agentmods.dev

code-style

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

1.7k 2d ago A scan 22 tokens original Apache-2.0
View the source file JetBrains/MPS
Install

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.

agentmods
npx agentmods add skills/jetbrains/mps/code-style
Any agent
npx skills add JetBrains/MPS --skill code-style
Clone the repo
git clone --depth 1 https://github.com/JetBrains/MPS

Made for: Claude Code, Codex.

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. Scan, not verified.
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 $0.00022 $0.00249
Opus 5 $0.00011 $0.00125
Sonnet 5 $0.00004 $0.00050
Haiku 4.5 $0.00002 $0.00025

Measured 2d ago against content hash f7162ba66f57, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, 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 2d 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. 2d 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 (1,656 stars, last pushed 2d ago), licensed Apache-2.0. It adds 22 tokens to every session and 249 once invoked, about $0.0001 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.

LanguagesMobileWriting and docsdomain-specific-languagedsl
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