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Official agent skill

Mps Language Inheritance

by JetBrains in JetBrains/MPS

Investigate inheritance between MPS languages and between concepts — extended languages, superconcepts, implemented interfaces, sub-/assignable concepts, and cross-language specialization.

OfficialApache-2.0Auto-check passed

Install Mps Language Inheritance

skills CLI
$ npx skills add JetBrains/MPS --skill mps-language-inheritance -a claude-code

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

GitHub CLI
$ gh skill install JetBrains/MPS mps-language-inheritance --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-language-inheritance .claude/skills/mps-language-inheritance && 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-language-inheritance
GitHub stars
1.7k
Token cost
~1.1k tokens
SKILL.md length
479 words
Files
1
Skills in repo
41
Repo updated
First seen
Licence
Apache-2.0

At a glance

Investigate inheritance between MPS languages and between concepts — extended languages, superconcepts, implemented interfaces, sub-/assignable concepts, and cross-language specialization.

  • Works in 3 steps: Tool: mps_mcp_get_project_structure… → Workflow: check the extendedLanguages… → Hierarchy tracing: recursively call this…
  • Tracing language hierarchies
  • SKILL.md covers Loading companion skills, Critical Directives, Module-Level Inheritance… and Concept-Level Inheritance, plus 3 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Mps Language Inheritance is an agent skill from JetBrains/MPS, published by the product's own GitHub organization. Investigate inheritance between MPS languages and between concepts — extended languages, superconcepts, implemented interfaces, sub-/assignable concepts, and cross-language specialization. Use when tracing language hierarchies, finding extension points, or checking concept assignability.

Its SKILL.md is about 1.1k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

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

  • Tracing language hierarchies
  • Finding extension points
  • Checking concept assignability

Example prompts

  • “/mps-language-inheritance”

Workflow steps

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

  1. Tool: mps_mcp_get_project_structure (with includeDependencies: true).
  2. Workflow: check the extendedLanguages field in the response for the target language. This lists direct parent languages.
  3. Hierarchy tracing: recursively call this tool for each parent to build the full inheritance tree.

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 Language Inheritance loads about 1.1k tokens when it runs. Until then it costs about 78 tokens; SKILL.md has 479 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~78
When it runs · the whole SKILL.md, loaded when a task matches
~1.1k

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). 479 words, ~1,106 tokens.

Download SKILL.mdSave it as .claude/skills/mps-language-inheritance/SKILL.md (or your agent's skills folder).
name
mps-language-inheritance
description
Investigate inheritance between MPS languages and between concepts — extended languages, superconcepts, implemented interfaces, sub-/assignable concepts, and cross-language specialization. Use when tracing language hierarchies, finding extension points, or checking concept assignability.
type
reference

MPS Language and Concept Inheritance

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.

Two layers of inheritance matter in MPS: module-level (one language extends another) and concept-level (concepts inherit superconcepts and implement interface concepts).

Critical Directives

  • Concept-level inheritance is realized through module-level extension — different languageReference on a concept and its superConcept indicates a cross-language specialization, which usually requires the consumer's language to extend the parent.
  • GET_ALL_SUPERCONCEPTS gives the full transitive closure in a single call — prefer it over recursive walking of superConcept / superInterfaces.
  • IS_SUBCONCEPT_OF is the fastest way to verify a single assignability question; do not enumerate GET_SUB_CONCEPTS and search by hand.

Module-Level Inheritance (Language Extension)

One language can inherit the structure and functionality of another via an "extends" relationship.

  1. Tool: mps_mcp_get_project_structure (with includeDependencies: true).
  2. Workflow: check the extendedLanguages field in the response for the target language. This lists direct parent languages.
  3. Hierarchy tracing: recursively call this tool for each parent to build the full inheritance tree.

Concept-Level Inheritance

Upward Hierarchy (Ancestors)
  • Direct ancestors: use mps_mcp_get_concept_details. The response includes:
    • superConcept: immediate parent concept.
    • superInterfaces: immediate implemented interface concepts.
    • superConceptContainingProject and superInterfaceDetails[*].containingProject when an ancestor comes from another open MPS project and is read-only from the selected project.
  • Full closure: use mps_mcp_query_structure with GET_ALL_SUPERCONCEPTS to get the complete chain of ancestors and interfaces in one call.
Show full SKILL.md (166 more words)Show less
Downward Hierarchy (Descendants)
  • Specializations: use mps_mcp_query_structure with GET_SUB_CONCEPTS to find all concepts (direct and indirect) inheriting from a base.
  • Implementations: use GET_ASSIGNABLE_CONCEPTS to retrieve only non-abstract subconcepts that can be instantiated.

Strategic Analysis

  • Verification: use mps_mcp_query_structure with IS_SUBCONCEPT_OF to check if concept A inherits from concept B.
  • Cross-language extension: compare the languageReference of a concept with that of its superConcept. Different references indicate a language boundary specialization; foreign-project ancestors are marked explicitly with the containing-project fields.
  • Discovery: use mps_mcp_search_concepts to find base concepts (e.g. "Statement") for extension.
  • Implicit dependencies: if a model uses a language without an explicit import, check if its used languages extend the missing language via mps_mcp_get_project_structure.

Best Practice

Identify extension points by first checking high-level extendedLanguages via mps_mcp_get_project_structure, then use mps_mcp_get_concept_details to pinpoint cross-language concept specializations.

  • mps-language-analysis — start here when you need general language inspection, not just inheritance.
  • mps-aspect-structure-concepts — when you intend to define new concepts (with their own super/interface lists).
  • mps-aspect-accessories — for extendedLanguages vs usedLanguages semantics at module level.

© 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

Just SKILL.md in .agents/skills/mps-language-inheritance of JetBrains/MPS.

Open the folder on GitHubat commit 3e9cfcd

Compare with similar skills

Mps Language Inheritance 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 Language Inheritance compared with similar skills
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MCP Integration for Pluginsanthropics/claude-plugins-official38k11 repos~3.1kAutomated safety check: PassApache-2.0
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Stitch to Remotion Walkthrough Videosgoogle-labs-code/stitch-skills8.4k6 repos~3.2kAutomated safety check: NotesApache-2.0

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Works with

Questions about Mps Language Inheritance

What does Mps Language Inheritance do?

Investigate inheritance between MPS languages and between concepts — extended languages, superconcepts, implemented interfaces, sub-/assignable concepts, and cross-language specialization. Mps Language Inheritance is an agent skill from JetBrains/MPS, published by the product's own GitHub organization. Investigate inheritance between MPS languages and between concepts — extended languages, superconcepts, implemented interfaces, sub-/assignable concepts, and cross-language specialization.

When should I use Mps Language Inheritance?

Mps Language Inheritance fits situations like: tracing language hierarchies; finding extension points; checking concept assignability.

How do I install Mps Language Inheritance in Claude Code?

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

How do I install Mps Language Inheritance in Codex?

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

Can I use Mps Language Inheritance 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-language-inheritance -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-language-inheritance, .gemini/skills/mps-language-inheritance, .github/skills/mps-language-inheritance and .opencode/skills/mps-language-inheritance in your project.

What does Mps Language Inheritance need to run?

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

Does Mps Language Inheritance 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 Language Inheritance 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 Language Inheritance use?

Mps Language Inheritance 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 Language Inheritance use?

About 1.1k tokens (SKILL.md is roughly 4.4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Mps Language Inheritance?

Skills that share tags, products or a category with Mps Language Inheritance: 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 Language Inheritance?

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 8, 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.