diff --git a/test/integration/runtime-restart-on-config.test.ts b/test/integration/runtime-restart-on-config.test.ts
new file mode 100644
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--- /dev/null
+++ b/test/integration/runtime-restart-on-config.test.ts
@@ -0,0 +1,209 @@
+/**
+ * A running tool runtime picks up a settings change — novox/hq 04-ISSUES/009, and its fix.
+ *
+ * A runtime reads its settings-merged config file once, at start. Change the settings on an
+ * already-running runtime and, without this, the container keeps the value it read: its spec did
+ * not move (a mounted file's content is not part of it) so the host left it alone, and every check
+ * passed while the mesh did the old thing. The fix gives a container `restart-on`, the same field a
+ * service has: the runtime names its config resource, and the host recreates the container when that
+ * resource changed this pass.
+ *
+ * This assigns grafana configured by settings, then changes the token and pushes again, and asserts
+ * the container was replaced (a new container id) and the config on disk carries the new value.
+ * It builds the host from source (no --no-build), because the behaviour under test is the host's.
+ *
+ *   MESH_LAB_HOST_BINARY=.../mesh-host   MESH_LAB_BUNDLE=.../examples/substrate-first-node.lock
+ *   scripts/build-module-runtime.sh grafana builds mesh-runtime-grafana:development, which
+ *   scenarios/grafana-node.yml stocks.
+ */
+
+import { test, before, after } from "node:test";
+import assert from "node:assert/strict";
+import { existsSync, readFileSync } from "node:fs";
+import { loadScenario } from "../../src/declaration/parse.ts";
+import { raise } from "../../src/lifecycle/raise.ts";
+import { destroy, exec } from "../../src/lifecycle/operate.ts";
+import { hostBinaryPath, HOST_PATH } from "../../src/lifecycle/place.ts";
+import { labIsUsable, destroyAll } from "./harness.ts";
+
+const capability = await labIsUsable();
+const binary = hostBinaryPath();
+const bundle = process.env["MESH_LAB_BUNDLE"] ?? "";
+
+const skip = !capability.usable
+  ? `lab not usable: ${capability.why}`
+  : !binary || !existsSync(binary)
+    ? "MESH_LAB_HOST_BINARY is not set to a built mesh-host"
+    : !bundle || !existsSync(bundle)
+      ? "MESH_LAB_BUNDLE is not set to a substrate bundle (mesh-host examples/)"
+      : false;
+
+const SCENARIO = "grafana-node";
+const MACHINE = "anchor";
+
+let instanceId = "";
+let stocked: string[] = [];
+
+function quote(s: string): string {
+  return `'${s.replaceAll("'", `'\\''`)}'`;
+}
+
+async function on(command: string, timeoutMs?: number): Promise<{ out: string; ok: boolean }> {
+  const { stdout } = await exec(instanceId, MACHINE, [
+    "sh", "-c", `exec 2>&1\n${command}\necho "__exit=$?"`,
+  ], timeoutMs);
+  const marker = stdout.lastIndexOf("__exit=");
+  if (marker < 0) return { out: stdout, ok: false };
+  return { out: stdout.slice(0, marker), ok: stdout.slice(marker + 7).trim() === "0" };
+}
+
+async function must(command: string, timeoutMs?: number): Promise<string> {
+  const { out, ok } = await on(command, timeoutMs);
+  if (!ok) throw new Error(`${MACHINE}: ${command}\n${out}`);
+  return out;
+}
+
+async function mesh(command: string, timeoutMs?: number): Promise<string> {
+  return must(`docker exec mesh-control /mesh-control ${command}`, timeoutMs);
+}
+
+function pinned(repository: string): string {
+  const found = stocked.find((r) => r.slice(r.indexOf("/") + 1, r.indexOf("@")) === repository);
+  assert.ok(found, `the scenario stocks no ${repository}; it serves ${stocked.join(", ")}`);
+  return found;
+}
+
+function bundleFor(images: string[]): string {
+  let text = readFileSync(bundle, "utf8");
+  for (const ref of images) {
+    const repository = ref.slice(ref.indexOf("/") + 1, ref.indexOf("@"));
+    const escaped = repository.replaceAll("/", "\\/").replaceAll(".", "\\.");
+    text = text.replaceAll(new RegExp(`[A-Za-z0-9_.:-]+\\/${escaped}@sha256:[0-9a-f]+`, "g"), ref);
+  }
+  return text;
+}
+
+function tokenFrom(said: string): string {
+  const found = said.split("\n").map((l) => l.trim()).find((l) => l.length > 100 && !l.includes(" "));
+  assert.ok(found, `no token in:\n${said}`);
+  return found;
+}
+
+async function settled(withinMs = 480_000): Promise<void> {
+  const until = Date.now() + withinMs;
+  let last = "";
+  while (Date.now() < until) {
+    const asked = await on(`docker exec mesh-control /mesh-control status --json`);
+    if (asked.ok) {
+      try {
+        const state = JSON.parse(asked.out) as {
+          wrong: { node: string; outcome: string }[];
+          waiting: { node: string }[];
+          reported: { node: string; outcome: string; current: boolean }[];
+        };
