validate

validate is a command for Claude Code from scenario-labs/skills. It costs 20 tokens per session (2,093 once invoked), scanned A, original, MIT.

A command that tests one skill by giving it to a fresh coding agent and asking that agent to perform real work. It then reports where the agent became stuck, including the result in a pull request when requested.

In plain words
What is it for?
Use it to validate a skill against a realistic task, run a planning-only check, target a specific pull request, or keep the run files for inspection.
Why use it?
It reveals unclear or incomplete instructions by checking whether a new agent can use the skill without relying on prior context.

Command for Claude Code

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add commands/scenario-labs/skills/validate
Clone the repo
git clone --depth 1 https://github.com/scenario-labs/skills

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for validate

README.md
[![agentmods](https://agentmods.dev/badge/commands/scenario-labs/skills/validate.svg)](https://agentmods.dev/commands/scenario-labs/skills/validate)
Your own site
<a href="https://agentmods.dev/commands/scenario-labs/skills/validate"><img src="https://agentmods.dev/badge/commands/scenario-labs/skills/validate.svg" alt="Measured on agentmods" height="20"></a>
Per session 20 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,093 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00020 $0.02093
Opus 5 $0.00010 $0.01046
Sonnet 5 $0.00004 $0.00419
Haiku 4.5 $0.00002 $0.00209

Measured today against content hash 0933affdf76a, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

validate scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured today.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude/commands/skills/validate.md · 124 lines

How it starts

The opening of the file, as written. The whole thing — 124 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Validate the skill named in $ARGUMENTS by having a fresh agent do real work with it, then report where that agent got stuck. A defect here is a defect in the skill text, never in the agent.

Flags: --pr <number> targets a PR instead of detecting one, --plan-only runs the zero-cost planning protocol from AGENTS.md instead of live generation, --task "..." supplies the use case instead of writing one, --no-post stops before publishing anything, --keep keeps the run directory.

Live runs spend Scenario credits. Keep every generation the smallest one that still proves the point.

1. Review the objective

Read skills/<name>/SKILL.md and every file it links. If the name matches no directory under skills/, list the close ones and stop.

State, in your own words: the objective (one sentence), the triggering conditions the description claims, and the three to six non-obvious facts the skill exists to teach, the ones an agent would otherwise guess wrong (upload flow, jobs_wait re-calls, runs_as wiring, dry runs, launch semantics). Those facts are the traps the run has to spring.

2. Write a concrete use case

One realistic task, in the words a user would actually use, that forces at least three of those traps and cannot be satisfied by generic MCP intuition. Give it explicit success criteria (which artifacts must exist, and what has to be true of them) and a hard budget (how many generations, which of them may be dry_run). Print the task and the criteria before spending anything. With --task, use the supplied task and still write the criteria.

3. Run the mechanical checks first

They are free and they catch the cheap failures: pnpm spec (spec validation), plus pnpm test when the skill ships a script. Record the results and continue either way; the report carries both layers.

4. Spin up the fresh agent

Build a run directory outside the repository and install the skill under test into it, from the working tree, so the run tests the version under review rather than the published one:

Read the full file on GitHub · 124 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. today Changed 0933affdf76a
  2. 3d ago First seen · 124 lines · 20 tokens per session scan A a46964868ada

Subscribe to this mod's changes

validate is a command published in the GitHub repository scenario-labs/skills (10 stars, last pushed yesterday), licensed MIT. It adds 20 tokens to every session and 2,093 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.