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USPS package barcodes, service type codes and mailing terms, each cited to its USPS source.
Remote server: your requests and data go to postalref.com. Claude Code: claude mcp add --transport http postalref https://postalref.com/mcp · Claude app: Settings → Connectors → Add custom connector.
The tools this server listed when we connected to it, in its own words.
decode — Read a package barcode or tracking number (IMpb), or a letter's or flat's Intelligent Mail barcode (IMb) from its digits or bars: its layoutlookup — Look up a USPS code: its row as USPS prints it in the newest edition that lists it, the codes its cells name, the editions that list it and diff — What changed in a code table or document between two editions: each code added, removed or changed and each changed section, rated editorialsearch — Search the codes, terms, banner texts, specs and documents postalref models, by one index: names and codes whose key is the query's first, tdefine — What USPS means by a name or abbreviation: each registry entry it names, in the order search ranks them, with its kind and tier, the USPS woread_source — Read any document postalref holds page by page, as extracted, to quote it: a quote cites the revision's sha256, the PDF page and the words esearch_documents — Search every document on PostalPro by title and file name, with its page and newest file, and the product pages and downloads postalref holdsearch_text — Search the text of every document postalref holds, or of one, for the pages that say the words, best first: those that say them as a phrase,Not tested by KitScout yet. When our harness runs it, pros, cons and the tasks we tried appear here, with the date and evidence.