diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..8ff9834
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,9 @@
+# Generated by the platform on every boot — `servers/ensure-tool-loader.ts` writes it, and it is derived
+# from source in the platform repository rather than authored here. Tracking it would mean a fork carrying
+# a build artifact and getting a conflict on it whenever the platform's copy changed.
+#
+# This is the ONLY thing in here that is not either core's or the owner's. A plugin's capabilities are read
+# from the plugin's own directory and never copied in — see platform/docs/plugin-capabilities.md — so
+# nothing else needs ignoring, and anything that turns up untracked here is worth looking at rather than
+# adding to this file.
+/extensions/