diff --git a/agents/gladstone/work/queue-321/BUILD.md b/agents/gladstone/work/queue-321/BUILD.md
index 55e5b6667..0965089c0 100644
--- a/agents/gladstone/work/queue-321/BUILD.md
+++ b/agents/gladstone/work/queue-321/BUILD.md
@@ -99,3 +99,73 @@ Receipt correction: the first commit embedded ordinary diff context lines that
 contain a single space. git diff --check flagged those as trailing whitespace.
 This follow-up uses the exact zero-context diff instead. The run sheet is
 unchanged, no tests or Node commands run, and no amend or force-push is used.
+
+## F11 addition (sage-3805, mos-1549, ops-0275)
+
+The brief was extended after F7/F10 drafting and re-pinned at revision3733:
+canonical local commit a9bae9af2, same F7 section anchor, full verified blob
+0e684ef2103447dcc2013b6bf81b1c4ca5bbc0bd (requested pin0e684ef21034).
+Read using git show from the canonical checkout; no fetch, rebase or queue write
+is required. This new pin supersedes the earlier brief pin for this follow-up.
+
+Defect: a precheck one second after unit start found no bus.sqlite yet.
+Section10 now requires loopback healthz success after a unit start before any
+case2-precheck.sh, including section9's --library-status. It uses the same
+127.0.0.1:<port>/healthz curl form as scripts/case1-accept.sh:458. The subshell
+tries at most30 times, each curl capped at2 seconds, with1 second between failed
+attempts (at most89 seconds plus scheduling overhead). Exhaustion prints STOP
+and exits only the subshell. The instruction says to stop before precheck/adopt;
+it does not exit the interactive operator shell. The section9 library-gitea row
+now explicitly requires this bounded wait before --library-status. <port> is the
+installed Console unit's --port, not an assumed port or business name.
+No host action, test, Node command or credential access occurred.
+
+Required grep repeated for the widened scope:
+
+```sh
+git grep -n 'host-run-sheet' -- 'packages/*/tests/*' 'scripts/test-*.sh'
+# exit1, no matches
+git grep -n 'case2-precheck.sh' -- 'packages/*/tests/*' 'scripts/test-*.sh'
+# exit0, positive control; output follows
+packages/cli/tests/case1-accept.test.mjs:26:const PRECHECK = `${HOME}/.local/share/mosaic-stack/copies/${COPY}/scripts/case2-precheck.sh`;
+packages/cli/tests/case2-install.test.mjs:2:// scripts/case2-precheck.sh's library checks and --library-status mode. Brief:
+packages/cli/tests/case2-install.test.mjs:23:const PRECHECK = join(REPO, "scripts", "case2-precheck.sh");
+packages/cli/tests/case2-install.test.mjs:271:// ---- case2-precheck.sh, the library profile (D6a) ----
+packages/cli/tests/case2-install.test.mjs:334:// ---- case2-precheck.sh --library-status (D6b) ----
+packages/cli/tests/case2-unit.test.mjs:2:// and scripts/case2-precheck.sh checks the host before they start. Brief: docs/plans/2026-10-20_case2-rows.md
+packages/cli/tests/case2-unit.test.mjs:20:const PRECHECK = join(REPO, "scripts", "case2-precheck.sh");
+packages/cli/tests/case2-unit.test.mjs:588:// ---- case2-precheck.sh ----
+```
+
+No test reads the changed run-sheet lines; the stop condition does not apply.
+No test run is needed under the docs-only brief. Static verification checks both
+locations, retry limit/timeout, the loopback URL, unchanged F7/F10 and scoped diff.
