Files
temp/docs/reference/large_project_decomposition.md
freemo 4232907ab9 feat(plan): add large-project decomposition and dependency closure
Add hierarchical decomposition with 4+ levels and bounded context per
subplan. Implement decomposition heuristics (max_files_per_subplan,
max_tokens_per_subplan, language/dir clustering). Add dependency closure
computation for large graphs and DAG execution ordering. Add bounded
dependency closure with cutoff thresholds and memoization for 10K+
files. Record decomposition decisions in DecisionService
(strategy_choice + subplan_spawn entries).

New modules:
- decomposition_models.py: DecompositionConfig, DecompositionNode,
  DecompositionResult, DependencyEdge, DependencyGraph
- decomposition_clustering.py: ClusteringStrategy with directory,
  language, and size clustering plus deterministic sort
- decomposition_graph.py: DependencyClosureComputer with bounded
  closure, topological sort, cycle detection, and memoization
- decomposition_service.py: DecompositionService orchestrating
  hierarchy building and decision recording

Settings: planner_max_depth, planner_max_files_per_subplan,
planner_max_tokens_per_subplan, planner_min_files_per_subplan

Closes #205
2026-03-03 21:44:20 +00:00

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# Large-Project Decomposition
## Overview
The large-project decomposition subsystem breaks large file sets into bounded
subplans suitable for independent execution. It provides hierarchical
decomposition with 4+ levels, clustering heuristics, dependency closure
computation, and DAG execution ordering.
## Configuration
| Setting | Default | Description |
|---------|---------|-------------|
| `planner_max_depth` | 4 | Maximum recursion depth |
| `planner_max_files_per_subplan` | 500 | Upper file count per leaf |
| `planner_max_tokens_per_subplan` | 100000 | Upper token count per leaf |
| `planner_min_files_per_subplan` | 10 | Threshold below which decomposition is skipped |
## Clustering Strategies
Three complementary strategies partition files into bounded clusters:
- **Directory** — Groups files by common directory prefix. Splits oversized
buckets into chunks of `max_files_per_subplan`.
- **Language** — Groups files by file extension. Useful for polyglot projects.
- **Size** — Groups files by cumulative estimated token count.
A deterministic sort ensures clusters are always produced in the same order.
## Dependency Closure
`DependencyClosureComputer` computes bounded transitive closures on file
dependency graphs:
- `compute_closure(graph, roots, cutoff)` — BFS forward closure with optional
size limit. Results are memoised for repeated queries.
- `topological_sort(graph)` — Kahn's algorithm for DAG execution ordering.
- `detect_cycles(graph)` — DFS colouring to find elementary cycles.
## Decision Recording
`DecompositionService.record_decisions()` persists two types of decisions:
1. `strategy_choice` — The overall decomposition strategy.
2. `subplan_spawn` — One per leaf node in the decomposition tree.
## API
```python
from cleveragents.application.services.decomposition_service import (
DecompositionService,
)
from cleveragents.application.services.decomposition_models import (
DecompositionConfig,
)
svc = DecompositionService(decision_service=ds)
result = svc.decompose(files, DecompositionConfig(max_depth=4))
svc.record_decisions(plan_id, result)
```
## Related
- [Subplan Service](subplan_service.md)
- [Decision Service](decision_service.md)
- Forgejo issue #205