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MPS: Skill for Claude Code

.agents/skills/mps-aspect-intentions/SKILL.md

mps-aspect-intentions is a skill for Claude Code, Codex from JetBrains/MPS. It costs 89 tokens per session (2,063 once invoked), scanned A, original, Apache-2.0.

A guide for creating intentions in JetBrains MPS, which are optional actions shown for the current code element, commonly through an Alt+Enter menu. Intentions can transform, wrap, or refactor model content.

In plain words
What is it for?
Use it to define when an action appears, describe it, execute model changes, create parameterized or surround-with variants, and troubleshoot missing actions.
Why use it?
It provides a consistent way to offer context-aware fixes and transformations without forcing them on the user.

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 changed 2d ago A scan SkillSpector: pass 89 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/mps-aspect-intentions/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.

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README.md
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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.

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Your own site · 80×15
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Per session 89 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,063 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 $0.00089 $0.02063
Opus 5.5 $0.00036 $0.00825
Sonnet 5.5 $0.00018 $0.00413
Haiku 4.5 $0.00009 $0.00206

Measured 2d ago against content hash 454931ed8f64, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mps-aspect-intentions 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/mps-aspect-intentions/SKILL.md · 67 lines

How it starts

The opening of the file, as written. The whole thing — 67 lines — stays where its author put it; the contents beside it link to each section on GitHub.

MPS Intentions Aspect

Loading companion skills

Companion names in this skill are lazy dependencies: load only those relevant to the current task. If this skill came from an MCP server, use the host's skill loader to resolve the companion's unique discovered entry URI on the same host-assigned originating server. If the host has no server-backed skill loader, stop and report that limitation; do not silently fall back to a filesystem copy. If this skill came from a filesystem catalog, load the named sibling from that same catalog at <skills-root>/<skill-name>/SKILL.md, even if remote skill loaders are also available. Do not invent a tool name or server endpoint.

Intentions are user-invoked transformations shown in the Alt+Enter popup on a node. They are the canonical way to offer optional refactorings (wrap, convert, introduce, preview) alongside quick-fixes. Authoring lives in <lang>/languageModels/intentions.mps, language jetbrains.mps.lang.intentions.

Critical Directives

  • Edit intention roots through MPS MCP tools (mps_mcp_insert_root_node_from_json, mps_mcp_update_node, mps_mcp_parse_java_and_insert). Do not hand-edit serialized .mps files.
  • The intentions model must list every language used in any block body as a used language. In particular, the add new initialized(...) surface syntax requires jetbrains.mps.lang.actions — add it with mps_mcp_model_used_language(kind="language"). Plain (non-NF_*) variants like parent.role.add new(C) do not need this import.
  • Use n as C (MPS SNodeTypeCastExpression with asCast=true) — never a Java (C) n cast.
  • Use :eq: (NPEEqualsExpression) instead of == whenever either operand might be null.
  • The execute body runs on the EDT inside an MPS write action automatically — do not spawn threads or open dialogs that block.
  • descriptionFunction runs every time the Alt+Enter popup opens — keep it cheap.
  • After editing, validate with mps_mcp_check_root_node_problems on the intention root and rebuild the language before testing.

Read the full file on GitHub · 67 lines

Files

What ships with it

8 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. 2d ago Changed · +1 lines 454931ed8f64
  2. 29d ago Changed · +1 lines ada9930a262b
  3. 1mo ago Changed · +6 lines e0639b536b57
  4. 2mo ago First seen · 59 lines · 89 tokens per session scan A 249f25ff731a

Subscribe to this mod's changes

mps-aspect-intentions is a skill published in the GitHub repository JetBrains/MPS (1,666 stars, last pushed yesterday), licensed Apache-2.0. It adds 89 tokens to every session and 2,063 once invoked, about $0.0004 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

mps-aspect-intentions compared with skills from other repositories

mps-aspect-intentions next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
mps-aspect-intentionsJetBrains/MPSSkill1.7kyesterdayApache-2.0A89Claude 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