jdx Configure hk
Start with hk --version, the project's tool declarations, and the configuration hk actually selects. Check HK_FILE first: when set, it replaces the normal candidate list (a relative path is searched from the working directory upward). Otherwise, walk upward from the working directory, checking hk.local.pkl, .config/hk.local.pkl, hk.pkl, then .config/hk.pkl at each level. Legacy hk.toml, hk.yaml, hk.yml, and hk.json are checked after those Pkl paths at each level. The first existing file wins. Inspect a local override's amends chain before editing the shared project file.
Preserve the existing Pkl package version and hook structure unless the task includes upgrading them. hk config sources prints the precedence of configuration layers; it does not identify the selected project file. hk config dump shows merged settings.
For a new setup, hk init generates a configuration with package imports matching the installed hk. Do not use --force to replace an existing configuration. Installing Git hooks is separate from defining checks; use hk install when hook installation is part of the task.
Add a check
Prefer the built-in definition when it fits: hk builtins lists available names. Builtins configure commands and file selection; the linter executable still needs to be available through the project's existing tool setup.
Extend the project's existing mapping rather than replacing its hooks. For example, with its existing Builtins.pkl import, add this entry to the linter mapping used by the relevant hooks:
["prettier"] = (Builtins.prettier) {
glob = List("**/*.js", "**/*.ts", "**/*.json")
}
Keep the Config.pkl and Builtins.pkl imports on the same package version. Do not copy a newer builtin's fields into a project pinned to an older schema without checking compatibility.
For a custom step, set glob to the intended files, check to the reporting command, and fix only when the tool supports correction. {{files}} passes the selected paths. In monorepos, inspect existing dir and workspace_indicator choices before adding a repository-wide command. Use depends for real ordering dependencies; independent steps can run concurrently.
Verify the configuration and file selection
Run hk validate, then preview the relevant hook without executing its commands:
hk check --all --why prettier
Replace prettier with the added step and choose explicit files instead of --all when the task is narrower. If the step only exists in pre-commit, inspect it with hk run pre-commit --plan --why prettier instead; do not assume the check hook has identical steps.
After reviewing the selected commands and confirming their effects fit the task, run the targeted check:
hk check --check --step prettier --all
--check selects check commands even if the hook sets fix = true; it does not make arbitrary commands read-only. Custom check commands can write files. Use hk fix when corrections are intended and inspect the resulting diff; pre-commit fixers may also stage changes.
For less common fields, consult the configuration reference, using the project's pinned schema and installed CLI help to resolve version differences.