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Official agent skill

Mps Aspect Accessories

by JetBrains in JetBrains/MPS

Wire MPS module and model dependencies, used languages, used devkits, extended languages, runtime solutions, accessory models, and language/dependency versions.

OfficialApache-2.0Auto-check passed

Install Mps Aspect Accessories

skills CLI
$ npx skills add JetBrains/MPS --skill mps-aspect-accessories -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install JetBrains/MPS mps-aspect-accessories --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/JetBrains/MPS.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/mps-aspect-accessories .claude/skills/mps-aspect-accessories && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
mps-aspect-accessories
GitHub stars
1.7k
Token cost
~1.9k tokens
SKILL.md length
833 words
Files
11 (incl. references)
Skills in repo
41
Repo updated
First seen
Licence
Apache-2.0

At a glance

Wire MPS module and model dependencies, used languages, used devkits, extended languages, runtime solutions, accessory models, and language/dependency versions.

  • Works in 4 steps: Inspect existing wiring:… → Diagnose the symptom against the… → Apply the right MCP tool at the right… → …
  • Adding/removing module dependencies
  • SKILL.md covers Loading companion skills, Critical Directives, Rule of Thumb — Dependency vs.… and MCP Tools Quick Reference, plus 3 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Mps Aspect Accessories is an agent skill from JetBrains/MPS, published by the product's own GitHub organization. Wire MPS module and model dependencies, used languages, used devkits, extended languages, runtime solutions, accessory models, and language/dependency versions. Use when adding/removing module dependencies, importing languages or devkits into a model, declaring runtime solutions, or shipping accessory content visible to consumers without explicit import.

Its SKILL.md is about 1.9k tokens, which your agent loads only when the skill is triggered. The skill folder holds 11 other files, including reference files (for example `references/accessory-models.md`, `references/aspect-model-stereotypes.md` and `references/extends-vs-uses.md`).

It works with Model Context Protocol. The repository describes itself as: JetBrains Meta programming System. The licence is Apache-2.0.

When your agent uses it

  • Adding/removing module dependencies
  • Importing languages
  • Devkits into a model
  • Declaring runtime solutions

Example prompts

  • “/mps-aspect-accessories”

Workflow steps

4 steps, taken from the first numbered list in SKILL.md.

  1. Inspect existing wiring: mps_mcp_get_project_structure(startingPoint=) for the module descriptor, mps_mcp_get_project_structure for…
  2. Diagnose the symptom against the pitfalls table (references/pitfalls.md).
  3. Apply the right MCP tool at the right layer (module vs. model vs. accessory).
  4. Rebuild the module so MPS re-reads the descriptor.

What it can do on your machine

Read from SKILL.md and the folder at commit 3e9cfcd. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Mps Aspect Accessories loads about 1.9k tokens when it runs, and up to ~12k if it reads all its reference files. Until then it costs about 95 tokens; SKILL.md has 833 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~95
When it runs · the whole SKILL.md, loaded when a task matches
~1.9k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~12k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from JetBrains/MPS at commit 3e9cfcd, republished under its Apache-2.0 licence (© JetBrains). 833 words, ~1,859 tokens.

Download SKILL.mdSave it as .claude/skills/mps-aspect-accessories/SKILL.md (or your agent's skills folder). This skill also uses 10 other files; get the full folder from GitHub.
name
mps-aspect-accessories
description
Wire MPS module and model dependencies, used languages, used devkits, extended languages, runtime solutions, accessory models, and language/dependency versions. Use when adding/removing module dependencies, importing languages or devkits into a model, declaring runtime solutions, or shipping accessory content visible to consumers without explicit import.
type
reference

MPS Module and Model Dependencies, Accessory Models

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.

This skill covers the wiring layer of an MPS language — the module descriptor (.mpl) and the per-model imports — and the special role of accessory models and runtime solutions.

Note: accessory wiring does not introduce a new aspect model or stereotype; it edits the existing language descriptor and model imports. When you do need to create a new aspect or stereotyped model, see aspect-model-stereotypes.md for the canonical aspect IDs and @stereotype values.

