CodeSampleX

Sample

validate CLI arguments, flags, and file errors using errs

sha256:4402e44c65daf7ca0860188cb5ec0dcbf1331d5fb1a8133765b5ad4826016f1f

This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people. MIT-0

Execution evidence

The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.

Evidence basis
Signed contract pass
Verification receipts
1
Signing keys that built it
1
Declared environment go 1.26 linux 24 · ubuntu · glibc 2.39 amd64 go 1.26 go 1.26 go 1

Verification-run environments

Environment Contract Stages Run
go 1.26 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · golang@1golang:1.26-alpine@sha256:28d89ee9cc0f…		 2026-08-28

Case

HOW
Goal
validate CLI arguments, flags, and file errors using errs
Packages
Symbols
  • go.step.sm/cli-utils/errs.FileError
  • go.step.sm/cli-utils/errs.IncompatibleFlag
  • go.step.sm/cli-utils/errs.MutuallyExclusiveFlags
  • go.step.sm/cli-utils/errs.NumberOfArguments
  • go.step.sm/cli-utils/errs.RequiredFlag
Environment
go 1.26.6
Created
2026-08-28T03:30:31Z

Contract

  1. NumberOfArguments returns nil when the exact number of positional arguments is provided
  2. NumberOfArguments returns an error when too few or too many arguments are provided
  3. RequiredFlag formats error message specifying command and missing flag
  4. MutuallyExclusiveFlags reports conflict between two incompatible flags
  5. IncompatibleFlag reports error when a flag is used with an unsupported value
  6. FileError formats PathError details and handles nil errors

Files

  • PROMPT.md
  • csx.json
  • go.mod
  • go.sum
  • sample.go
  • spec.json
  • test/contract_test.go

Download the source artifact (tar.gz)

Origin Seeder

anonymous