# Reference

Lookup pages: the command surface, exit codes and gates, the skill catalogue, the page types. A
reference page describes what is, not how to use it or why it is so - and wherever a source for
it exists in the code, it is generated from that source and checked against it rather than
written by hand.

- [Command reference](commands/README.md) - every `wikitool` command, one page per group,
  generated from the same records as `tools/wikitool <command> -h`.
- [Exit codes and gates](exit-codes.md) - which commands can stop and wait for a person, and
  why.
- [Skill catalogue](skills.md) - the skills the stack ships, what each does and which requests
  start it, generated from their `SKILL.md`.
- [Page types](page-types.md) - every page type the stack ships for `kb/`, its subtypes, where
  its pages are written and its required fields, generated from the type-specs.
- [Configuration](configuration.md) - the environment variables `wikitool` reads and the
  per-checkout files an operator may create. Written by hand: it has no source to be generated
  from yet.

The last two describe the stack's shipped defaults, which an instance may change or extend;
`tools/wikitool instructions list` and `tools/wikitool types describe <type>` show what one
instance has.