my-pi/pi-permission-system/docs/retro/0527-delete-dead-yolo-arms.md

issue, issue_title

issue	issue_title
527	pi-permission-system: delete dead yolo arms from the prompt path; dissolve yolo-mode.ts

Retro: #527 — delete dead yolo arms from the prompt path; dissolve yolo-mode.ts

Stage: Planning (2026-07-05T00:00:00Z)

Session summary

Planned Phase 8 Step 3: a pure narrowing that deletes the two unreachable yolo branches Step 2 (#526) left behind (the PermissionPrompter auto-approve arm and PromptingGateway.canConfirm()'s yolo arm), dissolves src/yolo-mode.ts by moving isYoloModeEnabled into extension-config.ts, and drops the now-dead config dependency from PermissionPrompterDeps and PromptingGatewayDeps. The plan is four commits (three refactor: cycles plus a docs: completion commit) and is the tail of the "yolo-recorded-authority" release batch, so it ships now.

Observations

• The issue text says only "move isYoloModeEnabled"; tracing the two shouldAutoApprovePermissionState call sites showed the prompter arm is the only caller passing a variable state — once it is removed, the serve arm always passes "ask", so shouldAutoApprovePermissionState collapses to isYoloModeEnabled and is deleted rather than moved. The serve arm re-points at isYoloModeEnabled (behavior-identical), keeping test/permission-forwarder.test.ts green as the invariant pin.
• Removing the config field from both dependency bags is a dependency-width narrowing, so the design-review checklist confirmed no new structural smell — the fixes are inline, not a follow-up.
• The safety of deleting the prompter arm rests on the exhaustive reachability trace recorded in the #526 retro (no ask reaches the prompter under yolo); cited it in "Invariants at risk" rather than re-deriving it.
• test/yolo-mode.test.ts is deleted outright: its two subjects are removed, and its lone resolvePermissionForwardingTargetSessionId assertion duplicates an existing case in test/permission-forwarding.test.ts ("isSubagent=true, no candidates set returns null"), so no relocation is needed.
• Doc sweep targets: docs/architecture/architecture.md (module tree line, prompting-gateway.ts description, two metric rows, Step 3 ✅ marker + Mermaid node) and docs/architecture/permission-prompter.md (the #526 retro flagged this one rides with #527). No README.md command-surface change.

Stage: Implementation — TDD (2026-07-05T00:00:00Z)

Session summary

Executed all four planned commits: removed PermissionPrompter's dead auto-approve arm, reduced PromptingGateway.canConfirm() to hasUI ∨ isSubagent and deleted canResolveAskPermissionRequest/AskPermissionResolutionOptions, dissolved src/yolo-mode.ts (moved isYoloModeEnabled into extension-config.ts, deleted shouldAutoApprovePermissionState, re-pointed the forwarded-inbox serve arm), then updated architecture.md (Step 3 ✅ marker, Mermaid node, module tree, two metric rows) and permission-prompter.md. Test count moved 2299 → 2283 (removed 4 prompter yolo tests, 1 gateway yolo test, 8 yolo-mode.test.ts tests; added 3 isYoloModeEnabled tests in extension-config.test.ts). The pre-completion-reviewer returned PASS on the first dispatch.

Observations

• No deviations from the plan — all four TDD steps landed exactly as designed, including the dependency-bag narrowing (config dropped from both PermissionPrompterDeps and PromptingGatewayDeps) and the serve-arm re-point to isYoloModeEnabled with the Phase 9 retention comment.
• Followed the plan's metrics-table guidance by prefixing ✅ on the Target-column values for "yolo checks on the ask path" and "canConfirm() predicates" (matching the precedent in docs/architecture/history/phase-7-accesspath-universal-representation.md) rather than mutating the frozen "Phase 7 close" baseline column.
• The test/permission-forwarder.test.ts serve-arm test needed no edit — confirmed the plan's claim that isYoloModeEnabled is behavior-identical to the old shouldAutoApprovePermissionState("ask", …) call it replaced.
• Pre-completion reviewer: PASS. Reviewer warnings: one non-blocking note — architecture.md's "Target: the authority model" section (~line 500) still names yolo-mode.ts in a "today these concerns are spread across…" sentence; this was outside the plan's declared doc-sweep scope (module tree, Step 3 marker, two metric rows, permission-prompter.md) and is left for a future spine-related doc pass.
• Batch status: this is the tail of "yolo-recorded-authority" (Steps 2, 3) — /ship-issue should now merge the release-please PR left open by #526's mid-batch — defer marker.

