slidev:diagram

slidev:diagram is a command for Claude Code from rhuss/cc-slidev. It costs 14 tokens per session (3,546 once invoked), scanned A, original, MIT.

A command for creating or improving a diagram on a particular presentation slide. It supports Mermaid, PlantUML, and Excalidraw, which are different tools for describing or drawing diagrams.

In plain words
What is it for?
Use it to add architecture diagrams, process flows, or other visual explanations to a specific slide and generate the enabled diagram formats.
Why use it?
It provides a consistent place for diagram source files and rendered images while considering readability, accessibility, and the number of items shown.

Command for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Runs only inside its plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else. Install the plugin, not this.

Part of the slidev plugin — 8 skills, 18 commands, 2 agents shipped together

Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code
/plugin marketplace add rhuss/cc-slidev
Claude Code
/plugin install slidev

Made for: Claude Code.

Or install slidev, the plugin that ships this one along with the rest of its 8 skills, 18 commands, 2 agents.

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 slidev:diagram

README.md
[![agentmods](https://agentmods.dev/badge/commands/rhuss/cc-slidev/diagram.svg)](https://agentmods.dev/commands/rhuss/cc-slidev/diagram)
Your own site
<a href="https://agentmods.dev/commands/rhuss/cc-slidev/diagram"><img src="https://agentmods.dev/badge/commands/rhuss/cc-slidev/diagram.svg" alt="Measured on agentmods" height="20"></a>
Per session 14 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 3,546 The whole file, excluding the scripts and references it only reads on demand.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00014 $0.03546
Opus 5 $0.00007 $0.01773
Sonnet 5 $0.00003 $0.00709
Haiku 4.5 $0.00001 $0.00355

Measured 6d ago against content hash 945f43792d17, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

slidev:diagram 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 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.

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.

slidev/commands/diagram.md · 511 lines

How it starts

The opening of the file, as written. The whole thing — 511 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Diagram Creation for Specific Slide

Focus on creating diagrams for a specific slide with multi-platform support (Mermaid, PlantUML, Excalidraw) using evidence-based cognitive load limits and colorblind-safe design.

Evidence Base: Diagram design follows research-based principles for cognitive load (max 7-9 nodes), colorblind accessibility, and visual clarity. See references/presentation-best-practices.md for guidelines.

Multi-Platform: Diagrams are automatically generated in all enabled formats (configurable in default.json or per-presentation slidev.config.json). Mermaid code is embedded inline by default, with PlantUML and Excalidraw alternatives saved for flexibility.

Execution

IMPORTANT - File Organization:

  • Source files (.mmd, .puml, .excalidraw) → Always save to ./diagrams/
  • Rendered images (.svg, .png) → Save to ./public/images/<slide-title>/
  • This keeps sources version-controlled separately from generated outputs

CRITICAL - Embedding Rules:

  • Mermaid: CAN be embedded inline in markdown (Slidev renders it)
  • PlantUML: NEVER embed - only reference rendered SVG images
  • Excalidraw: NEVER embed - only reference rendered SVG images

1. Parse Slide Number

Extract from $ARGUMENTS:

  • Must be valid number
  • If missing: Ask "Which slide number should we create a diagram for?"

2. Read Target Slide

Find slides.md and locate slide:

  • Extract slide content
  • Check if diagram already exists
  • Understand slide topic and content

Show user the slide:

## Slide [N]: [Title]

**Current Content:**
[Slide content]

**Existing Visual:** [Yes: diagram type / No]

3. Analyze Content for Diagram Type (Evidence-Based)

Determine Best Platform (Mermaid vs Excalidraw vs PlantUML):

Analyze slide content to determine which platform best conveys the concept:

Use Excalidraw (invoke skill) when:

  • Conceptual relationships need spatial layout
  • Architecture with nested components (frames for boundaries)
  • Brainstorming/ideation context (hand-drawn aesthetic)
  • Informal, approachable style needed (whiteboard feel)
  • Annotations and callouts would add value
  • Mind maps or radial structures
  • Keywords detected: "architecture", "components", "system design", "overview", "spatial"

Read the full file on GitHub · 511 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. 6d ago First seen · 511 lines · 14 tokens per session scan A 945f43792d17

Subscribe to this mod's changes

slidev:diagram is a command published in the GitHub repository rhuss/cc-slidev (51 stars, last pushed 18d ago), licensed MIT. It adds 14 tokens to every session and 3,546 once invoked, about $0.0001 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 2026-08-30.