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 amanning3390/hermeshub --skill diagram-makergit clone --depth 1 https://github.com/amanning3390/hermeshubWrote 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/amanning3390/hermeshub/diagram-maker)<a href="https://agentmods.dev/skills/amanning3390/hermeshub/diagram-maker"><img src="https://agentmods.dev/badge/skills/amanning3390/hermeshub/diagram-maker/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/amanning3390/hermeshub/diagram-maker"><img src="https://agentmods.dev/badge/skills/amanning3390/hermeshub/diagram-maker.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 | $0.00056 | $0.02760 |
| Opus 5.5 | $0.00022 | $0.01104 |
| Sonnet 5.5 | $0.00011 | $0.00552 |
| Haiku 4.5 | $0.00006 | $0.00276 |
Grade A, and why
diagram-maker 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 — 340 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Diagram Maker
Generate production-ready Mermaid diagrams that render on the first try.
When to Use
- User asks for a diagram, flowchart, or visual representation
- User wants to document architecture, workflows, or processes
- User needs sequence diagrams for API interactions
- User asks for ER diagrams, class diagrams, or state machines
- User wants Gantt charts, pie charts, or timeline diagrams
- User has a broken Mermaid diagram that needs fixing
Why This Exists
LLMs frequently produce Mermaid diagrams that fail to parse. The most common failures are:
- Unquoted labels with special characters (parentheses, commas, arrows)
- HTML tags in node text (
<br/>outside quotes,<b>tags) - Reserved word collisions (
end,graph,styleused as node IDs) - Mismatched brackets —
[],(),{}not properly paired - Invalid arrow syntax — mixing up
-->,==>,-.->,--> - Subgraph nesting errors — missing
endkeywords or improper direction - Semicolons and whitespace — trailing semicolons that break parsers
- Overly complex single diagrams — 50+ nodes that become unreadable
This skill eliminates these failures with strict syntax rules.
Procedure
- Identify the diagram type from the user's request (see Type Selection below)
- Plan the structure — list nodes and relationships before writing syntax
- Write the diagram following the Syntax Rules below
- Self-validate — check every node label, arrow, and bracket
- Output the diagram in a fenced
mermaidcode block - If the diagram exceeds 30 nodes, split into multiple focused diagrams
Type Selection
| User Intent | Diagram Type | Declaration |
|---|---|---|
| Process, workflow, decision tree | Flowchart | flowchart TD or flowchart LR |
| API calls, request/response | Sequence | sequenceDiagram |
| Object relationships, inheritance | Class | classDiagram |
| Database tables, relationships | ER | erDiagram |
| State transitions, lifecycles | State | stateDiagram-v2 |
| Project timeline, milestones | Gantt | gantt |
| Proportions, percentages | Pie | pie |
| Git branching | Git Graph | gitGraph |
| User journey | Journey | journey |
| System context | C4 | C4Context |
| Nested hierarchy | Mindmap | mindmap |
| Release timeline | Timeline | timeline |
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 · 340 lines · 56 tokens per session scan A 99c05d9b4853
diagram-maker is a skill published in the GitHub repository amanning3390/hermeshub (48 stars, last pushed 3mo ago), licensed MIT. It adds 56 tokens to every session and 2,760 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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