feat(harness): add opencode hook bridge plugin and dialect - #1365
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August 29, 2026 14:37
Add a Scion hook bridge for the OpenCode harness, enabling hook-based event visibility (status, logging, hub, limits, telemetry) for OpenCode agents. Three changes: - Plugin (scion-bridge.js): ESM module loaded by OpenCode at startup. Subscribes to session, tool, message, permission, and error events, piping each as JSON to `sciontool hook --dialect=opencode`. Uses node child_process.execSync (no bun dependency). All calls are best-effort with try/catch to never crash the plugin. - Dialect (dialect.yaml): Data-driven mapping from OpenCode plugin event names to normalized Scion events. Covers 8 of 12 non-internal scion events; unmapped: agent-start, subagent-end, response-complete, model-start (no OpenCode hooks available). - Config update: max_turns upgraded to "yes", max_model_calls to "partial" (message.updated proxies model-end; no model-start hook).
Address R1 review findings on PR #1365: - R1 (Required): Add 500ms debounce to message.updated handler to prevent per-chunk firing during streaming, which caused execSync blocking and inflated model-end counts - O2 (Optional): Add conditional debug logging (SCION_HOOK_DEBUG) to catch block instead of silently swallowing errors - O3 (Optional): Add comment documenting field name assumptions and opencode plugin API version basis - O1 (Optional): Skipped — Go test changes deferred as follow-up to avoid CI risk from unrelated build issues
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Summary
harnesses/opencode/home/.config/opencode/plugins/scion-bridge.js): ESM module that subscribes to OpenCode lifecycle events (session, tool, message, permission, error) and pipes JSON payloads tosciontool hook --dialect=opencode. Usesnode:child_process.execSync(no bun dependency). All calls are best-effort with try/catch.harnesses/opencode/dialect.yaml): Data-driven mapping from 8 OpenCode plugin events to normalized Scion events (session-start, session-end, agent-end, tool-start, tool-end, model-end, notification, prompt-submit).harnesses/opencode/config.yaml): Upgradesmax_turnstoyesandmax_model_callstopartial(message.updated proxies model-end; no model-start hook available).Event Coverage
Test plan
python3 -c "import yaml; yaml.safe_load(open('harnesses/opencode/dialect.yaml'))"python3 -c "import yaml; yaml.safe_load(open('harnesses/opencode/config.yaml'))"node --checkwith.mjsextension ornode -efallbackLoadMappingDialect/DiscoverMappingDialectsciontool hook --dialect=opencode