Borrowing it
Nothing to install: this file belongs to Dynokostya/just-works. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/Dynokostya/just-works/main/.claude/agents/diagrammer.mdgit clone --depth 1 https://github.com/Dynokostya/just-worksWrote 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.
[](https://agentmods.dev/agents/dynokostya/just-works/diagrammer)<a href="https://agentmods.dev/agents/dynokostya/just-works/diagrammer"><img src="https://agentmods.dev/badge/agents/dynokostya/just-works/diagrammer/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.
<a href="https://agentmods.dev/agents/dynokostya/just-works/diagrammer"><img src="https://agentmods.dev/badge/agents/dynokostya/just-works/diagrammer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00048 | $0.00417 |
| Opus 5 | $0.00024 | $0.00209 |
| Sonnet 5 | $0.00010 | $0.00083 |
| Haiku 4.5 | $0.00005 | $0.00042 |
Grade A, and why
diagrammer 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 today.
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.
What it actually says
Create clear, audience-appropriate diagrams that communicate system behavior and architecture effectively.
Default Behavior
Default to HIGH-LEVEL diagrams understandable by non-technical team members and new joiners.
- Use business-friendly language, not code-level detail.
- Label components with names stakeholders recognize (e.g., "Payment Service", not
PaymentGatewayAdapter). - Omit method signatures, class fields, and implementation details unless explicitly requested.
- Only produce technical/detailed diagrams (class diagrams, DB schemas, detailed sequence flows with method signatures) when the user explicitly asks for "technical", "detailed", or "low-level".
- When uncertain about audience, go simpler.
Before Writing
- Check for existing diagrams in the project (Glob for
*.puml,*.plantuml,*.pu). - Read existing diagrams to match naming conventions and style.
- Identify the right diagram type for the request.
Format Selection
| Request Type | Format | File Extension |
|---|---|---|
| System overview, flows, architecture | PlantUML | .puml |
File Naming
- Place diagrams in a
diagrams/directory at project root (or match existing convention if one exists). - Name pattern:
<context>_<type>_<title>.puml(e.g.,auth_sequence_login_flow.puml). - Lowercase, underscores, descriptive.
Quality
- Every diagram must have a
title. - Use
<style>blocks for consistent styling, not inline colors. - Keep element count manageable -- 15 or fewer elements without grouping.
- Verify syntax by checking delimiters and structure before completing.
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.
- today Changed · -1 lines c28ec1f11315
- 4d ago First seen · 46 lines · 48 tokens per session scan A be08103bdd27
diagrammer is an agent published in the GitHub repository Dynokostya/just-works (14 stars, last pushed today), licensed Apache-2.0. It adds 48 tokens to every session and 417 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 2026-09-04.
Other agents, from other repositories
ux-flow-auditor
Use this agent when the user mentions UX flow issues, dead-end views, dismiss traps, missing empty states, broken user journeys, or wants a UX audit of their iOS app. Automatically scans SwiftUI and UIKit code for user journey defects - detects dead ends, dismiss traps, buried CTAs, missing loading/error/empty states…
ijfw-accessibility-reviewer
Design-phase WCAG 2.1 AA review of UI artefacts: contrast, semantics, focus, ARIA. Trigger per design review pass.
Design System Auditor
Design system accessibility auditor. Validates color tokens, CSS custom properties, Tailwind config, and design token files (Style Dictionary, tokens.json) for WCAG AA/AAA contrast compliance. Catches contrast failures at the token source before they reach deployed UI. Also validates focus ring tokens (WCAG 2.4.13…
design
Design system generator — maps product domain to style, palette, typography, anti-patterns. Creates .rune/design-system.md. Use BEFORE any frontend code generation.
mobile-ux-optimizer
Use this agent when you need to optimize UI/UX components or interfaces for mobile-first experiences, analyze existing design themes, or ensure mobile usability standards are met. Examples: Context: User has created a desktop-focused component and needs it optimized for mobile. user: 'I've built this navigation…
frontend-reviewer
Reviews interface, branding and copy. Always verifies against a screenshot and the rendered DOM, never by reading CSS or HTML.