Agent skill

Sketchforge MCP Skill

by Formsmith746 in Formsmith746/SketchForge-3D

Control a live local SketchForge editor through its MCP server.

AGPL-3.0Auto-check passedAgent Workflows

Install Sketchforge MCP Skill

skills CLI

$ npx skills add Formsmith746/SketchForge-3D --skill sketchforge-mcp-skill -a claude-code

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

GitHub CLI

$ gh skill install Formsmith746/SketchForge-3D sketchforge-mcp-skill --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/Formsmith746/SketchForge-3D.git skills-src && mkdir -p .claude/skills && cp -r skills-src/docs/skills/sketchforge-mcp-skill .claude/skills/sketchforge-mcp-skill && 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/

Paste into Claude Code

Install the "sketchforge-mcp-skill" agent skill from https://github.com/Formsmith746/SketchForge-3D/tree/main/docs/skills/sketchforge-mcp-skill into .claude/skills/sketchforge-mcp-skill/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sketchforge-mcp-skill", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/Formsmith746/SketchForge-3D/tree/main/docs/skills/sketchforge-mcp-skill

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add Formsmith746/SketchForge-3D --skill sketchforge-mcp-skill -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install Formsmith746/SketchForge-3D sketchforge-mcp-skill --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/Formsmith746/SketchForge-3D.git skills-src && mkdir -p .agents/skills && cp -r skills-src/docs/skills/sketchforge-mcp-skill .agents/skills/sketchforge-mcp-skill && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "sketchforge-mcp-skill" agent skill from https://github.com/Formsmith746/SketchForge-3D/tree/main/docs/skills/sketchforge-mcp-skill into .agents/skills/sketchforge-mcp-skill/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sketchforge-mcp-skill", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add Formsmith746/SketchForge-3D --skill sketchforge-mcp-skill -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install Formsmith746/SketchForge-3D sketchforge-mcp-skill --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/Formsmith746/SketchForge-3D.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/docs/skills/sketchforge-mcp-skill .cursor/skills/sketchforge-mcp-skill && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "sketchforge-mcp-skill" agent skill from https://github.com/Formsmith746/SketchForge-3D/tree/main/docs/skills/sketchforge-mcp-skill into .cursor/skills/sketchforge-mcp-skill/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sketchforge-mcp-skill", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/Formsmith746/SketchForge-3D.git --path docs/skills/sketchforge-mcp-skill

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add Formsmith746/SketchForge-3D --skill sketchforge-mcp-skill -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install Formsmith746/SketchForge-3D sketchforge-mcp-skill --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/Formsmith746/SketchForge-3D.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/docs/skills/sketchforge-mcp-skill .gemini/skills/sketchforge-mcp-skill && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "sketchforge-mcp-skill" agent skill from https://github.com/Formsmith746/SketchForge-3D/tree/main/docs/skills/sketchforge-mcp-skill into .gemini/skills/sketchforge-mcp-skill/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sketchforge-mcp-skill", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install Formsmith746/SketchForge-3D sketchforge-mcp-skill

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add Formsmith746/SketchForge-3D --skill sketchforge-mcp-skill -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/Formsmith746/SketchForge-3D.git skills-src && mkdir -p .github/skills && cp -r skills-src/docs/skills/sketchforge-mcp-skill .github/skills/sketchforge-mcp-skill && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "sketchforge-mcp-skill" agent skill from https://github.com/Formsmith746/SketchForge-3D/tree/main/docs/skills/sketchforge-mcp-skill into .github/skills/sketchforge-mcp-skill/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sketchforge-mcp-skill", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add Formsmith746/SketchForge-3D --skill sketchforge-mcp-skill -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install Formsmith746/SketchForge-3D sketchforge-mcp-skill --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/Formsmith746/SketchForge-3D.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/docs/skills/sketchforge-mcp-skill .opencode/skills/sketchforge-mcp-skill && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "sketchforge-mcp-skill" agent skill from https://github.com/Formsmith746/SketchForge-3D/tree/main/docs/skills/sketchforge-mcp-skill into .opencode/skills/sketchforge-mcp-skill/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sketchforge-mcp-skill", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: sketchforge-mcp-skill
GitHub stars: 1.1k
Token cost: ~1.3k tokens
SKILL.md length: 587 words
Files: 2
Skills in repo: 1
Repo updated: Sep 18, 2026
First seen: Oct 7, 2026
Licence: AGPL-3.0

At a glance

Control a live local SketchForge editor through its MCP server.

