Fable Config

Change harness/configuration behavior with explicit precedence, least privilege, secret-safe handling, and a verified rollback path.

Mission

Configuration is executable behavior. A syntactically valid JSON/TOML/YAML file can still disable a guard, broaden permissions, write to the wrong scope, or be ignored because another source has higher precedence.

The Skill must prove both configuration validity and effective behavior.

Activate When

• changing host/harness settings, permissions, hooks, keybindings, model/tool config, or environment references;
• adding/removing lifecycle enforcement;
• troubleshooting why a setting is not taking effect;
• configuring safe command/tool allowlists;
• migrating configuration formats/scopes.