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Agent skill

Foundation Models

by gustavscirulis in gustavscirulis/snapgrid

On-device LLM integration using Apple's Foundation Models framework.

Custom licenceAuto-check: notesAI & LLM Engineering

Install Foundation Models

skills CLI
$ npx skills add gustavscirulis/snapgrid --skill foundation-models -a claude-code

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

GitHub CLI
$ gh skill install gustavscirulis/snapgrid foundation-models --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/gustavscirulis/snapgrid.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/skills/apple-intelligence/foundation-models .claude/skills/foundation-models && 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
foundation-models
GitHub stars
117
Used in
1 other repo
Token cost
~4.1k tokens
SKILL.md length
526 words
Files
1
Skills in repo
118
Repo updated
First seen
Licence
Custom licence

At a glance

On-device LLM integration using Apple's Foundation Models framework.

  • Works in 3 steps: Check Availability → Create a Session → Generate Response
  • Implementing AI text generation
  • SKILL.md covers When to Use, Quick Start, Prompt Engineering Best… and Structured Output with…, plus 5 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Foundation Models is an agent skill from gustavscirulis/snapgrid. On-device LLM integration using Apple's Foundation Models framework. Use when implementing AI text generation, structured output, or tool calling.

Its SKILL.md is about 4.1k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in AI & LLM Engineering, covering Structured output and tool calling. The repository describes itself as: SnapGrid is an open-source Mac app for collecting, organizing, and analyzing UI screenshots. It uses AI to automatically detect UI components and patterns, making it a powerful…

When your agent uses it

  • Implementing AI text generation
  • Structured output

Example prompts

  • “/foundation-models”

Requirements

  • Pre-approved tools (allowed-tools): Read, Write, Edit, Glob, Grep, Bash, AskUserQuestion

Workflow steps

3 steps, taken from the step headings in SKILL.md.

  1. Check Availability
  2. Create a Session
  3. Generate Response

What it can do on your machine

Read from SKILL.md and the folder at commit eb7eaf4. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves these tools, so the agent can use them without asking each time:

    • Read
    • Write
    • Edit
    • Glob
    • Grep
    • Bash
    • AskUserQuestion

    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 swift).

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

  • Network

    Links to these hosts (documentation or services it may open):

    • developer.apple.com
    • artemnovichkov.com

    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

Foundation Models loads about 4.1k tokens when it runs. Until then it costs about 41 tokens; SKILL.md has 526 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~41
When it runs · the whole SKILL.md, loaded when a task matches
~4.1k

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: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

  • NotePre-approves every shell command (allowed-tools: Bash)SKILL.md
    allowed-tools: Read, Write, Edit, Glob, Grep, Bash, AskUserQuestion

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

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 526 words (~4,071 tokens).

“Integrate Apple's on-device LLM into your apps for privacy-preserving AI features.”

— opening of SKILL.md by gustavscirulis, Custom licence
name
foundation-models
allowed-tools
Read, Write, Edit, Glob, Grep, Bash, AskUserQuestion

Read the full SKILL.md on GitHub

Files

Just SKILL.md in .claude/skills/skills/apple-intelligence/foundation-models of gustavscirulis/snapgrid.

Open the folder on GitHubat commit eb7eaf4

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in gustavscirulis/snapgrid, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Foundation Models 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.

Foundation Models compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Foundation Models this skillgustavscirulis/snapgrid1171 repos~4.1kAutomated safety check: NotesCustom licence
Planning With Filesjarrodwatts/claude-code-config1.1k5 repos~967Automated safety check: PassNone
Tool Use Data Synthesissunny-glow/Auto-BenchMax1.3k—~3.3kAutomated safety check: PassNone
Agent Harness ConstructionKartikLabhshetwar/mind-mentor1486 repos~500Automated safety check: PassApache-2.0
Prompt Engineering Patternswshobson/agents40k—~1.3kAutomated safety check: PassMIT
Model Benchmarkstheopenco/llmgateway1.7k—~1.1kAutomated safety check: NotesCustom licence

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Categories

Questions about Foundation Models

What does Foundation Models do?

On-device LLM integration using Apple's Foundation Models framework. Foundation Models is an agent skill from gustavscirulis/snapgrid. On-device LLM integration using Apple's Foundation Models framework.

When should I use Foundation Models?

Foundation Models fits situations like: implementing AI text generation; structured output.

How do I install Foundation Models in Claude Code?

Run `npx skills add gustavscirulis/snapgrid --skill foundation-models -a claude-code`. Or copy the skill folder (.claude/skills/skills/apple-intelligence/foundation-models in gustavscirulis/snapgrid) into .claude/skills/foundation-models in your project. Claude Code loads it when a task matches its description.

How do I install Foundation Models in Codex?

Run `npx skills add gustavscirulis/snapgrid --skill foundation-models -a codex`. Or copy the skill folder (.claude/skills/skills/apple-intelligence/foundation-models in gustavscirulis/snapgrid) into .agents/skills/foundation-models in your project. Codex loads it when a task matches its description.

Can I use Foundation Models 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 gustavscirulis/snapgrid --skill foundation-models -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/foundation-models, .gemini/skills/foundation-models, .github/skills/foundation-models and .opencode/skills/foundation-models in your project.

What does Foundation Models need to run?

SKILL.md names no scripts, command-line tools or credentials: Foundation Models is instructions for the agent only. Its frontmatter pre-approves these tools: Read, Write, Edit, Glob, Grep, Bash, AskUserQuestion.

Does Foundation Models access the network?

SKILL.md names 2 domains. As links in the text: developer.apple.com and artemnovichkov.com. This is read from the text; nothing was executed.

Is Foundation Models safe to install?

Our automated static check of SKILL.md found notes only (pre-approves every shell command (allowed-tools: bash)), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.

What licence does Foundation Models use?

Foundation Models has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Foundation Models use?

About 4.1k tokens (SKILL.md is roughly 16k 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 Foundation Models?

Skills that share tags, products or a category with Foundation Models: Planning With Files (jarrodwatts/claude-code-config, 1.1k stars), Tool Use Data Synthesis (sunny-glow/Auto-BenchMax, 1.3k stars), Agent Harness Construction (KartikLabhshetwar/mind-mentor, 148 stars) and Prompt Engineering Patterns (wshobson/agents, 40k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Foundation Models?

gustavscirulis (a GitHub user) maintains it in gustavscirulis/snapgrid, which has 117 GitHub stars. The repository holds 118 skills in this directory. The repository was last updated on April 30, 2026.

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