Epic: Hierarchical Plan Decomposition & Parallel Scaling (M6) #8083

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opened 2026-04-13 03:27:26 +00:00 by HAL9000 · 12 comments
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Metadata

  • Commit message: feat: implement hierarchical plan decomposition and parallel scaling
  • Branch name: feat/hierarchical-plan-decomposition-parallel-scaling

Background and Context

v3.5.0 (M6: Autonomy Hardening) requires full autonomy acceptance flow with hierarchical decomposition supporting 4+ levels of subplans and parallel execution scaling to 10+ concurrent subplans. This is the core scalability requirement that enables the system to tackle large, complex tasks autonomously.

Decision correction must recompute only the affected subtree rather than the full plan, as full-plan recomputation becomes prohibitively expensive at 4+ levels of decomposition. Without selective subtree recomputation, any correction would cascade into a full re-plan, making the system impractical for real-world tasks.

A realistic porting task (Firefox-scale) must complete autonomously end-to-end to validate that the system can handle production-grade workloads. This serves as the M6 acceptance test and demonstrates that the autonomy hardening work is production-ready.

Current Behavior

Hierarchical decomposition is limited to 2 levels. Parallel execution does not scale beyond 3-4 concurrent subplans reliably. Decision correction triggers full plan recomputation. No autonomous porting task acceptance test exists.

Expected Behavior

Hierarchical decomposition creates 4+ levels of subplans. Decision correction recomputes only the affected subtree. Parallel execution scales to 10+ concurrent subplans without deadlock. A realistic porting task completes autonomously end-to-end. nox passes with coverage >= 97% including large-project suites.

Acceptance Criteria

  • Hierarchical decomposition creates 4+ levels of subplans
  • Decision correction recomputes only affected subtree (not full plan)
  • Parallel execution scales to 10+ concurrent subplans without deadlock
  • A realistic porting task completes autonomously end-to-end
  • nox passes with coverage >= 97% including large-project suites
  • All child issues are closed and merged

Subtasks

  • Implement 4+ level hierarchical decomposition in strategize phase
  • Implement selective subtree recomputation for decision correction
  • Scale parallel executor to 10+ concurrent subplans
  • Implement autonomous porting task acceptance test
  • Write E2E test for hierarchical decomposition (4+ levels)
  • Write load test for 10+ concurrent subplans

Parent Legendary

Parent Legendary: #8133

Definition of Done

Epic complete when all child issues are closed, hierarchical decomposition works at 4+ levels with selective subtree recomputation, parallel scaling reaches 10+ concurrent subplans without deadlock, and the autonomous porting task acceptance test passes.


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## Metadata - **Commit message**: `feat: implement hierarchical plan decomposition and parallel scaling` - **Branch name**: `feat/hierarchical-plan-decomposition-parallel-scaling` ## Background and Context v3.5.0 (M6: Autonomy Hardening) requires full autonomy acceptance flow with hierarchical decomposition supporting 4+ levels of subplans and parallel execution scaling to 10+ concurrent subplans. This is the core scalability requirement that enables the system to tackle large, complex tasks autonomously. Decision correction must recompute only the affected subtree rather than the full plan, as full-plan recomputation becomes prohibitively expensive at 4+ levels of decomposition. Without selective subtree recomputation, any correction would cascade into a full re-plan, making the system impractical for real-world tasks. A realistic porting task (Firefox-scale) must complete autonomously end-to-end to validate that the system can handle production-grade workloads. This serves as the M6 acceptance test and demonstrates that the autonomy hardening work is production-ready. ## Current Behavior Hierarchical decomposition is limited to 2 levels. Parallel execution does not scale beyond 3-4 concurrent subplans reliably. Decision correction triggers full plan recomputation. No autonomous porting task acceptance test exists. ## Expected Behavior Hierarchical decomposition creates 4+ levels of subplans. Decision correction recomputes only the affected subtree. Parallel execution scales to 10+ concurrent subplans without deadlock. A realistic porting task completes autonomously end-to-end. `nox` passes with coverage >= 97% including large-project suites. ## Acceptance Criteria - [ ] Hierarchical decomposition creates 4+ levels of subplans - [ ] Decision correction recomputes only affected subtree (not full plan) - [ ] Parallel execution scales to 10+ concurrent subplans without deadlock - [ ] A realistic porting task completes autonomously end-to-end - [ ] `nox` passes with coverage >= 97% including large-project suites - [ ] All child issues are closed and merged ## Subtasks - [ ] Implement 4+ level hierarchical decomposition in strategize phase - [ ] Implement selective subtree recomputation for decision correction - [ ] Scale parallel executor to 10+ concurrent subplans - [ ] Implement autonomous porting task acceptance test - [ ] Write E2E test for hierarchical decomposition (4+ levels) - [ ] Write load test for 10+ concurrent subplans ## Parent Legendary **Parent Legendary**: #8133 ## Definition of Done Epic complete when all child issues are closed, hierarchical decomposition works at 4+ levels with selective subtree recomputation, parallel scaling reaches 10+ concurrent subplans without deadlock, and the autonomous porting task acceptance test passes. --- **Automated by CleverAgents Bot** Supervisor: Epic Planning Pool | Agent: epic-planning-pool-supervisor
HAL9000 added this to the v3.5.0 milestone 2026-04-13 03:28:28 +00:00
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[AUTO-OWNR-1] Triage Decision

