diff --git a/doc/DEVELOPING.md b/doc/DEVELOPING.md
index c73d22e5..ffbb7fa3 100644
--- a/doc/DEVELOPING.md
+++ b/doc/DEVELOPING.md
@@ -298,3 +298,9 @@ State behavior for this smoke script:
 
 - defaults to isolated config dir `~/.openclaw-paperclip-smoke`
 - resets smoke agent state each run by default (`OPENCLAW_RESET_STATE=1`) to avoid stale provider/auth drift
+
+Networking behavior for this smoke script:
+
+- auto-detects and prints a Paperclip host URL reachable from inside OpenClaw Docker
+- default container-side host alias is `host.docker.internal` (override with `PAPERCLIP_HOST_FROM_CONTAINER` / `PAPERCLIP_HOST_PORT`)
+- if Paperclip rejects container hostnames in authenticated/private mode, allow `host.docker.internal` via `pnpm paperclipai allowed-hostname host.docker.internal` and restart Paperclip
diff --git a/docs/guides/openclaw-docker-setup.md b/docs/guides/openclaw-docker-setup.md
index 50de462b..bf8d1496 100644
--- a/docs/guides/openclaw-docker-setup.md
+++ b/docs/guides/openclaw-docker-setup.md
@@ -42,6 +42,7 @@ What this command does:
 - writes isolated smoke config under `~/.openclaw-paperclip-smoke/openclaw.json` and Docker `.env`
 - pins agent model defaults to OpenAI (`openai/gpt-5.2` with OpenAI fallback)
 - starts `openclaw-gateway` via Compose (with required `/tmp` tmpfs override)
+- probes and prints a Paperclip host URL that is reachable from inside OpenClaw Docker
 - waits for health and prints:
   - `http://127.0.0.1:18789/#token=...`
 - disables Control UI device pairing by default for local smoke ergonomics
@@ -60,6 +61,8 @@ Environment knobs:
 - `OPENCLAW_MODEL_FALLBACK` (default `openai/gpt-5.2-chat-latest`)
 - `OPENCLAW_CONFIG_DIR` (default `~/.openclaw-paperclip-smoke`)
 - `OPENCLAW_RESET_STATE=1` (default) resets smoke agent state on each run to avoid stale auth/session drift
+- `PAPERCLIP_HOST_PORT` (default `3100`)
+- `PAPERCLIP_HOST_FROM_CONTAINER` (default `host.docker.internal`)
 
 ### Authenticated mode
 
@@ -74,6 +77,15 @@ PAPERCLIP_COOKIE="your_session_cookie=..." pnpm smoke:openclaw-join
 ### Network topology tips
 
 - Local same-host smoke: default callback uses `http://127.0.0.1:<port>/webhook`.
+- Inside OpenClaw Docker, `127.0.0.1` points to the container itself, not your host Paperclip server.
+- For invite/onboarding URLs consumed by OpenClaw in Docker, use the script-printed Paperclip URL (typically `http://host.docker.internal:3100`).
+- If Paperclip rejects the container-visible host with a hostname error, allow it from host:
+
+```bash
+pnpm paperclipai allowed-hostname host.docker.internal
+```
+
+Then restart Paperclip and rerun the smoke script.
 - Docker/remote OpenClaw: prefer a reachable hostname (Docker host alias, Tailscale hostname, or public domain).
 - Authenticated/private mode: ensure hostnames are in the allowed list when required:
 
diff --git a/scripts/smoke/openclaw-docker-ui.sh b/scripts/smoke/openclaw-docker-ui.sh
index c86348c8..234d7d91 100755
--- a/scripts/smoke/openclaw-docker-ui.sh
+++ b/scripts/smoke/openclaw-docker-ui.sh
@@ -39,6 +39,8 @@ OPENCLAW_DISABLE_DEVICE_AUTH="${OPENCLAW_DISABLE_DEVICE_AUTH:-1}"
 OPENCLAW_MODEL_PRIMARY="${OPENCLAW_MODEL_PRIMARY:-openai/gpt-5.2}"
 OPENCLAW_MODEL_FALLBACK="${OPENCLAW_MODEL_FALLBACK:-openai/gpt-5.2-chat-latest}"
 OPENCLAW_RESET_STATE="${OPENCLAW_RESET_STATE:-1}"
+PAPERCLIP_HOST_PORT="${PAPERCLIP_HOST_PORT:-3100}"
+PAPERCLIP_HOST_FROM_CONTAINER="${PAPERCLIP_HOST_FROM_CONTAINER:-host.docker.internal}"
 
 case "$OPENCLAW_DISABLE_DEVICE_AUTH" in
   1|true|TRUE|True|yes|YES|Yes)
@@ -138,6 +140,8 @@ services:
   openclaw-gateway:
     tmpfs:
       - /tmp:exec,size=512M
+    extra_hosts:
+      - "host.docker.internal:host-gateway"
   openclaw-cli:
     tmpfs:
       - /tmp:exec,size=512M
@@ -150,6 +154,20 @@ compose() {
     "$@"
 }
 
