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 spec-writergit 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/spec-writer)<a href="https://agentmods.dev/skills/alpacalabsllc/skills-for-architects/spec-writer"><img src="https://agentmods.dev/badge/skills/alpacalabsllc/skills-for-architects/spec-writer/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/spec-writer"><img src="https://agentmods.dev/badge/skills/alpacalabsllc/skills-for-architects/spec-writer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Prompt Injection · line 15 Hidden instructions were detected in comments or invisible text. These could contain malicious directives. Manual review is recommended.Fix: Audit all comments and invisible characters. Remove any instructions that direct the agent to perform unauthorized actions. Use plain, reviewable content.
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 | $0.00039 | $0.02731 |
| Opus 5 | $0.00019 | $0.01366 |
| Sonnet 5 | $0.00008 | $0.00546 |
| Haiku 4.5 | $0.00004 | $0.00273 |
Grade A, and why
spec-writer scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 13d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 215 lines — stays where its author put it; the contents beside it link to each section on GitHub.
/as:spec-writer — CSI Outline Specification Writer
Harness note: use
/as:<skill>on Claude Code and$<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.
Takes a materials list, product schedule, or project description and produces outline specifications organized by CSI MasterFormat 2020 divisions. Output is a structured .md file ready for review by a senior specifier.
Project context
If PROJECT.md exists in the working directory, read it and scan decisions/*.md directly for material and product choices already made; specs must reflect decided records rather than re-litigate them. After completing, offer referenced spec sections to /as:project update, with source and date. No PROJECT.md? Skip silently — or mention /as:project init if the user is clearly starting a project.
Input
The user provides materials/products in one of these ways:
- Pasted text — a materials list, product schedule, or finish legend copied into the conversation
- File path — path to a CSV, Excel export, schedule PDF, or markdown file containing materials/products
- Verbal description — project type and general materials ("ground-up office with curtain wall, porcelain tile, ACT ceilings, painted gypsum board")
If the user invokes the skill without input, ask:
- What is the project type? (e.g., commercial office, multifamily residential, retail, healthcare, education)
- What materials or products should be specified? (paste a list, provide a file path, or describe them)
CSI MasterFormat Divisions Covered
Map every material/product to the correct division and section number using MasterFormat 2020:
| Division | Title | Common Sections |
|---|---|---|
| 03 | Concrete | 03 30 00 Cast-in-Place Concrete, 03 45 00 Precast Architectural Concrete |
| 04 | Masonry | 04 20 00 Unit Masonry, 04 40 00 Stone Assemblies |
| 05 | Metals | 05 12 00 Structural Steel Framing, 05 50 00 Metal Fabrications, 05 51 00 Metal Stairs |
| 06 | Wood, Plastics, and Composites | 06 10 00 Rough Carpentry, 06 20 00 Finish Carpentry, 06 40 00 Architectural Woodwork |
| 07 | Thermal and Moisture Protection | 07 21 00 Thermal Insulation, 07 27 00 Air Barriers, 07 46 00 Siding, 07 54 00 Thermoplastic Membrane Roofing, 07 84 00 Firestopping, 07 92 00 Joint Sealants |
| 08 | Openings | 08 11 00 Metal Doors and Frames, 08 14 00 Wood Doors, 08 44 00 Curtain Wall, 08 80 00 Glazing |
| 09 | Finishes | 09 21 00 Plaster and Gypsum Board, 09 30 00 Tiling, 09 51 00 Acoustical Ceilings, 09 65 00 Resilient Flooring, 09 68 00 Carpeting, 09 91 00 Painting |
| 10 | Specialties | 10 14 00 Signage, 10 21 00 Compartments and Cubicles, 10 28 00 Toilet Accessories |
| 12 | Furnishings | 12 24 00 Window Shading, 12 36 00 Countertops, 12 48 00 Rugs and Mats |
| 22 | Plumbing (fixtures only) | 22 40 00 Plumbing Fixtures |
| 26 | Electrical (fixtures only) | 26 50 00 Lighting |
What ships with it
2 files 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.
- 13d ago First seen · 215 lines · 39 tokens per session scan A 7983187a3195
spec-writer is a skill published in the GitHub repository AlpacaLabsLLC/skills-for-architects (353 stars, last pushed 9d ago), licensed MIT. It adds 39 tokens to every session and 2,731 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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