OpenCode MCP Integration

Capture a webpage or turn HTML/CSS into a PNG, WebP, or PDF with HTML/CSS to Image.

You’ll need: an HCTI account with image credits. Sign in through your browser when connecting—no API key to copy.

1. Add the remote MCP server to OpenCode

Merge this entry into your project’s opencode.json:

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "hcti": {
      "type": "remote",
      "url": "https://mcp.hcti.io",
      "enabled": true
    }
  }
}

Authenticate and check the server from that project directory:

opencode mcp auth hcti
opencode mcp list

Complete authorization in your browser, then open OpenCode and ask “Use HCTI to check my image usage and account limits”. OpenCode also prompts for OAuth when a remote server needs authentication on first use. See OpenCode’s MCP documentation.

2. Take a screenshot

Send this prompt after connecting:

Use HTML/CSS to Image to screenshot https://example.com as a PNG.
Set viewport_width to 1440 and device_scale to 1. Return the image URL.

Open the returned image URL to view your screenshot. Replace https://example.com with your own public URL.

3. Render HTML/CSS

Try a small card with explicit text, colors, and dimensions:

Use HCTI to render this HTML and CSS as a PNG at device_scale 1.
HTML: <div class="card">Hello from HCTI</div>
CSS: .card { width: 1200px; height: 630px; display: flex;
align-items: center; justify-content: center; background: #172554;
color: white; font: 64px sans-serif; }
Return the hosted image URL.

The result is a dark blue card with centered white text. Edit the text or CSS and render again to refine it.

How to reuse a saved template

After connecting HCTI, ask OpenCode:

Use HCTI to list my templates. Find the social-card template, check its variables, and render it with the headline "Shipping today". Return the image URL.

Replace social-card with a template in your account. If you do not have one yet, ask OpenCode to save the HTML/CSS card from the previous step as a reusable template.

Available tools

HTML/CSS to Image (HCTI) exposes the same MCP tools in every supported client. Ask your assistant to use HCTI by name when you want it to render HTML/CSS or capture a website.

Account usage

Tool	What it does
check_usage	Check images used, the account’s image allowance, the next reset date, and whether overages are enabled. Does not render an image.

Screenshots and rendering

Tool	What it does
create_image	Render HTML and CSS as PNG, JPG, WebP, or PDF. Accepts rendering options such as `device_scale`, `viewport_width`, `viewport_height`, and `ms_delay`.
create_url_image	Capture a public webpage or a specific element using a CSS selector. Supports viewport settings and cookie banner blocking.
create_templated_image	Render a saved template using its `template_id` and a `template_values` object.
create_batch_images	Render multiple variations in one request, with shared `default_options` and per-image `variations`.
get_max_batch_size	Check the authorized account’s current batch limit before preparing a batch.

Template management

Tool	What it does
create_template	Save HTML and CSS as a reusable template with variables.
update_template	Update an existing template by ID.
list_templates	Find templates in the connected HCTI account.
list_template_versions	Inspect the version history of a template.

See the rendering parameters for available options and the Template Editor guide for designing reusable templates.

Troubleshooting

Missing tools or connection errors

Run opencode mcp list from the project directory and confirm hcti is enabled. Use opencode mcp auth hcti to authenticate. Check that your agent configuration has not disabled HCTI tools.

Rendering errors

HCTI fetches webpages from its hosted service. Use a publicly accessible URL; it cannot reach your computer’s localhost. For HTML/CSS rendering, supply the file contents and accessible assets rather than local file paths. Check your HCTI dashboard for available image credits.

See shared MCP troubleshooting for authentication and rendering errors, or choose another client.

Need help?

Talk to a human. Please email us support@htmlcsstoimage.com with any questions and we’ll gladly help you get started.