add sessions/0017/SESSION-0017.0-TRANSCRIPT-2026-06-10T23-52--2026-06-11T06-59.md + replace placeholder/variant SESSION-0017.0-TRANSCRIPT-2026-06-10T23-52--INPROGRESS.md
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Ben Stull
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# Session 0017.0 — Transcript
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> App: vscode-cowriting-plugin
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> Date: 2026-06-10T23-52 → 2026-06-11T06-59 (PST)
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> Type: brainstorming
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> Goal: Brainstorm Feature #17 (diff-view toggle) into its Solution Design —
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> the baseline fork (turn start / last accept / save / pinned) is the
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> load-bearing decision; constraints and non-goals in the issue body.
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> Outcome: **Spec graduated** — content `specs/coauthoring-diff-view.md`
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> (F6, v0.1.0, commit `36bc4e3`). All forks resolved; INV-18/INV-19 added.
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## Launch prompt
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```
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/goal Brainstorm Feature #17 (diff-view toggle) into its Solution Design — the baseline fork (turn start / last accept / save / pinned) is the load-bearing decision; constraints and non-goals are in the issue body
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```
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## Plan
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Brainstorm Feature #17 (diff-view toggle) into its Solution Design.
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- Read issue #17 (constraints + non-goals in the body) and the existing
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F2–F5 specs/code as input.
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- Work the load-bearing decision first: the **baseline fork** — what the
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diff view diffs *against* (turn start / last accept / save / pinned).
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- Explore the remaining design forks, write the Solution Design under the
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content repo's `specs/`, graduate it at finalize (autonomous default).
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## Pre-session state
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- `main` at `611a180` (PR #16 — proposal threads decide-only fix), in sync
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with origin. Epic #1 fully shipped (F2 #4 · F3 #6 · F4 #12 · F5 #14).
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- One dirty file: `sandbox/playground.md` — a 1-line accidental truncation
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("thre" for "thread") left from the operator's manual play before this
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session. Noted at init; restored at finalize.
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- Memory resume pointer (f5-cross-rung-shipped): "Next /goal: Brainstorm
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Feature #17 …" — exactly this session's goal.
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- No other in-flight sessions; claim of 0017 was uncontended.
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## Turn-by-turn arc
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1. **Init** — classified the `/goal` as brainstorming; claimed session 0017
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(`--type brainstorming`, start 2026-06-10T23-52); seeded the Plan block;
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verified the CLAUDE.md org-context import; confirmed the baseline
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(noting the playground stray); resolved app facts (roadmap = this repo;
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content = `vscode-cowriting-plugin-content`; **no BDD corpus** — nothing
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to consume as gherkin input).
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2. **Anchor gate** — fetched issue #17 from Gitea (`gitea-api.sh`,
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git.benstull.org): `type/feature`, P2, constraints + firm non-goals in
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the body. Eligible brainstorming anchor (R3: a feature produces its
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design first).
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3. **Context exploration** — read the F4 spec (`coauthoring-propose-accept.md`)
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as the form reference, plus `model.ts`, `liveTurn.ts`,
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`proposalController.ts`, `extension.ts`, `store.ts`, and the seam
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(`attributionController.ts:232`). The decisive structural fact:
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**INV-9 + INV-10 mean the machine writes the document only through
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`applyAgentEdit`, only at accept time — so between machine landings,
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every buffer change is operator-authored.**
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4. **The baseline fork (load-bearing)** — resolved to a
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**machine-landing–anchored auto-baseline + human pin**: initialize at
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first track, advance on every successful seam application; the diff is
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operator-authored *by construction* (new **INV-18**). The issue's other
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candidates fell away on the merits: turn-start collapses into accept
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under F4's propose-by-default (the document doesn't change at turn
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start); last-save duplicates native compare-with-saved/local-history;
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fixed session-start mixes machine landings in; a multi-baseline selector
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is YAGNI (pin covers the operator-chosen epoch).
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5. **Secondary forks** — snapshot home = extension workspace storage via a
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vscode-free `BaselineStore`, never the sidecar (**INV-19**: no
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cross-rung contract impact, no `.threads/` churn); whose-changes =
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whole-document diff, no F3 filtering (state-not-history); view primitive
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= native `vscode.diff` with readonly `cowriting-baseline:` left and the
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**live document** right (editing continues in the diff view); landing
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signal = one additive `AttributionController.onDidApplyAgentEdit` event
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(one ingress → one signal); keybinding `ctrl+alt+d`.
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6. **Spec written** — `coauthoring-diff-view.md` (F6), the full Solution
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Design form (handbook §3.3, F4/F5 precedent): BUC/PUC, INV-18/19,
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architecture (BaselineStore + DiffViewController + seam event),
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alternatives table, testing strategy (unit + host E2E, no LLM), failure
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modes (stale-epoch states are visible and pin-recoverable), 4-slice
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delivery plan, traceability to #17's acceptance.
