diff --git a/services/node-agent/index.js b/services/node-agent/index.js
index 5d80378..79a8dc1 100644
--- a/services/node-agent/index.js
+++ b/services/node-agent/index.js
@@ -1,5 +1,6 @@
 import express from 'express';
 import os      from 'os';
+import fs      from 'fs';
 
 const MAM_API_URL  = (process.env.MAM_API_URL  || 'http://localhost:3000').replace(/\/$/, '');
 const NODE_TOKEN   =  process.env.NODE_TOKEN   || '';
@@ -49,12 +50,48 @@ function getIp() {
   return null;
 }
 
+// ── Hardware detection ────────────────────────────────────────────────────
+// GPU_COUNT env var overrides filesystem detection (useful when /dev not mapped into container)
+// BMD_COUNT env var similarly overrides Blackmagic DeckLink detection
+function detectHardware() {
+  const capabilities = { gpus: [], blackmagic: [] };
+
+  const gpuOverride = parseInt(process.env.GPU_COUNT || '-1', 10);
+  if (gpuOverride >= 0) {
+    for (let i = 0; i < gpuOverride; i++) {
+      capabilities.gpus.push({ device: `/dev/nvidia${i}`, type: 'nvidia', index: i });
+    }
+  } else {
+    for (let i = 0; i < 16; i++) {
+      try {
+        fs.accessSync(`/dev/nvidia${i}`, fs.constants.F_OK);
+        capabilities.gpus.push({ device: `/dev/nvidia${i}`, type: 'nvidia', index: i });
+      } catch (_) { break; }
+    }
+  }
+
+  const bmdOverride = parseInt(process.env.BMD_COUNT || '-1', 10);
+  if (bmdOverride >= 0) {
+    for (let i = 0; i < bmdOverride; i++) {
+      capabilities.blackmagic.push({ device: `/dev/blackmagic/dv${i}`, index: i });
+    }
+  } else {
+    try {
+      const bmdEntries = fs.readdirSync('/dev/blackmagic');
+      capabilities.blackmagic = bmdEntries.map(d => ({ device: `/dev/blackmagic/${d}` }));
+    } catch (_) {}
+  }
+
+  return capabilities;
+}
+
 // ── Heartbeat ─────────────────────────────────────────────────────────────
 async function heartbeat() {
-  const cpu_usage  = await sampleCpu();
-  const totalMem   = os.totalmem();
-  const freeMem    = os.freemem();
-  const ip_address = getIp();
+  const cpu_usage    = await sampleCpu();
+  const totalMem     = os.totalmem();
+  const freeMem      = os.freemem();
+  const ip_address   = getIp();
+  const capabilities = detectHardware();
 
   const payload = {
     hostname:     os.hostname(),
@@ -65,6 +102,7 @@ async function heartbeat() {
     cpu_usage,
     mem_used_mb:  Math.round((totalMem - freeMem) / 1048576),
     mem_total_mb: Math.round(totalMem / 1048576),
+    capabilities,
   };
 
   const headers = { 'Content-Type': 'application/json' };
@@ -78,9 +116,11 @@ async function heartbeat() {
       signal:  AbortSignal.timeout(8000),
     });
     if (res.ok) {
+      const gpuStr = capabilities.gpus.length ? `  gpu=${capabilities.gpus.length}` : '';
+      const bmdStr = capabilities.blackmagic.length ? `  bmd=${capabilities.blackmagic.length}` : '';
       process.stdout.write(
         `[hb] ${payload.hostname}  cpu=${cpu_usage}%  ` +
-        `mem=${payload.mem_used_mb}/${payload.mem_total_mb}MB\n`
+        `mem=${payload.mem_used_mb}/${payload.mem_total_mb}MB${gpuStr}${bmdStr}\n`
       );
     } else {
       const txt = await res.text().catch(() => '');