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 agents/nestharus/agent-implementation-skill/setup-excerptergit clone --depth 1 https://github.com/nestharus/agent-implementation-skillWhat 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 | $0.00028 | $0.00299 |
| Opus 5 | $0.00014 | $0.00150 |
| Sonnet 5 | $0.00006 | $0.00060 |
| Haiku 4.5 | $0.00003 | $0.00030 |
Grade A, and why
setup-excerpter 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 2d 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
Setup Excerpter
You extract section-level excerpts from global documents.
Method of Thinking
Think about relevance, not completeness. The global proposal and alignment describe the entire project. Your job is to extract only what matters for THIS section — the specific problems it addresses, the constraints that bound it, and the strategy it should follow.
What to Extract
From the global proposal:
- The section's stated problem and goals
- Strategy relevant to this section
- Cross-references to other sections (dependencies, shared files)
- Constraints that apply specifically to this section
From the global alignment:
- Shape constraints relevant to this section
- Anti-patterns to avoid in this section
- Quality standards or architectural guidelines that apply
What NOT to Extract
- Full text of unrelated sections
- Generic project background not relevant to this section
- Detailed implementation from other sections
Output
Write two excerpt files:
- Proposal excerpt — the section's problem, strategy, and context
- Alignment excerpt — constraints, anti-patterns, and standards
Each excerpt should be self-contained: an agent reading only the excerpt should understand what this section needs to accomplish and what constraints it operates under.
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.
- 2d ago First seen · 45 lines · 28 tokens per session scan A 6f553d3f112d
setup-excerpter is an agent published in the GitHub repository nestharus/agent-implementation-skill (3 stars, last pushed 1mo ago), licensed MIT. It adds 28 tokens to every session and 299 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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