# S01 Assessment — Roadmap Reassessment

## Verdict: No changes needed

S01 delivered exactly what the boundary map specified. The persistent process reliability risk is retired — 120 sequential commands with ID matching, 8 malformed JSON recovery scenarios, clean shutdown on EOF. R001 and R032 validated.

## Coverage Confirmation

All 7 success criteria have at least one remaining owning slice:

- Edit by symbol name → S02, S05, S06
- Outline → S03
- Zoom with caller/callee → S03
- Checkpoint/restore → S04
- Undo → S04
- JSON stdin/stdout (validated by S01)
- npm install distribution → S07

## Boundary Map Check

S01 produced all artifacts the boundary map promised: `main.rs` process loop, `protocol.rs` with RawRequest/Response, `error.rs` with five AftError variants, `language.rs` with LanguageProvider trait + StubProvider, `config.rs` with runtime defaults. The two-stage parsing pattern (D010) and NDJSON protocol (D009) are established. S02 can consume these interfaces without adjustment.

## Requirement Coverage

- R001 (persistent binary): validated
- R032 (structured JSON I/O): validated
- R031 (LSP-aware architecture): partially validated (trait defined, full validation deferred to M004/S03)
- All other active requirements remain correctly mapped to their owning slices

## Risks

- No new risks surfaced
- Tree-sitter accuracy risk remains for S02 (as planned)
- Cross-compilation risk remains for S07 (as planned)

## Notes

- D011 (persistent BufReader for integration tests) is a useful pattern for S02+ test authoring
- The match dispatch in main.rs will grow linearly but is fine through S05; registry pattern noted as optional future improvement
