Make v1 the default sub-agent surface and ask before base or v2

devlog/_plan/260913_subagent_v1_default_encryption_guard/010_roadmap.md

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+# Sub-agent surface: v1 as the install default, with an approval guard on base and v2
+
+## Why this unit exists
+
+The v2 collaboration surface cannot deliver a task from a ChatGPT-native parent to a
+routed child. Codex mints that child task as backend `encrypted_content`, and only the
+ChatGPT backend holds the key, so an external provider receives ciphertext it cannot
+read. OpenCodex already fails closed on it (`unreadable_encrypted_agent_task`) and
+documents the limitation as issue #92, but the product still ships `base` as the install
+default, and `base` pins Sol and Terra to v2. A new user who delegates from Sol to Grok
+therefore meets the failure on their first attempt, with no warning that the mode they
+never chose is the reason.
+
+This unit makes v1 the default, and makes base and v2 a choice the operator confirms
+after reading what it costs.
+
+## Locked decisions
+
+**D1 — an absent `multiAgentMode` key still means base.** Roughly fifteen call sites read
+`config.multiAgentMode ?? "default"`, and the management API deletes the key when the
+operator selects base. Re-pointing that fallback to `"v1"` would make the key's absence
+ambiguous: it could no longer distinguish "never configured" from "explicitly base". So
+what changes is the written default — `getDefaultConfig()` now emits an explicit
+`multiAgentMode: "v1"`, exactly the shape `subagentModels` already uses. The resolver is
+untouched, and the merge that could push a default into an existing document runs only
+on the schema-repair path.
+
+**D2 — an existing operator is asked, not flipped.** Rewriting a stored
+`multiAgentMode: "v2"` during an update would change a setting its owner deliberately
+made, on a machine they are not looking at. Instead the runtime computes an advisory,
+the GUI raises it once, and only the operator's answer writes. That is also what makes
+the two buttons meaningful: 계속하기 keeps the current mode, v1으로 바꾸기 applies v1.
+
+**D3 — the advisory is a version counter, not a boolean.** `multiAgentSurfaceAdvisoryVersion`
+mirrors `subagentModelsVersion`. When the encryption limitation is fixed upstream, or when
+a later release needs to say something different about the same setting, bumping the
+constant re-raises the notice for everyone without adding another key.
+
+**D4 — one dialog component, two triggers.** The approval dialog shown when the operator
+selects base or v2 and the post-update advisory differ only in their heading and body
+text. They offer the same two actions and link to the same guide, so they are one
+component with a `reason` discriminator rather than two that drift apart.
+
+**D5 — the guide is a real published page, not an anchor.** The dialog links to
+`https://opencodex.me/guides/subagent-v1-default/`, a new docs-site page whose job is to
+make the failure legible: an inline SVG showing the same delegation succeeding under v1
+and dying at the provider boundary under v2.
+
+## Work phases
+
+| Phase | Outcome |
+| --- | --- |
+| wp1 | This roadmap, with the decisions above locked before any code moves. |
+| wp2 | Runtime: `getDefaultConfig()` emits v1, the advisory state and its version constant exist, and `GET/PUT /api/v2` carry them. |
+| wp3 | GUI: the approval dialog, both triggers wired, and translations for all nine locales. |
+| wp4 | The docs-site guide and its SVG, plus the link from the dialog and the existing surface guide. |
+| wp5 | Focused tests, typecheck, PR to `dev` with a UI screenshot, exact-head CI, merge. |
+
+## Out of scope
+
+Fixing the encryption limitation itself. `agentTaskRecovery` and `plaintextV2AgentMessages`
+remain experimental and default-off; this unit changes which surface an operator lands
+on by default, not what v2 can carry.

devlog/_plan/260913_subagent_v1_default_encryption_guard/020_runtime_default_and_advisory.md

