What is coding mermaid.instructions.md?

A set of instructions for creating, editing, checking, and previewing Mermaid diagrams in Visual Studio Code. Mermaid is a text format that turns simple code into diagrams.

Creating flowcharts and other Mermaid diagrams, writing them to .mmd files, checking their syntax, and opening previews in Visual Studio Code.

It helps keep diagram code valid and makes it easier to see the result while working. It also gives a defined workflow for saving and checking diagram files.

coding mermaid.instructions.md — Instructions file by fwornle

Install

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.

agentmods

npx agentmods add instructions/fwornle/coding/mermaid

Clone the repo

git clone --depth 1 https://github.com/fwornle/coding

Made for: GitHub Copilot.

Per session 970 This file is loaded in full into every session.

When invoked 970 The same file — it is already loaded in full.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00970	$0.00970
Opus 5	$0.00485	$0.00485
Sonnet 5	$0.00194	$0.00194
Haiku 4.5	$0.00097	$0.00097

Measured yesterday against content hash 6a91984bb661, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

coding mermaid.instructions.md 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 yesterday.

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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

gitea-mcp mermaid.instructions.md — 100% identical, 0 lines differ

.github/instructions/mermaid.instructions.md · 86 lines

How it starts

The opening of the file, as written. The whole thing — 86 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Mermaid AI Skills

When the user asks to create, edit, or visualize any diagram, use the Mermaid VS Code extension tools and commands described below.

Workflow

Determine the diagram type and generate Mermaid syntax.
Write the diagram to a .mmd file in the project.
Validate syntax: correct first-line keyword, arrow types, balanced brackets.
Preview via the Mermaid extension — open the .mmd file (auto-preview) or run MermaidChart: Preview Diagram (mermaidChart.preview).

LM Tools — call these for every diagram interaction

mermaid-diagram-validator — validate Mermaid syntax before presenting any diagram
mermaid-diagram-preview — render a live preview inside VS Code after generating
get-syntax-docs-mermaid — fetch correct syntax docs for any diagram type

VS Code Commands

Invoke via Command Palette or the VS Code command API (GitHub Copilot in VS Code only). Do not invent command IDs. Prefer writing/editing .mmd files when a command is not needed.

Diagram editing & preview

Preview (mermaidChart.preview) — preview the active Mermaid editor (.mmd / .mermaid must be open).
Create Diagram (mermaidChart.createMermaidFile) — creates a demo flowchart and opens preview side by side.
Repair Diagram (mermaidChart.repairDiagram) — Mermaid AI repair for the active diagram; uses Mermaid AI credits — tell the user before running.
Improve Diagram (mermaidChart.improveDiagram) — uses Copilot / LM API; suggests layout + styling variants for the active diagram.

Generate diagrams (GitHub Copilot required)

Generate Diagram from Code (mermaidChart.generateDiagramFromCode)
Generate Cloud Diagram (mermaidChart.generateCloudDiagram)
Generate ER Diagram (mermaidChart.generateERDiagram)
Generate Docker Diagram (mermaidChart.generateDockerDiagram)
Open AI Chat (mermaidChart.openCopilotChat)

Mermaid Chart cloud

Login (mermaidChart.login) / Logout (mermaidChart.logout)
Connect Diagram (mermaidChart.connectDiagramToMermaidChart) — link a local diagram to Mermaid Chart.
Sync Diagram (mermaidChart.syncDiagramWithMermaid) — only for diagrams already connected (frontmatter has id:). Example:
```
---
id: cbd9e9ba-a2cb-47c5-a98e-8c28a753428d
---
```

Read the full file on GitHub · 86 lines

Changes

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.

yesterday First seen · 86 lines · 970 tokens per session scan A 6a91984bb661

Subscribe to this mod's changes

coding mermaid.instructions.md is an instructions file published in the GitHub repository fwornle/coding (2 stars, last pushed yesterday), licensed MIT. It adds 970 tokens to every session, about $0.0049 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 2026-08-31.

Productivity Writing and docs

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AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.

openai/codex · 5,182 tokens

buildNext

Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).

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coding mermaid.instructions.md