Critical Directives

  • Prefer MCP wiring tools over hand-editing .mpl XML. Hand-editing can silently corrupt the module descriptor. If you must hand-edit (e.g. for accessoryModels, which has no dedicated MCP tool), make a backup, edit only the targeted block, and rebuild the module immediately afterwards so MPS re-reads the descriptor.
  • Don't hand-edit languageVersions / dependencyVersions. These are the consumer-side stamps recording which version of another language a module was last migrated against; MPS maintains them. Use the MPS "Update language/dependency versions" action.
  • A language's OWN version is a different number, exposed as languageVersion on every Language module in mps_mcp_get_project_structure and derived from the migration scripts by mps_mcp_update_module(operation = "SYNC_VERSION") (max(fromVersion) + 1, computed for you; there is no way to set it to an arbitrary value). It is the integer a migration script's fromVersion gates on, and both MigrationScript and PureMigrationScript get it from their node factory when created through a factory-running path — never set it by hand. Never hand-edit it in the .mpl, and never "fix" a migration by refreshing the consumer stamps instead — that marks the migration as already applied. See module-info-fields.md and the mps-aspect-migrations skill.
  • Generator modules have their own dependency list. Add target-language deps to the generator, not the parent language.
  • Used languages auto-import when nodes are inserted via mps_mcp_insert_root_node_from_json, mps_mcp_update_node. Manually add a used language only for hand-written code or implicit dependencies.
  • A runtime solution holds the stable part of generation (code that doesn't vary with the model). Generate thin code that calls it; don't regenerate it. No MCP tool wires the language's <runtime> block — see references/runtime-solutions.md.

Rule of Thumb — Dependency vs. Used Language

  • If a concept is used in your language definition → add a usedLanguage.
  • If a Java class is referenced in hand-written code → add a dependency with the right scope.

MCP Tools Quick Reference

  • Module-level: mps_mcp_module_dependency, mps_mcp_get_project_structure.
  • Model-level: mps_mcp_model_dependency, mps_mcp_model_used_language (kind = language or devkit).
  • Module creation: mps_mcp_create_module(type="solution", …) for a runtime solution.
Show full SKILL.md (338 more words)Show less

Common Workflow

  1. Inspect existing wiring: mps_mcp_get_project_structure(startingPoint=<module>) for the module descriptor, mps_mcp_get_project_structure for traversal.
  2. Diagnose the symptom against the pitfalls table (references/pitfalls.md).
  3. Apply the right MCP tool at the right layer (module vs. model vs. accessory).
  4. Rebuild the module so MPS re-reads the descriptor.
  • mps-language-inheritance — when you need the difference between extendedLanguages and usedLanguages in detail.
  • mps-aspect-generator — generator-module dependencies are managed separately from the parent language.
  • mps-language-aspects-overview — to know which aspects exist and where each one lives.

Reference Index

Start here — most common case: adding a module-level dependency, used language, extended language or devkit → read only references/module-level-deps.md; importing a language or model into one model → only references/model-level-imports.md; a concrete symptom ("Cannot resolve concept X", ClassNotFoundException, version mismatch) → only references/pitfalls.md.

  • Open references/module-level-deps.md for the full list of .mpl declarations (dependencies, usedLanguages, usedDevKits, extendedLanguages, runtimeModules, generators, accessoryModels, version stamps), their scopes, and the mps_mcp_module_dependency scope-dispatch table.
  • Open references/model-level-imports.md for per-model dependencies, used languages, used devkits, and the auto-import behavior of node-insertion tools.
  • Open references/accessory-models.md when shipping a model that should be available to every consumer of the language without an explicit import — including the .mpl <accessoryModels> XML shape and the hand-edit caveat.
  • Open references/runtime-solutions.md for runtime solutions — shipping the Java that generated programs call at run time (the generator's stable part, as MPS source or a prebuilt JAR): the Java-facet settings, the language <runtime>-block wiring, jar-as-stubs (java_classes model root + facet <library>), the no-MCP-tool caveat, and the Kaja/JavaKaja worked example.
  • Open references/extends-vs-uses.md for the semantic difference between extendedLanguages and usedLanguages with examples.
  • Open references/pitfalls.md when you need to diagnose a symptom ("Cannot resolve concept X", "ClassNotFoundException", version mismatch, generator can't find target-language concept, devkit changes not picked up).
  • Open references/module-creation.md for mps_mcp_create_module — supported types, language-only companions (withGenerator/withSandbox/withRuntime), the facets policy, and what mps_mcp_update_module DELETE does to a language-owned generator.
  • Open references/module-rename.md for mps_mcp_update_module — what the rename cascades into, the "generator modules are not renameable" rule, and the renameWarnings/renameCriticalProblems semantics.
  • Open references/module-info-fields.md for the shared info envelope returned by mps_mcp_get_project_structure(startingPoint=<module>) / mps_mcp_create_module / mps_mcp_update_module — kind, facets, loadExtensions, DevKit-only fields.

