# Runtime Validation

> Catch the bugs a green test suite misses by observing REAL runtime behavior — tail application logs during test/server runs, validate API responses against their schema contracts, and assert data-integrity invariants (density ≤ 1.0, %≤100, referential integrity). Use when unit tests pass 100% but the running app still errors, when a Pydantic/Zod/serde validation error or schema drift shows up only at runtime, when reviewing whether a test suite actually exercises the running system, or when someone says "all tests pass but it's broken", "smoke test", "the mocks lied", or "verify it works live".

## Facts
- Page: https://tashan.sh/capability/skill-nxtg-ai-runtime-validation
- tashan id: skill:nxtg-ai/runtime-validation
- Source: https://github.com/nxtg-ai/forge-plugin
- Type: skill
- Category: devtools
- tashan score: not scored (catalogued only — too little public evidence)
- Adoption: 9.0
- Upkeep: 96.0
- Freshness: 91.0
- Evidence coverage: 84% of the inputs this score can use
- Health: active
- Instruction depth: not yet graded
- License: MIT
- Official: no

## Install

```sh
cp -r runtime-validation ~/.claude/skills/
```

## Security audit
Not scanned. We audit npm-published capabilities; this one has no npm package we can resolve, or has not reached the queue. This is not a clean bill of health.

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Measured 2026-08-21 by tashan (https://tashan.sh) from public evidence. Scorer s5.