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agentic-mermaid: Instructions file for Claude Code

CLAUDE.md

agentic-mermaid CLAUDE.md is an instructions file for Claude Code from adewale/agentic-mermaid. It costs 2,488 tokens per session, scanned A, original, from a forked repository, MIT.

Repository guidance for AI coding agents working on Agentic Mermaid, a tool that renders Mermaid diagrams as SVG, PNG, ASCII, or Unicode and supports typed editing. It documents the project structure, commands, testing, and pull requests.

In plain words
What is it for?
Use it when installing dependencies, running tests or type checks, tracking layout quality, rendering diagrams, building the website, or preparing pull requests.
Why use it?
It gives an agent the project-specific rules and checks needed to make safe changes and reproduce test failures.

Instructions file for Claude Code

Written for Claude Code: SessionStart hook event. Also seen: mentions CLAUDE.md.

This is adewale/agentic-mermaid's own configuration. It tells Claude Code how to work on agentic-mermaid itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything agentic-mermaid configures →

not rated 69repo +2 changed yesterday A scan 2,488 tokens fork MIT
View source ↗ adewale/agentic-mermaid agentic-mermaid.dev
Reuse

Borrowing it

Nothing to install: this file belongs to adewale/agentic-mermaid. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/adewale/agentic-mermaid/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/adewale/agentic-mermaid

Made for: Claude Code.

Wrote 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.

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README.md
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Your own site
<a href="https://agentmods.dev/instructions/adewale/agentic-mermaid/claude-md"><img src="https://agentmods.dev/badge/instructions/adewale/agentic-mermaid/claude-md/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.

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<a href="https://agentmods.dev/instructions/adewale/agentic-mermaid/claude-md"><img src="https://agentmods.dev/badge/instructions/adewale/agentic-mermaid/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 2,488 This file is loaded in full into every session.
When invoked 2,488 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin fork From a forked repository.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.02488 $0.02488
Opus 5.5 $0.00995 $0.00995
Sonnet 5.5 $0.00498 $0.00498
Haiku 4.5 $0.00249 $0.00249

Measured yesterday against content hash e0daab701b4c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

agentic-mermaid CLAUDE.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.

CLAUDE.md · 195 lines

How it starts

The opening of the file, as written. The whole thing — 195 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

Guidance for AI agents working in this repository.

Project

Agentic Mermaid (agentic-mermaid on npm) — a fork of lukilabs/beautiful-mermaid that renders Mermaid diagrams to SVG/PNG/ASCII/Unicode with a typed, agent-native editing surface. Source lives in src/; the layout pipeline is in src/layout-engine.ts, the deterministic layout-quality rubric in src/layout-rubric.ts.

Commands

  • bun install — install dependencies. Requires Bun 1.4.0 or later (CI pins 1.4.2); older Bun mishandles node:vm timeouts and the MCP server refuses to start. In cloud sessions the SessionStart hook (scripts/ci/session-start.sh) upgrades an older Bun and runs bun install for you, in the background: if bun --version is still below 1.4.0 right after a session starts, wait a few seconds.
  • bun run test — run the full unit suite with the canonical timeout (the CI gate). bun run test:coverage adds the weekly/on-demand coverage diagnostic. fast-check seeds are pinned by a preload; AM_FC_SEED=<int> reproduces a roll, AM_FC_SEED=random is finder mode (see docs/testing-strategy.md §4).
  • bun run typecheck — canonical typecheck across core and repository surfaces.
  • bun run track — heuristic layout-quality tracker (improvements/regressions vs baseline).
  • bun run reference:mermaid — clone the pinned Mermaid source to ../mermaid and install the matching reference in ../mermaid-reference (idempotent); bun run test:mermaid-modern needs both.
  • bun run bin/am.ts render <file> --format png --output out.png — render a diagram.
  • bun run website — build the Cloudflare Workers site into website/public/, a gitignored build artifact (rebuilt at deploy by deploy-cloudflare.yml, and on-demand by explicit imports of src/__tests__/website-public-fixture.ts). You do not commit it. website/src/generated/ is also ephemeral. website:check performs an in-memory clean regeneration and contract comparison for both trees; run bun run website only when local serving, deployment, or an explicit fixture consumer needs materialized outputs.

Read the full file on GitHub · 195 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.

  1. yesterday Changed · +22 lines · +279 tokens per session e0daab701b4c
  2. 5d ago Changed · +1 lines · +15 tokens per session 227118b8e269
  3. 6d ago Changed · +5 lines · +72 tokens per session c0a06f71faf4
  4. 7d ago Changed · +9 lines · +141 tokens per session 5cc74689d09a
  5. 8d ago Changed · +22 lines · +263 tokens per session 34db5610882e
  6. 24d ago Changed · +1 lines · +30 tokens per session d0de5697c378
  7. 25d ago Changed · +60 lines · +706 tokens per session 70075a83968b
  8. 27d ago Changed · +7 lines · +120 tokens per session f1bb89a40cc3
  9. 29d ago Changed · +4 lines · +104 tokens per session 305aa99b6e89
  10. 1mo ago First seen · 64 lines · 758 tokens per session scan A 0a48a59ca7c8

Subscribe to this mod's changes

agentic-mermaid CLAUDE.md is an instructions file published in the GitHub repository adewale/agentic-mermaid (69 stars, last pushed today), licensed MIT. It adds 2,488 tokens to every session, about $0.0100 per session on Opus 5.5. A static security scan graded it A with 0 findings. It comes from a forked repository.

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