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+# wp2 — Runtime: v1 default and the advisory state
+
+## What changes
+
+`src/config/multi-agent-surface.ts` (new) owns three things:
+
+- `MULTI_AGENT_SURFACE_ADVISORY_VERSION = 1`.
+- `resolveMultiAgentMode(config)`, the single reader that turns a stored value into
+  `"v1" | "default" | "v2"`. It keeps the existing rule that an absent key means
+  `"default"`; it exists so the advisory and the catalog agree on one answer.
+- `multiAgentSurfaceAdvisoryRequired(config)`, true when the resolved mode is not `"v1"`
+  and the stored `multiAgentSurfaceAdvisoryVersion` is below the constant.
+
+`getDefaultConfig()` gains `multiAgentMode: "v1"` and
+`multiAgentSurfaceAdvisoryVersion: MULTI_AGENT_SURFACE_ADVISORY_VERSION`. A fresh install
+has nothing to advise about, so it starts acknowledged.
+
+`src/types/config.ts` gains the optional `multiAgentSurfaceAdvisoryVersion?: number`, and
+`configSchema` in `src/config.ts` accepts it as a positive integer with `.catch(undefined)`
+so a hand-edited value cannot fail the parse.
+
+## Management API
+
+`GET /api/v2` adds one response-only object:
+
+```json
+{
+  "multiAgentSurfaceAdvisory": {
+    "required": true,
+    "mode": "v2",
+    "recommended": "v1",
+    "version": 1,
+    "docsUrl": "https://opencodex.me/guides/subagent-v1-default/"
+  }
+}
+```
+
+`PUT /api/v2` accepts `multiAgentSurfaceAdvisoryAcknowledged: true`, which stores the
+current constant and is idempotent. It composes with an existing `multiAgentMode` write in
+the same body, because `v1으로 바꾸기` sends both in one request and must not leave the
+advisory raised if the mode write succeeded.
+
+It stays a boolean in, number out. A client that could post an arbitrary version could
+silence a future advisory it has never seen.
+
+## What deliberately does not change
+
+The catalog stamping in `src/codex/catalog/sync.ts`, the `keepNativeChatGptOnV1` hybrid,
+and every `?? "default"` fallback. This phase moves the written default and adds one
+piece of state; it does not renegotiate what the three modes mean.
+
+## Tests
+
+New tests go into existing files. `tests/test-layout.test.ts` requires every new test file to
+be registered in both `scripts/test-layout/layout.json` and
+`tests/fixtures/test-layout-expected.json`, and a file named after this route does not resolve
+through the regex seeds. Extending files that already own these subsystems is the smaller
+change and keeps the guard quiet.
+
+`tests/server/config.test.ts` — a fresh config resolves to v1 and starts acknowledged.
+`tests/codex-integration/codex-v2-gate.test.ts`, in its existing management-API parity
+describe block — the advisory is required for a v2 config and for a config with no key, not
+required after acknowledgement, and a combined mode plus acknowledgement write persists both.

devlog/_plan/260913_subagent_v1_default_encryption_guard/030_gui_approval_dialog.md