Stage: Final Retrospective (2026-07-06T00:45:00Z)

Session summary

Shipped Phase 8 Step 3 across three stages (plan, TDD, ship) that ran essentially without rework: the plan matched the implementation exactly (four commits, zero deviations), the pre-completion-reviewer returned PASS on the first dispatch, CI was green on push, and the batch-tail release (pi-permission-system-v18.2.0) merged cleanly, closing both #526 and [#527]. The only friction was three minor, self-caught tool-usage slips in the ship/TDD stages, none of which caused rework or commit churn.

Observations

What went well

• Zero-deviation execution: the plan's four-commit TDD order landed verbatim, the design-review "narrowing" call held (dropping config from PermissionPrompterDeps and PromptingGatewayDeps introduced no smell), and the pre-completion reviewer passed first try. This is the payoff of a plan that did the hard reasoning up front (the reachability trace, the shouldAutoApprovePermissionState-collapses-to-isYoloModeEnabled insight).
• Cross-session context bridge worked as designed: the #526 retro's exhaustive reachability trace ("no ask reaches the prompter under yolo") was cited directly in the plan's "Invariants at risk" and reused by the pre-completion reviewer, so the prompter-arm deletion was never re-litigated.
• Batch-tail release coordination was frictionless: the plan's **Release:** marker drove the ship decision with no operator prompt, and /ship-issue closed both batch members (#526 deferred from a prior session, [#527] this session) against the single v18.2.0 release.
• Incremental verification cadence: pnpm run check ran immediately after each interface-narrowing step, the affected test file after each red/green, and the full suite + lint + fallow dead-code before the pre-completion dispatch — no end-only verification gap.

What caused friction (agent side)

• other (tool-arg misuse) — during the release-PR merge, passed a $(gh pr view 545 --json headRefOid -q .headRefOid) shell substitution as ci_find's expected_sha. ci_find is not a shell, so it received the literal string and timed out after ~125s / 7 retries. Recovered automatically from the timeout's last_seen_sha: e5eca3c (run 28760232176) hint, feeding the run id straight to ci_watch. This was also a minor deviation from /ship-issue step 6.4, which prescribes re-polling gh pr view --json statusCheckRollup for a release PR's in-progress check rather than reaching for ci_find/ci_watch. Impact: ~2 min wait, no rework. Self-identified.
• other (careless multi-edit) — a step-2 Edit on prompting-gateway.ts inserted a stray // eslint-disable-next-line no-restricted-syntax -- placeholder removed below line above prompt(details:. Caught it on the immediate re-read and removed it before the commit. Impact: one extra Edit, no commit churn. Self-identified.
• other (tool-schema slip) — twice included an invalid newText_note key inside an Edit edits[] entry (the forwarder import edit and the architecture.md metrics edit); both were rejected with "must not have additional properties" and retried immediately with the key removed. Impact: 2 rejected calls, no rework. Self-identified.

What caused friction (user side)

• None — the issue was the operator's own, well-specified, and required no mid-session correction or clarification.

Diagnostic details

• Model-performance correlation — one subagent dispatch (pre-completion-reviewer) on judgment-heavy review work; appropriate assignment, PASS first try. No reasoning-weak-model-on-judgment or high-cost-model-on-mechanical mismatch.
• Feedback-loop gap analysis — verification ran incrementally throughout TDD (per-step check + affected test file), not only at the end; no gap to flag.
• Escalation-delay / unused-tool — no rabbit-hole or missing-context friction; the ci_find timeout was a single tool call (its 7 retries are internal), so no >5-call escalation and no subagent/colgrep opportunity was missed.

Changes made

1. Added this Final Retrospective stage entry to packages/pi-permission-system/docs/retro/0527-delete-dead-yolo-arms.md.
2. No AGENTS.md or prompt changes — the operator confirmed retro-only; the one substantive slip (ci_find on a release-PR in-progress check) is already covered by /ship-issue step 6.4's statusCheckRollup re-poll guidance.