diff --git a/docs/prd/mosaic-stack.md b/docs/prd/mosaic-stack.md
index 42ff1fb4a..94643cc82 100644
--- a/docs/prd/mosaic-stack.md
+++ b/docs/prd/mosaic-stack.md
@@ -1,6 +1,6 @@
 # PRD: Mosaic Stack
 
-- Status: approved, version 1.14. Jason approved draft 0.4 unchanged as
+- Status: approved, version 1.15. Jason approved draft 0.4 unchanged as
   1.0 on 2026-10-05 (lead decision 61). They approved version 1.1, the
   Organization requirements, in decision 03130d08-ddce-480d-a601-e59f64744fc3
   on 2026-10-14. They approved version 1.2, the chief of staff, the
@@ -41,7 +41,21 @@
   takes the same path as 1.11 (mos-1231, vikunja:19/463). Version 1.14
   adds the playground levels to REQ-LIB-2 and a draft universe to
   REQ-LIB-3, from the approved playground ruling. It takes the same path
-  as 1.11 (mos-1233, mos-1238, mos-1241, vikunja:19/464).
+  as 1.11 (mos-1233, mos-1238, mos-1241, vikunja:19/464). Version 1.15
+  rewrites REQ-LIB-6 to Jason's Q223 and Q226 rulings and adds supporting
+  folders to REQ-LIB-1 and REQ-LIB-2. Mos ordered it in mos-1320 item 8,
+  and Jason gets a report.
+- Version 1.15 source: Jason's Q223, answering Q29: "The agents are not
+  allowed to write the prose into the writing projects. Agents are
+  allowed to CRUD character sheets, info summaries, cross-link info, and
+  supporting documentation. They are NOT allowed to actually write any of
+  the story." and "They are permitted to freely converse with the writer
+  via chat interface." His Q226: "Q30: yes." to Mos's reading that a
+  folder nobody has marked counts as story, and "F43: citations should be
+  requireable. Tunable setting." Mos's reading of F43: "require-citation
+  is a setting changed by a human only. Mos's default is off." The text
+  is drafted from the Case 2 design's ruling after r11, "agents never
+  write story", b68d79663 on `gosalyn/case2-design`.
 - Version 1.14 source: Jason's Q176 lines TARGET.md:92 "Brainstorm ideas
   in a "playground" where new universes can be created", :93 "Brainstorm
   ideas in a "playground" for books in a universe" and :94 "This means
@@ -1168,12 +1182,14 @@ library is the user's own writing repository.
 
 - **REQ-LIB-1.** A library project maps the user's writing repository
   onto universes, books, entity types such as character and place, the
-  manuscript, and playgrounds. The mapping sits in the organization file
+  manuscript, playgrounds and supporting folders. The mapping sits in the
+  organization file
   and fits the user's own folder layout. Only the human changes it, and
   an agent's organization write that changes it is refused. So
   `universe.book.{character,place,...}` reads as universe, book folder,
   type folder. (Design 1.1 and M9. Q176 Case 2 "Data is stored in
-  little-endian organizational scheme".)
+  little-endian organizational scheme". Version 1.15: supporting
+  folders.)
 - **REQ-LIB-2.** Playgrounds are never confused with canon. A playground
   has one of three levels, set by where its prefix sits. A book-level
   prefix lies inside one of its universe's book folders, and its files
@@ -1186,15 +1202,20 @@ library is the user's own writing repository.
   mapping is refused when a prefix lies inside or holds another
   universe's book folder, when a prefix equals or holds a book folder of
   its own universe, when two prefixes overlap, when a draft has books or
-  no prefix, and when a hybrid names a draft as a source. A file's scope
-  comes from its path alone, prefixes first: a Markdown file under a
-  playground prefix at any level is playground, any other Markdown file
-  in a book folder is canon, and everything else is unmapped and never
-  returned. Lookups return canon unless the caller asks for playground.
