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mcp/harbor
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postalref MCP

v0.2.1 changelog · 3

com.postalref/postalref

USPS package barcodes, service type codes and mailing terms, each cited to its USPS source.

transport:streamable-http tools:8
Website

Target client

run in your project directory 

claude mcp add --transport http postalref https://postalref.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

decode

decode

lookup Read-only

lookup

diff

diff

search Read-only

search

define

define

read_source Read-only

read source

search_documents Read-only

search documents

search_text Read-only

search text

All 8 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.