diff --git a/deploy/sentry-slack-alert.sh b/deploy/sentry-slack-alert.sh
index 54ddc56..d98953a 100755
--- a/deploy/sentry-slack-alert.sh
+++ b/deploy/sentry-slack-alert.sh
@@ -2,7 +2,7 @@
 # Route every wizwar issue to a Slack channel: new issues (any level or
 # priority), regressions, and reappearances. Creates one Sentry workflow
 # via the alerts API. The token never leaves your shell:
-#   SENTRY_TOKEN=sntryu_... deploy/sentry-slack-alert.sh [#channel]
+#   SENTRY_TOKEN=sntryu_... SLACK_CHANNEL_ID=C... deploy/sentry-slack-alert.sh [#channel]
 # The token needs the alerts:write scope (an org auth token from
 # https://locallygrownnet.sentry.io/settings/auth-tokens/), and Slack must
 # already be connected to the org under Settings → Integrations.
@@ -14,27 +14,22 @@ CHANNEL="${1:-#wizwar-notifications}"
 API="https://us.sentry.io/api/0/organizations/$ORG"
 AUTH="Authorization: Bearer $SENTRY_TOKEN"
 
-echo "looking up the Slack integration…"
-SLACK_ID=$(curl -s "$API/integrations/?provider_key=slack" -H "$AUTH" | python3 -c '
+# What the API wants, learned the hard way: the Slack action needs the
+# channel's ID as well as its name, the project's detector is found by
+# project id, and the binding is a PUT of the workflow with detectorIds.
+SLACK_ID="${SENTRY_SLACK_INTEGRATION:-345334}"
+CHANNEL_ID="${SLACK_CHANNEL_ID:?SLACK_CHANNEL_ID=C... is required (the Slack ID of the channel)}"
+PROJECT_ID="${SENTRY_PROJECT_ID:-4512011462049793}"
+echo "Slack integration $SLACK_ID; project $PROJECT_ID; channel $CHANNEL ($CHANNEL_ID)"
+
+DETECTOR_ID=$(curl -s "$API/detectors/?project=$PROJECT_ID" -H "$AUTH" | python3 -c '
 import json, sys
 rows = json.load(sys.stdin)
-rows = rows if isinstance(rows, list) else []
-for i in rows:
-    if i.get("provider", {}).get("key") == "slack" and i.get("status") == "active":
-        print(i["id"]); break')
-if [ -z "$SLACK_ID" ]; then
-  echo "no active Slack integration on the org — connect Slack first at https://$ORG.sentry.io/settings/integrations/slack/" >&2
-  exit 1
-fi
-echo "Slack integration $SLACK_ID; project $PROJECT; channel $CHANNEL"
+for d in (rows if isinstance(rows, list) else []):
+    if str(d.get("projectId")) == sys.argv[1] and d.get("type") == "error": print(d["id"]); break' "$PROJECT_ID")
+[ -n "$DETECTOR_ID" ] || { echo "no error detector for project $PROJECT_ID" >&2; exit 1; }
 
-PROJECT_ID=$(curl -s "$API/projects/" -H "$AUTH" | python3 -c '
-import json, sys
-for p in json.load(sys.stdin):
-    if p.get("slug") == sys.argv[1]: print(p["id"]); break' "$PROJECT")
-[ -n "$PROJECT_ID" ] || { echo "project $PROJECT not found in $ORG" >&2; exit 1; }
-
-PAYLOAD=$(CHANNEL="$CHANNEL" SLACK_ID="$SLACK_ID" python3 -c '
+PAYLOAD=$(CHANNEL="$CHANNEL" CHANNEL_ID="$CHANNEL_ID" SLACK_ID="$SLACK_ID" DETECTOR_ID="$DETECTOR_ID" python3 -c '
 import json, os
 print(json.dumps({
   "name": "Wiz-War → Slack",
@@ -57,10 +52,11 @@ print(json.dumps({
       "type": "slack",
       "integrationId": int(os.environ["SLACK_ID"]),
       "data": {},
-      "config": {"targetType": "specific", "targetIdentifier": None, "targetDisplay": os.environ["CHANNEL"]},
+      "config": {"targetType": "specific", "targetIdentifier": os.environ["CHANNEL_ID"], "targetDisplay": os.environ["CHANNEL"]},
       "status": "active",
     }],
   }],
+  "detectorIds": [int(os.environ["DETECTOR_ID"])],
 }))')
 
 echo "creating the workflow…"
@@ -72,19 +68,6 @@ if [ "$CODE" != "201" ]; then
 fi
 WORKFLOW_ID=$(printf '%s' "$BODY" | python3 -c 'import json,sys; print(json.load(sys.stdin).get("id",""))')
 echo "created workflow $WORKFLOW_ID"
-
-# Bind it to the project's issues via a detector connection, so it fires
-# for wizwar rather than sitting unattached.
-echo "connecting it to $PROJECT's issues…"
-DETECTOR_ID=$(curl -s "$API/detectors/?project=$PROJECT_ID&type=error" -H "$AUTH" | python3 -c '
-import json, sys
-rows = json.load(sys.stdin)
-rows = rows if isinstance(rows, list) else []
-for d in rows:
-    if d.get("type") in ("error", "issue"): print(d["id"]); break')
-if [ -n "$DETECTOR_ID" ]; then
-  curl -s -o /dev/null -w "detector link: %{http_code}\n" -X PUT "$API/detectors/$DETECTOR_ID/workflows/" -H "$AUTH" -H "Content-Type: application/json" -d "{\"workflowIds\": [$WORKFLOW_ID]}"
-else
-  echo "no error detector found for $PROJECT; connect the workflow to the project in the Alerts UI" >&2
-fi
+# A fresh workflow may come back without its detectors; bind them by PUT.
+curl -s -o /dev/null -w "bound to detector $DETECTOR_ID: %{http_code}\n" -X PUT "$API/workflows/$WORKFLOW_ID/" -H "$AUTH" -H "Content-Type: application/json" -d "$PAYLOAD"
 echo "done: https://$ORG.sentry.io/monitors/alerts/$WORKFLOW_ID/"