diff --git a/src/ClaudeDo.Worker/AzureDevOps/AzureDevOpsClient.cs b/src/ClaudeDo.Worker/AzureDevOps/AzureDevOpsClient.cs
index a852fd2c..841d3aea 100644
--- a/src/ClaudeDo.Worker/AzureDevOps/AzureDevOpsClient.cs
+++ b/src/ClaudeDo.Worker/AzureDevOps/AzureDevOpsClient.cs
@@ -56,12 +56,13 @@ public sealed class AzureDevOpsClient
     public static string AuthHeaderValue(string pat) => "Basic " + Convert.ToBase64String(Encoding.ASCII.GetBytes(":" + pat));
 
     /// <summary>
-    /// Environment for a git network call: never prompt (a background process would hang), and hand the PAT
+    /// Environment for a git network call: never prompt — neither the terminal nor Git Credential Manager's GUI
+    /// (a background process would hang on either) — and hand the PAT
     /// over as <c>http.extraHeader</c> via <c>GIT_CONFIG_*</c> so it never shows up in a command line.
     /// </summary>
     public static IReadOnlyDictionary<string, string> GitAuthEnv(string? pat)
     {
-        var env = new Dictionary<string, string> { ["GIT_TERMINAL_PROMPT"] = "0" };
+        var env = new Dictionary<string, string> { ["GIT_TERMINAL_PROMPT"] = "0", ["GCM_INTERACTIVE"] = "never" };
         if (!string.IsNullOrEmpty(pat))
         {
             env["GIT_CONFIG_COUNT"] = "1";
diff --git a/tests/ClaudeDo.Worker.Tests/AzureDevOps/AzureDevOpsClientTests.cs b/tests/ClaudeDo.Worker.Tests/AzureDevOps/AzureDevOpsClientTests.cs
index 4956d1b7..8bcc54e7 100644
--- a/tests/ClaudeDo.Worker.Tests/AzureDevOps/AzureDevOpsClientTests.cs
+++ b/tests/ClaudeDo.Worker.Tests/AzureDevOps/AzureDevOpsClientTests.cs
@@ -61,6 +61,7 @@ public sealed class AzureDevOpsClientTests : IDisposable
         var env = AzureDevOpsClient.GitAuthEnv("geheim");
 
         Assert.Equal("0", env["GIT_TERMINAL_PROMPT"]);
+        Assert.Equal("never", env["GCM_INTERACTIVE"]);
         Assert.Equal("1", env["GIT_CONFIG_COUNT"]);
         Assert.Equal("http.extraHeader", env["GIT_CONFIG_KEY_0"]);
         Assert.Equal("Authorization: Basic OmdlaGVpbQ==", env["GIT_CONFIG_VALUE_0"]);