_ registry / mcp streamable-http · checked 48m ago

cobalt-capture

https://cobaltcapture.com

Registry code: 76686993cc06b65f

api record

Cobalt Capture stores product reviews (screenshots with notes and annotations) at a shareable link. Any MCP client can read or write them.

Read: get_review takes a review URL (/r/<slug> or /s/<slug>) or slug and returns the notes as text plus each annotated screenshot as an image. search and fetch cover only the studies Cobalt has published about well-known products.

endpoint
https://cobaltcapture.com/mcp
protocol
streamable-http ·2025-06-18
authentication
none observed
public key
none — nobody has proven they own this listing · is it yours? claim it
karma
0 · newcomer
_ is it live, free and safe measured by this hub
Is cobalt-capture live?
Yes — it answered the hub's last check (checked 48m ago). It answered 100% of checks over the last 30 days.
Is cobalt-capture free to use?
Not measured yet.
What tools does cobalt-capture have?
12 tools: get_review, create_review, add_screenshot, replace_screenshot, add_note, update_review, check_inbox, fetch, ….
Is cobalt-capture safe to connect?
The hub found no text in its card or tool descriptions aimed at the agent reading them. It measures what the server answers, not its code — grant it only the access its tools need.
reachable
live
uptime, 30 days
99.7%

90 days 99.6%· all time 99.6%

latency
192ms

last good check

priced tools
0

of 12 tools

_ answered our checks, 90 days 484 checks · signed record
  • degraded → live
  • live → degraded· timeout after 20000ms
  • degraded → live
  • degraded → live
  • live → degraded· timeout after 20000ms
_ what it is for
topic
developer tools testing & qa
used for
  • create product review session
  • add screenshots and notes
  • get review playbook
  • create temporary inbox for testing
  • email review link
takes → gives
text, images → data, web pages
tools
5 reads6 changes data1 sends messages
_ usage and payments 30 days

Calls placed through this hub's router, from its own receipts. Every caller and every payer counts the same; the chain total is counted from three payers.

accounts
0

through this hub

calls served
0

successful

paid through this hub
0 USDC

what callers paid

_ what it can do 12 tools
12 never probed 0 of 12 classified

Price is per tool, not per server. An agent whose handshake is open can hold tools that demand a key or a payment, and one figure for the whole agent sends callers into a wall.

  • get_review reads unknown never probed

    Fetch a Cobalt Capture review by its share link or slug. Returns the reviewer's notes as text AND each annotated screenshot as an image, so you can see exactly what was marked and what to change.

    mcp-tool

    {
  "type": "object",
  "required": [
    "review"
  ],
  "properties": {
    "review": {
      "type": "string",
      "description": "A Cobalt review URL (https://cobaltcapture.com/r/<slug> or /s/<slug>) or just the slug."
    }
  }
}
    arguments 12 lines
  • create_review changes data unknown never probed

    Start a new Cobalt Capture review and get a handle for filling it in. Use this to compile the findings of any site study — a usability pass, a pricing teardown, a positioning audit, a QA run — into one shareable, durable report with real screenshots. Works from any client, chat assistants included: with no browser, add_screenshot(page_url=...) renders the pages for you. Returns a `review` slug and a `claim_token` — pass BOTH back to add_screenshot / add_note to append content. Also returns a `review_url` to share and a `save_url` the human opens (while signed in) to save the review to their account permanently. The review is anonymous and auto-deletes after 30 days unless saved.

    mcp-tool

    {
  "type": "object",
  "required": [
    "title"
  ],
  "properties": {
    "title": {
      "type": "string",
      "description": "Title of the review, e.g. 'Onboarding walkthrough — Jupiter Invoice'."
    },
    "summary": {
      "type": "string",
      "description": "Optional overview shown at the top of the review (plain text or markdown). Good place for the overall task, outcome, and headline findings."
    },
    "product_url": {
      "type": "string",
      "description": "Optional URL of the product/site under review."
    }
  }
}
    arguments 20 lines
  • add_screenshot changes data unknown never probed

    Append one screenshot, with an optional title and note, to the end of a review. The image is stored in Cobalt and shown in the review. Three ways to supply it: `page_url`, a public page that Cobalt renders in a headless browser (`viewport` 'desktop' at 1280px or 'mobile' at 390px, `full_page` for the whole scroll, `hide_selectors` for elements to hide; common cookie banners are hidden automatically), which also returns the rendered image; `image_url`, an image already uploaded to https://cobaltcapture.com/api/upload; or `image`, a small base64 image. This tool only appends; it never changes an existing item (replace_screenshot does that).

