diff --git a/docs/plans/2026-10-25_prd-1-18-brief.md b/docs/plans/2026-10-25_prd-1-18-brief.md
new file mode 100644
index 000000000..d141be43a
--- /dev/null
+++ b/docs/plans/2026-10-25_prd-1-18-brief.md
@@ -0,0 +1,70 @@
+# PRD 1.18 brief: REQ-INST-2 prints the providers entry
+
+Sage, 2026-10-25, for Mos's ruling mos-1671 on sage-4418. This follows
+`docs/plans/BRIEF-TEMPLATE.md`. Vikunja 458 (bundled Pocket ID).
+
+## PRD 1.18 REQ-INST-2 prints the providers entry (mos-1671)
+
+### Problem
+
+REQ-INST-2's second bullet says the stack installs the bundled Pocket ID "and
+writes it as the Console's one providers entry". That sentence is Mos's reading
+(mos-1202), not Jason's words. The row 255 design, landed at de3e23dde, chose R1:
+enroll prints the entry and writes nothing, because config.json is user-authored
+and never overwritten (canon invariant 2, Q175). Mos approved R1 in mos-1666 and
+ruled the amendment in mos-1671. What the requirement allows or forbids is
+unchanged.
+
+### Owner and reviewer
+
+- Owner: Gosalyn.
+- Reviewer: Webby.
+- After: row 255 (landed).
+
+### Files owned
+
+- `docs/prd/mosaic-stack.md`.
+- `packages/tasks/requirements.json`: version 1.18 only. No id or title changes,
+  so the count stays 87.
+- `packages/tasks/tests/requirements.test.mjs`: the version pin 1.18 (:24).
+
+### What ships
+
+- In REQ-INST-2's second bullet (PRD :1519-1520), replace
+  "and writes it as the Console's one providers entry."
+  with
+  "and prints the Console's one providers entry for the user to add to
+  config.json. The stack never writes config.json (canon invariant 2)."
+  The rest of the bullet stays, and so does Jason's Q203 quote.
+- Status line: version 1.18.
+- The header gets a 1.18 sentence: Version 1.18 corrects Mos's reading in
+  REQ-INST-2 to match the approved row 255 design. The stack prints the
+  providers entry and never writes config.json. What the requirement allows or
+  forbids is unchanged (mos-1671, sage-4418). Doc-only, so it takes the 1.11
+  path: one seat drafts, a second reviews, Sage lands.
+- A "Version 1.18 source" line, placed before the 1.17 one: Mos's ruling
+  mos-1671 on 2026-10-25, answering sage-4418, with the old and new text.
+
+### Out of scope
+
+- The P1 to P6 build rows from the row 255 design. Sage files them after this
+  lands (mos-1671).
+- Any other REQ-INST-2 wording, and REQ-INST-1 and REQ-INST-3.
+
+### Gate
+
+- Webby checks that the PRD diff is the replacement, the Status line, the 1.18
+  sentence and the source line, and nothing else.
+- On Sage's gate:
+  - tasks, run whole;
+  - bus, run whole, because the broker loads requirements.json;
+  - cli `stack-copy.test.mjs`;
+  - every `scripts/test-*.sh`, under `timeout -k 10`.
+- Mos gets the landing commit.
+
+### Handoffs
+
+Every seat hands off directly (DECISIONS Q210, mos-1221). When the owner pushes a
+round or the reviewer posts a verdict, that seat messages the next seat's T3
+thread and Sage's with `mcp__t3__t3_send_message`. Mos has one step here, which
+is receiving the landing commit.