What is mps-ide-plugin?

A guide for building MPS IDE plugins: code that adds menus, actions, dockable panels, keyboard shortcuts, and settings pages to the MPS or IntelliJ-based host IDE.

Use it to create or modify MPS solutions that add IDE actions, tool windows, shortcuts, and preferences.

It clarifies MPS-specific concepts and the correct project structure, preventing confusion between plugin models, actions, and tool windows.

mps-ide-plugin — Skill for Claude Code and Codex by JetBrains: A guide for building MPS IDE plugins: code that…

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/mps-ide-plugin

Any agent

npx skills add JetBrains/MPS --skill mps-ide-plugin

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/jetbrains/mps/mps-ide-plugin.svg)](https://agentmods.dev/skills/jetbrains/mps/mps-ide-plugin)

Your own site

<a href="https://agentmods.dev/skills/jetbrains/mps/mps-ide-plugin"><img src="https://agentmods.dev/badge/skills/jetbrains/mps/mps-ide-plugin.svg" alt="Measured on agentmods" height="20"></a>

Per session 209 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 3,449 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.

Model	Per session	Once invoked
Fable 5	$0.00209	$0.03449
Opus 5	$0.00105	$0.01724
Sonnet 5	$0.00042	$0.00690
Haiku 4.5	$0.00021	$0.00345

Measured 4d ago against content hash fc961af0d677, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

mps-ide-plugin 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 4d 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-ide-plugin/SKILL.md · 90 lines

How it starts

The opening of the file, as written. The whole thing — 90 lines — stays where its author put it; the contents beside it link to each section on GitHub.

MPS IDE Plugin Language

This skill covers IDE plugins: code that integrates with the MPS/IntelliJ host IDE — menu actions, tool windows, shortcuts, settings panels. Plugin code lives in a regular Solution module (compilation mode: "Regular MPS module contributing extensions to MPS") with model(s) using jetbrains.mps.lang.plugin and jetbrains.mps.lang.plugin.standalone. The canonical model name is <solution_name>.plugin — MPS auto-registers it on that convention.

Official documentation: https://www.jetbrains.com/help/mps/plugin.html

Critical Directives

Disambiguate the overloaded vocabulary first. "Plugin", "tool", "action group" each mean two or three different things. See references/terminology.md before naming anything.
A plugin solution is NOT an IntelliJ plugin jar. The solution contains MPS models; the jar is what the MPS Build Language packages from it. Don't conflate.
A Tool is a tool window — a dockable panel — not a CLI tool or an action.
Use MPS MCP tools for edits. mps_mcp_insert_root_node_from_json, mps_mcp_update_node, mps_mcp_print_node. Resolve concept names with mps_mcp_search_concepts / mps_mcp_get_concept_details; never guess.
ModificationStatement.modifiedGroup is a node reference (r:...), not a concept reference (c:...). Look up the target group via mps_mcp_search_root_node_by_name to obtain the node ref.
Add a model dependency on jetbrains.mps.ide.actions before referencing built-in groups (MainMenu, EditorPopup, NodeActions, ModelActions, ModuleActions, MainToolbar, ProjectViewPopupMenu).
Pick requiredAccess deliberately: none (no model touch), read (safe traversal), command (mutates with undo + write lock — never open modal dialogs from here), editorCommand (correct undo scope for editor-driven edits).
Don't call project.tool<…> from dispose. The lookup can fail during teardown.
Mac keymap trap: with Keymap = Default, MPS translates ctrl → cmd on macOS. If you specifically want ctrl on Mac, add a separate Mac_OS_X KeymapChangesDeclaration.
After edits, rebuild the module (mps_mcp_alter_nodes MAKE) so generated Java is current, then Reload All in MPS for hot-load.
Validate every new root with mps_mcp_check_root_node_problems.

Read the full file on GitHub · 90 lines

Files

What ships with it

13 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.

4d ago First seen · 90 lines · 209 tokens per session scan A fc961af0d677

Subscribe to this mod's changes

mps-ide-plugin is a skill published in the GitHub repository JetBrains/MPS (1,658 stars, last pushed today), licensed Apache-2.0. It adds 209 tokens to every session and 3,449 once invoked, about $0.0010 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.

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mps-ide-plugin