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 AlpacaLabsLLC/skills-for-architects --skill epd-comparegit clone --depth 1 https://github.com/AlpacaLabsLLC/skills-for-architectsWrote 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/alpacalabsllc/skills-for-architects/epd-compare)<a href="https://agentmods.dev/skills/alpacalabsllc/skills-for-architects/epd-compare"><img src="https://agentmods.dev/badge/skills/alpacalabsllc/skills-for-architects/epd-compare/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/alpacalabsllc/skills-for-architects/epd-compare"><img src="https://agentmods.dev/badge/skills/alpacalabsllc/skills-for-architects/epd-compare.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00038 | $0.02807 |
| Opus 5 | $0.00019 | $0.01404 |
| Sonnet 5 | $0.00008 | $0.00561 |
| Haiku 4.5 | $0.00004 | $0.00281 |
Grade A, and why
epd-compare scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 214 lines — stays where its author put it; the contents beside it link to each section on GitHub.
/as:epd-compare — EPD Comparator
Harness note: use
/as:<skill>on Claude Code and$<skill>on Codex. Resolve<skill-root>as the directory containing this loadedSKILL.mdand<plugin-root>as the plugin root that containsskills/, and use equivalent native tools when host tool names differ.
Compare 2 or more products side-by-side on environmental impact metrics. Validates comparability (declared units, system boundaries, PCR alignment), generates comparison tables with percentage deltas, and checks LEED v4.1 MRc2 eligibility.
This skill reads EPD records but does not persist or modify them. Fields follow schema/epd-schema.md, which is distinct from the FF&E product schema. Output is a markdown comparison report.
Input
The user provides EPD data in one of these ways:
- Inline data — pasted product names with GWP values
- File path — a canonical
epd-library.csvor markdown file with EPD data - From prior skills — "compare the EPDs I just parsed/found" (uses structured data from the current conversation)
- Mixed — combine pasted, prior, and canonical local CSV records
If the user doesn't specify a source, first use structured EPD data from the current conversation. Otherwise ask for pasted values or an EPD CSV path. When reading epd-library.csv, validate it with python3 "<plugin-root>/skills/master-schedule/scripts/csv-library.py" validate epd; reject FF&E-shaped or malformed files. Validation is read-only; never invoke init, import, append, or update.
Workflow
Step 1: Collect data
Gather EPD data from the specified source. For each product, you need at minimum:
- Product name and manufacturer
- GWP (A1-A3) value
- Declared unit
Additional fields improve the comparison: ODP, AP, EP, POCP, energy use, water use, system boundary, PCR, validity dates, LEED eligibility.
Step 2: Validate comparability
Before comparing, run these checks and report findings:
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 12d ago First seen · 214 lines · 38 tokens per session scan A d1668a8911ef
epd-compare is a skill published in the GitHub repository AlpacaLabsLLC/skills-for-architects (351 stars, last pushed 8d ago), licensed MIT. It adds 38 tokens to every session and 2,807 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 2026-08-30.
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