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+# wp3 — GUI: the approval dialog and its two triggers
+
+## Component
+
+`gui/src/components/SubagentSurfaceWarningModal.tsx`, modelled on
+`OAuthTosWarningModal.tsx`: a native `<dialog>` opened with `showModal()` so focus
+trapping, the backdrop and Escape come from the platform.
+
+Props:
+
+| Prop | Meaning |
+| --- | --- |
+| `reason` | `"selection"` when the operator just clicked base or v2, `"advisory"` for the one-time post-update notice. |
+| `mode` | The mode being selected, or the mode currently stored, depending on `reason`. |
+| `docsUrl` | The published guide. |
+| `onContinue` | Keep or apply the non-v1 mode. |
+| `onChooseV1` | Apply v1. |
+
+Both actions are real buttons in `.modal-actions`. `v1으로 바꾸기` is the primary, because
+it is the recommended answer; `계속하기` is the ghost. Escape and the backdrop resolve to
+the same outcome as `계속하기` for the advisory (the stored mode is kept) and to a no-op
+for a selection (the click is abandoned and the segmented control does not move).
+
+## Triggers
+
+**Selection.** `Models.tsx` `setMultiAgentMode` and `use-dashboard-data.ts` `switchMaMode`
+stop writing directly for `"default"` and `"v2"`. They stage the pending mode, render the
+dialog, and write only from `onContinue`. Selecting `"v1"` stays immediate: confirming a
+move toward the safe default would be noise.
+
+**Advisory.** The dashboard reads `multiAgentSurfaceAdvisory.required` from the `/api/v2`
+poll it already runs and opens the dialog once per load while it is required. `계속하기`
+sends the acknowledgement alone; `v1으로 바꾸기` sends the mode and the acknowledgement
+together.
+
+## Translations
+
+Nine locales live in `gui/src/i18n/`: en, ko, ja, zh, zh-TW, fr, de, ru, tr. Keys:
+
+- `subagentSurface.selectionTitle`, `subagentSurface.selectionBody`
+- `subagentSurface.advisoryTitle`, `subagentSurface.advisoryBody`
+- `subagentSurface.continue`, `subagentSurface.switchToV1`, `subagentSurface.learnMore`
+
+Korean carries the literal `계속하기` and `v1으로 바꾸기` the user asked for; the other
+locales carry their natural equivalents.

devlog/_plan/260913_subagent_v1_default_encryption_guard/040_docs_guide_and_visual.md

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+# wp4 — The guide and its visual explanation
+
+`docs-site/src/content/docs/guides/subagent-v1-default.md` answers one question: why does
+a v2 delegation from a ChatGPT model to Grok or Claude fail, and why is v1 the default
+until it does not.
+
+Structure, answer first:
+
+1. What you will see — the exact `unreadable_encrypted_agent_task` failure and the HTTP 400.
+2. Why it happens — an inline SVG, described below.
+3. What each mode does now, and why v1 is the shipped default.
+4. What to do if you want v2 anyway, including `keepNativeChatGptOnV1`.
+5. When this page goes away — the condition under which the default moves back.
+
+## The SVG
+
+Two stacked lanes over the same delegation, so the reader compares one variable.
+
+The v1 lane: parent (ChatGPT model) emits a plaintext `spawn_agent` task, OpenCodex routes
+it, the routed child reads it, and the lane ends green.
+
+The v2 lane: the parent emits `encrypted_content` minted by the ChatGPT backend. The lane
+crosses the provider boundary, drawn as a vertical rule, and the routed child holds
+ciphertext with no key. The lane ends at a stop marker labelled with the real error code.
+A short caption states the asymmetry in words: the key never leaves the backend that
+minted it, so the failure is structural rather than a misconfiguration.
+
+Accessibility is part of the artifact, not a later pass: `role="img"`, a `<title>` and a
+`<desc>`, meaning carried by labels rather than colour alone, and text that stays legible
+at the width Starlight gives a guide body. The prose immediately below repeats what the
+diagram says, so the page still works with images off.
+
+## Wiring
+
+The page needs an explicit sidebar entry in `docs-site/astro.config.mjs`, next to the
+`guides/sub-agent-surface` entry. Registration is per-page there; nothing is autogenerated
+from the directory, so a page without an entry ships invisible.
+
+`guides/sub-agent-surface.md` gains a pointer at the mode table and its `Not sure?` tip
+changes to recommend v1. The GUI dialog links to the published URL. The i18n mirrors under
+`docs-site/src/content/docs/<locale>/` are not translated in this unit; the English guide
+is the source and the existing locales keep their current surface page.

devlog/_plan/260913_subagent_v1_default_encryption_guard/050_verification_and_delivery.md

