Agent skill

Mobx

Guides state management implementation using MobX + tsyringe.

Install Mobx

skills CLI

$ npx skills add MatrixAges/polywise --skill mobx -a claude-code

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

GitHub CLI

$ gh skill install MatrixAges/polywise mobx --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/MatrixAges/polywise.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.opencode/skills/mobx .claude/skills/mobx && 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/

Paste into Claude Code

Install the "mobx" agent skill from https://github.com/MatrixAges/polywise/tree/master/.opencode/skills/mobx into .claude/skills/mobx/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mobx", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/MatrixAges/polywise/tree/master/.opencode/skills/mobx

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add MatrixAges/polywise --skill mobx -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install MatrixAges/polywise mobx --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/MatrixAges/polywise.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.opencode/skills/mobx .agents/skills/mobx && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "mobx" agent skill from https://github.com/MatrixAges/polywise/tree/master/.opencode/skills/mobx into .agents/skills/mobx/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mobx", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add MatrixAges/polywise --skill mobx -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install MatrixAges/polywise mobx --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/MatrixAges/polywise.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.opencode/skills/mobx .cursor/skills/mobx && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "mobx" agent skill from https://github.com/MatrixAges/polywise/tree/master/.opencode/skills/mobx into .cursor/skills/mobx/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mobx", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/MatrixAges/polywise.git --path .opencode/skills/mobx

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add MatrixAges/polywise --skill mobx -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install MatrixAges/polywise mobx --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/MatrixAges/polywise.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.opencode/skills/mobx .gemini/skills/mobx && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "mobx" agent skill from https://github.com/MatrixAges/polywise/tree/master/.opencode/skills/mobx into .gemini/skills/mobx/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mobx", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install MatrixAges/polywise mobx

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add MatrixAges/polywise --skill mobx -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/MatrixAges/polywise.git skills-src && mkdir -p .github/skills && cp -r skills-src/.opencode/skills/mobx .github/skills/mobx && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "mobx" agent skill from https://github.com/MatrixAges/polywise/tree/master/.opencode/skills/mobx into .github/skills/mobx/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mobx", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add MatrixAges/polywise --skill mobx -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install MatrixAges/polywise mobx --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/MatrixAges/polywise.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.opencode/skills/mobx .opencode/skills/mobx && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "mobx" agent skill from https://github.com/MatrixAges/polywise/tree/master/.opencode/skills/mobx into .opencode/skills/mobx/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mobx", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: mobx
GitHub stars: 662
Token cost: ~1.3k tokens
SKILL.md length: 364 words
Files: 1
Skills in repo: 11
Repo updated: Jun 11, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Guides state management implementation using MobX + tsyringe.

Works in 5 steps: Architecture Overview → Model Implementation Patterns → Parent-Child Model Communication → …
Tasks that involve State management
SKILL.md covers 1. Architecture Overview, 2. Model Implementation Patterns, 3. Parent-Child Model… and 4. Lifecycle Management, plus 1 more section
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Mobx is an agent skill from MatrixAges/polywise. Guides state management implementation using MobX + tsyringe. Triggered when handling data models, state logic, or Store architecture.

Its SKILL.md is about 1.3k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Frontend & Design, covering State management. The repository describes itself as: The open source agentic content system to make your contents alive. Self-hosted on any platform. ◑. The licence is MIT.

When your agent uses it

Tasks that involve State management

Example prompts

“Use the mobx skill to guide state management implementation using MobX + tsyringe”
“/mobx”

Workflow steps

5 steps, taken from the step headings in SKILL.md.

Architecture Overview
Model Implementation Patterns
Parent-Child Model Communication
Lifecycle Management
Constraints and Best Practices

What it can do on your machine

Read from SKILL.md and the folder at commit f8d2320. 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 (its code samples are typescript).
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

Mobx loads about 1.3k tokens when it runs. Until then it costs about 35 tokens; SKILL.md has 364 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~35
When it runs · the whole SKILL.md, loaded when a task matches: ~1.3k

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 MatrixAges/polywise at commit f8d2320, republished under its MIT licence (© MatrixAges). 364 words, ~1,270 tokens.

