uv

An extremely fast Python package and project manager

workhorse Rust astral-sh/uv

80% pass rate

4/7 principles met

Spec Coverage

How many of the spec's requirements were verified for this tool. See /coverage for the full matrix.

Level	Total	Verified	Unverified
MUST	23	9	14
SHOULD	16	0	16
MAY	7	0	7

WARN Structured output support Structured, Parseable Output --output/--format flag detected but could not validate JSON via safe probes (--help/--version override output flags in most CLIs)
WARN Pager-using CLI ships --no-pager escape hatch Composable, Predictable Command Structure pager referenced in --help but no --no-pager escape hatch advertised

PASS	Non-interactive by default
SKIP	Non-interactive gate flag advertised in --help	target satisfies P1 via alternative gate (help-on-bare or stdin-primary)
PASS	Flags advertise env-var bindings in --help

WARN

Structured output support

--output/--format flag detected but could not validate JSON via safe probes (--help/--version override output flags in most CLIs)

PASS	Help flag produces useful output
PASS	Version flag works

PASS

Rejects invalid arguments

PASS	Handles SIGPIPE gracefully
WARN	Pager-using CLI ships --no-pager escape hatch	pager referenced in --help but no --no-pager escape hatch advertised
PASS	Respects NO_COLOR

PASS

Quiet mode available

This score (80%) clears the badge floor (80%). Copy this into your README:

[![agent-native](https://anc.dev/badge/uv.svg)](https://anc.dev/score/uv)

Preview:

Reproduce this scorecard for uv locally and inspect the failing checks:

anc check --command uv --output json

Install anc first if you don't have it. Add --output json to get the same JSON shape committed under scorecards/.