+detect_paperclip_base_url() {
+  local bridge_gateway candidate health_url
+  bridge_gateway="$(docker network inspect openclaw-docker_default --format '{{(index .IPAM.Config 0).Gateway}}' 2>/dev/null || true)"
+  for candidate in "$PAPERCLIP_HOST_FROM_CONTAINER" "$bridge_gateway"; do
+    [[ -n "$candidate" ]] || continue
+    health_url="http://${candidate}:${PAPERCLIP_HOST_PORT}/api/health"
+    if compose exec -T openclaw-gateway node -e "fetch('${health_url}').then((r)=>process.exit(r.ok?0:1)).catch(()=>process.exit(1))" >/dev/null 2>&1; then
+      echo "http://${candidate}:${PAPERCLIP_HOST_PORT}"
+      return 0
+    fi
+  done
+  return 1
+}
+
 log "starting OpenClaw gateway container"
 compose up -d openclaw-gateway
 
@@ -168,6 +186,7 @@ if [[ "$READY" != "1" ]]; then
   fail "gateway did not become healthy in ${OPENCLAW_WAIT_SECONDS}s"
 fi
 
+paperclip_base_url="$(detect_paperclip_base_url || true)"
 dashboard_output="$(compose run --rm openclaw-cli dashboard --no-open)"
 dashboard_url="$(grep -Eo 'https?://[^[:space:]]+#token=[^[:space:]]+' <<<"$dashboard_output" | head -n1 || true)"
 if [[ -z "$dashboard_url" ]]; then
@@ -192,6 +211,23 @@ Model:
   ${OPENCLAW_MODEL_PRIMARY} (fallback: ${OPENCLAW_MODEL_FALLBACK})
 State:
   OPENCLAW_RESET_STATE=$OPENCLAW_RESET_STATE
+Paperclip URL for OpenClaw container:
+EOF
+  if [[ -n "$paperclip_base_url" ]]; then
+    cat <<EOF
+  $paperclip_base_url
+  (Use this base URL for invite/onboarding links from inside OpenClaw Docker.)
+EOF
+  else
+    cat <<EOF
+  Auto-detect failed. Try: http://host.docker.internal:${PAPERCLIP_HOST_PORT}
+  (Do not use http://127.0.0.1:${PAPERCLIP_HOST_PORT} inside the container.)
+  If Paperclip rejects the host, run on host machine:
+    pnpm paperclipai allowed-hostname host.docker.internal
+  Then restart Paperclip and re-run this script.
+EOF
+  fi
+  cat <<EOF
 
 Useful commands:
   docker compose -f "$OPENCLAW_DOCKER_DIR/docker-compose.yml" -f "$COMPOSE_OVERRIDE" logs -f openclaw-gateway
@@ -208,6 +244,23 @@ Model:
   ${OPENCLAW_MODEL_PRIMARY} (fallback: ${OPENCLAW_MODEL_FALLBACK})
 State:
   OPENCLAW_RESET_STATE=$OPENCLAW_RESET_STATE
+Paperclip URL for OpenClaw container:
+EOF
+  if [[ -n "$paperclip_base_url" ]]; then
+    cat <<EOF
+  $paperclip_base_url
+  (Use this base URL for invite/onboarding links from inside OpenClaw Docker.)
+EOF
+  else
+    cat <<EOF
+  Auto-detect failed. Try: http://host.docker.internal:${PAPERCLIP_HOST_PORT}
+  (Do not use http://127.0.0.1:${PAPERCLIP_HOST_PORT} inside the container.)
+  If Paperclip rejects the host, run on host machine:
+    pnpm paperclipai allowed-hostname host.docker.internal
+  Then restart Paperclip and re-run this script.
+EOF
+  fi
+  cat <<EOF
 
 Useful commands:
   docker compose -f "$OPENCLAW_DOCKER_DIR/docker-compose.yml" -f "$COMPOSE_OVERRIDE" logs -f openclaw-gateway