taskwarrior/doc/misc/script-hooks-2.txt

$ # Q: What is a formatting hook?
$ # A: Lua code that modifies task output at run time.
$
$ cat > hooks.lua

-- Make ID not show up
function id (name, value)
  return "(shhh - it's a secret)", 0, nil
end

-- Decorate the UUID
function uuid (name, value)
  return '<<<' .. value .. '>>>', 0, nil
end

^D

$ # Q: What is a command hook?
$ # A: Lua code that changes the way commands work.
$
$ cat >> hooks.lua

-- Disable tags
function notags ()
  return 1, 'Tags have been disabled'
end

^D

$
$ task config -- hook.format-id ~/demo/hooks.lua:id
$ task config -- hook.format-uuid ~/demo/hooks.lua:uuid
$ task config -- hook.pre-tag ~/demo/hooks.lua:notags
$ task list
$ task add Demonstrate formatting hooks
$ task 1 info
$ task config hooks on
$ task 1 info
$ task 1 +try_to_tag