---
docType: review
layer: project
reviewType: slice
slice: pipeline-state-and-resume
project: squadron
verdict: PASS
sourceDocument: project-documents/user/slices/150-slice.pipeline-state-and-resume.md
aiModel: moonshotai/kimi-k2.5
status: complete
dateCreated: 20260403
dateUpdated: 20260403
---

# Review: slice — slice 150

**Verdict:** PASS
**Model:** moonshotai/kimi-k2.5

## Findings

### [PASS] State file schema alignment

The slice implements the exact JSON schema structure defined in the architecture: `schema_version`, `run_id`, `pipeline`, `params`, `started_at`, `status`, `current_step`, `completed_steps`, and `checkpoint` fields. The storage location `~/.config/squadron/runs/` matches the architecture specification precisely.

### [PASS] Proper layer separation

The document correctly identifies this as a "library only — no CLI surface" and defers `sq run --resume` wiring to slice 151. This aligns with the architecture's component diagram showing State Manager as an internal executor component, while the CLI is a separate outer layer.

### [PASS] Correct dependency boundaries

The slice consumes the executor's `on_step_complete` callback mechanism and `execute_pipeline` with `start_from` parameter from slice 149, and provides the `StateManager` interface to slice 151. This matches the architecture's data flow where the executor invokes state updates via callbacks.

### [PASS] Appropriate scope exclusion

The document explicitly excludes conversation persistence (160 scope), state migration between schema versions (160+ scope), and interactive checkpoint UX (slice 146 scope). This aligns with the architecture's 140/160 initiative split and scope boundaries.

### [PASS] Resume modes implementation

The slice implements the three resume modes mentioned in the architecture: explicit resume (`--resume <run-id>` via `load()` and `load_prior_outputs()`), mid-process adoption (`--from <step>` via `first_unfinished_step()`), and implicit resume detection (`find_matching_run()`).

### [PASS] Pruning implementation

The architecture mentions "Old runs can be pruned" as a storage consideration. The slice specifies an automatic pruning strategy (per-pipeline, keep=10, paused runs preserved) that satisfies this requirement without scope creep.

### [PASS] Atomic write safety

The slice specifies write-then-rename atomic writes for state file updates, which correctly addresses the data integrity risk inherent in frequent state updates after every step completion mentioned in the architecture.