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7. **Self-review** — placeholder/consistency/scope/ambiguity pass; one fix
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(named `renderIfOpen` as the `ensureBaseline` hook).
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8. **Finalize** — restored the playground stray; submitted the spec
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`--status graduated` (autonomous default) → content commit `36bc4e3`;
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synced the local content clone; memory updated
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(`f6-diff-view-spec-graduated` + index; cleared the stale Next /goal in
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`f5-cross-rung-shipped`); published this transcript.
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No wrong turns of substance this session; the one mid-course correction was
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realizing publication of the spec belongs to finalize's `submit-spec.sh`
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(not a hand commit/PR), and authoring the spec directly in the content
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repo's working tree as its canonical home.
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## Deferred decisions
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_Autonomous-mode low-confidence calls the driver made and would have
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liked operator input on. Surfaced at finalize._
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- **Absorb-on-advance semantics** (spec §6.7): the baseline advances to a
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whole-document snapshot at each machine landing, so operator edits made
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*before* an accept disappear from the diff ("my changes since the machine
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last landed", not "my whole session"). The alternative — splicing the
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accepted replacement into the baseline so older operator edits stay
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visible — was deferred as an additive refinement (murky edge cases when
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the machine edits operator-authored-since-baseline text). Confident in
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the invariant (INV-18 holds either way); less confident the absorb
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semantics match operator intuition — pin + the epoch-naming diff title
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are the mitigations.
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- **Default keybinding `ctrl+alt+d`** for `cowriting.toggleDiffView`
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(spec §6.7): chosen over `cmd+alt+d` (macOS Dock toggle) and `cmd+k d`
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(taken by compare-with-saved); cheap to change.
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- **Spec authored directly in the content repo working tree**
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(`vscode-cowriting-plugin-content/specs/coauthoring-diff-view.md`) — its
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canonical home — rather than a scratch `specs/` dir in the plugin repo;
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finalize's `submit-spec.sh` publishes from that path.
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- **Restored `sandbox/playground.md`** at finalize (discarded the 1-line
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pre-session truncation, restoring the committed text) — judged stray
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damage from manual play, not work; flagged here since discarding an
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operator working-tree edit is not reversible.
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## Cut state (end of session)
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| Repo | State |
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| --- | --- |
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| `vscode-cowriting-plugin` | `main` @ `611a180`, clean, in sync (playground stray restored; no code changes this session) |
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| `vscode-cowriting-plugin-content` | `main` @ `36bc4e3` — **specs/coauthoring-diff-view.md added (status: graduated)**; local clone synced; 4 untracked `issues/*.md` capture drafts remain (Author's to publish) |
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| session-history (`sessions/0017/`) | this transcript, published at finalize |
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- Issue #17: open, unchanged — the spec is its design artifact; the issue
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closes when F6 ships.
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- Nothing implemented yet: F6 is spec-only as of this session.
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## What lands on the operator's plate
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- **Review the graduated spec** (autonomous mode skipped the review gate):
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`/Users/benstull/git/benstull.org/benstull/vscode-cowriting-plugin-content/specs/coauthoring-diff-view.md`
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— especially the two deferred calls above (absorb-on-advance semantics;
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`ctrl+alt+d`).
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- The four untracked `issues/*.md` drafts in the content repo are still
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yours to commit/publish or discard (capture-session convention).
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## Prompt the operator can paste into the next session
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```
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/goal Plan and execute Feature #17 (F6 diff-view toggle) from the graduated Solution Design at content specs/coauthoring-diff-view.md — 4 slices per §7.2, host-E2E tier, no LLM in CI
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```
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@@ -1,23 +0,0 @@
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# Session 0017.0 — Transcript
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> App: vscode-cowriting-plugin
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> Start: 2026-06-10T23-52 (PST)
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> Type: brainstorming
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> Status: **PLACEHOLDER — claimed at session start; finalized at session end.**
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>
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> This file reserves session ID 0017 for vscode-cowriting-plugin. The driver replaces this
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> body with the full transcript and renames the file to its final
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> SESSION-0017.0-TRANSCRIPT-2026-06-10T23-52--<end>.md form at session end.
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## Launch prompt
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```
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/goal Brainstorm Feature #17 (diff-view toggle) into its Solution Design — the baseline fork (turn start / last accept / save / pinned) is the load-bearing decision; constraints and non-goals are in the issue body
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```
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## Deferred decisions
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_Autonomous-mode low-confidence calls the driver made and would have
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liked operator input on. Appended as the session runs; surfaced at
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finalize. Empty if none._
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