From c67d5277c3bd9ea72920d521f609ebe71d4327f3 Mon Sep 17 00:00:00 2001
From: Echo <echoassistant50@gmail.com>
Date: Sun, 15 Feb 2026 09:24:38 -0500
Subject: [PATCH] fix(mattermost): derive slash callback port from runtime env

---
 extensions/mattermost/src/mattermost/monitor.ts | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/extensions/mattermost/src/mattermost/monitor.ts b/extensions/mattermost/src/mattermost/monitor.ts
index d0524d3a2db..805fed383ab 100644
--- a/extensions/mattermost/src/mattermost/monitor.ts
+++ b/extensions/mattermost/src/mattermost/monitor.ts
@@ -229,7 +229,15 @@ export async function monitorMattermostProvider(opts: MonitorMattermostOpts = {}
   if (slashEnabled) {
     try {
       const teams = await fetchMattermostUserTeams(client, botUserId);
-      const gatewayPort = cfg.gateway?.port ?? 3015;
+
+      // Use the *runtime* listener port when available (e.g. `openclaw gateway run --port <port>`).
+      // The gateway sets OPENCLAW_GATEWAY_PORT when it boots, but the config file may still contain
+      // a different port.
+      const envPortRaw = process.env.OPENCLAW_GATEWAY_PORT?.trim();
+      const envPort = envPortRaw ? Number.parseInt(envPortRaw, 10) : NaN;
+      const gatewayPort =
+        Number.isFinite(envPort) && envPort > 0 ? envPort : (cfg.gateway?.port ?? 3015);
+
       const callbackUrl = resolveCallbackUrl({
         config: slashConfig,
         gatewayPort,