_execution_start, and the tool_result hook pair.
Rust + TS conformance green.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
🦋 Changeset detectedLatest commit: d20e78a 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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Phase 2 of SEP — the SDK + spec side, paired with smooth-operator-core's engine PR. Builds on Phase 0 (#142) + Phase 1 (#145).
What ships
@smooai/smooth-extension-sdk:smooth.on(name, handler)now covers intercept hooks — return{ block, reason? }to veto or{ patch }to rewrite the input. The extension folds its own handlers (firstblockshort-circuits;patches shallow-merge and thread to the next), matching pi'son(...)signature; the host chains outcomes across extensions. Hook names are kept out of the reported eventsubscriptions.createTestHostgainscallHook(hook, input); newpermission-gatedemo blocks dangerousbashvia a fail-closedtool_callhook.seq(absent on theevents_lostmarker) +model_select → AgentEvent::ModelResolvedparity note; fixtures add a seq'd event, theevents_lostmarker (drop-N → count),tool_execution_start, and thetool_resulthook pair.Tests
extension-sdk: 19 tests green (incl. new
hook.test.ts: block/patch/short-circuit/subscription-filtering + permission-gate).extension-conformance(fixtures↔schema) green. SDK typecheck + build clean.🤖 Generated with Claude Code