-  An agent can't cite a playground file as a fact, a finding or a
-  correction. The Console shows each cite's scope. (Design 1.2, 5.2 and
-  7.4, and the playground ruling, 51fdfb7e2. Q176 Case 2, the playground
-  items, TARGET.md:92-94. Version 1.14: the levels and the draft.)
+  no prefix, and when a hybrid names a draft as a source. Supporting
+  prefixes, the folders agents may write in (REQ-LIB-6), follow the same
+  placement rules. A file's scope comes from its path alone, prefixes
+  first: a Markdown file under a supporting prefix is supporting, one
+  under a playground prefix at any level is playground, any other
+  Markdown file in a book folder is canon, and everything else is
+  unmapped and never returned. A folder in both lists is supporting.
+  Lookups return canon unless the caller asks for playground or
+  supporting. A citation marked as canon must name a canon file, so an
+  agent can't cite a playground or supporting file as canon. The Console
+  shows each cite's scope. (Design 1.2, 5.2 and 7.4, the playground
+  ruling, 51fdfb7e2, and the ruling after r11. Q176 Case 2, the
+  playground items, TARGET.md:92-94. Version 1.14: the levels and the
+  draft. Version 1.15: supporting.)
 - **REQ-LIB-3.** Universes stay separate. Every lookup names one universe,
   and its results never leave it. A draft universe (REQ-LIB-2) counts as
   a universe here. It has no canon, so a lookup in a draft asks for
@@ -1229,18 +1250,25 @@ library is the user's own writing repository.
   item and "Connections are always visible".)
 - **REQ-LIB-6.** The creative roles are ideas, research, proofreader,
   fact-checker and continuity, plus a companion role that the user's own
-  named agents run as. No creative agent can write to the user's
-  repository. Its tools are the lookups and a message to the human, and
-  research and companion also fetch web pages through the broker. Every
-  message an agent sends the user is a short list of items. Each item
-  cites a line of the repository at a commit, or a page the agent
-  fetched, and the broker checks every cite before it stores the message.
-  The one exception is a message with no items and one of three fixed
-  notices: no cited answer, no answer, or the turn failed. The Console
-  shows each notice as a fixed line, with no text from the model.
-  The user sees only stored messages, on every channel. (Design 4, 5.1,
-  5.2 and 5.3; Q180 for Bean and Chet. Q176 Case 2, the agent list and
-  "User sets strict guardrails for agent capabilities".)
+  named agents run as. Agents never write the story. A creative agent may
+  create, edit and delete Markdown files only under the supporting
+  folders a human marks (REQ-LIB-1), such as character sheets, summaries,
+  cross-link notes and research notes. Every other path in the user's
+  repository is read-only to it, chapters and unmarked folders included,
+  and the broker refuses such a write before any git call. Each agent
+  write is one commit by that agent's own Gitea account, with a trailer
+  naming the agent. The user sees a notice for it and can revert it. Its
+  tools are the lookups, a message to the human and the two write tools,
+  and research and companion also fetch web pages through the broker.
+  Agents talk with the user in free text. A reply may cite lines of the
+  repository at a commit or pages the agent fetched, and the broker
+  checks every citation before it stores the message. A setting,
+  `requireCitation`, makes every reply carry a citation. Only the human
+  changes it, and it is off by default. The user sees only stored
+  messages, on every channel. (Design 4, 5.2 and the ruling after r11.
+  Q223 and Q226. Q180 for Bean and Chet. Q176 Case 2, the agent list,
+  "User sets strict guardrails for agent capabilities" and TARGET.md:101
+  "Agents NEVER write prose for the user". Version 1.15.)
 - **REQ-LIB-7.** The user talks to several creative agents in one chat. A
   room holds one thread per creative agent in a project. A message goes
   to every agent in the room, or only to the agents named by @tags at its
@@ -1591,11 +1619,14 @@ latest-by date and a hard target (Q176).