+
+F11 delta against d9400f0d3 (git diff --unified=0):
+
+```diff
+diff --git a/docs/guides/host-run-sheet.md b/docs/guides/host-run-sheet.md
+index 96fd4f363..e9fa87f24 100644
+--- a/docs/guides/host-run-sheet.md
++++ b/docs/guides/host-run-sheet.md
+@@ -322 +322 @@ file with `stat -c '%U %a %n' PATH`, never `cat`. `<business>` is the host's bus
+-| `/srv/mosaic/.config/mosaic-dev/secrets/<business>/` | `library-gitea` | 0600 | mosaic | library | `case2-precheck.sh --business <business> --library-status`, after the bus is up: `library-last-error library-credential-missing` until it's placed, then `library <project> last fetched ...` |
++| `/srv/mosaic/.config/mosaic-dev/secrets/<business>/` | `library-gitea` | 0600 | mosaic | library | After a unit start, wait for loopback `/healthz` with the bounded retry in section 10 before `case2-precheck.sh --business <business> --library-status`: `library-last-error library-credential-missing` until it's placed, then `library <project> last fetched ...` |
+@@ -357,0 +358,16 @@ None by hand. I2's `case2-unit.sh` enables both units, starts the bus, then the
++After a unit start, wait for the Console's loopback `/healthz` to succeed before running
++`case2-precheck.sh`, including `--library-status` in section 9. Replace `<port>` with the installed
++Console unit's `--port`. This retry is bounded to 30 attempts, each with a 2-second timeout, with
++1 second between failed attempts. If it prints STOP, stop here; do not run the precheck or adopt.
++
++```sh
++(
++  attempts=0
++  until curl -fsS --max-time 2 -o /dev/null 'http://127.0.0.1:<port>/healthz'; do
++    attempts=$((attempts + 1))
++    [ "$attempts" -lt 30 ] || { echo "STOP: loopback healthz did not become ready; do not continue" >&2; exit 1; }
++    sleep 1
++  done
++)
++```
++
+```
diff --git a/docs/guides/host-run-sheet.md b/docs/guides/host-run-sheet.md
index 96fd4f363..e9fa87f24 100644
--- a/docs/guides/host-run-sheet.md
+++ b/docs/guides/host-run-sheet.md
@@ -319,7 +319,7 @@ file with `stat -c '%U %a %n' PATH`, never `cat`. `<business>` is the host's bus
 |---|---|---|---|---|---|
 | `/srv/mosaic/.config/mosaic-dev/secrets/` | `claude-session.env`, one line `ZAI_API_KEY=...` | 0600 | mosaic | library | `<path> sets ZAI_API_KEY` |
 | `/srv/mosaic/.config/mosaic-dev/secrets/` | the Console's proof file, the path the args file's `--proof-file` names | 0600 or 0400 | mosaic | library | none. `case2-unit.sh` refuses at render. Precheck line missing. |
-| `/srv/mosaic/.config/mosaic-dev/secrets/<business>/` | `library-gitea` | 0600 | mosaic | library | `case2-precheck.sh --business <business> --library-status`, after the bus is up: `library-last-error library-credential-missing` until it's placed, then `library <project> last fetched ...` |
+| `/srv/mosaic/.config/mosaic-dev/secrets/<business>/` | `library-gitea` | 0600 | mosaic | library | After a unit start, wait for loopback `/healthz` with the bounded retry in section 10 before `case2-precheck.sh --business <business> --library-status`: `library-last-error library-credential-missing` until it's placed, then `library <project> last fetched ...` |
 | `/srv/mosaic/.config/mosaic-dev/secrets/agents/<business>/<agent>/` | one file per service | 0600, dirs 0700 | mosaic | both | none. Filled only by `mosaic credentials issue`, or Approve after #436. Never by hand. |
 
 The installer key, `<configDir>/secrets/hosts/<business>/<hostId>/installer`, is not a slot anyone places.
@@ -355,4 +355,20 @@ Precheck line: `ok      notifier config <dataRoot>/notify/<business>/notify.json
 None by hand. I2's `case2-unit.sh` enables both units, starts the bus, then the Console (Q189, mos-1122).
 `stack-upgrade.sh` stops and starts both units itself.
 
+After a unit start, wait for the Console's loopback `/healthz` to succeed before running
+`case2-precheck.sh`, including `--library-status` in section 9. Replace `<port>` with the installed
+Console unit's `--port`. This retry is bounded to 30 attempts, each with a 2-second timeout, with
+1 second between failed attempts. If it prints STOP, stop here; do not run the precheck or adopt.
+
+```sh
+(
+  attempts=0
+  until curl -fsS --max-time 2 -o /dev/null 'http://127.0.0.1:<port>/healthz'; do
+    attempts=$((attempts + 1))
+    [ "$attempts" -lt 30 ] || { echo "STOP: loopback healthz did not become ready; do not continue" >&2; exit 1; }
+    sleep 1
+  done
+)
+```
+
 Precheck line: none. Both units active after the render: precheck line missing.