Request modifiers

Modifiers intercept tool calls to transform inputs or outputs, useful for validation, enrichment, or logging.

# actions comes from the Scalekit client (or your framework adapter)
actions = scalekit_client.actions

@actions.pre_modifier(tool_names=["gmail_fetch_emails"])
def add_default_label(tool_input):
    tool_input.setdefault("label", "UNREAD")
    return tool_input

@actions.post_modifier(tool_names=["gmail_fetch_emails"])
def filter_attachments(tool_output):
    tool_output["emails"] = [e for e in tool_output["emails"] if not e.get("has_attachment")]
    return tool_output

Decorator	Receives	Returns
@actions.pre_modifier(tool_names)	dict	Modified dict
@actions.post_modifier(tool_names)	dict	Modified dict

tool_names accepts a string or a list of strings. Multiple modifiers for the same tool chain in registration order.

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