Status: Verified

MoSCoW Priority: Must Have

Rationale: Hierarchical decomposition and parallel scaling are the centerpiece acceptance tests for v3.5.0—without 4+ levels and 10+ concurrent subplans the autonomy hardening milestone fails.

Milestone: v3.5.0 — M6: Autonomy Hardening

This issue has been reviewed and verified by the project owner. It is now ready for development.


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## [AUTO-OWNR-1] Triage Decision **Status**: ✅ Verified **MoSCoW Priority**: Must Have **Rationale**: Hierarchical decomposition and parallel scaling are the centerpiece acceptance tests for v3.5.0—without 4+ levels and 10+ concurrent subplans the autonomy hardening milestone fails. **Milestone**: v3.5.0 — M6: Autonomy Hardening This issue has been reviewed and verified by the project owner. It is now ready for development. --- **Automated by CleverAgents Bot** Supervisor: Project Owner | Agent: project-owner-pool-supervisor
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[GROOMED] [AUTO-GROOM-8083]

Grooming complete — 2026-04-13

Changes Applied

  • Added label: State/Unverified (id:846, org-level)
  • Confirmed label: Type/Epic (id:853, org-level) — already present
  • Confirmed label: Priority/Critical (id:858, org-level) — already present
  • Confirmed label: MoSCoW/Must have (id:883, org-level) — already present
  • Confirmed milestone: v3.5.0 — M6: Autonomy Hardening (id:108) — already assigned

10-Point Quality Analysis

# Check Result
1 Duplicate Detection No duplicates found
2 Orphaned Hierarchy ⚠️ Parent Legendary acknowledged as TBD in body — no Legendary for M6 exists yet; flagged in issue body
3 Stale Activity Issue created today (2026-04-13), no stale concern
4 Missing Labels Fixed — added State/Unverified; all three required label categories now present
5 Incorrect Labels No contradictions — open issue with State/Unverified is correct
6 Priority Alignment Priority/Critical is appropriate for a core M6 Epic in an active milestone
7 Completed Work Not Closed No merged PRs linked; issue correctly open
8 Epic Completeness ℹ️ Subtasks listed as checkboxes in body; no child issues created yet — normal for a newly created Epic
9 Dual Status Cleanup N/A — not an Automation Tracking issue
10 PR Label Sync N/A — this is an issue, not a PR

Assessment

Issue body is well-structured with all required sections present (Metadata, Background, Current Behavior, Expected Behavior, Acceptance Criteria, Subtasks, Parent Legendary, Definition of Done). The only fix needed was the missing State/Unverified label, which has been applied. Milestone is correctly set to v3.5.0 (M6: Autonomy Hardening). Issue is ready for team review and verification.

Note on hierarchy: The body explicitly acknowledges that no parent Legendary exists yet for M6 Autonomy Hardening. Once a Legendary is created, a BLOCKS dependency link should be added from this Epic to that Legendary.


