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 skills add tjboudreaux/cc-plugin-engineering-excellence --skill eng-rigorous-validationgit clone --depth 1 https://github.com/tjboudreaux/cc-plugin-engineering-excellenceWrote 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/tjboudreaux/cc-plugin-engineering-excellence/eng-rigorous-validation)<a href="https://agentmods.dev/skills/tjboudreaux/cc-plugin-engineering-excellence/eng-rigorous-validation"><img src="https://agentmods.dev/badge/skills/tjboudreaux/cc-plugin-engineering-excellence/eng-rigorous-validation/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/tjboudreaux/cc-plugin-engineering-excellence/eng-rigorous-validation"><img src="https://agentmods.dev/badge/skills/tjboudreaux/cc-plugin-engineering-excellence/eng-rigorous-validation.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00025 | $0.00348 |
| Opus 5 | $0.00013 | $0.00174 |
| Sonnet 5 | $0.00005 | $0.00070 |
| Haiku 4.5 | $0.00003 | $0.00035 |
Grade A, and why
eng-rigorous-validation 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 8d 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.
What it actually says
Rigorous Validation
Intent
- Ship only when behavior is proven, not assumed.
- Treat tests, QA scripts, linters, and on-chain/off-chain simulations as first-class deliverables.
- Capture evidence so reviewers can verify quickly.
Inputs
- Canonical test commands (unit, integration, e2e, contract sims, UI snapshots).
- Acceptance criteria plus measurable signals (logs, screenshots, transaction hashes).
- Migrations/seed data steps required to exercise the change locally.
Workflow
- Design tests before coding
- Specify failing cases and target assertions for each requirement.
- Align on how to stub external services, wallets, or platform APIs.
- Automate and isolate
- Prefer deterministic, headless test harnesses; avoid manual-only steps.
- Seed data/fixtures close to tests to prevent global coupling.
- Run the full relevant matrix
- Cover affected platforms (iOS/Android/web), runtimes, or chain environments.
- Capture artifacts (logs, screenshots, traces) for any non-deterministic checks.
- Track outcomes
- Record exact commands run and their commit hash in the PR or issue.
- File follow-ups for flaky tests before merging.
Verification
- All targeted tests green and documented; no TODOs or skipped suites without owner sign-off.
- Static analysis, type-checking, formatters, and contract analyzers pass.
- Evidence (artifacts, hashes, screenshots) attached or linked for reviewer inspection.
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.
- 8d ago First seen · 36 lines · 25 tokens per session scan A 0efcf0c37850
eng-rigorous-validation is a skill published in the GitHub repository tjboudreaux/cc-plugin-engineering-excellence (4 stars, last pushed 7mo ago), licensed MIT. It adds 25 tokens to every session and 348 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.
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