Works in 3 steps: Start SketchForge from the repo → Open an editor tab at… → Configure your MCP client to start the…
Codex needs to list currently open SketchForge editor tabs
SKILL.md covers Quick Start, Client Compatibility, Targeting Editors and Core Workflow, plus 4 more sections
Calls npm and node

What it does

Sketchforge MCP Skill is an agent skill from Formsmith746/SketchForge-3D. Control a live local SketchForge editor through its MCP server. Use when Codex needs to list currently open SketchForge editor tabs, target a tab by editorNumber/projectName, read the current scene, list or select objects, create boxes/cubes/cylinders/sketch extrusions, update dimensions/position/rotation, align objects, group/ungroup/cut/separate parts, list exact CAD edge ids, apply chamfer/fillet to specific edges, inspect editor errors, or capture viewport images from view-cube angles.

Its SKILL.md is about 1.3k 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 Agent Workflows, covering MCP servers. It works with Model Context Protocol. The repository describes itself as: A local-first browser 3D design editor for building, cutting, importing STL files, and exporting models. The licence is AGPL-3.0.

When your agent uses it

Codex needs to list currently open SketchForge editor tabs
Target a tab by editorNumber/projectName
Read the current scene
Create boxes/cubes/cylinders/sketch extrusions

Example prompts

“/sketchforge-mcp-skill”

Requirements

Docker

Workflow steps

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

Start SketchForge from the repo
Open an editor tab at http://localhost:3000/?editor=1.
Configure your MCP client to start the stdio server

What it can do on your machine

Read from SKILL.md and the folder at commit e9cb8e8. 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
Shell commands in SKILL.md call:
- npm
- node
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use npm, which can reach the network depending on how they are called.
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

Sketchforge MCP Skill loads about 1.3k tokens when it runs. Until then it costs about 129 tokens; SKILL.md has 587 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~129
When it runs · the whole SKILL.md, loaded when a task matches: ~1.3k

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 Formsmith746/SketchForge-3D at commit e9cb8e8, republished under its AGPL-3.0 licence (© Formsmith746). 587 words, ~1,286 tokens.

Download SKILL.mdSave it as .claude/skills/sketchforge-mcp-skill/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.

name: sketchforge-mcp-skill
description: Control a live local SketchForge editor through its MCP server. Use when Codex needs to list currently open SketchForge editor tabs, target a tab by editorNumber/projectName, read the current scene, list or select objects, create boxes/cubes/cylinders/sketch extrusions, update dimensions/position/rotation, align objects, group/ungroup/cut/separate parts, list exact CAD edge ids, apply chamfer/fillet to specific edges, inspect editor errors, or capture viewport images from view-cube angles.

SketchForge MCP

Quick Start

Use this skill only with a local SketchForge app running in development mode.

Start SketchForge from the repo:

bash

npm run dev

Open an editor tab at http://localhost:3000/?editor=1.
Configure your MCP client to start the stdio server:

bash

node scripts/sketchforge-mcp-server.mjs

The MCP server talks to the app through /api/sketchforge-mcp. Open editor tabs heartbeat into that route and receive commands from it. Production and Docker/static builds intentionally return 404 for the MCP route.

Client Compatibility

Codex can use this folder as a skill and the MCP server as tools. Install the folder under ~/.codex/skills/sketchforge-mcp-skill and configure the MCP server in Codex.

