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 glebis/claude-skills --skill sketchgit clone --depth 1 https://github.com/glebis/claude-skillsWrote 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/glebis/claude-skills/sketch)<a href="https://agentmods.dev/skills/glebis/claude-skills/sketch"><img src="https://agentmods.dev/badge/skills/glebis/claude-skills/sketch/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/glebis/claude-skills/sketch"><img src="https://agentmods.dev/badge/skills/glebis/claude-skills/sketch.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00082 | $0.01150 |
| Opus 5.5 | $0.00033 | $0.00460 |
| Sonnet 5.5 | $0.00016 | $0.00230 |
| Haiku 4.5 | $0.00008 | $0.00115 |
Grade A, and why
sketch 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 1mo 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 — 77 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Sketch - Collaborative SVG Canvas
Description
Opens a Fabric.js-based SVG editor in the browser for collaborative visual prototyping. Codex can write and read SVG through MCP tools while the user edits interactively. Changes sync in real-time via WebSocket.
Preflight
If the editor shows "disconnected" or WebSocket errors occur, stale server processes may be blocking. Run this before retrying:
pkill -f 'sketch-mcp-server/dist/index.js'
Then reconnect the MCP server (the next tool call will restart it). The server now auto-kills stale instances on startup, but orphaned processes from before this fix may still linger.
Tools Available (via sketch-mcp-server)
sketch_open_canvas- Open a named canvas (creates if new), launches browser editorsketch_get_svg- Read current SVG from a canvassketch_set_svg- Replace entire canvas with new SVGsketch_add_element- Add SVG elements without clearing existing contentsketch_add_textbox- Add a fixed-width text area (Textbox) with word wrappingsketch_lock_objects- Lock all current objects (non-selectable, non-movable)sketch_unlock_objects- Unlock all objectssketch_save_template- Save canvas as reusable JSON template (preserves Textbox widths + lock state)sketch_load_template- Load a saved JSON template into a canvassketch_list_templates- List all saved templatessketch_set_zoom- Set zoom level (1.0 = 100%), optionally zoom toward a specific pointsketch_pan_to- Pan the viewport so (x, y) is at the top-leftsketch_zoom_to_fit- Fit all content in view with padding (call after drawing)sketch_capture_screenshot- Capture a PNG screenshot of the canvas (returns image for visual verification)sketch_clear_canvas- Clear canvas to blank state (use before streaming)sketch_focus_canvas- Bring canvas window to foregroundsketch_list_canvases- List all active canvasessketch_close_canvas- Close a canvas and its browser tab
Usage Patterns
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 1mo ago First seen · 77 lines · 82 tokens per session scan A 7a7451873813
sketch is a skill published in the GitHub repository glebis/claude-skills (393 stars, last pushed yesterday), licensed MIT. It adds 82 tokens to every session and 1,150 once invoked, about $0.0003 per session on Opus 5.5. 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 2026-09-03.
Other skills, from other repositories
webgl-holographic-foil
A self-contained WebGL2 hero: thin-film interference over a crushed-foil surface whose palette shifts with the viewing angle; move the cursor to tilt the film.
html-ppt-hermes-cyber-terminal
OpenDesign + BYOK: choosing and wiring your own model, hands-on — cost, quality, and the routing decision. Built as a decision-grade AI literacy deck for engineers, IT, applied-AI teams.
html-ppt-taste-brutalist
16:9 HTML deck in tactical-telemetry / CRT-terminal taste. Deactivated-CRT charcoal slides, white-phosphor monospace, hazard-red accent, scanline overlay, ASCII syntax, density over decoration. Distilled from Leonxlnx/taste-skill brutalist-skill (Tactical Telemetry mode).
visual-ralph
Visual Ralph orchestration for frontend UI from generated references, static references, or live URL targets, using $ultragoal with built-in visual verdict and pixel-diff evidence until the implementation matches and leaves a reproducible design system.
glance-canonical-layouts
Use this skill to create home screen widgets using Jetpack Glance Canonical Layouts from the Android Platform Samples project, or when asked to implement standard widget layout patterns (including Check List, Image Grid, Snap Scrolling, and Standard Toolbar).
accessibility
Consolidated accessibility skill entrypoint for WCAG 2.2, ARIA Authoring Practices, cognitive accessibility, Section 508, EN 301 549, design intent verification, and the Accessibility Planner workflow.