Borrowing it
Nothing to install: this file belongs to jabrena/plinth. 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/jabrena/plinth/main/AGENTS.mdgit clone --depth 1 https://github.com/jabrena/plinthWrote 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/instructions/jabrena/plinth/agents-md)<a href="https://agentmods.dev/instructions/jabrena/plinth/agents-md"><img src="https://agentmods.dev/badge/instructions/jabrena/plinth/agents-md/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/instructions/jabrena/plinth/agents-md"><img src="https://agentmods.dev/badge/instructions/jabrena/plinth/agents-md.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 | $0.03046 | $0.03046 |
| Opus 5.5 | $0.01218 | $0.01218 |
| Sonnet 5.5 | $0.00609 | $0.00609 |
| Haiku 4.5 | $0.00305 | $0.00305 |
Grade A, and why
plinth AGENTS.md 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 1mo 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.
How it starts
The opening of the file, as written. The whole thing — 205 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Contributor Quickstart Guide
Your role
You are an expert Java developer and technical writer for this project.
- You understand Java 25, Maven, XML, XSLT, and Markdown
- You help maintain and extend a collection of cursor rules for Java Enterprise development
- Cursor rules under
.cursor/rules/are legacy checked-in content — you edit XML inplinth-skills-generator, not those Markdown files - Skills live in
skills/but are generated release output — you edit XML sources, not the output
Tech stack
- Language: Java 25
- Build: Maven (wrapper:
./mvnw) - Rule pipeline: XML → XInclude → XSLT → Markdown cursor rules
- Skill scanning:
skill-check@latestpluscisco-ai-skill-scannerbehavioral scans - Dependency scanning: Snyk Maven plugin through the opt-in
snykprofile - Site generator: JBake 2.7.0 with FreeMarker templates → GitHub Pages
Framework version baseline
- Spring Boot: Target 4.0.x by default;
- Quarkus: Target the current 3.x line by default;
- Micronaut: Target the current 4.x line by default;
Internal scripts
Use Java with JBang for repository-internal helper scripts such as conversion utilities, example generators, and validation helpers. Do not add new Python or ad hoc shell scripts for this kind of tooling.
Follow the markdown-validator entry-point pattern: a JBang-compatible .java file with a ///usr/bin/env jbang header, //JAVA 25, optional //DEPS, and a main method. Run with:
jbang path/to/Script.java [args]
Change workflow
This project uses OpenSpec for structured change management and planning:
GitHub Issues → OpenSpec → Agents + Skills
- GitHub Issues - Track problems, features, and architectural decisions
- OpenSpec (
documentation/openspec/) - Plan and coordinate implementation through:- Proposals - Problem statements and solution approaches
- Specs - Requirements with Given/When/Then scenarios
- Tasks - Detailed implementation checklists
- Agents + Skills - Generate the actual cursor rules and agent skills
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.
- 1mo ago First seen · 205 lines · 3,046 tokens per session scan A 7fd8378ffcab
plinth AGENTS.md is an instructions file published in the GitHub repository jabrena/plinth (456 stars, last pushed today), licensed Apache-2.0. It adds 3,046 tokens to every session, about $0.0122 per session on Opus 5.5. 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 instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
vscode model-prompts.instructions.md
Model-specific prompt authoring and registry guidelines.