Claude Desktop does not read Codex skills, but it can use the same scripts/sketchforge-mcp-server.mjs MCP server through Claude's mcpServers JSON config. Use the repository README for client setup examples.

Targeting Editors

Always call sketchforge_list_editors first when the user mentions multiple projects, tabs, or a number like 49536.

Use editorNumber for follow-up commands. It is a 5-digit per-tab number stored in browser sessionStorage, so two open SketchForge tabs have different numbers. The list also includes projectName, projectId, URL, shape count, selected count, notice, and last error.

If only one editor is open, commands may omit editorNumber; the server will target the sole live editor.

Core Workflow

Read scene/object state before modifying geometry:

text

sketchforge_list_editors
sketchforge_read_scene({ editorNumber })
sketchforge_list_objects({ editorNumber })

For object edits, use exact object id values from the scene. Do not invent object names; names are helpful labels only.

Useful tools:

sketchforge_select_objects: select ids in the live editor.
sketchforge_delete_objects: delete ids in the live editor, or delete the current selection when ids are omitted.
sketchforge_create_shape: create box, cube, cylinder, or sketch.
sketchforge_import_mesh: import STL-style mesh data into the editor.
sketchforge_update_object: set exact dimensions, position, color, name, hole state, and rotation/rotationX/rotationZ.
sketchforge_align_objects: align two or more ids using the same logic as the editor Alignment button.
sketchforge_group_objects: group selected ids using the normal SketchForge group/boolean path.
sketchforge_boolean_cut: pass solidIds and holeIds; the result replaces the operands.
sketchforge_ungroup_objects: restore grouped children while preserving edited child geometry.
sketchforge_separate_parts: split disconnected parts in one object.
sketchforge_inspect_errors: read the editor notice, edge modifier error, and last MCP error.

Show full SKILL.md (241 more words)Show less

Edge Features

Chamfer and fillet are separate edge-treatment operations in SketchForge. Do not fake a chamfer/fillet with cylinders or extra decorative geometry. Cylinders are only appropriate when the requested shape itself has a circular/rounded 2D footprint, such as rounded tray corners or a cylindrical peg.

For chamfer/fillet, never guess edge ids.

Call sketchforge_list_edges({ editorNumber, id, sharpAngle }).
Use returned selectableEdgeIds or inspect returned edge geometry.
Call sketchforge_apply_edge_treatment({ editorNumber, id, kind, edgeIds, amount, chamferAngle }).

edgeIds can be an array of numeric ids or "all". kind is chamfer or fillet. The app commits the result through normal history, so undo/redo works.

Images

Use sketchforge_capture_image for viewport PNGs. face can be current, home, top, bottom, front, back, right, or left. These use the same camera/view-cube orientation logic as the editor UI.

Visual Verification

After creating or heavily modifying an object, use vision when available. Capture at least one useful viewport image with sketchforge_capture_image; for 3D geometry, prefer home plus any needed orthographic-style faces such as top, front, or right. Inspect the rendered result against the user's requirements before saying the task is done.

Do not rely only on numeric scene data when the user asked for a physical object. Use numeric checks for dimensions and visual checks for whether the model reads correctly.

Safety

This bridge is local-development only. If a command fails, call sketchforge_inspect_errors before retrying. For geometry operations that can be expensive, set a larger timeoutMs on the tool call.

Files

SKILL.md and 1 other file in docs/skills/sketchforge-mcp-skill of Formsmith746/SketchForge-3D.

SKILL.md
agents/openai.yaml

Open the folder on GitHubat commit e9cb8e8

Compare with similar skills

Sketchforge MCP Skill 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.