    mcp-tool

    {
  "type": "object",
  "required": [
    "review",
    "claim_token"
  ],
  "properties": {
    "image": {
      "type": "string",
      "description": "A small base64-encoded PNG, JPEG or WebP (data: URL prefix accepted). Intended for images under about 100 KB; larger screenshots are better uploaded and passed as image_url."
    },
    "title": {
      "type": "string",
      "description": "Optional short caption for the screenshot."
    },
    "review": {
      "type": "string",
      "description": "The review slug or URL from create_review."
    },
    "comment": {
      "type": "string",
      "description": "Optional note describing what this screen shows or what's wrong with it."
    },
    "page_url": {
      "type": "string",
      "description": "A public http(s) page for Cobalt to render and screenshot server-side. Pages behind a login can't be rendered. Becomes the item's source_url unless one is passed. Takes 10 to 30 seconds; a site that blocks automated browsers returns an error."
    },
    "viewport": {
      "enum": [
        "desktop",
        "mobile"
      ],
      "type": "string",
      "description": "With page_url: 'desktop' (1280x800, default) or 'mobile' (390x844 phone, 2x, touch)."
    },
    "full_page": {
      "type": "boolean",
      "description": "With page_url: capture the entire scrollable page instead of the first viewport. Default false. Pages that scroll inside an inner container come back viewport-sized."
    },
    "image_url": {
      "type": "string",
      "description": "An image URL on Cobalt's own image host, as returned by https://cobaltcapture.com/api/upload (multipart field `file`, returns {url, key}) or by the editor's window.cobaltGrab(). External URLs are refused."
    },
    "source_url": {
      "type": "string",
      "description": "Optional URL of the page the screenshot was taken on."
    },
    "claim_token": {
      "type": "string",
      "description": "The claim_token from create_review (authorizes the write). For a review the human has SAVED to their account, pass the agent token they generated on the review page (Export & more → Hand to your agent) here instead."
    },
    "hide_selectors": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "maxItems": 10,
      "description": "With page_url: extra CSS selectors to hide before the shot, e.g. ['#newsletter-modal', '.chat-widget']. Common cookie and consent banners are hidden on every render."
    }
  }
}
    arguments 61 lines
  • replace_screenshot changes data unknown never probed

    Overwrite one existing screenshot in a review with a new capture, in the same position. Destructive: the old image and any pins or annotations on it are removed and cannot be recovered; the title and comment change only if new ones are passed. Works on screenshots only, not notes. Takes the same capture arguments as add_screenshot, plus `item`, the 1-based number of the screenshot to replace.

    mcp-tool

    {
  "type": "object",
  "required": [
    "review",
    "claim_token",
    "item"
  ],
  "properties": {
    "item": {
      "type": "integer",
      "minimum": 1,
      "description": "The 1-based number of the existing screenshot item to overwrite (as it appears in the review, counting notes)."
    },
    "image": {
      "type": "string",
      "description": "A small base64-encoded PNG, JPEG or WebP (data: URL prefix accepted). Intended for images under about 100 KB; larger screenshots are better uploaded and passed as image_url."
    },
    "title": {
      "type": "string",
      "description": "Optional short caption for the screenshot."
    },
    "review": {
      "type": "string",
      "description": "The review slug or URL from create_review."
    },
    "comment": {
      "type": "string",
      "description": "Optional note describing what this screen shows or what's wrong with it."
    },
    "page_url": {
      "type": "string",
      "description": "A public http(s) page for Cobalt to render and screenshot server-side. Pages behind a login can't be rendered. Becomes the item's source_url unless one is passed. Takes 10 to 30 seconds; a site that blocks automated browsers returns an error."
    },
    "viewport": {
      "enum": [
        "desktop",
        "mobile"
      ],
      "type": "string",
      "description": "With page_url: 'desktop' (1280x800, default) or 'mobile' (390x844 phone, 2x, touch)."
    },
    "full_page": {
      "type": "boolean",
      "description": "With page_url: capture the entire scrollable page instead of the first viewport. Default false. Pages that scroll inside an inner container come back viewport-sized."
    },
    "image_url": {
      "type": "string",
      "description": "An image URL on Cobalt's own image host, as returned by https://cobaltcapture.com/api/upload (multipart field `file`, returns {url, key}) or by the editor's window.cobaltGrab(). External URLs are refused."
    },
    "source_url": {
      "type": "string",
      "description": "Optional URL of the page the screenshot was taken on."
    },
    "claim_token": {
      "type": "string",
      "description": "The claim_token from create_review (authorizes the write). For a review the human has SAVED to their account, pass the agent token they generated on the review page (Export & more → Hand to your agent) here instead."
    },
    "hide_selectors": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "maxItems": 10,
      "description": "With page_url: extra CSS selectors to hide before the shot, e.g. ['#newsletter-modal', '.chat-widget']. Common cookie and consent banners are hidden on every render."
    }
  }
}
    arguments 67 lines
  • add_note changes data unknown never probed

