diff --git a/tests/ClawdDotNet.Web.Tests/McpSocketTests.cs b/tests/ClawdDotNet.Web.Tests/McpSocketTests.cs
index 68b57ef..fb03419 100644
--- a/tests/ClawdDotNet.Web.Tests/McpSocketTests.cs
+++ b/tests/ClawdDotNet.Web.Tests/McpSocketTests.cs
@@ -165,14 +165,13 @@ public sealed class McpSocketTests : IDisposable
 
         var agentDir = Path.Combine(host.InstancePath, "Agents", "Agent-coder");
         Directory.CreateDirectory(Path.Combine(agentDir, "Workspace"));
-        const string script = """
-            printf '%s\n' \
-              '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2025-06-18","capabilities":{},"clientInfo":{"name":"t","version":"1"}}}' \
-              '{"jsonrpc":"2.0","id":2,"method":"tools/list"}' \
-              '{"jsonrpc":"2.0","id":3,"method":"tools/call","params":{"name":"Echo","arguments":{}}}' \
-              | "$CLAWD_HELPER" --mcp-bridge --socket "$CLAWD_MCP_SOCKET"
-            echo done > /work/result.txt
-            """;
+        // One command per line: the file's line endings must not decide what the shell sees.
+        var script = string.Join("\n",
+            """m1='{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2025-06-18","capabilities":{},"clientInfo":{"name":"t","version":"1"}}}'""",
+            """m2='{"jsonrpc":"2.0","id":2,"method":"tools/list"}'""",
+            """m3='{"jsonrpc":"2.0","id":3,"method":"tools/call","params":{"name":"Echo","arguments":{}}}'""",
+            """printf '%s\n' "$m1" "$m2" "$m3" | "$CLAWD_HELPER" --mcp-bridge --socket "$CLAWD_MCP_SOCKET" """,
+            "echo done > /work/result.txt");
         var agent = new AgentConfig
         {
             AgentId = "coder", AgentDir = agentDir, WorkspacePath = Path.Combine(agentDir, "Workspace"),