vscode-cowriting-plugin/sessions/0007/SESSION-0007.0-TRANSCRIPT-2026-06-10T09-21--2026-06-10T11-14.md

# Session 0007.0 — Transcript

> App: vscode-cowriting-plugin
> Start: 2026-06-10T09-21 (PST) · End: 2026-06-10T11-14 (PST)
> Type: planning-and-executing
> Driver: Claude (Opus 4.8), autonomous posture · Operator: Ben Stull

## Launch prompt

```
Build F3 (#6) — live human/Claude attribution — in a planning-and-executing session: write the just-in-time plan from vscode-cowriting-plugin-content/specs/coauthoring-attribution.md (§7.2 SLICE-1..6) and execute it on the F2 model. Host E2E drives the applyAgentEdit seam (no LLM in CI); the live claude-code turn gets a documented manual smoke.
```

## Pre-state

- `main` at `8d406a8` → fast-forwarded to `9c7860a` (session-history commits
  only); tree clean. Session 0005 in flight (`--INPROGRESS`, not adopted —
  noted, proceeded per autonomous concurrency rule; F3 was 0006's designated
  next step so overlap risk was judged low).
- Spec `coauthoring-attribution.md` graduated by session 0006; pulled into the
  local content clone (`62fe685..b7637d9`).
- Anchor: Feature #6 with graduated Solution Design — §3.4 gate satisfied.

## Arc (turn-by-turn)

1. **Init** — claimed session 0007 (placeholder `9c7860a`), verified clean
   baseline, confirmed memory resume pointer == launch goal.
2. **Grounding** — read the F3 spec + the full F2 surface (model / anchorer /
   store / threadController / extension / E2E harness). Probed installed
   `@cline/sdk` 0.0.46 directly + via an Explore subagent: `Agent` runtime,
   `claude-code` ∈ `BUILT_IN_PROVIDER_IDS`, modelIds sonnet/opus/haiku,
   `AgentRunResult.runId`.
3. **Plan** (superpowers:writing-plans) — wrote
   `docs/superpowers/plans/2026-06-10-f3-live-attribution.md`: Tasks 0–8 over
   SLICE-1..6 with full code, shared design rules (edit normalization, span
   algebra, sidecar co-ownership via `store.update`), verified-SDK-facts
   header. Seeded the placeholder's `## Plan` block.
4. **Execution** (superpowers:subagent-driven-development, branch
   `feat/f3-live-attribution`; every task two-stage reviewed — spec compliance
   then quality — with fix→re-review loops):
   - **T1+2 (SLICE-1/2)** `4afe97c`,`363fd09` — typed `AttributionRecord` +
     tracker span algebra; 44/44 unit. Approved.
   - **T3 (SLICE-3a)** `decdfbf` — `PendingEditRegistry` +
     `CoauthorStore.update` section merge; ThreadController.persist refactor;
     49/49. Review surfaced two forward risks → plan **Amendment 1** (shared
     watcher + store-level self-writes + unconditional unregister).
   - **T4+5 (SLICE-3b/4)** `d05cb0f`,`4b27acf` — AttributionController (seam,
     tracking, decorations, toggle, save/load/orphan, status bar) per
     Amendment 1; persistence decision-logic tests; 56/56. Quality review
     demanded fixes → `20b709f` (counted self-writes Map, deletion-to-empty
     persistence via `hadAttributions`, render-all-visible-editors, defensive
     change ordering). Re-review approved.
   - **T6 (SLICE-5)** `c08dc07` — `liveTurn.ts` (`Agent`, claude-code,
     sonnet), `cowriting.editSelection`, ESM smoke entry + script, manual
     smoke doc. Deviation (correct): SDK success status is `"completed"`, not
     the plan's `"success"`. **Live smoke PASSED on this machine**
     (`run_g_rYKGYl`, 6.9s) — §7.3's "smoke performed once" met. Failure-path
     attempts could not simulate sign-out (SDK discovers the install under
     `~/.local/share/claude/versions/…` despite PATH/symlink hiding) — doc
     corrected to observed reality (`258d1fa`). Review fixes `fe23ffa`
     (fence-aware extraction keyed on the selection; editSelection scheme +
     re-check guards; empty-replacement guard).
   - **T7 (SLICE-6)** — host E2E BLOCKED first run, exposing **two real
     host-only product bugs** invisible to units: (a) change events arrive
     before the dirty flag flips, so `isDirty` misclassified first edits as
     disk syncs; (b) VS Code diff-minimizes WorkspaceEdits, so the seam's
     exact-match missed and agent edits mis-attributed to the human (INV-9
     break). Plan **Amendment 2** → fixes `2604ab4` (disk-compare sync
     detection; self-minimized seam edits with intent-honest full-extent
     attribution); E2E suite committed `fc5fde1`; 9/9. Hardening `41b1cb4`
     (observable seam misses, cheaper disk compare, ordering notes).
   - **Ship prep** — README `644e7b7`; final whole-branch review (spec §8
     traceability walked row-by-row: all delivered; ready-to-merge yes);
     polish `d851942` (active-editor status bar; E2E for the command wrapper +
     toggle, PUC-5); plan committed `9deb1f7`.
5. **Ship** — pushed; **PR #7** created and merged
   (`7509120`); **issue #6 auto-closed**. Post-merge full gate on `main`:
   typecheck clean · vitest **69/69** · both bundles · host E2E **10/10**
   (F2 4/4 + F3 6/6). Branch deleted local+remote.
6. **Finalize** — plan archived to content `plans/` (`8d9e86c`); memory
   updated (`f3-live-attribution-shipped` + index); this transcript published.

