vscode-cowriting-plugin/sessions/0004/SESSION-0004.0-TRANSCRIPT-2026-06-10T06-38--2026-06-10T07-04.md

Session 0004.0 — Transcript

App: vscode-cowriting-plugin Start: 2026-06-10T06-38 (PST) Type: planning-and-executing End: 2026-06-10T07-04 (PST) Type: planning-and-executing Status: FINALIZED.

Driver session for Feature #4 (F2 — region-anchored threads): wrote the just-in-time plan from the graduated coauthoring-inner-loop spec and executed all five slices. Shipped to main via Gitea PR #5.

Launch prompt

Build F2 (#4) — region-anchored threads in a planning-and-executing session: write the just-in-time plan from vscode-cowriting-plugin-content/specs/coauthoring-inner-loop.md (§7.2 SLICE-1..5: CoauthorStore → Anchorer → ThreadController via the Comments API → reload/external re-anchor → @vscode/test-electron E2E) and execute it. UI surface ⇒ E2E host tests are first-class plan tasks. No live @cline/sdk turn / no provider-auth in F2.

Plan

Implementing the coauthoring inner-loop spec (graduated, session 0003), first consumer F2 (#4): region-anchored discussion threads on the POC skeleton (#2).

Slices (spec §7.2), each a plan task:

• SLICE-1 Artifact schema (schemaVersion, shared anchors/provenance, threads) + CoauthorStore (load/save .threads/ sidecars, stable key ordering, round-trip tests). [vscode-free, vitest]
• SLICE-2 Anchorer — buildFingerprint, resolution ladder (exact-unique → context-disambiguated via lineHint → orphaned), live offset shift. [vscode-free, vitest]
• SLICE-3 ThreadController wiring to vscode.comments (create-on-selection, reply, resolve, render). [editor-facing]
• SLICE-4 Reload + external-change re-anchoring (FileSystemWatcher) + orphaned-thread surface.
• SLICE-5 E2E (@vscode/test-electron) across create→persist→reload→re-anchor; fall back to driving the ThreadController API + asserting Comments-controller state where the harness cannot drive native Comments UI.

Invariants: never silently move a thread (orphan instead, INV-1); git-native serverless JSON (INV-2); fingerprint is source of truth (INV-3); forward-compatible envelope for F3–F5 (INV-4); no live @cline/sdk turn / no credentials (INV-5). Done = F2 acceptance met, unit + host E2E green.

Plan doc: docs/superpowers/plans/2026-06-10-f2-region-anchored-threads.md (archived to vscode-cowriting-plugin-content/plans/).

Session arc

Pre-state: clean origin/main at the POC skeleton (#2, sessions 0002/0003). Spec coauthoring-inner-loop.md graduated in brainstorming session 0003.

1. Claim + orient — claimed session 0004; read the spec (§6 design, §7.2 slices) and the POC skeleton (vscode-free cline.ts, esbuild CJS bundle with vscode/@cline/sdk external). Memory confirmed F2/#4 as next.
2. Plan — wrote the just-in-time plan with superpowers:writing-plans: six tasks (SLICE-1..5 + README/verify), every step with complete code and TDD grain, E2E host tests as first-class tasks. Branched feat/f2-region-anchored-threads.
3. Execute with superpowers:executing-plans, inline (tasks are type-dependent, not independent):
   • SLICE-1 model.ts (schema + stable serialize) + store.ts — 8 unit tests.
   • SLICE-2 anchorer.ts (fingerprint, ladder, shift) — 9 unit tests.
   • SLICE-3 threadModel.ts (4 tests) + threadController.ts + package.json contributions + extension.ts API. Typecheck caught CommentThread.range being optional → guarded.
   • SLICE-4 reload/watcher/orphan mechanics (built in S3) + reanchor.test.ts.
   • SLICE-5 @vscode/test-electron host E2E. Two iterations: mocha UI mismatch (bdd→tdd), then the external-change test needed files.revert because openTextDocument serves the cached buffer. 4/4 host tests green vs VS Code 1.124.0.
4. Ship — full sweep green (typecheck, 24 unit, build, 4 E2E). Pushed branch, opened Gitea PR #5 via API, merged (autonomous), synced main, pruned branch.

Cut state: main clean & pushed; F2 shipped; 24 unit + 4 host E2E green; plan archived; memory updated.

Deferred decisions

• CoauthorStore is vscode-free (Node fs); the FileSystemWatcher lives in ThreadController, not in the store. Spec §6.2/§6.4 lists the watcher under CoauthorStore ("emits onExternalChange") yet also calls the store one of the three vscode-free, unit-testable units. Those pull apart — a FileSystemWatcher is a vscode API. Resolved in favor of testability (the spec's stated reason for vscode-free): the store does pure load/save (unit-tested), and the watcher → reload → re-render wiring sits in the controller and is covered by host E2E. Alternative was a vscode-free event emitter on the store with the watcher injected — more indirection for no test benefit. Low-stakes; flagging for spec alignment when F3/F4 touch the store.