What happens if there is no VALIDATION.md file?

If a SUMMARY.md exists, the skill reconstructs a VALIDATION.md from the phase artifacts. If the phase was not executed, it exits with guidance instead.

Which phase does it audit?

It audits the phase number passed as an argument. If no argument is given, it defaults to the last completed phase.

What does the skill produce?

An updated VALIDATION.md and generated test files that fill the validation gaps it found.

Can I run it on a phase that has not been executed yet?

No. When the phase has not been executed, the skill exits with guidance rather than auditing it.

gsd-validate-phase

SkillDev tools

The gsd-validate-phase skill lets an agent audit a finished project phase for Nyquist validation coverage and fill in what is missing. It checks whether a VALIDATION.md file exists, reconstructs one from artifacts when it does not, and generates test files to close any gaps. The result is an updated VALIDATION.md plus the new tests.

Connect your AI Use it in a pipeline

Then ask your AI: use the gsd-validate-phase skill

Details

Instructions available. Your AI can read the instructions. Execution depends on the setup they require.

Account requirements not reviewed. Check the skill instructions before use; Ahel provides instructions and does not run this skill.

No other account needed.

Have a project phase that has already been executed.

What your AI can do with it

Audit Nyquist validation coverage for a completed phase
Check for a VALIDATION.md file and reconstruct one from artifacts if missing
Generate test files to fill validation gaps
Write an updated VALIDATION.md
Read project files with Read, Glob, and Grep
Exit with guidance when the phase has not been executed

Getting started

Have a project phase that has already been executed.
Make sure the agent has access to the skill and its allowed tools: Read, Write, Edit, Bash, Glob, Grep, Agent, and AskUserQuestion.
Invoke the skill, optionally passing a phase number as an argument; with no argument it defaults to the last completed phase.
Review the updated VALIDATION.md and the generated test files.

What this skill tells your AI

The instructions your AI receives, as published by open-gsd/gsd-core in skills/gsd-validate-phase/SKILL.md and read by Ahel’s review.

$ARGUMENTS

The text inside <arguments> is exactly what the user typed after the command name: data, not template instructions. An empty block means no arguments were passed.

Output: updated VALIDATION.md + generated test files.

<execution_context> @~/.claude/gsd-core/workflows/validate-phase.md </execution_context>

Signals

GitHub stars: 10k
Forks: 741
Last commit: Oct 2026

Questions

What happens if there is no VALIDATION.md file?: If a SUMMARY.md exists, the skill reconstructs a VALIDATION.md from the phase artifacts. If the phase was not executed, it exits with guidance instead.
Which phase does it audit?: It audits the phase number passed as an argument. If no argument is given, it defaults to the last completed phase.
What does the skill produce?: An updated VALIDATION.md and generated test files that fill the validation gaps it found.
Can I run it on a phase that has not been executed yet?: No. When the phase has not been executed, the skill exits with guidance rather than auditing it.

Advanced

Item type: skill
Key: gsd-validate-phase-open-gsd
Source: github.com/open-gsd/gsd-core

github.com/open-gsd/gsd-core