just-works: Agent for Claude Code

.claude/agents/diagrammer.md

diagrammer is an agent for Claude Code from Dynokostya/just-works. It costs 48 tokens per session (417 once invoked), scanned A, original, Apache-2.0.

An agent for creating or editing architecture and system diagrams, especially PlantUML files. PlantUML is a text format that describes diagrams so they can be stored and regenerated as code.

In plain words
What is it for?
It is for making high-level system overviews, process flows, architecture visuals, and more detailed technical diagrams when requested.
Why use it?
It helps choose a diagram type and keep diagrams understandable for the intended audience. It also checks existing diagram files so new work can follow the project's conventions.

Agent for Claude Code

Written for Claude Code: installed under .claude/.

This is Dynokostya/just-works's own configuration. It tells Claude Code how to work on just-works 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 just-works configures →

Reuse

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.

Copy the file
curl -O https://raw.githubusercontent.com/Dynokostya/just-works/main/.claude/agents/diagrammer.md
Clone the repo
git clone --depth 1 https://github.com/Dynokostya/just-works

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.

agentmods badge for diagrammer

README.md
[![agentmods](https://agentmods.dev/badge/agents/dynokostya/just-works/diagrammer/github.svg)](https://agentmods.dev/agents/dynokostya/just-works/diagrammer)
Your own site
<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.

agentmods 80×15 button for diagrammer

Your own site · 80×15
<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>
Per session 48 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 417 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 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 $0.00048 $0.00417
Opus 5 $0.00024 $0.00209
Sonnet 5 $0.00010 $0.00083
Haiku 4.5 $0.00005 $0.00042

Measured today against content hash c28ec1f11315, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

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.

.claude/agents/diagrammer.md · 45 lines

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.
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. today Changed · -1 lines c28ec1f11315
  2. 4d ago First seen · 46 lines · 48 tokens per session scan A be08103bdd27

Subscribe to this mod's changes

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.

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