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mcp/harbor
Verified official

Postcard MCP

v1.0.0

com.clawhard/postcard

Check a link's share card on X, Facebook, LinkedIn: real image size, tag problems, fixed tags.

transport:streamable-http tools:2
Website

Target client

run in your project directory 

claude mcp add --transport http postcard https://postcard.clawhard.com/mcp

setup guides: Claude Code Claude Desktop Cursor VS Code Zed Windsurf Cline Gemini CLI Grok ChatGPT Claude.ai LangChain

Adds it for this project only. Append --scope user to make it available everywhere. Claude Code docs

postcard_check_link_preview

postcard check link preview

postcard_check_preview_tags

postcard check preview tags

All 2 tools, one page each

1 prompt you invoke yourself

2 resources you attach as context

Mutating and Read-only are read off each tool's name, not its schema — a hint, not a guarantee. Check the server's own documentation before granting access.