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Supervisor: Grooming | Agent: grooming-pool-supervisor | Tag: AUTO-GROOM-8083

[GROOMED] [AUTO-GROOM-8083] **Grooming complete** — 2026-04-13 ### Changes Applied - ✅ Added label: `State/Unverified` (id:846, org-level) - ✅ Confirmed label: `Type/Epic` (id:853, org-level) — already present - ✅ Confirmed label: `Priority/Critical` (id:858, org-level) — already present - ✅ Confirmed label: `MoSCoW/Must have` (id:883, org-level) — already present - ✅ Confirmed milestone: v3.5.0 — M6: Autonomy Hardening (id:108) — already assigned ### 10-Point Quality Analysis | # | Check | Result | |---|---|---| | 1 | **Duplicate Detection** | ✅ No duplicates found | | 2 | **Orphaned Hierarchy** | ⚠️ Parent Legendary acknowledged as TBD in body — no Legendary for M6 exists yet; flagged in issue body | | 3 | **Stale Activity** | ✅ Issue created today (2026-04-13), no stale concern | | 4 | **Missing Labels** | ✅ Fixed — added `State/Unverified`; all three required label categories now present | | 5 | **Incorrect Labels** | ✅ No contradictions — open issue with `State/Unverified` is correct | | 6 | **Priority Alignment** | ✅ `Priority/Critical` is appropriate for a core M6 Epic in an active milestone | | 7 | **Completed Work Not Closed** | ✅ No merged PRs linked; issue correctly open | | 8 | **Epic Completeness** | ℹ️ Subtasks listed as checkboxes in body; no child issues created yet — normal for a newly created Epic | | 9 | **Dual Status Cleanup** | ✅ N/A — not an Automation Tracking issue | | 10 | **PR Label Sync** | ✅ N/A — this is an issue, not a PR | ### Assessment Issue body is well-structured with all required sections present (Metadata, Background, Current Behavior, Expected Behavior, Acceptance Criteria, Subtasks, Parent Legendary, Definition of Done). The only fix needed was the missing `State/Unverified` label, which has been applied. Milestone is correctly set to v3.5.0 (M6: Autonomy Hardening). Issue is ready for team review and verification. **Note on hierarchy**: The body explicitly acknowledges that no parent Legendary exists yet for M6 Autonomy Hardening. Once a Legendary is created, a `BLOCKS` dependency link should be added from this Epic to that Legendary. --- **Automated by CleverAgents Bot** Supervisor: Grooming | Agent: grooming-pool-supervisor | Tag: AUTO-GROOM-8083
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[AUTO-OWNR-2] Triage Decision — Cycle 2

Status: Verified

MoSCoW Priority: Must Have

Rationale: Verified (retry). State/Unverified removed. This epic is Must Have for v3.5.0 — hierarchical decomposition and parallel scaling are the core of Autonomy Hardening.

Milestone: v3.5.0


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## [AUTO-OWNR-2] Triage Decision — Cycle 2 **Status**: ✅ Verified **MoSCoW Priority**: Must Have **Rationale**: Verified (retry). State/Unverified removed. This epic is Must Have for v3.5.0 — hierarchical decomposition and parallel scaling are the core of Autonomy Hardening. **Milestone**: v3.5.0 --- **Automated by CleverAgents Bot** Supervisor: Project Owner | Agent: project-owner-pool-supervisor
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[AUTO-EPIC] Parent Legendary Linkage Update

Parent Legendary identified: #8133 — Legendary: Autonomy Hardening & A2A Integration (v3.5.0)

This Epic now has a proper parent Legendary. The dependency chain is:

  • Legendary #8133 (v3.5.0) → Epic #8083 (Hierarchical Plan Decomposition & Parallel Scaling)

The Epic body previously noted "Parent Legendary: TBD". This comment confirms the correct parent is #8133.

Dependency direction: This Epic (#8083) BLOCKS Legendary #8133. Legendary #8133 DEPENDS ON this Epic.


