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MPS: Skill for Claude Code

.agents/skills/mps-run-configurations/SKILL.md

mps-run-configurations is a skill for Claude Code, Codex from JetBrains/MPS. It costs 109 tokens per session (1,202 once invoked), scanned A, original, Apache-2.0.

A way to create and run IntelliJ MPS configurations for executable model nodes and tests. MPS is an IDE for building domain-specific languages; a run configuration tells the IDE what program or test to start.

In plain words
What is it for?
Use it to run MPS main-like roots, Java classes with a qualifying main method, and MPS test cases, including creating, reusing, or replacing run configurations.
Why use it?
It prevents common launch errors, such as running the wrong kind of node or executing stale compiled code.

Skill for Claude CodeCodex ✓ vendor

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

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 +2 today A scan SkillSpector: pass 109 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 · 1,657 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/mps-run-configurations/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/JetBrains/MPS

Made for: Claude Code, Codex.

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README.md
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Your own site · 80×15
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Per session 109 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,202 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 $0.00109 $0.01202
Opus 5 $0.00055 $0.00601
Sonnet 5 $0.00022 $0.00240
Haiku 4.5 $0.00011 $0.00120

Measured 9d ago against content hash e956f863acdc, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

mps-run-configurations 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 9d 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/mps-run-configurations/SKILL.md · 47 lines

How it starts

The opening of the file, as written. The whole thing — 47 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Running MPS Root Nodes

This skill covers the path from "an MPS root node exists in a model" to "a green IDE run / red stack trace in my hand," using only MCP tools. It targets user-level artifacts (DSL main-like roots, plain ClassConcept mains, test cases) — not launching MPS itself (the MPS / MPS (2nd inst.) configs are a different topic, see AGENTS.md or CLAUDE.md).

Critical Directives

  • execute_run_configuration and get_run_configurations are provided both by MPS and IDEA. Use the ones provided by MPS for running MPS nodes/tests.
  • mps_mcp_create_run_configuration accepts root nodes only, and only three shapes: implements IMainClass, implements ITestCase, or is a ClassConcept with a qualifying static main. Pointing it at a method body or other non-root yields the non-root rejection. See references/runnable-shapes.md for the exact predicate and producer precedence.
  • MAKE the module, not just the model, before running. Model MAKE regenerates source_gen but does not always compile into classes_gen; running launches bytecode, so a stale classes_gen silently runs old code. See references/compile-before-run.md.
  • Keep configurationName stable across iterations. The tool replaces the existing config of the same <type>.<name> rather than creating duplicates — idempotent setup is the goal. Use distinct names only when you actually want parallel configs.
  • Do not silently flip compileInMPS=false to true. Compile.None and JPS-compile settings are usually intentional (sandbox modules, externally-built modules, packaged libraries). Confirm with the user; otherwise take the IDEA MCP file-path fallback.
  • Prefer the source-root path over generated-Java entry points. Source-root configs survive regeneration; file-path configs against source_gen only work while classes_gen is fresh.
  • MPS MCP execute_run_configuration / get_run_configurations do not surface run points under source_gen. Use the IDEA MCP variants when you need a filePath+line launcher for generated Java.
  • Reuse before you create. If the user already has a working run config, prefer get_run_configurations() + execute_run_configuration by its existing name — duplicates are pointless.

Read the full file on GitHub · 47 lines

Files

What ships with it

6 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 9d ago First seen · 47 lines · 109 tokens per session scan A e956f863acdc

Subscribe to this mod's changes

mps-run-configurations is a skill published in the GitHub repository JetBrains/MPS (1,657 stars, last pushed today), licensed Apache-2.0. It adds 109 tokens to every session and 1,202 once invoked, about $0.0005 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.

domain-specific-languagedsl
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