diff --git a/.prettierignore b/.prettierignore
index ab6b0b5..da5247c 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -15,3 +15,8 @@ fixtures/import/*.src.html
 # as pandoc reads the exported document back — Prettier would break them.
 fixtures/export/*.expected.md
 packages/plugins/*/vendor/
+# Agent/tool config generated by Claude Code + `graphify claude install`
+# (regenerated on demand, not hand-formatted source) — keep out of Prettier so
+# a re-install never breaks the lint gate.
+CLAUDE.md
+.claude/