@openai/agents-core/dist/sandbox/shared/output.mjs

The OpenAI Agents SDK is a lightweight yet powerful framework for building multi-agent workflows.

import { randomUUID } from '@openai/agents-core/_shims';
const APPROX_BYTES_PER_TOKEN = 4;
export function truncateOutput(output, maxOutputTokens) {
    if (maxOutputTokens == null) {
        return { text: output };
    }
    const maxBytes = Math.max(0, maxOutputTokens) * APPROX_BYTES_PER_TOKEN;
    const outputBytes = byteLength(output);
    if (outputBytes <= maxBytes) {
        return { text: output };
    }
    const originalTokenCount = approximateTokenCountFromBytes(outputBytes);
    const totalLines = countLines(output);
    const fullMarker = formatTruncationMarker(originalTokenCount);
    let lineCountPrefix = `Total output lines: ${totalLines}\n\n`;
    let preservedNotice = getPreservedLeadingNotice(output);
    const body = preservedNotice ? output.slice(preservedNotice.length) : output;
    if (byteLength(preservedNotice) > maxBytes) {
        preservedNotice = '';
    }
    if (byteLength(lineCountPrefix) +
        byteLength(preservedNotice) +
        byteLength(fullMarker) >
        maxBytes) {
        lineCountPrefix = '';
    }
    const prefixBytes = byteLength(lineCountPrefix) + byteLength(preservedNotice);
    if (prefixBytes + byteLength(fullMarker) > maxBytes) {
        return {
            text: `${lineCountPrefix}${preservedNotice}${truncateUtf8(fullMarker, maxBytes - prefixBytes)}`,
            originalTokenCount,
        };
    }
    const bodyBudget = maxBytes - prefixBytes - byteLength(fullMarker);
    const truncatedBody = truncateWithByteBudget(body, bodyBudget);
    const retainedBytes = byteLength(preservedNotice) + truncatedBody.retainedBytes;
    const marker = formatTruncationMarker(approximateTokenCountFromBytes(outputBytes - retainedBytes));
    return {
        text: `${lineCountPrefix}${preservedNotice}${truncatedBody.prefix}${marker}${truncatedBody.suffix}`,
        originalTokenCount,
    };
}
export function formatExecResponse(args) {
    const lines = [
        `Chunk ID: ${randomUUID().replace(/-/g, '').slice(0, 6)}`,
        `Wall time: ${args.wallTimeSeconds.toFixed(4)} seconds`,
    ];
    if (typeof args.sessionId === 'number') {
        lines.push(`Process running with session ID ${args.sessionId}`);
    }
    else if (typeof args.exitCode === 'number') {
        lines.push(`Process exited with code ${args.exitCode}`);
    }
    if (typeof args.originalTokenCount === 'number') {
        lines.push(`Original token count: ${args.originalTokenCount}`);
    }
    lines.push('Output:');
    lines.push(args.output);
    return lines.join('\n');
}
export function elapsedSeconds(start) {
    return (Date.now() - start) / 1000;
}
function truncateWithByteBudget(output, maxBytes) {
    const leftBudget = Math.floor(maxBytes / 2);
    const rightBudget = maxBytes - leftBudget;
    const totalBytes = byteLength(output);
    const tailStartTarget = Math.max(0, totalBytes - rightBudget);
    let prefixEnd = 0;
    let suffixStart = totalBytes;
    let suffixStarted = false;
    let byteIndex = 0;
    for (const character of output) {
        const characterBytes = byteLength(character);
        const characterEnd = byteIndex + characterBytes;
        if (characterEnd <= leftBudget) {
            prefixEnd = characterEnd;
            byteIndex = characterEnd;
            continue;
        }
        if (byteIndex >= tailStartTarget) {
            if (!suffixStarted) {
                suffixStart = byteIndex;
                suffixStarted = true;
            }
            byteIndex = characterEnd;
            continue;
        }
        byteIndex = characterEnd;
    }
    if (suffixStart < prefixEnd) {
        suffixStart = prefixEnd;
    }
    const bytes = new TextEncoder().encode(output);
    const prefix = new TextDecoder().decode(bytes.slice(0, prefixEnd));
    const suffix = new TextDecoder().decode(bytes.slice(suffixStart));
    return {
        prefix,
        suffix,
        retainedBytes: prefixEnd + totalBytes - suffixStart,
    };
}
function formatTruncationMarker(tokens) {
    return `...${tokens} tokens truncated...`;
}
function truncateUtf8(output, maxBytes) {
    let byteIndex = 0;
    let stringIndex = 0;
    for (const character of output) {
        const characterBytes = byteLength(character);
        if (byteIndex + characterBytes > maxBytes) {
            break;
        }
        byteIndex += characterBytes;
        stringIndex += character.length;
    }
    return output.slice(0, stringIndex);
}
function getPreservedLeadingNotice(output) {
    const match = output.match(/^\[\.\.\.\d+ characters truncated from process output\.\.\.\]\n/u);
    return match?.[0] ?? '';
}
function countLines(output) {
    if (output.length === 0) {
        return 0;
    }
    return output.split(/\r\n|\r|\n/).length;
}
function byteLength(output) {
    return new TextEncoder().encode(output).byteLength;
}
function approximateTokenCountFromBytes(bytes) {
    if (bytes <= 0) {
        return 0;
    }
    return Math.ceil(bytes / APPROX_BYTES_PER_TOKEN);
}
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