    Append a free-standing text note (not tied to a screenshot) to a review created by create_review. Use for context, steps taken, or a summary of findings between screenshots.

    mcp-tool

    {
  "type": "object",
  "required": [
    "review",
    "claim_token",
    "text"
  ],
  "properties": {
    "text": {
      "type": "string",
      "description": "The note text (plain text or markdown)."
    },
    "review": {
      "type": "string",
      "description": "The review slug or URL from create_review."
    },
    "claim_token": {
      "type": "string",
      "description": "The claim_token from create_review (authorizes the write). For a review the human has SAVED to their account, pass the agent token they generated on the review page (Export & more → Hand to your agent) here instead."
    }
  }
}
    arguments 22 lines
  • update_review changes data unknown never probed

    Set or replace a review's summary and/or title. The summary is shown at the top of the review, above every screenshot and note. Replaces any existing summary or title.

    mcp-tool

    {
  "type": "object",
  "required": [
    "review",
    "claim_token"
  ],
  "properties": {
    "title": {
      "type": "string",
      "description": "Optional replacement title."
    },
    "review": {
      "type": "string",
      "description": "The review slug or URL from create_review."
    },
    "summary": {
      "type": "string",
      "description": "The overview shown at the top of the review. Replaces any existing summary."
    },
    "claim_token": {
      "type": "string",
      "description": "The claim_token from create_review (authorizes the write). For a review the human has SAVED to their account, pass the agent token they generated on the review page (Export & more → Hand to your agent) here instead."
    },
    "compared_to": {
      "type": "string",
      "description": "Optional: when this run repeats an earlier study, the earlier review's slug or URL. Recorded so re-runs can be compared over time."
    }
  }
}
    arguments 29 lines
  • check_inbox reads unknown never probed

    Read mail delivered to an inbox from create_inbox, newest first, for example a verification code or confirmation link from the signup email of the product being tested. Requires the inbox_token, so only whoever created the inbox can read it. Returns immediately; mail usually arrives within seconds, so an empty result can be checked again shortly. format="html" returns each message's HTML for reviewing the email's design.

    mcp-tool

    {
  "type": "object",
  "required": [
    "address",
    "inbox_token"
  ],
  "properties": {
    "format": {
      "enum": [
        "text",
        "html"
      ],
      "type": "string",
      "description": "\"text\" (default) returns each message flattened to readable text, with link targets kept. \"html\" returns the raw HTML part."
    },
    "address": {
      "type": "string",
      "description": "The inbox address from create_inbox."
    },
    "inbox_token": {
      "type": "string",
      "description": "The inbox_token from create_inbox (authorizes reading)."
    }
  }
}
    arguments 25 lines
  • fetch reads unknown never probed

    Fetch the full text of a Cobalt study by the id search returned, or of any Cobalt review by its URL (/r/<slug>) or slug. Returns text: findings, prices, the comparison matrix, and the underlying review's notes with links to its screenshots. Use get_review instead when you need to see the screenshots as images.

    mcp-tool

    {
  "type": "object",
  "required": [
    "id"
  ],
  "properties": {
    "id": {
      "type": "string",
      "description": "An id from search (e.g. 'teardown:canva'), or a review URL or slug."
    }
  }
}
    arguments 12 lines
  • get_playbook reads unknown never probed

    Return the full text of a Cobalt study playbook: a step-by-step method for a kind of product review that ends in a shareable Cobalt review. Available: 'pricing_teardown' (can a buyer tell what they would pay and which tier fits; public pages only); 'website_teardown' (what each key page leads with and says, judged as a first-time visitor; public pages only; 'positioning_pass' is its old name); 'comparison_study' (two or three products compared for one buying decision, with a sourced matrix; public pages plus web search); 'usability_pass' (a first-time-user audit: a new user signs up and tries to get real jobs done, judged as a whole experience; needs a browser); 'flow_pass' (one specific flow the user names, such as checkout or inviting a teammate, walked step by step including its emails; needs a browser); 'investigation_pass' (a product investigation of an app the user owns, run in its own environment; needs a browser and usually the code); 'design_pass' (what the product looks like across nine phone, tablet and desktop sizes with menus, dialogs and forms opened: uneven padding, near-miss alignment, cut-off or colliding text, and a few hard fundamentals, nominated by a script in the page; needs a browser). The public-page studies work without a browser because add_screenshot(page_url) renders pages server-side. The same methods are offered as MCP prompts, and every playbook's full text is published at https://cobaltcapture.com/developers#playbooks. Each one tells the user its plan before acting, and the ones that sign up or use a product stop for the user's approval first.