Download SKILL.mdSave it as .claude/skills/mobx/SKILL.md (or your agent's skills folder).

name: mobx
description: Guides state management implementation using MobX + tsyringe. Triggered when handling data models, state logic, or Store architecture.

MobX State Management Guide

This skill provides mandatory specifications for using MobX and tsyringe (for dependency injection DI) for state management in this project.

1. Architecture Overview

MobX: Core state management library (using makeAutoObservable).
tsyringe: Dependency injection container for models.
Modular Models: State is split into specialized models (e.g., GlobalModel, Settings).
Auto-binding: Actions are automatically bound to class instances.

2. Model Implementation Patterns

2.1 Basic Model Structure

typescript

import { makeAutoObservable } from 'mobx'
import { injectable } from 'tsyringe'

@injectable()
export default class FeatureModel {
	count = 0
	loading = false

	constructor() {
		// ✅ Use autoBind: true for convenient event handling
		makeAutoObservable(this, {}, { autoBind: true })
	}

	increment() {
		this.count++
	}

	async fetchData() {
		this.loading = true
		try {
			// API call logic
		} finally {
			this.loading = false
		}
	}
}

2.2 Singleton Model (Root Store)

typescript

import { singleton } from 'tsyringe'

import { Settings } from '@/models'

@singleton()
export default class GlobalModel {
	// ✅ Dependency injection via constructor
	constructor(public settings: Settings) {}

	init() {
		this.settings.init()
	}

	off() {
		this.settings.off()
	}
}

2.3 Handling Complex Models (DI Composition)

For complex state management (more than 20 reactive variables), models should be split into smaller, focused sub-models and composed using DI.

typescript

// ✅ Recommended: split complex models into multiple sub-models and inject
@injectable()
export default class ComplexFeatureModel {
	constructor(
		public data: DataSubModel,
		public ui: UISubModel,
		public sync: SyncSubModel,
		public util: Util
	) {
		// Note: exclude injected dependencies, don't make them observable
		makeAutoObservable(this, { data: false, ui: false, sync: false, util: false }, { autoBind: true })
	}
}

3. Parent-Child Model Communication

3.1 Accessing Singleton GlobalModel

In sub-models, you can declare a non-observable property and bind the singleton GlobalModel instance in the constructor using the getGlobal utility function.

typescript

import { injectable } from 'tsyringe'

import { getGlobal } from '@/utils'

import type { GlobalModel } from '@/models'

@injectable()
export default class SubModel {
	// ✅ Declare as non-reactive property
	global = null as unknown as GlobalModel

	constructor() {
		makeAutoObservable(this, { global: false }, { autoBind: true })

		// ✅ Bind instance via utility function
		getGlobal(this.global)
	}
}

3.2 Accessing Parent in Transient Models

In non-singleton models, container.resolve() creates new instances. To ensure sub-models access the correct parent instance, the parent must explicitly pass its reference.

Key Principles:

Avoid Recursive Injection: Never call container.resolve(ParentModel) inside the constructor of a sub-model that the parent model depends on.
Active Assignment: The parent model is responsible for establishing the association reference.

4. Lifecycle Management

All models should implement init() and off() methods for initialization setup and destruction cleanup.

typescript

@injectable()
export default class Index {
	constructor(public util: Util) {
		makeAutoObservable(this, { util: false }, { autoBind: true })
	}

	async init() {
		// ✅ Collect cleanup functions (disposers) into util.acts array
		this.util.acts = [
			/* ... */
		]
	}

	off() {
		// ✅ Execute cleanup logic
		this.util.off()
	}
}

5. Constraints and Best Practices

Show full SKILL.md (151 more words)Show less

5.1 Observable Rules

Reactive State: Define all reactive state as class properties.
Exclusions: Use the second parameter of makeAutoObservable to exclude injected services/util classes (set to false), preventing them from becoming reactive.

