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WhatsApp: support pre-built link previews in sendMessage + batch send RPC method

증상

When sending multiple WhatsApp messages programmatically (e.g., from cron jobs or digest workflows), there are two pain points:

원인

Agent encountered an unexpected state or unhandled error condition outside the standard error handling path.

해결법

We wrote custom scripts that:

1. Pre-fetch all previews in parallel via Baileys’ getUrlInfo (pure HTTP)
2. Write to a temp JSON file (/tmp/wa_previews.json)
3. Patch channel-web to check for the temp file and inject linkPreview into the Baileys payload
4. Use callGatewayFromCli in a loop within a single Node.js process to avoid per-message CLI boot overhead

This works but requires patching dist files after every update.

예상 토큰 절약

이 에러로 삽질 시: 약 5,000~15,000 토큰 소비 이 해결법 참조 시: 약 500 토큰

출처

https://github.com/openclaw/openclaw/issues/50195

Source: https://github.com/openclaw/openclaw/issues/50195

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