What is lucid-diagram-code?

A tool for creating and updating editable Lucid diagrams from code, repositories, API definitions, or system descriptions. Lucid diagrams are visual documents used to explain software structure and flows.

It helps show call traces, map dependencies, explain system interactions, and create UML class diagrams. UML is a standard way to draw software structures and relationships.

It turns complex code interactions, dependencies, and execution paths into diagrams that are easier to inspect and discuss.

lucid-diagram-code — Skill for Claude Code by lucidsoftware

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 lucidsoftware/lucid-mcp-server --skill lucid-diagram-code

Clone the repo

git clone --depth 1 https://github.com/lucidsoftware/lucid-mcp-server

Made for: Claude Code.

Or install lucid, the plugin that ships this one along with the rest of its 8 skills, 1 MCP server.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/lucidsoftware/lucid-mcp-server/lucid-diagram-code/github.svg)](https://agentmods.dev/skills/lucidsoftware/lucid-mcp-server/lucid-diagram-code)

Your own site

<a href="https://agentmods.dev/skills/lucidsoftware/lucid-mcp-server/lucid-diagram-code"><img src="https://agentmods.dev/badge/skills/lucidsoftware/lucid-mcp-server/lucid-diagram-code/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/lucidsoftware/lucid-mcp-server/lucid-diagram-code"><img src="https://agentmods.dev/badge/skills/lucidsoftware/lucid-mcp-server/lucid-diagram-code.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 173 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 7,475 The whole file, excluding the scripts and references it only reads on demand.

Security scan B 1 finding. 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.

Model	Per session	Once invoked
Fable 5.1	$0.00173	$0.07475
Opus 5.5	$0.00069	$0.02990
Sonnet 5.5	$0.00035	$0.01495
Haiku 4.5	$0.00017	$0.00747

Measured 6d ago against content hash 386d392f1fd3, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

lucid-diagram-code scanned grade B with 1 finding 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 6d 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.

Strips warnings and disclaimersmediumAnti-refusal

Omitting safety caveats hides risk from the user and is a common jailbreak preamble.

- **Paraphrased names:** label classes and components with the name used in the code (`OrderService`). Do not add caveats such as "(file not stated)" to a label.

claude/skills/lucid-diagram-code/SKILL.md · 288 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

4 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.

6d ago First seen · 288 lines · 173 tokens per session scan B 386d392f1fd3

Subscribe to this mod's changes

lucid-diagram-code is a skill published in the GitHub repository lucidsoftware/lucid-mcp-server (4 stars, last pushed 2d ago), with no licence file. It adds 173 tokens to every session and 7,475 once invoked, about $0.0007 per session on Opus 5.5. A static security scan graded it B with 1 finding (strips warnings and disclaimers). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-10-31.

Design and UX

lucid-diagram-code next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
lucid-diagram-codelucidsoftware/lucid-mcp-server	Skill	4	2d ago	none	B	173	Claude Code
webgl-holographic-foilnexu-io/open-design	Skill	106k	yesterday	Apache-2.0	A	41	Claude Code, Codex
html-ppt-hermes-cyber-terminalnexu-io/open-design	Skill	106k	yesterday	Apache-2.0	A	53	Claude Code, Codex
html-ppt-taste-brutalistnexu-io/open-design	Skill	106k	yesterday	Apache-2.0	A	78	Claude Code, Codex
visual-ralphYeachan-Heo/oh-my-codex	Skill	34k	4d ago	MIT	A	52	Codex
glance-canonical-layoutsandroid/skills	Skill	10k	yesterday	Apache-2.0	A	56	Claude Code
accessibilitymicrosoft/hve-core	Skill	1.6k	yesterday	MIT	A	47	Claude Code