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/yarlson/yarstack/changes-explainnpx skills add yarlson/yarstack --skill changes-explaingit clone --depth 1 https://github.com/yarlson/yarstackWhat 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 | $0.00048 | $0.00259 |
| Opus 5 | $0.00024 | $0.00130 |
| Sonnet 5 | $0.00010 | $0.00052 |
| Haiku 4.5 | $0.00005 | $0.00026 |
Grade A, and why
changes-explain 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 yesterday.
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
Explain Changes
Translate a confirmed code comparison into system effects without inventing intent or exposing sensitive content.
Workflow
- Confirm the comparison scope; stop or qualify the explanation when it cannot be isolated.
- Read the diff, full changed files, relevant surrounding code, tests, configuration, and linked in-scope brief.
- Group edits by changed behavior or responsibility rather than file mechanics.
- Explain previous and new behavior, affected owner or boundary, data and control flow, external interactions, and user, developer, runtime, or operational effects.
- Describe materially changed failure, compatibility, rollout, CI, verification, and residual-risk behavior.
- Distinguish observed evidence, documented intent, and inference.
Keep the task read-only. Redact secrets and sensitive diff content. Use code-review for defect findings and rollout-readiness-review for operational-readiness judgment.
Finish when every material change group is explained and evidence limitations are stated. Omit syntax trivia and empty sections.
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.
- yesterday First seen · 22 lines · 48 tokens per session scan A 539b5c9d2ca3
changes-explain is a skill published in the GitHub repository yarlson/yarstack (3 stars, last pushed 4d ago), licensed MIT. It adds 48 tokens to every session and 259 once invoked, about $0.0002 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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