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+# wp5 — Verification and delivery
+
+## Local checks
+
+`bun run typecheck`, `bun run lint:gui`, and the focused files touched by wp2 and wp3.
+The full suite is the hosted gate, not a local one: CI runs typecheck and the whole suite
+on Linux, Windows and macOS, and that run is the evidence the merge decision uses.
+
+## Screenshot
+
+`enforce-target` rejects a PR that mentions `gui` without a screenshot of the UI change.
+That is a real gate and this PR is squarely a GUI change, so the dialog is captured from a
+running dashboard, not mocked in a drawing tool, and attached to the description.
+
+## PR
+
+Target `dev`. Fill Summary, Verification and Checklist from
+`.github/PULL_REQUEST_TEMPLATE.md`. Reference issue #92 as context rather than `Closes`,
+because this unit does not fix the encryption limitation.
+
+## Merge
+
+Maintainer integration through the PR, under the `dev` policy in `MAINTAINERS.md`: record
+the decision and CI evidence at the exact final head. A green aggregate on an earlier
+commit is not evidence for the head being merged.

devlog/_plan/260913_subagent_v1_default_encryption_guard/060_upstream_evidence.md

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+# Evidence: is the v2 encrypted-task limitation fixed anywhere?
+
+Collected 2026-09-13 with the Aside browser agent against public GitHub, to check that
+this unit is not shipping a warning about something already solved.
+
+## Upstream (openai/codex)
+
+| Item | State | What it actually covers |
+| --- | --- | --- |
+| #35845 Support plaintext collaboration tool messages | merged, 0.147.0-alpha.1 | The receiving half only. It handles plaintext that was already produced, gated on the `encrypted_function_args: []` marker. It does not make an OpenAI parent emit plaintext. |
+| #36892 Support leaf models in multi-agent v2 | merged | Fixed the Sol/Terra plus Luna case. Does not touch cross-provider delivery. |
+| #36376 OpenAI parent still sends an encrypted v2 task to a non-OpenAI child | open | Reproduced across CLI 0.146 to 0.151 on Windows, macOS and Linux. |
+| #37197 Plaintext support does not complete cross-provider delivery | open | The clearest statement that a sending-side policy is the missing piece; the reporter built and validated a local `message_delivery = "plaintext"` policy. |
+| #32031 spawn_agent hides model overrides | open | Adjacent; no maintainer response. |
+
+None of the open issues has an official maintainer response or an ETA. So the sending side
+is unfixed, and it is the side that matters here.
+
+## Why a proxy cannot paper over it
+
+With an OpenAI parent the value in `encrypted_content` is real Fernet-shaped ciphertext
+(`gAAAA...`), not a plaintext assignment behind a marker. A proxy that rewrites the field
+has nothing to rewrite it from. The fix has to come from the parent side emitting the
+plaintext marker, which is exactly the path #35845 does not open for OpenAI parents.
+
+## Scope of the failure
+
+Affected: v2 with a ChatGPT-native parent and a routed child. Observed with Sol to Grok,
+Astra to Grok, Luna and Astra to Claude, DeepSeek, GLM and others. It is not model
+specific; no routed child can read backend ciphertext.
+
+Unaffected: v1 in any topology, routed parent to routed child under v2, and native parent
+to native child under v2 (the backend can decrypt what it minted).
+
+Already handled here: the mid-thread native-to-routed model switch, fixed by #4135, and
+the opt-in `agentTaskRecovery` path, which recovers most fresh spawns but still loses
+message-type follow-ups and multipart envelopes (#3661).
+
+## Conclusion for this unit
+
+The warning is accurate and the default change is justified. v1 is the surface maintainers
+and users both name as the reliable one for cross-provider delegation, and there is no
+upstream commitment that would make this advisory short-lived by accident.