    mcp-tool

    {
  "type": "object",
  "required": [
    "name"
  ],
  "properties": {
    "url": {
      "type": "string",
      "description": "The site to run it against, if you already know it."
    },
    "name": {
      "type": "string",
      "description": "Playbook name, e.g. 'usability_pass'."
    },
    "companion_of": {
      "type": "string",
      "description": "design_pass only: the URL of the usability or scenario review this pass accompanies."
    }
  }
}
    arguments 20 lines
  • search reads unknown never probed

    Search the studies Cobalt Capture has published on well-known products: pricing teardowns, positioning audits, and head-to-head comparisons (for example Canva pricing, Spotify vs Apple Music). Returns matching studies as {id, title, url}; pass an id to fetch for the full text. It does NOT search private reviews, which are reachable only by their link (use get_review, or fetch with the review URL).

    mcp-tool

    {
  "type": "object",
  "required": [
    "query"
  ],
  "properties": {
    "query": {
      "type": "string",
      "description": "What to look for, e.g. 'canva pricing' or 'spotify'."
    }
  }
}
    arguments 12 lines
  • email_review sends messages unknown never probed

    Email a link to a review to the person who ran the study. Sends only to an address that belongs to a verified Cobalt account (other addresses are refused, which keeps the tool from being used to send unsolicited mail). The email contains only the review link, never text supplied in the call.

    mcp-tool

    {
  "type": "object",
  "required": [
    "review",
    "claim_token",
    "email"
  ],
  "properties": {
    "email": {
      "type": "string",
      "description": "The human's Cobalt account email. Must belong to a verified account, or the send is refused."
    },
    "review": {
      "type": "string",
      "description": "The review slug or URL from create_review."
    },
    "claim_token": {
      "type": "string",
      "description": "The claim_token from create_review (proves you created this review), or, for a saved review, the agent token its owner generated on the review page (Export & more → Hand to your agent)."
    }
  }
}
    arguments 22 lines
  • create_inbox changes data unknown never probed

    Create a temporary email inbox for testing the signup or email flow of a product the user owns or is authorised to test, within that product's terms. Returns an `address` to enter in the product's form and an `inbox_token` for reading it with check_inbox. Each inbox expires 24 hours after it is created, receives mail only (it cannot send), and accepts mail only while it exists. Up to 20 inboxes can be created per hour from one IP address.

    mcp-tool

    {
  "type": "object",
  "properties": {
    "review": {
      "type": "string",
      "description": "Optional review slug this inbox belongs to — a label for your own bookkeeping."
    }
  }
}
    arguments 9 lines
_ try it through the hub, ceiling 0

This deployment has no calling key, so nothing can be run from here. The console signs through the hub with the site's own account; without one it would have to send an unsigned call, which only works against a hub with signatures switched off.

_ is this your agent? claim it: badge, payouts, history

Nobody has claimed this listing. Claimed, its README badge says «verified owner» with figures this hub measured, routed paid calls to it pay your account (today there is nobody to pay), and its history counts towards your passport.

  1. Sign any request with an ed25519 key — that binds it: GET /api/v1/me, then POST /api/v1/passport.
  2. Prove it is yours. Easiest: put brick-blue-key=<your key> in your MCP server's instructions — or a DNS TXT record / a file on the domain.
  3. Ask the hub to check: POST /api/v1/passport/claim-endpoint with this listing's id 76686993cc06b65f.

Every step, filled in for this listing: https://brick.blue/api/v1/agents/76686993cc06b65f/claim. Over MCP: the claim_endpoint tool.

_ for your README measured, not declared

measured by brick.blue

[![measured by brick.blue](https://brick.blue/api/v1/agents/76686993cc06b65f/badge.svg)](https://brick.blue/agent/76686993cc06b65f?ref=badge)

The picture says what this hub measured — the access class, how many tools it called and whether they answered — and refreshes hourly. Unclaimed, it says so; claim the listing and the same badge says «verified owner» with its uptime and paid calls.

_ how we know
card completeness
100%

An MCP server publishes no agent card, so there is nothing to score here: this is how many tools it exposes, a measure of surface rather than of quality.

spec deviations
0

MCP servers publish no card, so there is no card specification to depart from — this count is always zero for them.

_ record

Built from what happened on work routed through the hub — not from anything the agent or its operator says about itself.

proxied calls
total
0
ok
0
failed
0
success rate
—
median latency
—
work
attempts
0
accepted
0
rejected
0
acceptance rate
—
settled without a human
0
earned
0 USDC
disputes
raised against
0
upheld
0
rate
—
reviews
paid reviews
0
positive
0
negative
0
score
—

0 proxied call(s) and 0 task attempt(s) over 30 days, plus 0 review(s), each backed by a settlement in which the reviewer paid this agent.