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Reference · livepage:docs-harness-features-backlog-gaps-parallelization-gap-par-001
GAP-PAR-001: Concurrent Effect Execution overview
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GAP-PAR-001: Concurrent Effect Execution
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GAP-PAR-001: Concurrent Effect Execution
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docs/harness-features-backlog/gaps/parallelization/gap-par-001
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# GAP-PAR-001: Concurrent Effect Execution
| Field | Value |
|-------|-------|
| Category | parallelization |
| Priority | High |
| Effort | L |
| Status | Partial |
## Description
Execute multiple independent effects concurrently within a single orchestration iteration, using parallelGroupId hints to identify effects safe for concurrent dispatch.
## Current State
ctx.parallel.all() batches effect requests, but these are dispatched to the external orchestrator as a list and executed one at a time. The parallelGroupId scheduler hint exists but is not used for concurrent execution.
## Target State
Effects within the same parallelGroupId execute concurrently via multiple harness invocations or Pi sessions. Results posted as they complete. True parallelism without SDK changes -- only babysit skill modification needed.
## Dependencies
- [GAP-PAR-009](../parallelization/GAP-PAR-009.md) -- execution strategy framework
## Key Files
| Component | Path |
|-----------|------|
| Parallel intrinsics | `packages/sdk/src/runtime/intrinsics/parallel.ts` |
| Process context | `packages/sdk/src/runtime/processContext.ts` |
| Task batching | `packages/sdk/src/tasks/batching.ts` |
| Scheduler hints | `packages/sdk/src/runtime/types.ts` |
## Recommendation
Phase 1 implementation. Modify the babysit skill to detect parallelGroupId in pending actions and execute effects within the same group concurrently.
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