devlog/_plan/260913_subagent_v1_default_encryption_guard/070_audit_followups.md

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+# Audit follow-ups
+
+An independent reviewer audited the roadmap against the branch tip before any code moved.
+Verdict: near-pass. No factual claim in D1 through D5 failed; three cautions are resolved
+here.
+
+## 1. The advisory fires for most existing installs, and that is the point
+
+The reviewer noted that a config written before this change usually has no `multiAgentMode`
+key at all, so the advisory raises for the majority of upgrading users rather than a rare
+corner. That is intended. Those are precisely the operators running base, which pins Sol and
+Terra to v2, and who have never been told what that costs them when they delegate to a
+routed model. It fires once per install and both answers end it.
+
+## 2. New test files would trip the layout guard
+
+Folded into 020: the new assertions extend `tests/server/config.test.ts` and the existing
+management-API describe block in `tests/codex-integration/codex-v2-gate.test.ts` rather than
+creating files that would need registering in two manifests.
+
+## 3. The guide needs a sidebar entry
+
+Folded into 040.
+
+## Carried into the build
+
+`src/config/multi-agent-surface.ts` lands in an existing documented directory, so
+`structure:check` has nothing new to claim. `structure/gui-and-management-api.md` documents
+the `/api/v2` contract and must be updated in the same change, as must the mode table in
+`structure/subagents.md`, which still calls base the install default.
+
+GUI locale parity is enforced by `Record<TKey, string>` at GUI build time, so a missing key
+in any of the nine catalogs fails `bun run build:gui` rather than slipping through.

devlog/_plan/260913_subagent_v1_default_encryption_guard/evidence/README.md

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+# Evidence: the dialog as the operator sees it
+
+Captured from a real dashboard on 2026-09-13. A throwaway OpenCodex home with
+`multiAgentMode: "v2"` and no stored acknowledgement, served on a spare port, read with a
+headless browser. Not a mockup.
+
+`dashboard-advisory-en.png` — the one-time advisory an existing v2 install raises after
+updating. The sub-agent switch behind it still reads v2, because nothing was changed for
+that operator: the notice is asking, not reporting.
+
+`dashboard-advisory-ko.png` — the same dialog in Korean, showing the two answers the
+request specified: 계속하기 and v1으로 바꾸기.
+
+The selection dialog is the same component with `reason="selection"`; its heading and body
+differ and its two answers do not. `gui/tests/subagent-surface-warning.test.tsx` covers that
+variant, the backdrop dismissal, and the gate on all three mode switches.

docs-site/astro.config.mjs

@@ -106,6 +106,7 @@ export default defineConfig({
             { label: "Video Bridge", translations: { fr: "Pont vidéo", ko: "비디오 브릿지", "zh-CN": "视频桥接", "zh-TW": "影片橋接", ru: "Video Bridge", ja: "動画ブリッジ", tr: "Video Bridge" }, slug: "guides/video-bridge" },
             { label: "Web Dashboard", translations: { fr: "Tableau de bord web", ko: "웹 대시보드", "zh-CN": "网页控制台", "zh-TW": "網頁儀表板", ru: "Веб-дашборд", ja: "ウェブダッシュボード", tr: "Web Kontrol Paneli" }, slug: "guides/web-dashboard" },
             { label: "Sub-agent Surface", translations: { fr: "Interface des sous-agents", ko: "서브에이전트 서피스", "zh-CN": "子代理界面", "zh-TW": "子代理介面", ru: "Интерфейс подагентов", ja: "サブエージェントサーフェス", tr: "Alt Ajan Arayüzü" }, slug: "guides/sub-agent-surface" },
+            { label: "Why v1 Is the Default", translations: { fr: "Pourquoi v1 est la valeur par défaut", ko: "v1이 기본값인 이유", "zh-CN": "为什么默认是 v1", "zh-TW": "為什麼預設是 v1", ru: "Почему v1 по умолчанию", ja: "v1 がデフォルトである理由", tr: "Neden varsayılan v1" }, slug: "guides/subagent-v1-default" },
           ],
         },
         {