UCP Printing Press CLI
EcosystemAgent-native Go CLI for checking UCP merchant manifests and interacting with merchants over REST or MCP.
This is an open-source developer tool for building UCP integrations. View on GitHub →
UCP Printing Press CLI is a focused Go command-line tool from the Printing Press Library. It can fetch and grade /.well-known/ucp profiles, inspect advertised transports and capabilities, search across UCP merchants in parallel, and run a bundled mock UCP merchant for local development without requiring a separate runtime.
Why This Matters for UCP
UCP Printing Press CLI gives agents and developers a terminal-native way to validate merchant profiles, exercise REST and MCP flows, and bootstrap local UCP merchant testing.
UCP Capabilities
UCP Endpoint
Ecosystem — Endpoint not yet publicly available
Integration Example
npx -y @mvanhorn/printing-press-library install ucp
# Inspect a merchant discovery profile
ucp-pp-cli check https://merchant.example
# Start a local mock merchant for development
ucp-pp-cli mock serveCategory
Developer ToolsUCP Status
EcosystemTags
Pricing
free
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Reviews
★★★★★4.6 (5 reviews)These are illustrative examples to show what reviews will look like. Submit your own experience below.
E. Garcia
Senior Engineer · Jan 30, 2026
Solid tool. The test suite coverage is excellent. I found one edge case in the payment token validation that the maintainers fixed within 48 hours.
M. Fischer
DevTools Engineer · Mar 8, 2026
Integrated in an afternoon. The discovery endpoint just worked. The CLI flags are well-designed — composable, no magic defaults.
Y. Okonkwo
API Engineer · Feb 25, 2026
Good tool for UCP conformance testing. Runs fast and the output is easy to parse in CI. Would like a JSON output mode — currently only text.
B. Thompson
Staff Engineer · Mar 5, 2026
This saved us days of work. Dropped it into our pipeline and had UCP endpoint validation running in about 20 minutes. Documentation is accurate.
K. Park
Backend Developer · Feb 18, 2026
The best developer tool in this category. TypeScript types are correct and complete. Error messages actually tell you what went wrong.
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