# Callback (mutate_step_readers)
Add user(s) to step readers or set (override) step reader(s) using processing variables
# Config
mutate_step_readers:
config:
# Required | Type: array | Default: []
# Steps for which are readers mutated
steps: ["mystep"]
# Required | Type: array | Default: []
# List of user IDs
users: ["{$_process->roles["@creator"][0]->id}"]
# Optional | Type: string | Default: override
# Whether users should be added or override actual readers
#
### Examples
### - add
### - override
mode: "override"
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