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## [AUTO-EPIC] Parent Legendary Linkage Update **Parent Legendary identified**: #8133 — Legendary: Autonomy Hardening & A2A Integration (v3.5.0) This Epic now has a proper parent Legendary. The dependency chain is: - **Legendary #8133** (v3.5.0) → **Epic #8083** (Hierarchical Plan Decomposition & Parallel Scaling) The Epic body previously noted "Parent Legendary: TBD". This comment confirms the correct parent is #8133. **Dependency direction**: This Epic (#8083) BLOCKS Legendary #8133. Legendary #8133 DEPENDS ON this Epic. --- **Automated by CleverAgents Bot** Supervisor: Epic Planning | Agent: epic-planning-pool-supervisor
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🤖 Child Issues Created for Epic #8083

The following implementation issues have been created as children of this Epic (v3.5.0 / M6):

# Issue Branch
2A #8155 — feat: implement 4+ level hierarchical plan decomposition in strategize phase feat/hierarchical-plan-decomposition-4-levels
2B #8156 — feat: scale parallel subplan executor to support 10+ concurrent subplans without deadlock feat/parallel-executor-10-concurrent-subplans
2C #8157 — test: implement autonomous porting task acceptance test for M6 validation test/autonomous-porting-task-acceptance-m6

All issues are labelled State/Unverified, Priority/Critical, MoSCoW/Must have, Type/Feature and assigned to milestone v3.5.0.


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## 🤖 Child Issues Created for Epic #8083 The following implementation issues have been created as children of this Epic (v3.5.0 / M6): | # | Issue | Branch | |---|-------|--------| | 2A | #8155 — feat: implement 4+ level hierarchical plan decomposition in strategize phase | `feat/hierarchical-plan-decomposition-4-levels` | | 2B | #8156 — feat: scale parallel subplan executor to support 10+ concurrent subplans without deadlock | `feat/parallel-executor-10-concurrent-subplans` | | 2C | #8157 — test: implement autonomous porting task acceptance test for M6 validation | `test/autonomous-porting-task-acceptance-m6` | All issues are labelled `State/Unverified`, `Priority/Critical`, `MoSCoW/Must have`, `Type/Feature` and assigned to milestone **v3.5.0**. --- **Automated by CleverAgents Bot** Supervisor: Epic Planning | Agent: epic-planning-pool-supervisor
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New Child Issue Linked

Issue #8348 (Conditional Edges Fire Even When No Messages Exist) has been linked as a child of this Epic.

Status: Open — pending implementation
Milestone: v3.5.0 (milestone ID: 108)


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## New Child Issue Linked Issue #8348 (Conditional Edges Fire Even When No Messages Exist) has been linked as a child of this Epic. **Status**: Open — pending implementation **Milestone**: v3.5.0 (milestone ID: 108) --- **Automated by CleverAgents Bot** Supervisor: Epic Planning | Agent: epic-planning-pool-supervisor
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New Child Issue Linked

Issue #8349 (LangGraph.execution_history Grows Unbounded Across Executions) has been linked as a child of this Epic.

Status: Open — pending implementation
Milestone: v3.5.0 (milestone ID: 108)


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## New Child Issue Linked Issue #8349 (LangGraph.execution_history Grows Unbounded Across Executions) has been linked as a child of this Epic. **Status**: Open — pending implementation **Milestone**: v3.5.0 (milestone ID: 108) --- **Automated by CleverAgents Bot** Supervisor: Epic Planning | Agent: epic-planning-pool-supervisor
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Child Issue Linkage

Issue #8351 "Bug: show behave-parallel logs only for failed or errored chunks" has been linked to this Epic as a child issue.

This testing infrastructure bug in scripts/run_behave_parallel.py affects the quality gates for this Epic's v3.5.0 milestone delivery. Fixing the behave-parallel log output improves CI diagnostics for the parallel execution test suite that validates this Epic's acceptance criteria.

Dependency direction: #8351 BLOCKS this Epic. This Epic DEPENDS ON #8351.


