@adonis-agora/agent/dist/src/turn-timing.js

Governed, durable-backed AI agent (chat + tool-calling + governance) for AdonisJS — part of the Agora ecosystem.

/**
 * Wraps the turn's stream writer to note when the first `text` frame goes out: the time to first
 * token as the reader sees it (a frame an output gate held back counts when it was released). The
 * clock is this process's, so a run resumed elsewhere measures from its resume.
 */
export function observeFirstText(writer, now = Date.now) {
    let firstTextAt;
    const wrapped = Object.create(writer);
    wrapped.write = (frame) => {
        if (firstTextAt === undefined && frame.t === 'text' && frame.v.length > 0)
            firstTextAt = now();
        return writer.write(frame);
    };
    wrapped.end = () => writer.end();
    if (typeof writer.flush === 'function') {
        wrapped.flush = () => writer.flush.call(writer);
    }
    return { writer: wrapped, firstTextAt: () => firstTextAt };
}
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