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 commands/flyfission/nuclear-grade-context-engineering/ng-impactgit clone --depth 1 https://github.com/FlyFission/nuclear-grade-context-engineeringWrote 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/commands/flyfission/nuclear-grade-context-engineering/ng-impact)<a href="https://agentmods.dev/commands/flyfission/nuclear-grade-context-engineering/ng-impact"><img src="https://agentmods.dev/badge/commands/flyfission/nuclear-grade-context-engineering/ng-impact.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 | $0.00000 | $0.00569 |
| Opus 5 | $0.00000 | $0.00284 |
| Sonnet 5 | $0.00000 | $0.00114 |
| Haiku 4.5 | $0.00000 | $0.00057 |
Grade A, and why
ng-impact 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 — 46 lines — stays where its author put it; the contents beside it link to each section on GitHub.
ng-impact
Portable command prompt generated from skills/checking-what-a-change-affects/SKILL.md. Edit the skill, then run python tools/ng.py gen-commands; do not edit this file by hand.
Screens what a controlled change might leave out of date across docs, tests, skills, commands, templates, checkers, prompts, releases, saved versions, and evidence, and names the triggers to re-check. Use when a change touches a controlled item. Do not use for a single edit that nothing else depends on.
Use when
- A change affects more than one kind of artifact.
- A change touches a running system, a schema, stored data, or an API other code depends on (brownfield or migration work).
- Public claims, where ideas came from, checkers, tests, templates, skills, commands, dependencies, prompts, or the release may need updates.
- A saved version or a re-check trigger may change.
- A near miss, a weak control, or a lesson from real operation (OPEX) hints at hidden ripple effects.
Do not use when
- The change is clearly Quick. It affects one local item and needs one proof step.
- A current
change-impact.mdalready covers the exact scope.
Inputs
- The controlled-item list.
risk.md,basis.md,plan.md, and the diff.docs/02-operating-system/change-impact.md.
Prompt text
Run a Nuclear-grade ripple-effect check.
Inputs:
- packet:
- controlled items:
- planned or actual diff:
For each family of files, decide one of: update, leave as is, defer, or block. Name the updates needed, the controls now stale, the evidence links, the owners, and what should trigger a re-check. Pay close attention to public claims, validator behavior, source-lineage notes, handoffs, trust checks, lessons from operation (OPEX), and the release. When the change touches a running system or stored data, also screen the runtime blast radius: schema and state migration, API consumers that depend on the contract, backward-compatibility, and rollback-of-state.
Verification
- No stale public claim, test, checker, skill, command, template, or release record is quietly accepted.
- Deferred ripple effects have owners and triggers.
- Blocking ripple effects show up in the release posture.
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 · 46 lines · 0 tokens per session scan A 12dec24b6442
ng-impact is a command published in the GitHub repository FlyFission/nuclear-grade-context-engineering (33 stars, last pushed 25d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 569 tokens. 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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