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 gabelul/stitch-kit --skill stitch-mcp-update-design-systemgit clone --depth 1 https://github.com/gabelul/stitch-kitWrote 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/gabelul/stitch-kit/stitch-mcp-update-design-system)<a href="https://agentmods.dev/skills/gabelul/stitch-kit/stitch-mcp-update-design-system"><img src="https://agentmods.dev/badge/skills/gabelul/stitch-kit/stitch-mcp-update-design-system/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/gabelul/stitch-kit/stitch-mcp-update-design-system"><img src="https://agentmods.dev/badge/skills/gabelul/stitch-kit/stitch-mcp-update-design-system.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 | $0.00032 | $0.00771 |
| Opus 5 | $0.00016 | $0.00385 |
| Sonnet 5 | $0.00006 | $0.00154 |
| Haiku 4.5 | $0.00003 | $0.00077 |
Grade A, and why
stitch-mcp-update-design-system 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 — 88 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Stitch MCP — Update Design System
Updates an existing Stitch Design System. Use this to modify theme properties, design tokens, or style guidelines without creating a new design system.
Critical prerequisite
Only use this skill when the user explicitly mentions "Stitch".
You must have the design system's asset name before calling this. If you don't have one:
- List existing design systems via
stitch-mcp-list-design-systems - Or use the
namereturned fromstitch-mcp-create-design-system
When to use
- User wants to modify colors, fonts, or roundness of an existing design system
- After reviewing a design system and wanting to adjust specific properties
- Updating design tokens after a brand refresh
Call the MCP tool
{
"name": "update_design_system",
"arguments": {
"name": "assets/15996705518239280238",
"projectId": "3780309359108792857",
"designSystem": {
"displayName": "SaaS Dashboard Theme v2",
"theme": {
"colorMode": "DARK",
"headlineFont": "GEIST",
"bodyFont": "GEIST",
"labelFont": "GEIST",
"roundness": "ROUND_TWELVE",
"customColor": "#818CF8"
}
}
}
}
Parameter reference
Three sibling top-level arguments — name is not nested inside designSystem:
| Argument | Type | Required | Description |
|---|---|---|---|
name |
string | Yes | Asset identifier with the assets/ prefix, e.g. assets/15996705518239280238. Top-level, not inside designSystem. |
projectId |
string | Yes | Bare numeric project id, no projects/ prefix |
designSystem |
object | Yes | {displayName, theme} — see below |
designSystem — {displayName, theme} only
| Field | Type | Required | Description |
|---|---|---|---|
displayName |
string | Yes | Human-readable name |
theme |
DesignTheme | Yes | Visual configuration (see stitch-mcp-create-design-system for the full field reference) |
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 · 88 lines · 32 tokens per session scan A b45442b49337
stitch-mcp-update-design-system is a skill published in the GitHub repository gabelul/stitch-kit (44 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 32 tokens to every session and 771 once invoked, about $0.0002 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 2026-08-30.
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