diff --git a/agent.ps1 b/agent.ps1
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+# PS-Proxy agent entrypoint.
+# The mature implementation packages a precompiled C# agent DLL into a single PS1
+# and loads it with [System.Reflection.Assembly]::Load(byte[]) instead of Add-Type.
+# Build release/agent.ps1 on Windows with: powershell -ExecutionPolicy Bypass -File tools/build-agent.ps1
+throw "This source checkout contains the agent source and loader template. Use release/agent.ps1 from a packaged release, or run tools/build-agent.ps1 on Windows to generate it."