add_screenshot

com.cobaltcapture/cobalt · Verify this server

Append a screenshot (with an optional note) to a review created by create_review. The image is stored durably in Cobalt — this is the way to persist screenshots that would otherwise be lost when they only pass through a browser tool. Call once per screen as you go. NO BROWSER? Pass `page_url` and Cobalt renders the page for you (Cloudflare headless Chrome): `viewport` 'desktop' (1280px) or 'mobile' (390px phone, 2x), `full_page` true for the whole scroll. Use it for every screen you would otherwise only describe in text — a review without screenshots is a reduced deliverable, and the mobile viewport is how you test the phone fold without a device. The result includes the rendered image: LOOK AT IT before moving on. Cookie walls and modal veils are stripped automatically, but if what came back is still not the shot (an overlay, a blank, the wrong page), retake it in place with `replace_item` = that item's number, adding `hide_selectors` for anything you can name — never leave a useless capture in the review and never append a second copy after it. Otherwise the input is `image_url`: POST the image to https://cobaltcapture.com/api/upload (multipart field `file`, no auth, returns {url, key}) and pass back the url. If a browser-automation script took the screenshot, do that POST inside the same script (Python `requests.post(...)`, or Playwright's request context) rather than shelling out to curl afterwards — same result, one less permission prompt. The `image` base64 parameter exists for small images only: tool-call arguments are model-generated text, so a real screenshot means emitting tens of thousands of base64 tokens perfectly, and an image you received as an image cannot be transcribed at all.