diff --git a/.claude/settings.json b/.claude/settings.json
index c69ee1e..c04134f 100644
--- a/.claude/settings.json
+++ b/.claude/settings.json
@@ -9,6 +9,17 @@
         ]
     },
     "hooks": {
+        "PreToolUse": [
+            {
+                "matcher": "Edit|Write|MultiEdit",
+                "hooks": [
+                    {
+                        "type": "command",
+                        "command": "f=$(jq -r '.tool_input.file_path // empty'); case \"$f\" in .matchory/*|*/.matchory/*|.editorconfig|*/.editorconfig) echo \"$f is generated. Refresh it with: uv run matchory-coding-style sync --preset strict\" >&2; exit 2;; esac"
+                    }
+                ]
+            }
+        ],
         "PostToolUse": [
             {
                 "matcher": "Edit|Write",
diff --git a/CLAUDE.md b/CLAUDE.md
index a8e65fb..638e61b 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -1,54 +1,6 @@
 # CLAUDE.md
 
-## Stack
-
-- Python 3.13, managed with [uv](https://docs.astral.sh/uv/)
-- [hatchling](https://hatch.pypa.io/) as the build backend
-- [ruff](https://docs.astral.sh/ruff/) for linting and formatting, configured via the `strict`
-  preset from [`matchory/coding-style`](https://github.com/matchory/coding-style)
-- [pytest](https://docs.pytest.org/) for tests
-
-## Commands
-
-```bash
-uv sync                                         # install dependencies
-uv run pytest                                   # run the test suite
-uv run ruff check .                             # lint
-uv run ruff format .                            # format
-uv run matchory-coding-style verify --strict    # verify the style wiring
-```
-
-`uv run matchory-coding-style verify --strict` is the acceptance test for this repository. It
-must exit 0 before any change is considered done.
-
-## Ruff configuration
-
-Ruff's rules live in `matchory/coding-style`, not in this repository. `pyproject.toml` extends
-`.matchory/ruff.toml`, which in turn extends the `strict` preset.
-
-`.matchory/` and `.editorconfig` are **generated — never hand-edited**. Refresh both with:
-
-```bash
-uv run matchory-coding-style sync --preset strict
-```
-
-Do not edit files under `.matchory/` directly; edits are overwritten the next time `sync` runs.
-
-## Renaming the package
-
-Renaming `matchory-template-python` / `matchory_template` touches `pyproject.toml`'s `name` and
-`[tool.hatch.build.targets.wheel].packages`, the `src/matchory_template/` directory, and the import
-in `tests/test_greeting.py`. Once all four agree, a plain `uv sync` picks up the new name — no
-forced reinstall is needed.
-
-## `tests/__init__.py`
-
-This file is empty on purpose. `strict` selects `INP` (implicit namespace packages), and `INP001`
-fires on `tests/` unless it is a real package. `base.toml`'s `**/tests/**` per-file-ignores cover
-only `S105`/`S106`/`S107`/`PLC0415`, not `INP001`, so the file has to exist. Don't delete it.
-
-## Claude Code hook
-
-`.claude/settings.json` runs `ruff format` on a Python file after every edit. The hook pipes its
-input through `jq`; if `jq` is not installed, the pipeline no-ops instead of failing, so formatting
-silently falls back to whatever runs at commit or CI time.
+- Done means every check in `.github/workflows/ci.yml` passes locally.
+- `.matchory/` and `.editorconfig` are generated. Refresh them with
+  `uv run matchory-coding-style sync --preset strict`. Always pass `--preset strict`: the default is
+  `base`, and CI rejects it.