Function record_tool_output_replace 

pub fn record_tool_output_replace(
    plugin_id: impl Into<String>,
    hook: impl Into<String>,
    tool_name: Option<String>,
    observed_len: usize,
    replacement_len: usize,
) -> Result<(), String>

Record that an extension replaced a tool’s output. Best-effort and metadata-only — auditing must never break or alter the tool flow, so callers typically ignore the result.