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.
npx agentmods add skills/mathews-tom/armory/env-validatornpx skills add Mathews-Tom/armory --skill env-validatorgit clone --depth 1 https://github.com/Mathews-Tom/armoryWrote 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.
[](https://agentmods.dev/skills/mathews-tom/armory/env-validator)<a href="https://agentmods.dev/skills/mathews-tom/armory/env-validator"><img src="https://agentmods.dev/badge/skills/mathews-tom/armory/env-validator.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00066 | $0.01179 |
| Opus 5 | $0.00033 | $0.00589 |
| Sonnet 5 | $0.00013 | $0.00236 |
| Haiku 4.5 | $0.00007 | $0.00118 |
Grade A, and why
env-validator 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 4d ago.
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.
How it starts
The opening of the file, as written. The whole thing — 145 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Env Validator
Validates environment variable configurations by cross-referencing .env files against
project requirements. Catches missing variables, type errors, insecure defaults, and
orphaned entries before they cause runtime failures.
Reference Files
| File | Contents | Load When |
|---|---|---|
references/validation-rules.md |
Built-in validation rules and severity definitions | Always |
Prerequisites
- A
.envfile (or equivalent) in the project - Optionally:
.env.example,docker-compose.yml, or deployment manifests for cross-referencing
Workflow
Phase 1: Discovery
Locate environment configuration sources in the project:
- Primary file: Find
.envin the project root. If absent, check for.env.local,.env.development,.env.production - Schema file: Find
.env.exampleor.env.template— this defines the expected variables - Code references: Grep for
os.environ,process.env,env::var,os.Getenvpatterns to find variables referenced in code - Deployment manifests: Check
docker-compose.yml,Dockerfile,k8s/manifests for${VAR}orENV VARpatterns
Report what was found before proceeding.
Phase 2: Schema Extraction
Build the expected variable schema from discovered sources:
For each variable found across all sources, record:
| Field | Source |
|---|---|
| Name | Variable name (e.g., DATABASE_URL) |
| Required | Present in code references or marked required in example |
| Type hint | Inferred from usage (URL, integer, boolean, string, path) |
| Default | Value in .env.example if present |
| Used in | List of files that reference this variable |
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 4d ago First seen · 145 lines · 66 tokens per session scan A 9c9a0cd83590
env-validator is a skill published in the GitHub repository Mathews-Tom/armory (316 stars, last pushed 5d ago), licensed MIT. It adds 66 tokens to every session and 1,179 once invoked, about $0.0003 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 2026-08-30.
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