© JetBrains, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 10 other files (references) in .agents/skills/mps-aspect-accessories of JetBrains/MPS.

  • SKILL.md
  • references/accessory-models.md
  • references/aspect-model-stereotypes.md
  • references/extends-vs-uses.md
  • references/model-level-imports.md
  • references/module-creation.md
  • references/module-info-fields.md
  • references/module-level-deps.md
  • references/module-rename.md
  • references/pitfalls.md
  • references/runtime-solutions.md

Open the folder on GitHubat commit 3e9cfcd

Compare with similar skills

Mps Aspect Accessories next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Mps Aspect Accessories compared with similar skills
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Mps Aspect Accessories this skillJetBrains/MPS1.7k—~1.9kAutomated safety check: PassApache-2.0
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MCP Server BuildershareAI-lab/learn-claude-code78k4 repos~1.2kAutomated safety check: PassMIT
MCP Integration for Pluginsanthropics/claude-plugins-official38k11 repos~3.1kAutomated safety check: PassApache-2.0
Figma use_figma Plugin API Ruleswarpdotdev/warp65k4 repos~4.4kAutomated safety check: PassAGPL-3.0
Stitch to Remotion Walkthrough Videosgoogle-labs-code/stitch-skills8.5k6 repos~3.2kAutomated safety check: NotesApache-2.0

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Works with

Questions about Mps Aspect Accessories

What does Mps Aspect Accessories do?

Wire MPS module and model dependencies, used languages, used devkits, extended languages, runtime solutions, accessory models, and language/dependency versions. Mps Aspect Accessories is an agent skill from JetBrains/MPS, published by the product's own GitHub organization. Wire MPS module and model dependencies, used languages, used devkits, extended languages, runtime solutions, accessory models, and language/dependency versions.

When should I use Mps Aspect Accessories?

Mps Aspect Accessories fits situations like: adding/removing module dependencies; importing languages; devkits into a model; declaring runtime solutions.

How do I install Mps Aspect Accessories in Claude Code?

Run `npx skills add JetBrains/MPS --skill mps-aspect-accessories -a claude-code`. Or copy the skill folder (.agents/skills/mps-aspect-accessories in JetBrains/MPS) into .claude/skills/mps-aspect-accessories in your project. Claude Code loads it when a task matches its description.

How do I install Mps Aspect Accessories in Codex?

Run `npx skills add JetBrains/MPS --skill mps-aspect-accessories -a codex`. Or copy the skill folder (.agents/skills/mps-aspect-accessories in JetBrains/MPS) into .agents/skills/mps-aspect-accessories in your project. Codex loads it when a task matches its description.

Can I use Mps Aspect Accessories in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add JetBrains/MPS --skill mps-aspect-accessories -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/mps-aspect-accessories, .gemini/skills/mps-aspect-accessories, .github/skills/mps-aspect-accessories and .opencode/skills/mps-aspect-accessories in your project.

What does Mps Aspect Accessories need to run?

SKILL.md names no scripts, command-line tools or credentials: Mps Aspect Accessories is instructions for the agent only.

Does Mps Aspect Accessories access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Mps Aspect Accessories safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Mps Aspect Accessories use?

Mps Aspect Accessories is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Mps Aspect Accessories use?

About 1.9k tokens (SKILL.md is roughly 7.4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 11k tokens, read only when the agent opens those files.

What are the alternatives to Mps Aspect Accessories?

Skills that share tags, products or a category with Mps Aspect Accessories: MCP Server Builder (anthropics/skills, 180k stars), MCP Server Builder (shareAI-lab/learn-claude-code, 78k stars), MCP Integration for Plugins (anthropics/claude-plugins-official, 38k stars) and Figma use_figma Plugin API Rules (warpdotdev/warp, 65k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Mps Aspect Accessories?

JetBrains (a GitHub organization, an official publisher) maintains it in JetBrains/MPS, which has 1,661 GitHub stars. The repository holds 41 skills in this directory. The repository was last updated on October 9, 2026.

Source: JetBrains/MPS on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.