Sketchforge MCP Skill compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Sketchforge MCP Skill this skillFormsmith746/SketchForge-3D	1.1k	—	~1.3k	Automated safety check: Pass	AGPL-3.0	21 days ago
MCP Server Builderanthropics/skills	180k	63 repos	~2.3k	Automated safety check: Pass	Apache-2.0	yesterday
MCP Server BuildershareAI-lab/learn-claude-code	78k	5 repos	~1.2k	Automated safety check: Pass	MIT	11 days ago
MCP Integration for Pluginsanthropics/claude-plugins-official	38k	11 repos	~3.1k	Automated safety check: Pass	Apache-2.0	yesterday
Crush Configurationcharmbracelet/crush	29k	—	~3.7k	Automated safety check: Pass	Custom licence	today
Context Mode Output Sandboxmksglu/context-mode	26k	—	~4.1k	Automated safety check: Pass	Custom licence	yesterday

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Works with

Model Context Protocol

Questions about Sketchforge MCP Skill

What does Sketchforge MCP Skill do?

Control a live local SketchForge editor through its MCP server. Sketchforge MCP Skill is an agent skill from Formsmith746/SketchForge-3D. Control a live local SketchForge editor through its MCP server.

When should I use Sketchforge MCP Skill?

Sketchforge MCP Skill fits situations like: Codex needs to list currently open SketchForge editor tabs; target a tab by editorNumber/projectName; read the current scene; create boxes/cubes/cylinders/sketch extrusions.

How do I install Sketchforge MCP Skill in Claude Code?

Run `npx skills add Formsmith746/SketchForge-3D --skill sketchforge-mcp-skill -a claude-code`. Or copy the skill folder (docs/skills/sketchforge-mcp-skill in Formsmith746/SketchForge-3D) into .claude/skills/sketchforge-mcp-skill in your project. Claude Code loads it when a task matches its description.

How do I install Sketchforge MCP Skill in Codex?

Run `npx skills add Formsmith746/SketchForge-3D --skill sketchforge-mcp-skill -a codex`. Or copy the skill folder (docs/skills/sketchforge-mcp-skill in Formsmith746/SketchForge-3D) into .agents/skills/sketchforge-mcp-skill in your project. Codex loads it when a task matches its description.

Can I use Sketchforge MCP Skill 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 Formsmith746/SketchForge-3D --skill sketchforge-mcp-skill -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/sketchforge-mcp-skill, .gemini/skills/sketchforge-mcp-skill, .github/skills/sketchforge-mcp-skill and .opencode/skills/sketchforge-mcp-skill in your project.

What does Sketchforge MCP Skill need to run?

Going by SKILL.md and its folder, Sketchforge MCP Skill needs the command-line tools its instructions call (npm and node). Our summary lists: Docker.

Does Sketchforge MCP Skill access the network?

SKILL.md contains no URLs. Its commands use npm, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Sketchforge MCP Skill 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 Sketchforge MCP Skill use?

Sketchforge MCP Skill is published under the AGPL-3.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Sketchforge MCP Skill use?

About 1.3k tokens (SKILL.md is roughly 5.1k 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 Sketchforge MCP Skill?

Skills that share tags, products or a category with Sketchforge MCP Skill: MCP Server Builder (anthropics/skills, 180k stars), MCP Server Builder (shareAI-lab/learn-claude-code, 78k stars), MCP Integration for Plugins (anthropics/claude-plugins-official, 38k stars) and Crush Configuration (charmbracelet/crush, 29k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Sketchforge MCP Skill?

Formsmith746 (a GitHub user) maintains it in Formsmith746/SketchForge-3D, which has 1,132 GitHub stars. The repository was last updated on September 18, 2026.

Source: Formsmith746/SketchForge-3D on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Sketchforge MCP Skill

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

SketchForge MCP

Quick Start

Client Compatibility

Targeting Editors

Core Workflow

Edge Features

Images

Visual Verification

Safety

Files

Compare with similar skills

Similar skills

MCP Server Builder

MCP Server Builder

MCP Integration for Plugins

Crush Configuration

Context Mode Output Sandbox

Warp GUI to Agent CLI Migration

Related

Questions about Sketchforge MCP Skill