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Agent skill

Fastener Hole

by ghbalf in ghbalf/freecad-ai

Create standard fastener holes: clearance, counterbore, or countersink.

LGPL-2.1Auto-check passed

Install Fastener Hole

skills CLI
$ npx skills add ghbalf/freecad-ai --skill fastener-hole -a claude-code

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

GitHub CLI
$ gh skill install ghbalf/freecad-ai fastener-hole --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/ghbalf/freecad-ai.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/fastener-hole .claude/skills/fastener-hole && 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
fastener-hole
GitHub stars
556
Token cost
~487 tokens
SKILL.md length
197 words
Files
1
Skills in repo
9
Repo updated
First seen
Licence
LGPL-2.1

At a glance

Create standard fastener holes: clearance, counterbore, or countersink.

  • Works in 5 steps: Create a sketch on the specified face → For each hole position, add a circle… → Pocket through-all for the clearance hole → …
  • SKILL.md covers Hole types, Parameters to ask (if not…, Construction and Cleanup
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Fastener Hole is an agent skill from ghbalf/freecad-ai. Create standard fastener holes: clearance, counterbore, or countersink.

Its SKILL.md is about 490 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

The repository describes itself as: AI-powered assistant workbench for FreeCAD — generate 3D models from natural language.

Example prompts

  • “/fastener-hole”

Requirements

  • Python 3

Workflow steps

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

  1. Create a sketch on the specified face
  2. For each hole position, add a circle (clearance diameter)
  3. Pocket through-all for the clearance hole
  4. For counterbore: add a second larger circle, pocket to CB depth
  5. For countersink: use a cone (Part.makeCone) to create the 90-degree chamfer

What it can do on your machine

Read from SKILL.md and the folder at commit 11bc3b7. 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 python).

    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

Fastener Hole loads about 487 tokens when it runs. Until then it costs about 21 tokens; SKILL.md has 197 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~21
When it runs · the whole SKILL.md, loaded when a task matches
~487

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 ghbalf/freecad-ai at commit 11bc3b7, republished under its LGPL-2.1 licence (© ghbalf). 197 words, ~487 tokens.

Download SKILL.mdSave it as .claude/skills/fastener-hole/SKILL.md (or your agent's skills folder).
name
fastener-hole
description
Create standard fastener holes: clearance, counterbore, or countersink.

Fastener Hole Patterns

Create standard fastener holes: clearance, counterbore, or countersink.

Hole types

Clearance holes (through-hole for bolt to pass through)
SizeClose fitNormal fit
M22.2mm2.4mm
M2.52.7mm2.9mm
M33.2mm3.4mm
M44.3mm4.5mm
M55.3mm5.5mm
M66.4mm6.6mm
M88.4mm9.0mm
Counterbore (socket head cap screw)
SizeCB diameterCB depth
M36.5mm3.0mm
M48.0mm4.0mm
M510.0mm5.0mm
M611.5mm6.0mm
M815.0mm8.0mm
Countersink (flat head screw, 90 degree)
SizeCS diameter
M36.3mm
M48.4mm
M510.4mm
M612.6mm

Parameters to ask (if not provided)

  • Screw size: M2 through M8
  • Hole type: clearance / counterbore / countersink
  • Fit: close / normal (for clearance holes)
  • Target object: body or feature to cut into
  • Positions: list of XY coordinates, or pattern (linear/circular)
  • Pattern: if applicable — count, spacing, or bolt circle diameter + count

Construction

  1. Create a sketch on the specified face
  2. For each hole position, add a circle (clearance diameter)
  3. Pocket through-all for the clearance hole
  4. For counterbore: add a second larger circle, pocket to CB depth
  5. For countersink: use a cone (Part.makeCone) to create the 90-degree chamfer

Cleanup

After construction, hide all sketches for a clean viewport:

python
for obj in App.ActiveDocument.Objects:
    if obj.TypeId == "Sketcher::SketchObject":
        obj.Visibility = False

© ghbalf, LGPL-2.1. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in skills/fastener-hole of ghbalf/freecad-ai.

Open the folder on GitHubat commit 11bc3b7

Compare with similar skills

Fastener Hole 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.

Fastener Hole compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Fastener Hole this skillghbalf/freecad-ai556—~487Automated safety check: PassLGPL-2.1
Clearanceanthropics/claude-for-legal9.6k3 repos~6.8kAutomated safety check: PassApache-2.0
Telemetry Standardssupabase/supabase111k—~2kAutomated safety check: PassApache-2.0
Cpp Coding Standardsaffaan-m/ECC277k4 repos~5.6kAutomated safety check: PassMIT
Java Coding Standardsaffaan-m/ECC277k1 repos~2.9kAutomated safety check: PassMIT
Coding Standardsaffaan-m/ECC277k3 repos~2.6kAutomated safety check: PassMIT

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Questions about Fastener Hole

What does Fastener Hole do?

Create standard fastener holes: clearance, counterbore, or countersink. Fastener Hole is an agent skill from ghbalf/freecad-ai. Create standard fastener holes: clearance, counterbore, or countersink.

How do I install Fastener Hole in Claude Code?

Run `npx skills add ghbalf/freecad-ai --skill fastener-hole -a claude-code`. Or copy the skill folder (skills/fastener-hole in ghbalf/freecad-ai) into .claude/skills/fastener-hole in your project. Claude Code loads it when a task matches its description.

How do I install Fastener Hole in Codex?

Run `npx skills add ghbalf/freecad-ai --skill fastener-hole -a codex`. Or copy the skill folder (skills/fastener-hole in ghbalf/freecad-ai) into .agents/skills/fastener-hole in your project. Codex loads it when a task matches its description.

Can I use Fastener Hole 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 ghbalf/freecad-ai --skill fastener-hole -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/fastener-hole, .gemini/skills/fastener-hole, .github/skills/fastener-hole and .opencode/skills/fastener-hole in your project.

What does Fastener Hole need to run?

SKILL.md names no scripts, command-line tools or credentials: Fastener Hole is instructions for the agent only. Our summary lists: Python 3.

Does Fastener Hole 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 Fastener Hole 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 Fastener Hole use?

Fastener Hole is published under the LGPL-2.1 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Fastener Hole use?

About 487 tokens (SKILL.md is roughly 1.9k 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 Fastener Hole?

Skills that share tags, products or a category with Fastener Hole: Clearance (anthropics/claude-for-legal, 9.6k stars), Telemetry Standards (supabase/supabase, 111k stars), Cpp Coding Standards (affaan-m/ECC, 277k stars) and Java Coding Standards (affaan-m/ECC, 277k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Fastener Hole?

ghbalf (a GitHub user) maintains it in ghbalf/freecad-ai, which has 556 GitHub stars. The repository holds 9 skills in this directory. The repository was last updated on October 10, 2026.

Source: ghbalf/freecad-ai on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.