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fix(agents): reduce billing false positives on long text (#25680)

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Land PR #25680 from @lairtonlelis.
Retain explicit status/code/http 402 detection for oversized structured payloads.

Co-authored-by: Ailton <lairton@telnyx.com>
This commit is contained in:
Peter Steinberger
2026-02-25 01:21:37 +00:00
parent 7dfac70185
commit 43f318cd9a
3 changed files with 52 additions and 0 deletions
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17
src/agents/pi-embedded-helpers/errors.ts
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@@ -161,6 +161,8 @@ const CONTEXT_OVERFLOW_ERROR_HEAD_RE =
/^(?:context overflow:|request_too_large\b|request size exceeds\b|request exceeds the maximum size\b|context length exceeded\b|maximum context length\b|prompt is too long\b|exceeds model context window\b)/i;
const BILLING_ERROR_HEAD_RE =
/^(?:error[:\s-]+)?billing(?:\s+error)?(?:[:\s-]+|$)|^(?:error[:\s-]+)?(?:credit balance|insufficient credits?|payment required|http\s*402\b)/i;
const BILLING_ERROR_HARD_402_RE =
/["']?(?:status|code)["']?\s*[:=]\s*402\b|\bhttp\s*402\b|\berror(?:\s+code)?\s*[:=]?\s*402\b|^\s*402\s+payment/i;
const HTTP_STATUS_PREFIX_RE = /^(?:http\s*)?(\d{3})\s+(.+)$/i;
const HTTP_STATUS_CODE_PREFIX_RE = /^(?:http\s*)?(\d{3})(?:\s+([\s\S]+))?$/i;
const HTML_ERROR_PREFIX_RE = /^\s*(?:<!doctype\s+html\b|<html\b)/i;
@@ -703,11 +705,26 @@ export function isTimeoutErrorMessage(raw: string): boolean {
return matchesErrorPatterns(raw, ERROR_PATTERNS.timeout);
}
/**
* Maximum character length for a string to be considered a billing error message.
* Real API billing errors are short, structured messages (typically under 300 chars).
* Longer text is almost certainly assistant content that happens to mention billing keywords.
*/
const BILLING_ERROR_MAX_LENGTH = 512;
export function isBillingErrorMessage(raw: string): boolean {
const value = raw.toLowerCase();
if (!value) {
return false;
}
// Real billing error messages from APIs are short structured payloads.
// Long text (e.g. multi-paragraph assistant responses) that happens to mention
// "billing", "payment", etc. should not be treated as a billing error.
if (raw.length > BILLING_ERROR_MAX_LENGTH) {
// Keep explicit status/code 402 detection for providers that wrap errors in
// larger payloads (for example nested JSON bodies or prefixed metadata).
return BILLING_ERROR_HARD_402_RE.test(value);
}
if (matchesErrorPatterns(value, ERROR_PATTERNS.billing)) {
return true;
}