project-diagrams

project-diagrams is a skill for Claude Code from flight505/claude-project-planner. It costs 41 tokens per session (3,544 once invoked), scanned A, original, no licence file.

A skill for creating software architecture diagrams, including C4 diagrams, data-flow diagrams, sequence diagrams, and other design visualisations. C4 diagrams describe a system at several levels, from its overall structure to its code components.

In plain words
What is it for?
For documenting system architecture, showing how data moves, describing interactions between components, and visualising software designs with Nano Banana Pro AI or Mermaid.
Why use it?
It helps turn software-design ideas into diagrams that can be used during planning and communication.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Part of the claude-project-planner plugin — 20 skills, 6 commands, 1 agent, 2 hooks shipped together

Good fit For documenting system architecture, showing how data moves, describing interactions between components, and visualising software designs with Nano Banana Pro AI or Mermaid.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/flight505/claude-project-planner/project-diagrams
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.

Any agent
npx skills add flight505/claude-project-planner --skill project-diagrams
Clone the repo
git clone --depth 1 https://github.com/flight505/claude-project-planner

Made for: Claude Code.

Or install claude-project-planner, the plugin that ships this one along with the rest of its 20 skills, 6 commands, 1 agent, 2 hooks.

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.

agentmods badge for project-diagrams

README.md
[![agentmods](https://agentmods.dev/badge/skills/flight505/claude-project-planner/project-diagrams/github.svg)](https://agentmods.dev/skills/flight505/claude-project-planner/project-diagrams)
Your own site
<a href="https://agentmods.dev/skills/flight505/claude-project-planner/project-diagrams"><img src="https://agentmods.dev/badge/skills/flight505/claude-project-planner/project-diagrams/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.

agentmods 80×15 button for project-diagrams

Your own site · 80×15
<a href="https://agentmods.dev/skills/flight505/claude-project-planner/project-diagrams"><img src="https://agentmods.dev/badge/skills/flight505/claude-project-planner/project-diagrams.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 41 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,544 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00041 $0.03544
Opus 5 $0.00020 $0.01772
Sonnet 5 $0.00008 $0.00709
Haiku 4.5 $0.00004 $0.00354

Measured 10d ago against content hash dcd9d75cb1d4, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

project-diagrams 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 10d ago.

The scan reads SKILL.md. This mod also ships 5 executable files (example_usage.sh, scripts/generate_schematic_ai.py, scripts/generate_schematic.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

project_planner/.claude/skills/project-diagrams/SKILL.md · 498 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

Files

What ships with it

8 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.

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. 10d ago First seen · 498 lines · 41 tokens per session scan A dcd9d75cb1d4

Subscribe to this mod's changes

project-diagrams is a skill published in the GitHub repository flight505/claude-project-planner (4 stars, last pushed 5mo ago), with no licence file. It adds 41 tokens to every session and 3,544 once invoked, about $0.0002 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.

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