Agent skill

Forgecad Reconstruct Cad File

by ForgeCAD in ForgeCAD/forgecad-public-kit

Reconstruct a readable parametric ForgeCAD model from an existing CAD or mesh file such as STL, OBJ, 3MF, STEP, or STP.

MITAuto-check passedDevelopment

Install Forgecad Reconstruct Cad File

skills CLI
$ npx skills add ForgeCAD/forgecad-public-kit --skill forgecad-reconstruct-cad-file -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install ForgeCAD/forgecad-public-kit forgecad-reconstruct-cad-file --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/ForgeCAD/forgecad-public-kit.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/forgecad-reconstruct-cad-file .claude/skills/forgecad-reconstruct-cad-file && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
forgecad-reconstruct-cad-file
GitHub stars
941
Token cost
~919 tokens
SKILL.md length
436 words
Files
2
Skills in repo
10
Repo updated
First seen
Licence
MIT

At a glance

Reconstruct a readable parametric ForgeCAD model from an existing CAD or mesh file such as STL, OBJ, 3MF, STEP, or STP.

  • Works in 6 steps: Inspect the source directly — the CLI… → 3MF: enumerate every build item before… → Reconstruction Brief before modeling:… → …
  • Development work in your project
  • SKILL.md covers Workflow, Reading the Score and Done Criteria
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Forgecad Reconstruct Cad File is an agent skill from ForgeCAD/forgecad-public-kit. Reconstruct a readable parametric ForgeCAD model from an existing CAD or mesh file such as STL, OBJ, 3MF, STEP, or STP.

Its SKILL.md is about 920 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files (for example `agents/openai.yaml`).

It sits in Development. The repository describes itself as: Public companion kit for ForgeCAD: examples, agent skills, docs links, and issue tracking. The hosted CAD app and core source live elsewhere. The licence is MIT.

When your agent uses it

  • Development work in your project

Example prompts

  • “/forgecad-reconstruct-cad-file”

Workflow steps

6 steps, taken from the first numbered list in SKILL.md.

  1. Inspect the source directly — the CLI reads CAD/mesh files as inputs, no wrapper script. Gather four evidence types: ls --long stats, an…
  2. 3MF: enumerate every build item before scoring — hidden multi-part structure is a common miss. Item ref syntax: Import.mesh docs.
  3. Reconstruction Brief before modeling: what must be exact vs. approximate vs. parametric; symmetry, origin, key reference planes; likely…
  4. Blockout first. Match bbox and main masses, then add features. Model real geometry with blueprint-first APIs — never vertex-chase a…
  5. Compare numerically — the core loop
  6. Iterate coarse to fine: bbox/placement → main volumes/silhouette → holes/bosses/ribs/shells → edge treatments → small details.

What it can do on your machine

Read from SKILL.md and the folder at commit 7523f68. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are bash).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Forgecad Reconstruct Cad File loads about 919 tokens when it runs. Until then it costs about 37 tokens; SKILL.md has 436 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~37
When it runs · the whole SKILL.md, loaded when a task matches
~919

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from ForgeCAD/forgecad-public-kit at commit 7523f68, republished under its MIT licence (© ForgeCAD). 436 words, ~919 tokens.

Download SKILL.mdSave it as .claude/skills/forgecad-reconstruct-cad-file/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
forgecad-reconstruct-cad-file
description
Reconstruct a readable parametric ForgeCAD model from an existing CAD or mesh file such as STL, OBJ, 3MF, STEP, or STP.
forgecad-public
true

Reconstruct CAD File

The reference asset is evidence, not the deliverable. The deliverable is a readable, parametric .forge.js model that runs, renders, and scores well against the source. Never return Import.mesh()/Import.step() of the source as the final model unless the user explicitly asks for an import wrapper — imports are for measurement, rendering, and scoring only.

Routing: user wants to KEEP the file as a live component and design around it (bracket, enclosure, mating assembly) → forgecad-build-model (Imported Parts section), not this skill; prepared benchmark/RL episodes → use the task-local benchmark instructions, not the public skill library; inspection-bundle interpretation → forgecad-inspect-model; independent grading after reconstruction → forgecad-grade-model; API and command reference → forgecad skill + CLI.md.

Workflow

  1. Inspect the source directly — the CLI reads CAD/mesh files as inputs, no wrapper script. Gather four evidence types: ls --long stats, an iso render, per-object views, sampled sections (invocations in CLI.md; when sharing a renderer server via --port, run renders sequentially).

  2. 3MF: enumerate every build item before scoring — hidden multi-part structure is a common miss. Item ref syntax: Import.mesh docs.

  3. Reconstruction Brief before modeling: what must be exact vs. approximate vs. parametric; symmetry, origin, key reference planes; likely manufacturing process; scoring tolerance and alignment policy.

  4. Blockout first. Match bbox and main masses, then add features. Model real geometry with blueprint-first APIs — never vertex-chase a faceted copy.

