EPIC: Subplan Spawning & Parallel Execution — Three-Way Merge #4972

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opened 2026-04-08 23:41:28 +00:00 by freemo · 2 comments
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Epic: Subplan Spawning & Parallel Execution

This Epic covers the implementation of subplan spawning during plan execution, parallel execution with configurable concurrency limits, and three-way merge strategies for combining subplan results.

Demonstrable Capability

When this Epic is complete, a developer can:

  1. Execute a plan that spawns child subplans
  2. See subplans execute in parallel with configurable concurrency
  3. Have subplan results merged back using three-way merge
  4. Track parent plan status including all subplan statuses

Child Issues

Definition of Done

  • All child issues are closed
  • Plans spawn child subplans during execution
  • Parallel subplan execution works with max_parallel
  • Three-way merge combines non-conflicting changes
  • Conflicts surfaced to user
  • Parent plan tracks all subplan statuses
  • All nox stages pass
  • Coverage >= 97%

Metadata

  • Branch Naming Convention: feat/m4/subplan-execution
  • Milestone: v3.3.0
  • Parent Legendary: #4942

Automated by CleverAgents Bot
Supervisor: Epic Planning | Agent: epic-planner

## Epic: Subplan Spawning & Parallel Execution This Epic covers the implementation of subplan spawning during plan execution, parallel execution with configurable concurrency limits, and three-way merge strategies for combining subplan results. ### Demonstrable Capability When this Epic is complete, a developer can: 1. Execute a plan that spawns child subplans 2. See subplans execute in parallel with configurable concurrency 3. Have subplan results merged back using three-way merge 4. Track parent plan status including all subplan statuses ### Child Issues <!-- Updated by automation after child issues are created --> ### Definition of Done - [ ] All child issues are closed - [ ] Plans spawn child subplans during execution - [ ] Parallel subplan execution works with max_parallel - [ ] Three-way merge combines non-conflicting changes - [ ] Conflicts surfaced to user - [ ] Parent plan tracks all subplan statuses - [ ] All nox stages pass - [ ] Coverage >= 97% ## Metadata - **Branch Naming Convention**: `feat/m4/subplan-execution` - **Milestone**: v3.3.0 - **Parent Legendary**: #4942 --- **Automated by CleverAgents Bot** Supervisor: Epic Planning | Agent: epic-planner
Owner

Child Issues Created

The following child issues have been created for this Epic:

  • #4995 — feat(subplans): implement SubplanSpawner to create child plans during Execute phase (foundational — must be done first)
  • #4998 — feat(subplans): implement parallel subplan executor with configurable max_parallel concurrency (depends on #4995)
  • #4999 — feat(subplans): implement three-way merge strategy for combining subplan results (depends on #4998)

Note: These issues were placed in Priority/Backlog (no milestone) because milestone v3.3.0 is converging (108 closed vs 71 open). A maintainer should assign them to the appropriate milestone.

Dependency Chain: #4995#4998#4999 → Epic #4972


Automated by CleverAgents Bot
Supervisor: Epic Planning | Agent: epic-planner

## Child Issues Created The following child issues have been created for this Epic: - [ ] #4995 — feat(subplans): implement SubplanSpawner to create child plans during Execute phase *(foundational — must be done first)* - [ ] #4998 — feat(subplans): implement parallel subplan executor with configurable max_parallel concurrency *(depends on #4995)* - [ ] #4999 — feat(subplans): implement three-way merge strategy for combining subplan results *(depends on #4998)* **Note**: These issues were placed in `Priority/Backlog` (no milestone) because milestone v3.3.0 is converging (108 closed vs 71 open). A maintainer should assign them to the appropriate milestone. **Dependency Chain**: #4995 → #4998 → #4999 → Epic #4972 --- **Automated by CleverAgents Bot** Supervisor: Epic Planning | Agent: epic-planner
Owner

Issue triaged by project owner:

  • State: Verified
  • Priority: Medium — Subplan spawning and parallel execution enable complex multi-step workflows; important but builds on correction engine
  • Milestone: v3.3.0
  • Story Points: 34 — XXL — Epic covering subplan spawning, parallel execution, and three-way merge for plan state
  • MoSCoW: Should Have — Subplan spawning is important for complex workflows but the system can function without it for simpler use cases; it extends the core plan execution model
  • Parent Legendary: #4942

This Epic is valid. It covers subplan spawning, parallel execution coordination, and the three-way merge algorithm for plan state reconciliation.


Automated by CleverAgents Bot
Supervisor: Project Owner | Agent: project-owner

Issue triaged by project owner: - **State**: Verified - **Priority**: Medium — Subplan spawning and parallel execution enable complex multi-step workflows; important but builds on correction engine - **Milestone**: v3.3.0 - **Story Points**: 34 — XXL — Epic covering subplan spawning, parallel execution, and three-way merge for plan state - **MoSCoW**: Should Have — Subplan spawning is important for complex workflows but the system can function without it for simpler use cases; it extends the core plan execution model - **Parent Legendary**: #4942 This Epic is valid. It covers subplan spawning, parallel execution coordination, and the three-way merge algorithm for plan state reconciliation. --- **Automated by CleverAgents Bot** Supervisor: Project Owner | Agent: project-owner
HAL9000 added this to the v3.3.0 milestone 2026-04-09 00:44:15 +00:00
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Reference
cleveragents/cleveragents-core#4972
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