diff --git a/README.md b/README.md
index 0011156..273d9d7 100644
--- a/README.md
+++ b/README.md
@@ -53,6 +53,7 @@ docs/TOKENMAXXING.md      # local Claude = tokenmaxxing supervisor
 sume-desk/
   GRAPHITE-HARD-LOCK.md   # paste block for every author prompt
   skills/                 # SoT (orchestration, gt-mq, mega-issue, Formats LC)
+  grok-hooks/             # ~/.grok/hooks/sume-desk.json template (registry rows)
   cursor-rules/user/      # ~/.cursor/rules
   cursor-rules/sume-com/  # <repo>/.cursor/rules
 ```
diff --git a/docs/FLOW.md b/docs/FLOW.md
index 307178c..90ea79d 100644
--- a/docs/FLOW.md
+++ b/docs/FLOW.md
@@ -72,7 +72,9 @@ duplicate the full SKILL into the `.mdc`.
 a supervisor in front of Claude Code that pools subscription accounts and
 swaps near 5h / weekly limits. `claude-human-stream` /
 `agent-human-stream --backend claude` uses that `claude`.
-Local Grok Build (`grok` CLI) uses `agent-human-stream --backend grok`.
+Local Grok Build (`grok` CLI, tokenmaxxing-pinned) uses `agent-human-stream --backend grok`;
+land jobs go through `sume-bg-launch … --until-landed <PR#>` (wrapper land-loop,
+`LANDED:` line, steer via `agent-holders`). See `docs/TOKENMAXXING.md` § Grok Build pool.
 
 SoT: **`docs/TOKENMAXXING.md`**. Short version:
 
diff --git a/docs/TOKENMAXXING.md b/docs/TOKENMAXXING.md
index 7b575ea..6b0bf8b 100644
--- a/docs/TOKENMAXXING.md
+++ b/docs/TOKENMAXXING.md
@@ -3,8 +3,10 @@
 This desk does **not** run bare `claude` against a single Anthropic login.
 On Chase’s machine, **`claude` on PATH is the tokenmaxxing supervisor**.
 `claude-human-stream` / `agent-human-stream --backend claude` (Fable/Opus
-workers) go through that same binary. Grok Build is a different CLI (`grok`)
-and uses `agent-human-stream --backend grok`.
+workers) go through that same binary. **`grok` on PATH is also a tokenmaxxing
+shim** (`__supervise-grok`, installed by `tokenmaxxing init --grok`); Grok
+Build workers (`agent-human-stream --backend grok`) run through it — see
+§ Grok Build pool below.
 
 Upstream: [anaclumos/tokenmaxxing](https://github.com/anaclumos/tokenmaxxing)
 (Bun global, `tokenmaxxing` on PATH). Subscription accounts only — not API keys.
@@ -88,6 +90,41 @@ issues, or chat.
 - Codex can have its own tokenmaxxing pool (`init --codex`). This desk’s
   Fable/Opus path is the **Claude** pool.
 
+## Grok Build pool (SuperGrok seats)
+
+`~/.config/tokenmaxxing/bin/grok` → `bun run ~/.local/src/tokenmaxxing/src/main.ts
+__supervise-grok` → the binary named by `config.json` **`grokBin`** (a pinned
+`~/.grok/downloads/grok-<ver>-macos-aarch64`). That pin is the **only** Grok
+that desk workers run. `~/.grok/bin/grok` (what `grok --version` from that
+path reports) and `~/.grok/version.json` can be newer; they are not what
+runs. `install.sh` prints both; `tokenmaxxing config get grokBin` is the
+check. Bumping the pin = editing `grokBin` (then re-run the desk probes in
+sumelabs/sume#5706, the wire shapes were captured on 1.0.11).
+
+Facts that shape `agent-human-stream --backend grok` (2026-09-02):
+
+- The supervisor ignores SIGINT/SIGHUP and has **no SIGTERM handler**: killing
+  it orphans the raw grok child with its stdout still on the pipe. The desk
+  steer (`sume-bg-launch --resume`) therefore kills the **process group and
+  the raw child** (`agent-holders kill <uuid>`), never the supervisor alone.
+- The child pid lives in `~/.config/tokenmaxxing/grok-live/<supervisorId>`
+  (`{accountId, pid, startedAt}`); stale files self-heal by pid + start time.
+- Three SuperGrok seats rotate on the **weekly** bar; a swap hot-reloads
+  `auth.json` on the next API call (no restart). The `StopFailure rate_limit`
+  respawn path relaunches `grok --resume <sid>` **without** the headless
+  flags (`-p`, `--output-format`) — latent (never fired on this desk); the
+  wrapper aborts if a non-NDJSON line shows up. Upstream fix belongs in
+  tokenmaxxing, not cstack.
+- Hooks: `~/.grok/hooks/tokenmaxxing-grok.json` (`Stop`, `StopFailure
+  rate_limit`) is the pool's; `~/.grok/hooks/sume-desk.json` (installed by
+  `install.sh`) is the desk registry hook. Both are silent, exit 0.
+
+```bash
+tokenmaxxing status          # grok seats: weekly bars
+tokenmaxxing switch --grok   # running sessions hot-reload on their next call
+tokenmaxxing config get grokBin
+```
+
 ## Install / repair (human)
 
