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Engineering

Sub2API Billing Vulnerability and Fix Verification

Learn how ErrAPIKeyNotFound can roll back Sub2API billing, verify the fix in v0.2.17, and audit missed charges without double billing.

2026-10-22 10

LLM API Editorial Team

Engineering

429 Retry-After: Stopping a Rate-Limit Retry Storm

A Mythos V3 engineering case study on adding correct 429 Retry-After headers, separating quota gates, and reducing five-minute application 429s from 1,050 to 7.

2026-08-21 8

Yazhou Hu

Engineering

Node.js Event Loop Blocking: Fixing an O(n²) Prefix-Hash Hot Path

A Mythos V3 engineering note on diagnosing Node.js event loop blocking, replacing quadratic prefix hashing with one linear pass, and proving byte-for-byte equivalence.

2026-08-21 9

Yazhou Hu

Engineering

Why Claude Code Sessions Break Past 400K Tokens — And the Self-Audit Pattern That Fixes It

Long Claude Code conversations degrade past ~400K tokens: fabricated paths, skipped TODOs, contradicted decisions. The naive fix (open a new window) fails because self-summaries lie. Here is the self-audit pattern that catches the lying — and the open-source skill that automates it.

2026-04-24 9

Yazhou Hu