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Fix exponential backoff for provider: {anthropic,openai}#12421

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Fix exponential backoff for provider: {anthropic,openai}#12421
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@leegarrett leegarrett commented May 15, 2026

Exponential backoff was broken for anthropic. The reason is that ParseError() returned a plain Error with no .response property. withExponentialBackoff() only triggers the backoff logic when when error.response?.status == 429. Without that property, it immediately rethrows the error. With this fix, it correctly backs off on an HTTP 429 error.

provider: openai bypasses BaseLLM.fetch() and uses the openai SDK.

Fix the tests so that they pass again.

Some APIs have a per minute rate-limt, so increase the max retries in both codepaths to 8 so that it it retries up to 127.5s until it fails.

I have built the extension and verified both codepaths now work with the rate-limited API in question.

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@leegarrett leegarrett requested a review from a team as a code owner May 15, 2026 22:40
@leegarrett leegarrett requested review from sestinj and removed request for a team May 15, 2026 22:40
@dosubot dosubot Bot added the size:XS This PR changes 0-9 lines, ignoring generated files. label May 15, 2026
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No issues found across 3 files

Re-trigger cubic

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I have read the CLA Document and I hereby sign the CLA.

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recheck

Exponential backoff was broken for anthropic. The reason is that ParseError()
returned a plain Error with no .response property. withExponentialBackoff() only
triggers the backoff logic when when error.response?.status == 429. Without that
property, it immediately rethrows the error. With this fix, it correctly backs
off on an HTTP 429 error.

`provider: openai` bypasses BaseLLM.fetch() and uses the openai SDK.

Fix the tests so that they pass again.

Some APIs have a per minute rate-limt, so increase the max retries in both
codepaths to 8 so that it it retries up to 127.5s until it fails.
@leegarrett
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recheck

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Hi @sestinj, if you find the time, can you review this PR? It fixes exponential backoff and also enables the tests again.

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