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mcp/harbor
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PaperAgent — Send Physical Mail MCP

v0.1.0

dev.paperagent/letters

Mail one-off USPS letters from ChatGPT or Claude after you approve the preview and price. US only.

transport:streamable-http tools:8
Website

Target client

run in your project directory 

claude mcp add --transport http letters https://paperagent.dev/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

get_pricing Read-only

get pricing

validate_address

validate address

create_draft Mutating

create draft

update_draft Mutating

update draft

preview_draft

preview draft

send_letter Mutating

send letter

get_letter_status Read-only

get letter status

list_letters Read-only

list letters

All 8 tools, one page each

4 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.