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mcp/harbor
Verified official

Receipt — sign an agent's work, verify it offline MCP

v1.1.0 changelog · 1

io.github.ecstatica/ggbank-receipt

Ed25519 receipts over work artifacts: issue and verify offline, no account, no chain, no network.

transport:streamable-http runtime:mcpb tools:2
View source

Target client

run in your project directory 

claude mcp add --transport http ggbank-receipt https://receipt.whirlwindcorp.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

issue_receipt

issue receipt

verify_receipt

verify receipt

All 2 tools, one page each

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.