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.
npx agentmods add agents/johnlarkin1/claude-code-extensions/diagram-generatorgit clone --depth 1 https://github.com/johnlarkin1/claude-code-extensionsWrote 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/johnlarkin1/claude-code-extensions/diagram-generator)<a href="https://agentmods.dev/agents/johnlarkin1/claude-code-extensions/diagram-generator"><img src="https://agentmods.dev/badge/agents/johnlarkin1/claude-code-extensions/diagram-generator.svg" alt="Measured on agentmods" 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 | $0.00058 | $0.01185 |
| Opus 5 | $0.00029 | $0.00593 |
| Sonnet 5 | $0.00012 | $0.00237 |
| Haiku 4.5 | $0.00006 | $0.00119 |
Grade A, and why
diagram-generator 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 4d 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.
The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
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.
- 4d ago First seen · 149 lines · 58 tokens per session scan A c00b0fcf6df3
diagram-generator is an agent published in the GitHub repository johnlarkin1/claude-code-extensions (21 stars, last pushed 1mo ago), with no licence file. It adds 58 tokens to every session and 1,185 once invoked, about $0.0003 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.
Other agents, from other repositories
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clean-room-alternative
Generates a design alternative in isolation, without seeing the first design. Used by the design-it-twice skill when a first design already exists in conversation.
business-rule-audit-agent
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discovery-planning
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prototype-builder
Builds a fully working, interactive prototype by coordinating the prototype-builder skill and subagent-driven-prototyping flow. Runs after the Discovery Plan is approved and visual layout direction is confirmed by the SME. Each prototype component is built and reviewed separately before the SME is invited to click…
prototype-companion-agent
Phase A agent. Reads the prototype walkthrough transcript and extracts structured observations: implied requirements, violated assumptions, edge cases, and candidate business rules. Writes the canonical prototype-notes.md. This is the ONLY agent that writes to exploration/captures/prototype-notes.md …