   - REQ-PROJ-1's "no remote" covers project record repositories. A
     library project is a separate kind with no record repository, and its
     mirror fetches from the remote (design 2.1, 7.2).
-  - REQ-LIB-6 has a stated residual: an `idea` item carries free text,
-    up to 5 items of 200 characters per reply, and code can't tell story
-    text from advice (design 5.1). Accepting it is Jason's or Melanie's
-    (design section 10, step 8). It goes to Jason through Mos
-    (vikunja:19/465).
+  - REQ-LIB-6 has a stated residual: a supporting doc can hold any text,
+    a drafted scene included, and code can't tell a scene from a note.
+    Every agent write shows as a notice and a commit trailer, and the user
+    can revert it. Nothing an agent writes lands in a story path. The
+    agent's Gitea token can write any path of the repository, and the
+    bus's path check is the only path limit, which holds while the bus
+    code does (design, ruling after r11). (Version 1.15 replaced the
+    item-list residual. The old text is in the Version 1.15 note.)
   - Where each id is built: REQ-USER-3 and REQ-USER-4 are rows 193a to
     193d (#1691), with FED R1 to R6. REQ-LIFE-1 is row 194 (#1692) and
     its follow-up row 239. REQ-KILL-1 is row 191 (#1689). The REQ-LIB ids
@@ -1678,6 +1709,45 @@ latest-by date and a hard target (Q176).
     candidates if they have started. C2-12's setup sheet gets one line
     per level (design section 8). Sage files it under Vikunja 464. This
     amendment adds the requirements only.
+- Version 1.15:
+  - The 1.14 text of REQ-LIB-6 was: "The creative roles are ideas,
+    research, proofreader, fact-checker and continuity, plus a companion
+    role that the user's own named agents run as. No creative agent can
+    write to the user's repository. Its tools are the lookups and a
+    message to the human, and research and companion also fetch web pages
+    through the broker. Every message an agent sends the user is a short
+    list of items. Each item cites a line of the repository at a commit,
+    or a page the agent fetched, and the broker checks every cite before
+    it stores the message. The one exception is a message with no items
+    and one of three fixed notices: no cited answer, no answer, or the
+    turn failed. The Console shows each notice as a fixed line, with no
+    text from the model. The user sees only stored messages, on every
+    channel. (Design 4, 5.1, 5.2 and 5.3; Q180 for Bean and Chet. Q176
+    Case 2, the agent list and "User sets strict guardrails for agent
+    capabilities".)"
+  - The 1.12 note's REQ-LIB-6 residual was: "an `idea` item carries free
+    text, up to 5 items of 200 characters per reply, and code can't tell
+    story text from advice (design 5.1). Accepting it is Jason's or
+    Melanie's (design section 10, step 8). It goes to Jason through Mos
+    (vikunja:19/465)." Q223 removed the item list, and the residual went
+    with it. The note now states the new one.
+  - REQ-LIB-1 gains "and supporting folders" in its first sentence and a
+    version tag. REQ-LIB-2 gains the supporting scope, its placement rule
+    and the canon-cite rule, which replaces "An agent can't cite a
+    playground file as a fact, a finding or a correction." The rest of
+    both is unchanged.
+  - REQ-LIB-3, REQ-LIB-4, REQ-LIB-5 and REQ-LIB-7 are unchanged. REQ-LIB-4
+    already says bus writes and pushes come in later rows (C2-02,
+    C2-03b), which covers agent writes and the user's Console saves. Its
+    fetch still uses a read-only token, now the chief of staff's read
+    grant.
+  - The titles of REQ-LIB-1, REQ-LIB-2 and REQ-LIB-6 in
+    `packages/tasks/requirements.json` change with their text. The id
+    count stays 85.
+  - The new refusal codes, settings and row order are in the design's
+    ruling after r11 and in the Q226 briefs of
+    `docs/plans/2026-10-20_case2-rows.md`. Sage files the rows under
+    Vikunja 416. This amendment adds the requirements only.