 ```bash
diff --git a/install.sh b/install.sh
index 7edfebd..16b221f 100755
--- a/install.sh
+++ b/install.sh
@@ -176,6 +176,13 @@ ensure_wait_hint "$HOME/.codex/AGENTS.md"
 ensure_wait_hint "$HOME/.claude/CLAUDE.md"
 ensure_wait_hint "$HOME/.grok/AGENTS.md"
 
+# Grok land rule (no monitor hand-off) for desks that already had the snippet.
+if [ -f "$HOME/.grok/AGENTS.md" ] && ! grep -q "Land babysit (Grok Build worker)" "$HOME/.grok/AGENTS.md"; then
+  printf '\n' >> "$HOME/.grok/AGENTS.md"
+  sed -n '/^Land babysit (Grok Build worker)/,$p' "$ROOT/sume-desk/grok-agents-snippet.md" >> "$HOME/.grok/AGENTS.md"
+  echo "updated land hint: ~/.grok/AGENTS.md"
+fi
+
 if [ -x "$GTBIN/cstack-gt-wait-merge.test.sh" ]; then
   echo "== cstack-gt-wait-merge matcher =="
   "$GTBIN/cstack-gt-wait-merge.test.sh"
diff --git a/sume-desk/grok-agents-snippet.md b/sume-desk/grok-agents-snippet.md
index 8c7f577..8ace1d3 100644
--- a/sume-desk/grok-agents-snippet.md
+++ b/sume-desk/grok-agents-snippet.md
@@ -9,3 +9,10 @@ Before any `gt submit` / `gt merge` on `sume-com`, read
 `cstack-gt-wait-merge` (labels the tip `merge-queue` now) — do not
 write a sleep/grep loop or wait for PR CI.
 Ignore sections marked **Cursor-only** unless you are Cursor.
+
+Land babysit (Grok Build worker): do **not** use `monitor` / `scheduler_*`
+to wait — a background hand-off ends your headless turn with a snapshot.
+Block in `run_terminal_command` (≤10 min slices, `sleep` between polls). Reply
+`LANDED: yes` only when `git log origin/main --oneline --grep='(#N)'` hits;
+otherwise end the turn with one status line — the desk wrapper re-prompts
+this same session until the grep hits.
diff --git a/sume-desk/skills/sume-main-agent-orchestration/SKILL.md b/sume-desk/skills/sume-main-agent-orchestration/SKILL.md
index b768fc8..dcfcd4a 100644
--- a/sume-desk/skills/sume-main-agent-orchestration/SKILL.md
+++ b/sume-desk/skills/sume-main-agent-orchestration/SKILL.md
@@ -307,8 +307,13 @@ agent-human-stream --resume <uuid> "Follow-up …"               # backend from
 When the main agent needs a **Grok** worker (default **land babysit**, or
 author only if Chase named Grok):
 
