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MPS: Skill for Claude Code

.agents/skills/code-style/SKILL.md

code-style is a skill for Claude Code, Codex from JetBrains/MPS. It costs 22 tokens per session (249 once invoked), scanned A, original, Apache-2.0.

A set of coding rules for the IntelliJ codebase, including language choices, formatting, naming, and Kotlin-specific practices. IntelliJ is a family of development tools and platforms from JetBrains.

In plain words
What is it for?
Use it when creating or reviewing IntelliJ-project code, especially new Kotlin files, existing Java files, build scripts, and code in the RustRover directory.
Why use it?
It gives contributors consistent rules to follow when writing or reviewing code, reducing style disagreements and avoidable review comments.

Skill for Claude CodeCodex ✓ vendor

Written for no agent in particular: nothing here depends on one. Also seen: installed under .agents/ (shared by several agents).

This is JetBrains/MPS's own configuration. It tells Claude Code and Codex how to work on MPS 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 MPS configures →

not rated 1.7krepo +4 yesterday A scan SkillSpector: pass 22 tokens original Apache-2.0
View source ↗ JetBrains/MPS jetbrains.com
About the project

JetBrains MPS is a development environment for creating domain-specific languages, which are programming languages designed for a particular field or task. It provides editors with features such as completion, semantic checks, and type checking, and can generate code in languages including Java and XML.

JetBrains/MPS · 1,666 stars · on GitHub · jetbrains.com

Reuse

Borrowing it

Nothing to install: this file belongs to JetBrains/MPS. 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/JetBrains/MPS/master/.agents/skills/code-style/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/JetBrains/MPS

Made for: Claude Code, Codex.

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 code-style

README.md
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Your own site
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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 code-style

Your own site · 80×15
<a href="https://agentmods.dev/skills/jetbrains/mps/code-style"><img src="https://agentmods.dev/badge/skills/jetbrains/mps/code-style.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 22 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 249 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. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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 $0.00022 $0.00249
Opus 5.5 $0.00009 $0.00100
Sonnet 5.5 $0.00004 $0.00050
Haiku 4.5 $0.00002 $0.00025

Measured 2mo ago against content hash f7162ba66f57, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

code-style 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 2mo 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.

.agents/skills/code-style/SKILL.md · 26 lines

What it actually says

Code Style

Follow the IntelliJ Coding Guidelines with these IntelliJ-specific rules.

Language

  • ALWAYS use Kotlin for new files - Only use Java when modifying existing Java code
  • Use idiomatic Kotlin: extension functions, data classes, null safety
  • Mark experimental APIs with @ApiStatus.Experimental
  • Build scripts Kotlin style: Follow community/platform/build-scripts/kotlin-style-recommendations.md for build-scripts code:
    • Use @JvmField for internal data class fields
    • Use .put()/.get() instead of [] operator
    • Use explicit HashMap/HashSet/LinkedHashMap instead of mutableMapOf()/mutableSetOf()

Formatting

  • Indentation: 2 spaces (4 for Go files)
  • Line length: 140 characters max
  • Braces: else/catch/finally on new lines
  • Only in /rustrover directory you must always use standard Kotlin formatting rules with 4 spaces indentation.
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. 2mo ago First seen · 26 lines · 22 tokens per session scan A f7162ba66f57

Subscribe to this mod's changes

code-style is a skill published in the GitHub repository JetBrains/MPS (1,666 stars, last pushed yesterday), licensed Apache-2.0. It adds 22 tokens to every session and 249 once invoked, about $0.0001 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.

domain-specific-languagedsl
Related

code-style compared with skills from other repositories

code-style next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
code-styleJetBrains/MPSSkill1.7kyesterdayApache-2.0A22Claude Code, Codex
langiumeclipse-langium/langium-aiSkill314d agoMITA33Claude Code
lai-gen-evalseclipse-langium/langium-aiSkill314d agoMITA42Claude Code
laieclipse-langium/langium-aiSkill314d agoMITA52Claude Code
lai-gen-descriptoreclipse-langium/langium-aiSkill314d agoMITA49Claude Code
lai-gen-mcpeclipse-langium/langium-aiSkill314d agoMITA43Claude Code
lai-gen-language-skilleclipse-langium/langium-aiSkill314d agoMITA33Claude Code