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docs/snippets/go/plugins/plugin_extractor.md

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+<!-- snippet:skip reason="Go bindings do not support custom document extractor plugins" -->
+```markdown title="Markdown"
+!!! note "Not Supported"
+The Go binding is a thin CGO wrapper and does not currently support
+custom document extractors. Custom plugins must be implemented in Rust.
+
+    See the [Rust plugin documentation](../../rust/plugins/plugin_extractor.md) for details on creating custom document extractors.
+
+    Go currently supports:
+    - **PostProcessor** - Transform extraction results
+    - **Validator** - Validate extraction results
+    - **OcrBackend** - Custom OCR implementations
+```