 
 ## Risks and open questions
 
diff --git a/packages/tasks/requirements.json b/packages/tasks/requirements.json
index 360cd16b5..a079888e0 100644
--- a/packages/tasks/requirements.json
+++ b/packages/tasks/requirements.json
@@ -1,6 +1,6 @@
 {
   "prd": "docs/prd/mosaic-stack.md",
-  "version": "1.14",
+  "version": "1.15",
   "requirements": [
     { "id": "REQ-ROLE-1", "title": "Each role is a reviewed roles/<name>.json: contract, authority map, credentials" },
     { "id": "REQ-ROLE-2", "title": "One holder per role instance, one per assistant session; the chief of staff may end a run, others need a decision" },
@@ -77,12 +77,12 @@
     { "id": "REQ-SESS-1", "title": "Each session shows its lifetime count of completed compactions on pi and Claude Code; an unproven count shows unknown" },
     { "id": "REQ-SESS-2", "title": "Clear context retires a session after a safe stop and starts a fresh successor with none of the old context" },
     { "id": "REQ-SESS-3", "title": "Every session start passes the launch checks: authority, route, revocation, kill switch, limits and admission" },
-    { "id": "REQ-LIB-1", "title": "A library maps the user's writing repository onto universes, books, types and playgrounds; only the human changes it" },
-    { "id": "REQ-LIB-2", "title": "Scope comes from the path; lookups default to canon and a playground file is never cited as canon" },
+    { "id": "REQ-LIB-1", "title": "A library maps the user's repository onto universes, books, types, playgrounds and supporting folders, set by a human" },
+    { "id": "REQ-LIB-2", "title": "Scope comes from the path, lookups default to canon, and a playground or supporting file is never cited as canon" },
     { "id": "REQ-LIB-3", "title": "Universes stay separate; a crossover is a hybrid universe only a human creates, reading its sources' canon" },
     { "id": "REQ-LIB-4", "title": "Git holds every change; the bus fast-forwards a read-only mirror every 60 seconds and agents read only that" },
     { "id": "REQ-LIB-5", "title": "Agents check the library through typed lookup tools that name the commit and show links out and in" },
-    { "id": "REQ-LIB-6", "title": "Creative agents can't write the repository; messages to the user are cited items the broker checks, or a fixed notice" },
+    { "id": "REQ-LIB-6", "title": "Agents never write story, only docs in supporting folders a human marks. Chat is free text, and any citation is checked" },
     { "id": "REQ-LIB-7", "title": "One chat room with several creative agents, addressed by leading @tags; an unknown tag sends nothing" },
     { "id": "REQ-INST-1", "title": "The installer offers optional components: pinned, health-checked, removable, switched on in config; first is SearXNG" },
     { "id": "REQ-INST-2", "title": "With no OIDC provider to configure, the installer deploys a bundled Pocket ID, Q203 (post-v1)" },
diff --git a/packages/tasks/tests/requirements.test.mjs b/packages/tasks/tests/requirements.test.mjs
index cadc7df24..759b011fc 100644
--- a/packages/tasks/tests/requirements.test.mjs
+++ b/packages/tasks/tests/requirements.test.mjs
@@ -21,7 +21,7 @@ test("the list holds the PRD's requirement ids, in its order, at its version", (
   assert.equal(ids.length, 85);
   assert.deepEqual(list.requirements.map((r) => r.id), ids);
   assert.match(prd, new RegExp(`^- Status: approved, version ${list.version.replace('.', '\\.')}\\.`, 'm'));
-  assert.deepEqual([list.prd, list.version], ['docs/prd/mosaic-stack.md', '1.14']);
+  assert.deepEqual([list.prd, list.version], ['docs/prd/mosaic-stack.md', '1.15']);
 });
 
 test('the committed list loads frozen', () => {