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 berkcangumusisik/claude-code-practices --skill impact-analysisgit clone --depth 1 https://github.com/berkcangumusisik/claude-code-practicesWrote 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/berkcangumusisik/claude-code-practices/impact-analysis)<a href="https://agentmods.dev/skills/berkcangumusisik/claude-code-practices/impact-analysis"><img src="https://agentmods.dev/badge/skills/berkcangumusisik/claude-code-practices/impact-analysis.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 5.1 | $0.00018 | $0.00354 |
| Opus 5 | $0.00009 | $0.00177 |
| Sonnet 5 | $0.00004 | $0.00071 |
| Haiku 4.5 | $0.00002 | $0.00035 |
Grade A, and why
impact-analysis 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 6d 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
Impact Analysis
Target: $1 $2
- Find all direct consumers:
grep -rn "from.*$1\|require.*$1\|import.*$1" src/ --include="*.ts" --include="*.tsx" | grep -v "node_modules"
- For each consumer, find their consumers (2 levels deep):
# For each file found above, repeat the grep
-
Check for indirect usage:
- Dynamic imports:
import() - Re-exports: files that
export * from - Type-only imports that might break at runtime
- Dynamic imports:
-
Check test coverage of the target:
grep -rn "$2\|$(basename $1 .ts)" src/ --include="*.test.*" --include="*.spec.*"
- Produce impact map:
src/auth/token.ts → changing this affects:
DIRECT (3 files):
src/middleware/auth.ts ← critical path
src/api/users.ts ← medium risk
src/utils/session.ts ← low risk
INDIRECT (7 files via middleware/auth.ts):
src/api/*.ts ← all protected routes
TESTS (2 files):
src/auth/token.test.ts
src/middleware/auth.test.ts
- Recommend: what tests to run, what to manually verify.
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.
- 6d ago First seen · 49 lines · 18 tokens per session scan A 2cc6c41f7e18
impact-analysis is a skill published in the GitHub repository berkcangumusisik/claude-code-practices (10 stars, last pushed 4mo ago), licensed MIT. It adds 18 tokens to every session and 354 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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