Claude Code Skills Marketplace is a collection and marketplace of skills, plugins, agents, and instructions that extend Claude Code with specialized development workflows. It is for developers who want to install existing workflows or create, validate, and package their own Claude Code skills.
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 daymade/claude-code-skills --skill mermaid-toolsgit clone --depth 1 https://github.com/daymade/claude-code-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/daymade/claude-code-skills/mermaid-tools)<a href="https://agentmods.dev/skills/daymade/claude-code-skills/mermaid-tools"><img src="https://agentmods.dev/badge/skills/daymade/claude-code-skills/mermaid-tools/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/daymade/claude-code-skills/mermaid-tools"><img src="https://agentmods.dev/badge/skills/daymade/claude-code-skills/mermaid-tools.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- 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 | $0.00048 | $0.01235 |
| Opus 5.5 | $0.00019 | $0.00494 |
| Sonnet 5.5 | $0.00010 | $0.00247 |
| Haiku 4.5 | $0.00005 | $0.00123 |
Grade A, and why
mermaid-tools scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
Copies of this mod
2 near-identical copies found in the catalogue:
- mermaid-tools — 100% identical, 18 lines differ
- mermaid-tools — 98% identical, 29 lines differ
How it starts
The opening of the file, as written. The whole thing — 166 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Mermaid Tools
Overview
This skill enables extraction of Mermaid diagrams from markdown files and generation of high-quality PNG images. The skill bundles all necessary scripts (extract-and-generate.sh, extract_diagrams.py, and puppeteer-config.json) in the scripts/ directory for portability and reliability.
Core Workflow
Standard Diagram Extraction and Generation
Extract Mermaid diagrams from a markdown file and generate PNG images using the bundled extract-and-generate.sh script:
cd "${CLAUDE_SKILL_DIR}/scripts"
./extract-and-generate.sh "<markdown_file>" "<output_directory>"
Parameters:
<markdown_file>: Path to the markdown file containing Mermaid diagrams<output_directory>: (Optional) Directory for output files. Defaults to<markdown_file_directory>/diagrams
Example:
cd "${CLAUDE_SKILL_DIR}/scripts"
./extract-and-generate.sh "<markdown_file>" "<output_directory>"
What the Script Does
- Extracts all Mermaid code blocks from the markdown file
- Numbers them sequentially (01, 02, 03, etc.) in order of appearance
- Generates
.mmdfiles for each diagram - Creates high-resolution PNG images with smart sizing
- Validates all generated PNG files
Output Files
For each diagram, the script generates:
01-diagram-name.mmd- Extracted Mermaid code01-diagram-name.png- High-resolution PNG image
The numbering ensures diagrams maintain their order from the source document.
Advanced Usage
Custom Dimensions and Scaling
Override default dimensions using environment variables:
cd "${CLAUDE_SKILL_DIR}/scripts"
MERMAID_WIDTH=1600 MERMAID_HEIGHT=1200 ./extract-and-generate.sh "<markdown_file>" "<output_directory>"
Available variables:
MERMAID_WIDTH(default: 1200) - Base width in pixelsMERMAID_HEIGHT(default: 800) - Base height in pixelsMERMAID_SCALE(default: 2) - Scale factor for high-resolution output
High-Resolution Output for Presentations
What ships with it
4 files 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 Changed · +1 lines eda57bd623be
- 1mo ago First seen · 165 lines · 48 tokens per session scan A 7f390eef2337
mermaid-tools is a skill published in the GitHub repository daymade/claude-code-skills (1,496 stars, last pushed today), licensed MIT. It adds 48 tokens to every session and 1,235 once invoked, about $0.0002 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 2026-08-30.
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