+        const bad = state.wrong.find((w) => w.node === MACHINE);
+        if (bad) throw new Error(`${MACHINE} did not apply what it was sent: ${bad.outcome}\n${asked.out}`);
+        const word = state.reported.find((r) => r.node === MACHINE);
+        if (!state.waiting.some((w) => w.node === MACHINE) && word?.outcome === "applied" && word.current) return;
+        last = asked.out;
+      } catch (err) {
+        if (err instanceof Error && err.message.includes("did not apply")) throw err;
+        last = asked.out;
+      }
+    }
+    await new Promise((r) => setTimeout(r, 5000));
+  }
+  throw new Error(`${MACHINE} never caught up within ${Math.round(withinMs / 1000)}s. Last:\n${last}`);
+}
+
+async function setToken(token: string): Promise<void> {
+  const settings = JSON.stringify({ url: "http://127.0.0.1:3000", token });
+  await must(`printf %s ${quote(settings)} > /tmp/s.json && docker cp /tmp/s.json mesh-control:/s.json`);
+  await mesh(`settings set grafana /s.json --node ${MACHINE}`);
+}
+
+async function containerId(): Promise<string> {
+  return (await must(`docker inspect mesh-grafana --format '{{.Id}}'`)).trim();
+}
+
+before(async () => {
+  if (skip) return;
+
+  const raised = await raise(loadScenario(`scenarios/${SCENARIO}.yml`), {
+    onProgress: (m) => console.log(`raise: ${m}`),
+  });
+  instanceId = raised.instanceId;
+  stocked = raised.images;
+
+  await must(`cat > /tmp/substrate.lock <<'MESHBUNDLE'\n${bundleFor(raised.images)}\nMESHBUNDLE`);
+  await must(`${HOST_PATH} apply /tmp/substrate.lock`, 600_000);
+  const up = await must(`docker ps --format '{{.Names}}'`);
+  for (const c of ["mesh-store", "mesh-broker", "mesh-control"]) {
+    assert.match(up, new RegExp(c), `the substrate did not raise ${c}:\n${up}`);
+  }
+
+  await mesh(`node add ${MACHINE}`);
+  const token = tokenFrom(await mesh(`token issue --node ${MACHINE}`));
+  await must(`${HOST_PATH} enrol --token ${quote(token)}`);
+  await must(`nohup ${HOST_PATH} run > /var/log/mesh-host.log 2>&1 & sleep 3`);
+}, { timeout: 1_800_000 });
+
+after(async () => {
+  if (instanceId) await destroy(instanceId);
+  await destroyAll(`${SCENARIO}-`);
+}, { timeout: 600_000 });
+
+test("a running runtime is recreated when its settings change, and reads the new value", {
+  skip, timeout: 900_000,
+}, async () => {
+  const manifest = JSON.stringify({
+    module: "grafana",
+    version: "1",
+    emits: ["module.grafana.alert.firing"],
+    "own-secrets": { broker: "/var/lib/mesh/grafana/broker" },
+    resources: [
+      { id: "mesh-state", type: "directory", path: "/var/lib/mesh/grafana", mode: "0700" },
+      { id: "runtime-config", type: "file", path: "/var/lib/mesh/grafana/config.json", mode: "0600", content: "{}\n", merge: "json" },
+      {
+        id: "runtime", type: "container", name: "mesh-grafana", image: pinned("mesh-runtime-grafana"),
+        network: "host",
+        "restart-on": ["runtime-config"],
+        volumes: [
+          "/var/lib/mesh/grafana/broker:/run/secrets/broker:ro",
+          "/var/lib/mesh/grafana/config.json:/run/config/config.json:ro",
+        ],
+        env: { MESH_BROKER_FILE: "/run/secrets/broker", MESH_GRAFANA_CONFIG_FILE: "/run/config/config.json" },
+      },
+    ],
+  });
+  await must(`printf %s ${quote(manifest)} > /tmp/grafana.json && docker cp /tmp/grafana.json mesh-control:/grafana.json`);
+  await mesh("module add /grafana.json");
+
+  await setToken("token-alpha");
+  await mesh(`module issue grafana --node ${MACHINE}`);
+  await mesh(`assign ${MACHINE} grafana`);
+  await mesh(`push ${MACHINE}`);
+  await settled();
+
+  const before = await containerId();
+  const configBefore = await must(`cat /var/lib/mesh/grafana/config.json`);
+  assert.match(configBefore, /token-alpha/, `first settings not rendered:\n${configBefore}`);
+
+  // Change the setting on the already-running runtime, and push. Nothing about the container's
+  // spec changes — only the content of the file it mounts.
+  await setToken("token-bravo");
+  await mesh(`push ${MACHINE}`);
+  await settled();
+
+  const configAfter = await must(`cat /var/lib/mesh/grafana/config.json`);
+  assert.match(configAfter, /token-bravo/, `the settings change did not re-render the config:\n${configAfter}`);
+
+  const after = await containerId();
+  assert.notEqual(after, before,
+    `the runtime was NOT recreated on a config change (issue 009 not fixed): id stayed ${before}\n` +
+      `host log:\n${(await on(`grep -i grafana /var/log/mesh-host.log | tail -10`)).out}`);
+
+  // And it is running on the new container, so the process re-read the new config.
+  const running = await must(`docker ps --format '{{.Names}}'`);
+  assert.match(running, /mesh-grafana/, "the recreated runtime is not running");
+});