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 Ed3Design/ed3design-engineering-bundles --skill cad-constructiongit clone --depth 1 https://github.com/Ed3Design/ed3design-engineering-bundlesWrote 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/ed3design/ed3design-engineering-bundles/cad-construction)<a href="https://agentmods.dev/skills/ed3design/ed3design-engineering-bundles/cad-construction"><img src="https://agentmods.dev/badge/skills/ed3design/ed3design-engineering-bundles/cad-construction/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/ed3design/ed3design-engineering-bundles/cad-construction"><img src="https://agentmods.dev/badge/skills/ed3design/ed3design-engineering-bundles/cad-construction.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00175 | $0.02301 |
| Opus 5 | $0.00088 | $0.01151 |
| Sonnet 5 | $0.00035 | $0.00460 |
| Haiku 4.5 | $0.00017 | $0.00230 |
Grade A, and why
cad-construction 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 9d 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 — 199 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CAD Construction
A structured workflow for translating a finalized design into a parametric CAD model. This skill assumes the design exploration phase is done — the concept is decided, the remaining work is turning it into geometry.
When to use this skill
- The design concept is settled (possibly via design-first-iteration) and implementation can start
- The user needs to plan component decomposition before opening CAD
- The user wants a parameter table structured before sketching begins
- The user needs a step-by-step construction sequence (sketches → features → assembly)
- The user wants a construction plan document they can follow or hand over
When NOT to use
- Open exploration of design options →
design-first-iteration - General mechanical design rules (overhang, wall thickness, snap-fits) →
mechanical-design-principles - Writing scripts or Python code for CAD automation →
cad-api-scripting - Reviewing an existing CAD model for quality issues → use a dedicated design-review pass with CAD context
Workflow — 4 phases
Phase 1: Requirements consolidation
The design exploration has already happened. This phase is about confirming and writing down the requirements that will drive the CAD work — not re-opening decisions.
Inputs to capture:
- Primary function (what the part must do)
- Secondary requirements (nice-to-have, optional features)
- Environmental conditions (temperature, moisture, UV, vibration, IP rating if relevant)
- Manufacturing method (FDM 3D print, SLA, CNC, injection molding — each has different CAD implications)
- Unresolved conflicts carried over from design phase (if any — flag them explicitly)
Output: A short requirements block at the top of the construction plan. Not a re-exploration.
Clarifying questions (if gaps remain): Max 2–3 targeted questions for truly unresolved aspects. Example:
- "IP rating confirmed at IP65, or still IP54 as earlier?"
- "Final material choice — ABS or ASA?"
- "Tool-less opening stays as requirement?"
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.
- 9d ago First seen · 199 lines · 175 tokens per session scan A 8f8ed90405bc
cad-construction is a skill published in the GitHub repository Ed3Design/ed3design-engineering-bundles (2 stars, last pushed 1mo ago), licensed MIT. It adds 175 tokens to every session and 2,301 once invoked, about $0.0009 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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