## Pipeline status (§9)

Localhost + E2E: green (the suites above). This app is a non-shippable VS Code
extension POC — no PPE/prod stages exist and nothing deploys; the live-turn tier
is covered by the documented manual smoke instead of CI (spec §6.8/§7.3).

## Deferred decisions

_Autonomous-mode low-confidence calls the driver made and would have
liked operator input on. Appended as the session runs; surfaced at
finalize. Empty if none._

- **Self-write suppression = counted Map, accepting the watcher-coalescing
  caveat.** One save can write the sidecar twice (Thread + Attribution
  controllers); chose a per-path write counter consumed per watcher event. If
  VS Code coalesces the two write events into one, a count strands and the
  next genuine external change is suppressed once (inverse of the old Set's
  leak). Judged acceptable for F3 over a TTL/timestamp scheme; revisit if
  thread-UI flicker or missed reloads surface in practice.
- **Span-id stability across coalesce not guaranteed.** When an inserted span
  merges with a persisted one, the earlier-by-offset span's id wins; a lost
  persisted id just means a fresh anchor on next save (sidecar diff churn,
  no correctness impact). Left as-is per reviewer triage.
- **Agent spans use intent-honest extent.** VS Code diff-minimizes
  WorkspaceEdits, so the seam self-minimizes for transport but attributes the
  agent's FULL intended replacement (incl. chars coinciding with prior text).
  Ratified against PUC-2 ("the machine edit lands Claude-attributed" — the
  turn's replacement is the unit); the alternative (transport-narrow spans)
  would tint only the diff of a rewrite, which reads as noise.
- **Disk-compare sync detection** replaces the `isDirty` heuristic (host
  delivers change events before flipping the dirty flag): a `!isDirty` change
  whose buffer equals disk = sync (re-resolve); otherwise attribute. Sync
  read of the file on those rare events accepted.

## Cut state

- `main` = `origin/main` = `7509120`; tree clean; feature branch deleted;
  Epic #1 the only open issue. Known minor non-blockers (final review):
  non-UTF-8 revert misclassification (fail-open direction), undo-of-agent-edit
  attributes restored text to the human (defensible; note for F4),
  `engines.vscode` 1.90 vs node22 target (cosmetic).
- Artifacts: spec (content `specs/coauthoring-attribution.md`, graduated) ·
  plan (content `plans/2026-06-10-f3-live-attribution.md`, archived, also in
  repo `docs/superpowers/plans/`) · smoke log (`docs/MANUAL-SMOKE-F3.md`).

## Operator plate

- Nothing required. Optional: exercise the signed-out live-turn failure path
  on a machine without Claude Code (the one smoke row not executable from
  inside a live session); react to the four deferred decisions above if any
  reads wrong.

## Next-session prompt

```
/goal Capture Feature F4 (propose/accept on the applyAgentEdit seam, per coauthoring-inner-loop.md §9 OPEN→F4 and coauthoring-attribution.md §9) as a typed issue under Epic #1 on benstull/vscode-cowriting-plugin, then brainstorm its Solution Design spec in a follow-up session.
```