-1. Run **Grok Build** on the local machine (`grok` on PATH, currently
-   `~/.grok/bin/grok` via `~/.local/bin/grok`). Not Cursor `Task`.
+1. Run **Grok Build** on the local machine. `grok` on PATH is the
+   **tokenmaxxing** `__supervise-grok` shim (`~/.config/tokenmaxxing/bin/grok`,
+   also `~/.local/bin/grok`); the binary that actually runs is the pin in
+   `~/.config/tokenmaxxing/config.json` `grokBin` (a `~/.grok/downloads/`
+   build — **1.0.11** as of 2026-09-02), **not** `~/.grok/bin/grok`.
+   `install.sh` prints both; `docs/TOKENMAXXING.md` § Grok Build pool is the
+   SoT. Not Cursor `Task`.
 2. Launch with the same human-stream wrapper:
    `agent-human-stream --backend grok --name <job-slug> "<prompt>"`
    Extra `grok` flags go **after** the prompt (`--model grok-4.6`, `--effort`,
@@ -323,8 +328,35 @@ author only if Chase named Grok):
    exits 2 (`missing prompt`) before Grok starts. Pass `--prompt-file`.
    Same job slug stem as the Opus train when this is land babysit.
 5. Do **not** route Grok land/author through Cursor `Task` / `cursor-grok-*`.
-6. Steer / second `--resume`: use `sume-bg-launch` so the previous wrapper
-   on that uuid is stopped first (two `grok -p --resume` = empty live log).
+6. Steer / second `--resume`: **only** via `sume-bg-launch --resume <uuid>`.
+   It runs `agent-holders kill <uuid>` first: TERMs the whole holder group
+   (wrapper + tokenmaxxing supervisor + the raw grok child, which the
+   supervisor does not forward signals to), waits, KILL-escalates, and
+   refuses to launch (exit 3) if the uuid is still held. A bare second
+   `agent-human-stream --backend grok --resume <uuid>` is refused while a
+   holder exists — a second `grok -p --resume` on a live session blocks
+   forever in Grok `session_create` with no output (the empty live log).
+   Never `--continue` for Grok: every desk job shares one cwd, so it picks
+   whichever job started last (the wrapper refuses it when another Grok
+   job is open here).
+7. **Land babysit contract** (#5697 / #5702 class): `grok -p` returns when
+   the **model turn** ends, not when the job ends — a `monitor` /
+   `scheduler_*` hand-off ends the run with a snapshot final. Launch land
+   jobs with **`--until-landed <PR#>`** (+ `--wall-timeout 6h`): the wrapper
+   re-prompts the **same session** until `git log origin/main
+   --grep='(#N)'` hits, denies `monitor,scheduler_create,scheduler_delete`,
+   keeps the laptop awake (`caffeinate -i`), and always appends
+   `LANDED: yes|no` after the last `—— final ——`. Prompt wording like
+   "do not exit" cannot replace this; the prompt only says *how* to watch
+   (block in `run_terminal_command`, ≤10 min slices).
+8. Session id is pre-assigned: fresh Grok launches mint `--session-id`, so
+   the stderr banner shows `📎 session_id=<uuid> … (pre-assigned)` at t=0
+   and the live log is `<stamp>-<name>-<uuid8>.log` (also
+   `LATEST-<name>.log`). `--resume <uuid>` works from any cwd but runs in
+   the session's **original** cwd. Registry rows carry model, child pid,
+   exit code, `landed`, context %, compaction count
+   (`agent-human-stream --sessions --backend grok`); transcript:
+   `agent-human-stream --export <uuid>`.
 
 Copy-paste:
 
@@ -340,7 +372,11 @@ Required skill: read ~/.agents/skills/sume-gt-mq/SKILL.md
 EOF
 # Shell description: Grok : <job-slug> (#N)
 cd /path/to/repo && sume-bg-launch --backend grok --name <job-slug> \
+  --until-landed <PR#> --wall-timeout 6h \
   --prompt-file /tmp/sume-grok-prompts/<job-slug>.md -- --effort xhigh
+# Steer the same session later (kills the live holder group first):
+cd /path/to/repo && sume-bg-launch --backend grok --name <job-slug> --resume <uuid> \
+  --until-landed <PR#> --prompt-file /tmp/sume-grok-prompts/<job-slug>-steer.md
 ```
 
 ### Cursor-only — Opus / background-worker monitoring
@@ -949,6 +985,12 @@ When the BP has a PR train, also say:
   land babysit unless the user said otherwise.
 - Do not invent extra slices beyond the BP train.
 
+Launch every Grok land job through `sume-bg-launch … --until-landed <PR#>`
+(§ "Grok transport" 7): the wrapper owns "stay until `origin/main`" and the
+`LANDED:` line; the prompt owns the *method*. The prompt must forbid
+`monitor` / `scheduler_*` (they end the `-p` turn) and tell Grok to block in
+`run_terminal_command` with ≤10 min slices.
+
 The **Grok** land prompt must say: MQ already enqueued → watch draft CI →
 **stay until** `origin/main` has `(#N)` (re-enqueue on eject; do **not**
 STOP at enqueue; do **not** write `HANDOFF: grok-land`) → issue