Celebrate HubSpot closed-won deals in Slack with the customer's logo

Build me an agent workflow that celebrates every closed-won deal in Slack with the customer's actual logo embedded, so our sales team gets a real visual moment instead of a flat 'deal won' line.

Trigger: a HubSpot webhook on deal property change, filtered so the agent only fires when the deal's stage changes to closed-won. If the stage value isn't a closed-won stage, exit early without posting.

When it fires, the agent should do the following:

1. Call HubSpot Get Deal on the deal that just moved, pulling at minimum the deal name, amount, deal owner, close date, and the associated company id.

2. Call HubSpot Get Company on the associated company to pull the company name and domain (website).

3. Use Image Search (search-images) to find the company's official logo. Query with the company name plus the domain (for example, 'Acme Corp acme.com logo'). Score results so the agent prefers clean, roughly square logo images, and apply a domain-match heuristic: results whose source URL or description references the company's own domain rank highest. Pick the single best candidate. If no candidate clears a reasonable confidence bar, fall back to a brand product image search ('Acme Corp product') and apply the same heuristic. If that still doesn't return anything good, skip the image entirely rather than posting a wrong one.

4. Compose a short, upbeat hype message including: the customer (company) name, the ARR (deal amount, formatted with currency), the account exec (deal owner), the deal name, and one short line about the company if the domain gives an obvious hint. Keep it 2 to 4 lines. Do not use em dashes anywhere in the copy; use periods or commas. Use Slack-flavored markdown for bold and links.

5. Use Slack Bot Send a Message to post in a configurable wins channel (default to #sales-wins, but expose the channel as a workflow setting). Attach the logo URL so Slack unfurls the image into the message. If the agent skipped the image, just send the message without an attachment.

Edge cases to bake in: if the deal amount is missing or zero, skip posting politely and log why instead of celebrating a blank number. If the deal has no associated company, post a name-only celebration without a logo. If the HubSpot webhook fires for a stage that isn't closed-won, exit immediately.

Use the Slack Bot integration (not the user-token Slack integration) so the post comes from a shared bot identity that keeps working when individual sellers leave.