ThumbnailMaker MCP

An official MCP server operated by ThumbnailMaker that enables AI agents to generate, check, and edit YouTube thumbnails. It supports writing briefs from video links, generating 1280x720 or 1080x1920 images with text, correcting existing thumbnails, and creating A/B test variants. The server handles pricing transparency and credit usage.

Endpoint and access

OAuth sign-in: the first time you connect, your client opens the vendor's own authorization prompt in a browser.

Vendor evidenceStreamable HTTPOAuth sign-inEndpoint checked 2026-11-01Operated by ThumbnailMaker

You need:OAuth sign-in or a Studio key as a bearer tokenMaking thumbnails needs the Studio planno account

MCP endpoint (Streamable HTTP)

https://www.thumbnailmaker.so/api/mcp

Vendor documentation

What you can do with it

Generate a YouTube thumbnail from a video link
Check thumbnail readability and text accuracy
Create three thumbnail variants for A/B testing
Correct text size or lighting on an existing thumbnail

Source and maintenance

Vendor evidenceRegistry 1.1.0

mcp-registry: so.thumbnailmaker/thumbnailmaker@1.1.0 Project website

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks: 1 of 1 (100%)
Average latency: 320 ms
95th percentile latency: 320 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

Nov 1, 2026, 9:19 AM UTC · probe · passed · 320 ms · metadata changed · refuses unauthenticated initialize (HTTP 401)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http thumbnailmaker-mcp https://www.thumbnailmaker.so/api/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add thumbnailmaker-mcp --url https://www.thumbnailmaker.so/api/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable thumbnailmaker-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "thumbnailmaker-mcp": {
      "url": "https://www.thumbnailmaker.so/api/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).

Cline configuration

{
  "mcpServers": {
    "thumbnailmaker-mcp": {
      "type": "streamableHttp",
      "url": "https://www.thumbnailmaker.so/api/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start thumbnailmaker-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "thumbnailmaker-mcp": {
      "type": "http",
      "url": "https://www.thumbnailmaker.so/api/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http thumbnailmaker-mcp https://www.thumbnailmaker.so/api/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

{
  "mcpServers": {
    "thumbnailmaker-mcp": {
      "url": "https://www.thumbnailmaker.so/api/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "thumbnailmaker-mcp": {
      "serverUrl": "https://www.thumbnailmaker.so/api/mcp"
    }
  }
}

Let your agent find its tools

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