Files
msd-core/.changeset/1682-opencode-subset-dialect.md
Tom Boucher 325e9fad4b feat(#1682): OpenCode session.idle + opencode-subset dialect + Claude parity — Slice 1b/c (#1930)
* feat(#1682): OpenCode session.idle + opencode-subset dialect + Claude parity — Slice 1b/c

- Plugin (.opencode/plugins/gsd-core.js): handle session.idle (↔ Claude Stop
  lifecycle point; no-op sentinel — state already persisted to .planning/).
  Completes the compaction/idle pair (#1914 shipped compaction).
- Declare hookEvents: 'opencode-subset' in the OpenCode descriptor — the
  reserved dialect now has a real consumer (no longer zero-consumer).
- host-integration.cts: add HOOK_EVENT_SURFACES + hookEventSurfaceFor() — the
  pure consumer that resolves a dialect to its host-fireable event surface.
  opencode-subset = session/tool/file subset with NO workflow-phase events
  (engine owns phase sequencing; ADR-1239 §OpenCode binding).
- Tests: hookEventSurfaceFor unit tests (claude/gemini/opencode-subset/null);
  plugin session.idle no-throw; compaction breadcrumb; opencode-subset surface
  parity vs the plugin's handlers (Claude parity).

* fix(#1682): don't declare hookEvents on opencode (hooksSurface:none invariant)

The repo invariant couples runtime.hookEvents to the managed settings.json hook
surface: hooksSurface:'none' runtimes (opencode — plugin owns hooks) must NOT
declare hookEvents. Declaring 'opencode-subset' there violated 3 capability-
registry invariants + 2 install-plan golden masters + opencode golden parity.

The opencode-subset dialect is still IMPLEMENTED — just not via the legacy
descriptor field: hookEventSurfaceFor() (host-integration.cts) is its consumer,
and the OpenCode plugin consumes the subset events at runtime (session.idle
added here; compaction shipped in #1914). Declaring it on the descriptor would
require weakening the hooksSurface:none ⇔ no-hookEvents invariant (flagged for
decision).

* fix(#1682): refresh opencode golden parity for plugins/gsd-core.js (session.idle)

* docs(changeset): OpenCode session.idle + opencode-subset dialect (#1682)

* docs(changeset): backfill PR #1930
2026-07-02 16:16:00 -04:00

733 B

type, pr
type pr
Added 1930

OpenCode plugin handles session.idle + the opencode-subset hook dialect is implemented — the GSD OpenCode plugin now recognizes session.idle (↔ Claude Stop lifecycle point), completing the compaction/idle pair (#1914 shipped compaction). The reserved opencode-subset dialect gains a consumer — hookEventSurfaceFor() in host-integration.cts — describing OpenCode's session/tool/file event subset (no workflow-phase events; the engine owns phase sequencing, ADR-1239 §OpenCode binding). Adds a Claude-parity test asserting the plugin covers the full declared subset. (#1682)