Ucp validate

Skill ViryaZheng/ucp-onboard/skills/ucp-validate

Performs profile-oriented validation for a deployed UCP integration. It fetches /.well-known/ucp, checks basic structure, spot-checks spec/schema URLs, and reports official tool availability. Use after profile deployment or as a lightweight preflight before full UCP schema/conformance testing.From its SKILL.md

Install

npx -y skills add ViryaZheng/ucp-onboard --skill ucp-validate

Assembled from the repository path, not quoted from the project. Check it against their README if it does not work.

3 things to look at

4 stars4 stars. Stars are a popularity signal and not a quality one, but at this level it is likely that nobody has read this closely except its author, and you would be relying on your own review.
runs commandsInstructs the agent to run 1 command, including `python ${CLAUDE_SKILL_DIR}/scripts/validate_ucp.py https://example.com --output store/clients/example/validation-report.md`.
fetches URLsInstructs the agent to fetch 1 URL, including https://example.com.

SKILL.md

1.8 KB, 343 tokens by cl100k_base, as published. Nobody here has run it

UCP Validate

Run a lightweight validation pass against a deployed UCP profile.

Run

python ${CLAUDE_SKILL_DIR}/scripts/validate_ucp.py \
  https://example.com \
  --output store/clients/example/validation-report.md

What This Script Checks

/.well-known/ucp or /.well-known/ucp.json exists
JSON parses and has a top-level ucp object
ucp.version uses YYYY-MM-DD
ucp.services, ucp.capabilities, and ucp.payment_handlers exist
service entries include required basics such as version and endpoint for network transports
payment handler entries include id and version
up to five capability spec/schema URLs are reachable
offline validation against the vendored official UCP profile schema (refs/ucp-schema/2026-04-08/), when jsonschema is installed
local availability of official ucp-schema and conformance tooling

What It Does Not Yet Check

Catalog search/lookup behavior
Checkout create/update/retrieve/cancel lifecycle
Payment handler runtime behavior
Real conformance-suite execution

Use official UCP tools for those deeper checks.

Output

Writes:

validation-report.md
validation.json when --json-output is provided

The validator returns PASS, CONDITIONAL PASS, or FAIL based on critical and error-level checks.

Hard Rule

Never call checkout completion or trigger real payment capture during validation.

What ships with it: 2 files

23.5 KB alongside SKILL.md, 1 of them executable

references/

check-matrix.md677 B

scripts/

validate_ucp.pyruns22.8 KB