From e645455b22854c9d0ff5a871451f01c10a318383 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alejandro=20Guti=C3=A9rrez?=
 <35082514+alezmad@users.noreply.github.com>
Date: Wed, 8 Apr 2026 15:34:29 +0100
Subject: [PATCH] fix(runner): run Python venv binaries directly, not via node

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---
 apps/runner/supervisor.mjs | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/apps/runner/supervisor.mjs b/apps/runner/supervisor.mjs
index 0a30720..b8c6240 100644
--- a/apps/runner/supervisor.mjs
+++ b/apps/runner/supervisor.mjs
@@ -117,11 +117,17 @@ async function initMcp(svc) {
 // --- Spawn ---
 
 function spawnService(svc) {
-  // npx packages have a pre-resolved binary
+  // npx/uvx packages have a pre-resolved binary
   let cmd, args;
   if (svc._npxBin) {
-    cmd = "node";
-    args = [svc._npxBin];
+    // Python venv binaries are scripts with shebangs — run directly
+    if (svc.runtime === "python") {
+      cmd = svc._npxBin;
+      args = [];
+    } else {
+      cmd = "node";
+      args = [svc._npxBin];
+    }
   } else {
     ({ cmd, args } = detectEntry(svc.sourcePath, svc.runtime));
   }