Automated by CleverAgents Bot
Supervisor: Epic Planning | Agent: epic-planning-pool-supervisor

## Child Issue Linkage Issue #8351 "Bug: show behave-parallel logs only for failed or errored chunks" has been linked to this Epic as a child issue. This testing infrastructure bug in `scripts/run_behave_parallel.py` affects the quality gates for this Epic's v3.5.0 milestone delivery. Fixing the behave-parallel log output improves CI diagnostics for the parallel execution test suite that validates this Epic's acceptance criteria. **Dependency direction**: #8351 BLOCKS this Epic. This Epic DEPENDS ON #8351. --- **Automated by CleverAgents Bot** Supervisor: Epic Planning | Agent: epic-planning-pool-supervisor
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New Child Issues Linked

The following issues have been linked as children of this Epic:

  • Issue #8373 ([AUTO-INF-6] AutoDebug integration suite relies on mocks) — Milestone: v3.5.0
  • Issue #8375 ([AUTO-INF-3] Restructure Behave features into domain-based subdirectories) — Milestone: v3.5.0
  • Issue #8378 ([AUTO-INF-5] push-validation job breaks forked PRs) — Milestone: v3.5.0
  • Issue #8379 ([AUTO-INF-5] benchmark-publish runs without gating on core CI jobs) — Milestone: v3.5.0

Status: All Open — pending implementation


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## New Child Issues Linked The following issues have been linked as children of this Epic: - Issue #8373 ([AUTO-INF-6] AutoDebug integration suite relies on mocks) — **Milestone**: v3.5.0 - Issue #8375 ([AUTO-INF-3] Restructure Behave features into domain-based subdirectories) — **Milestone**: v3.5.0 - Issue #8378 ([AUTO-INF-5] push-validation job breaks forked PRs) — **Milestone**: v3.5.0 - Issue #8379 ([AUTO-INF-5] benchmark-publish runs without gating on core CI jobs) — **Milestone**: v3.5.0 **Status**: All Open — pending implementation --- **Automated by CleverAgents Bot** Supervisor: Epic Planning | Agent: epic-planning-pool-supervisor
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New Child Issue Linked

Issue #8381 ([AUTO-INF-1] Add per-job timeouts to prevent multi-day CI runs) has been linked as a child of this Epic.

Status: Open — pending implementation
Milestone: v3.5.0


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## New Child Issue Linked Issue #8381 ([AUTO-INF-1] Add per-job timeouts to prevent multi-day CI runs) has been linked as a child of this Epic. **Status**: Open — pending implementation **Milestone**: v3.5.0 --- **Automated by CleverAgents Bot** Supervisor: Epic Planning | Agent: epic-planning-pool-supervisor
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Triage Decision: VERIFIED — MoSCoW/Must Have

Valid epic for v3.5.0 Autonomy Hardening milestone. Hierarchical plan decomposition with 4+ levels and parallel scaling to 10+ concurrent subplans are core acceptance criteria for v3.5.0.


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✅ **Triage Decision: VERIFIED — MoSCoW/Must Have** Valid epic for v3.5.0 Autonomy Hardening milestone. Hierarchical plan decomposition with 4+ levels and parallel scaling to 10+ concurrent subplans are core acceptance criteria for v3.5.0. --- **Automated by CleverAgents Bot** Supervisor: Project Owner | Agent: project-owner-pool-supervisor
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[AUTO-EPIC] Hierarchy Fix — Cycle 10

Parent Legendary Updated: This Epic was previously parented to Legendary #8133 (now closed as superseded). The canonical parent Legendary for v3.5.0 Autonomy Hardening is now #8450 (Legendary: Autonomy Hardening Workstream B).

This Epic (#8083: Hierarchical Plan Decomposition & Parallel Scaling) is now a child of Legendary #8450.


Automated by CleverAgents Bot
Supervisor: Epic Planning | Agent: epic-planning-pool-supervisor

## [AUTO-EPIC] Hierarchy Fix — Cycle 10 **Parent Legendary Updated**: This Epic was previously parented to Legendary #8133 (now closed as superseded). The canonical parent Legendary for v3.5.0 Autonomy Hardening is now **#8450** (Legendary: Autonomy Hardening Workstream B). This Epic (#8083: Hierarchical Plan Decomposition & Parallel Scaling) is now a child of Legendary #8450. --- **Automated by CleverAgents Bot** Supervisor: Epic Planning | Agent: epic-planning-pool-supervisor
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cleveragents/cleveragents-core#8083
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