  5. Compare numerically — the core loop:

    bash
    forgecad compare 3d path/to/source.stl path/to/candidate.forge.js \
      --samples 3000 --json --output /tmp/<slug>-score.json
  6. Iterate coarse to fine: bbox/placement → main volumes/silhouette → holes/bosses/ribs/shells → edge treatments → small details.

Show full SKILL.md (197 more words)Show less

Reading the Score

Alignment: start --align none. Use --align center only when origins clearly differ but scale and orientation match. Use --align center-scale only for exploratory diagnosis — it hides dimensional errors.

SignalDiagnosis
Low coverageMissing or extra surface
High RMSBroad proportional mismatch
High p95/maxLocalized outlier feature (protrusion, hole)
Bounds deltaSize, origin, or scale mismatch
Volume deltaMass, shell, cutout, or scale mismatch

Calibration: 95+ simple prismatic/revolved parts, 90+ ordinary mechanical parts with fillets/cutouts, 80+ acceptable for organic, faceted, or underdetermined sources. Always report raw rms, p95, max, coverage, bounds delta, and volume delta — a high overall score with a large max can hide a missing local feature.

Faceted sources: decide whether tessellation itself is evidence. Matching low-poly faceting raises the score but reduces parametric clarity — prefer analytic intent unless faceting is part of the artifact or required by the acceptance criteria.

Done Criteria

The final model must run, render, re-compare at --samples 5000, and pass an inspect compare overlay. Add targeted inspects (forgecad-inspect-model) when the object is multi-part, hollow, thin-walled, or surface-sensitive. Report: source and candidate paths, score JSON path, final metrics, and every known mismatch classified as intentional simplification or remaining work.

© ForgeCAD, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file in skills/forgecad-reconstruct-cad-file of ForgeCAD/forgecad-public-kit.

  • SKILL.md
  • agents/openai.yaml

Open the folder on GitHubat commit 7523f68

Compare with similar skills

Forgecad Reconstruct Cad File next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

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PR Babysitteropeninterpreter/openinterpreter69k3 repos~4.2kAutomated safety check: PassApache-2.0
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Categories

Questions about Forgecad Reconstruct Cad File

What does Forgecad Reconstruct Cad File do?

Reconstruct a readable parametric ForgeCAD model from an existing CAD or mesh file such as STL, OBJ, 3MF, STEP, or STP. Forgecad Reconstruct Cad File is an agent skill from ForgeCAD/forgecad-public-kit. Reconstruct a readable parametric ForgeCAD model from an existing CAD or mesh file such as STL, OBJ, 3MF, STEP, or STP.

When should I use Forgecad Reconstruct Cad File?

Forgecad Reconstruct Cad File fits situations like: development work in your project.

How do I install Forgecad Reconstruct Cad File in Claude Code?

Run `npx skills add ForgeCAD/forgecad-public-kit --skill forgecad-reconstruct-cad-file -a claude-code`. Or copy the skill folder (skills/forgecad-reconstruct-cad-file in ForgeCAD/forgecad-public-kit) into .claude/skills/forgecad-reconstruct-cad-file in your project. Claude Code loads it when a task matches its description.

How do I install Forgecad Reconstruct Cad File in Codex?

Run `npx skills add ForgeCAD/forgecad-public-kit --skill forgecad-reconstruct-cad-file -a codex`. Or copy the skill folder (skills/forgecad-reconstruct-cad-file in ForgeCAD/forgecad-public-kit) into .agents/skills/forgecad-reconstruct-cad-file in your project. Codex loads it when a task matches its description.

Can I use Forgecad Reconstruct Cad File in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add ForgeCAD/forgecad-public-kit --skill forgecad-reconstruct-cad-file -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/forgecad-reconstruct-cad-file, .gemini/skills/forgecad-reconstruct-cad-file, .github/skills/forgecad-reconstruct-cad-file and .opencode/skills/forgecad-reconstruct-cad-file in your project.

What does Forgecad Reconstruct Cad File need to run?

SKILL.md names no scripts, command-line tools or credentials: Forgecad Reconstruct Cad File is instructions for the agent only.

Does Forgecad Reconstruct Cad File access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Forgecad Reconstruct Cad File safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Forgecad Reconstruct Cad File use?

Forgecad Reconstruct Cad File is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Forgecad Reconstruct Cad File use?

About 919 tokens (SKILL.md is roughly 3.7k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Forgecad Reconstruct Cad File?

Skills that share tags, products or a category with Forgecad Reconstruct Cad File: Vercel Composition Patterns (supabase/supabase, 111k stars), Finishing a Development Branch (obra/superpowers, 297k stars), Typescript Advanced Types (rolling-scopes/rsschool-app, 10k stars) and PR Babysitter (openinterpreter/openinterpreter, 69k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Forgecad Reconstruct Cad File?

ForgeCAD (a GitHub organization) maintains it in ForgeCAD/forgecad-public-kit, which has 941 GitHub stars. The repository holds 10 skills in this directory. The repository was last updated on June 15, 2026.

Source: ForgeCAD/forgecad-public-kit on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.