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Keep a Google Calendar updated from six WhatsApp groups with Claude Cowork

WorkedEvidence: Described by posterPosted Last checked

A daily Claude Cowork task turns six WhatsApp groups into calendar events, merges duplicates and emails Taha Bharucha a digest.

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Every morning, open WhatsApp Web and read only these six groups: [GROUP NAMES], starting where you stopped last time. Turn events and polls into Google Calendar events, merge duplicates of the same event across groups, never overwrite a field I edited by hand, and email me a short digest of what changed and what needs my decision, even if nothing changed.

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ChatGPT Gemini Grok Claude

This prompt has blanks to fill in, like [GROUP NAMES]. We'll copy it instead of filling it in, so you can edit it before you send.

The source used Claude Cowork and Claude in Chrome, which can take actions in a browser or app. These are general chat tools, so results may differ, and a normal chat may only give you a plan.

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Optional stronger version

Our rewrite with extra checks. The poster didn't test it.

Before you start, ask me 1–3 short questions about the details below and wait for my answers. Once I've answered, confirm the plan in one line and run the whole task start to finish.

Goal: My calendar stays in sync with my group chats without me copying events by hand.

Questions to ask me first:
- Which groups should be read, and which never?
- Which calendar should events go to?
- How should duplicates across groups be recognized?

Inputs (fill in or confirm):
- Groups to read: [EXACT NAMES]
- Calendar: [NAME]
- Digest email: [ADDRESS]
- Matching rule: [EVENT TYPE + DATE + TIME + VENUE]

Rules:
- Reading any chat not on the list counts as a failure.
- Never create a second event for the same occasion; merge instead.
- Fields I changed by hand are locked; report conflicts.
- Send the digest every run, even when nothing happened.

Checkpoint: Run once in report-only mode and show me the events you would create.

If you get stuck: If WhatsApp's layout changes or a message is ambiguous, log it and ask in the digest.

Verify before you finish: Every event in the digest links back to the message it came from.

Output: Updated calendar events plus a daily digest of changes and decisions needed.

Done when: My calendar matches my groups each morning and I only handle the flagged items.

AI tools

Claude CoworkClaude in Chrome

Outcome

Taha Firoz Bharucha was in six busy WhatsApp groups (several cricket chats, a tournament group, a volunteering rota, a weekly class and a tennis club), where events arrive as polls, times and venues change, fixtures get cancelled and the same match is posted in several places. A Claude Cowork task now runs every morning: using Claude in Chrome, it opens WhatsApp Web, reads only those six named groups from where it last stopped, turns polls and messages into Google Calendar events, merges duplicates, and never overwrites a field Bharucha edited by hand. It emails a digest of what changed and what needs attention every run, even when nothing happened, so silence means a failed run, and Bharucha can reply 'delete that' or 'move to 6pm' for the next run to act on. A state file, an action log and a lessons file it updates when something breaks keep it reliable. The calendar now follows the groups without Bharucha doing anything, and each morning's email flags the two or three things that need a decision.

Evidence: Described by posterThe person describes what happened in words, without screenshots or video.

Source

Posted
by Taha Firoz Bharucha (The Rundown community)
Last checked
Method:
How we verify

https://app.therundown.ai/community/posts/4c0d444b-15a3-4139-b269-43584f77ca15

Context: Posted to The Rundown community (date from the post's UTC timestamp). The post quotes the key prompt rules; the post's tool list says Claude Code, while the steps describe a Claude Cowork scheduled task using Claude in Chrome.

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