diff --git a/.prettierignore b/.prettierignore
deleted file mode 100644
index 40a4eaa..0000000
--- a/.prettierignore
+++ /dev/null
@@ -1,13 +0,0 @@
-# Files prettier should skip when run from the repo root.
-# Mirrors the exclusions previously inline in scripts/lint.sh + format.sh.
-
-# Vendored bats companion libraries (third-party, not our style).
-tests/test_helpers/
-
-# Chezmoi templates: contain Go template syntax (`{{ ... }}`) which prettier
-# cannot parse as YAML, Markdown, or JSON.
-*.tmpl
-
-# Build artifacts and runtime state.
-.git/
-.worktrees/
diff --git a/taplo.toml b/taplo.toml
deleted file mode 100644
index b293856..0000000
--- a/taplo.toml
+++ /dev/null
@@ -1,7 +0,0 @@
-include = ["**/*.toml"]
-exclude = [
-  "**/*.tmpl",
-  "**/.git/**",
-  "**/.worktrees/**",
-  "tests/test_helpers/**",
-]
diff --git a/treefmt.toml b/treefmt.toml
index 0e889c3..2daa174 100644
--- a/treefmt.toml
+++ b/treefmt.toml
@@ -1,6 +1,10 @@
 # treefmt: one formatter per file type. Walks the tree, respects .gitignore,
-# and dispatches to each tool. Replaces the hand-rolled shell-file discovery
-# that the mise format/lint tasks used to duplicate.
+# and dispatches to each tool. Owns all file selection so no per-tool ignore
+# files (.prettierignore, taplo.toml) are needed at the repo root.
+#
+# Chezmoi templates (*.tmpl) hold Go template syntax that these formatters
+# cannot parse. Vendored bats libraries under tests/test_helpers are third
+# party and stay unformatted.
 
 [formatter.shfmt]
 command = "shfmt"
@@ -12,9 +16,10 @@ excludes = ["*.tmpl"]
 command = "prettier"
 options = ["--write"]
 includes = ["*.md", "*.yaml", "*.yml", "*.json"]
+excludes = ["*.tmpl", "tests/test_helpers/**"]
 
 [formatter.taplo]
 command = "taplo"
 options = ["fmt"]
 includes = ["*.toml"]
-excludes = ["*.tmpl"]
+excludes = ["*.tmpl", "tests/test_helpers/**"]