Borrowing it
Nothing to install: this file belongs to doncheli/don-cheli-sdd. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/doncheli/don-cheli-sdd/main/.agent/skills/doncheli-diagram/SKILL.mdgit clone --depth 1 https://github.com/doncheli/don-cheli-sddWrote 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/doncheli/don-cheli-sdd/doncheli-diagram)<a href="https://agentmods.dev/skills/doncheli/don-cheli-sdd/doncheli-diagram"><img src="https://agentmods.dev/badge/skills/doncheli/don-cheli-sdd/doncheli-diagram/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/doncheli/don-cheli-sdd/doncheli-diagram"><img src="https://agentmods.dev/badge/skills/doncheli/don-cheli-sdd/doncheli-diagram.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 | $0.00058 | $0.00408 |
| Opus 5 | $0.00029 | $0.00204 |
| Sonnet 5 | $0.00012 | $0.00082 |
| Haiku 4.5 | $0.00006 | $0.00041 |
Grade A, and why
doncheli-diagram 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 11d 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.
What it actually says
Don Cheli: Diagram Generator
Instructions
- Determine the diagram type from the request or flag: class, sequence, architecture, erd, flowchart
- Identify the scope: specific file, module, feature, or full project
- Analyze the relevant source files:
- class: parse class/interface definitions, inheritance, and composition
- sequence: trace function calls, async flows, and inter-module communication
- architecture: identify top-level modules, external services, and data flows (C4 Context/Container)
- erd: parse ORM models, entity fields, and relationships
- flowchart: follow conditional logic for a specific feature or endpoint
- Build the Mermaid diagram — validate syntax mentally before outputting
- Keep diagrams readable: maximum 20 nodes, split into subdiagrams if larger
- Never invent relationships not present in the code
- Add a generation timestamp as a Mermaid comment
- Offer to embed the diagram in the target file (README, spec doc, ADR)
Supported Outputs
- Inline Mermaid code blocks (default) — renders in GitHub, GitLab, Notion
- C4 PlantUML (with
--format c4) for advanced architecture docs - Save to file with
--output <path>
Quality Gate
- If the analyzed scope yields fewer than 3 nodes, warn the user the diagram may not be useful
- If source files are not readable (permissions, binary), skip and report which files were skipped
- Do not use this skill to generate diagrams from memory — always analyze actual source files
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.
- 11d ago First seen · 35 lines · 58 tokens per session scan A 17f83e20c71c
doncheli-diagram is a skill published in the GitHub repository doncheli/don-cheli-sdd (57 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 58 tokens to every session and 408 once invoked, about $0.0003 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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