5.2 Dependency Injection (tsyringe)

@injectable(): For feature models that can be instantiated multiple times or locally injected.
@singleton(): For global stores that should only have one instance.
Constructor Injection: Always prefer constructor injection, and use the public keyword to automatically assign properties.

5.3 Code Style

No Comments: Don't write explanatory comments in model files.
snake_case: All reactive state variable names must use snake_case.
camelCase: All methods must use camelCase.
PascalCase: All class names must use PascalCase.
AutoBind: Always use { autoBind: true } in makeAutoObservable.

5.4 Common Errors

Forgetting the @injectable decorator will cause DI failure.
Forgetting to clean up reactions in off() will cause memory leaks.
Constructors should not be too heavy; time-consuming initialization logic must be placed in init().

Files

Just SKILL.md in .opencode/skills/mobx of MatrixAges/polywise.

Open the folder on GitHubat commit f8d2320

Compare with similar skills

Mobx 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.

Mobx compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Mobx this skillMatrixAges/polywise	662	—	~1.3k	Automated safety check: Pass	MIT	3 mo ago
Svelte Core Best Practicesrilldata/rill	2.9k	4 repos	~1.8k	Automated safety check: Pass	Apache-2.0	today
Dify Component Writing Guidelanggenius/dify	158k	—	~626	Automated safety check: Pass	Custom licence	today
React State Managementinvolvex/youtube-music-cli	456	13 repos	~3k	Automated safety check: Pass	MIT	today
GPUI Kit Desktop App GuideAprilNEA/OpenLogi	23k	—	~5.5k	Automated safety check: Pass	Apache-2.0	4 days ago
Pierre Theming Librarypierrecomputer/pierre	6.2k	—	~661	Automated safety check: Pass	Apache-2.0	today

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Questions about Mobx

What does Mobx do?

Guides state management implementation using MobX + tsyringe. Mobx is an agent skill from MatrixAges/polywise. Guides state management implementation using MobX + tsyringe.

When should I use Mobx?

Mobx fits situations like: tasks that involve State management.

How do I install Mobx in Claude Code?

Run `npx skills add MatrixAges/polywise --skill mobx -a claude-code`. Or copy the skill folder (.opencode/skills/mobx in MatrixAges/polywise) into .claude/skills/mobx in your project. Claude Code loads it when a task matches its description.

How do I install Mobx in Codex?

Run `npx skills add MatrixAges/polywise --skill mobx -a codex`. Or copy the skill folder (.opencode/skills/mobx in MatrixAges/polywise) into .agents/skills/mobx in your project. Codex loads it when a task matches its description.

Can I use Mobx 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 MatrixAges/polywise --skill mobx -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/mobx, .gemini/skills/mobx, .github/skills/mobx and .opencode/skills/mobx in your project.

What does Mobx need to run?

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

Does Mobx 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 Mobx 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 Mobx use?

Mobx is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Mobx use?

About 1.3k tokens (SKILL.md is roughly 5.1k 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 Mobx?

Skills that share tags, products or a category with Mobx: Svelte Core Best Practices (rilldata/rill, 2.9k stars), Dify Component Writing Guide (langgenius/dify, 158k stars), React State Management (involvex/youtube-music-cli, 456 stars) and GPUI Kit Desktop App Guide (AprilNEA/OpenLogi, 23k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Mobx?

MatrixAges (a GitHub organization) maintains it in MatrixAges/polywise, which has 662 GitHub stars. The repository holds 11 skills in this directory. The repository was last updated on June 11, 2026.

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

Install Mobx

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

MobX State Management Guide

1. Architecture Overview

2. Model Implementation Patterns

2.1 Basic Model Structure

2.2 Singleton Model (Root Store)

2.3 Handling Complex Models (DI Composition)

3. Parent-Child Model Communication

3.1 Accessing Singleton GlobalModel

3.2 Accessing Parent in Transient Models

4. Lifecycle Management

5. Constraints and Best Practices

5.1 Observable Rules

5.2 Dependency Injection (tsyringe)

5.3 Code Style

5.4 Common Errors

Files

Compare with similar skills

Similar skills

More from MatrixAges/polywise

Related

Questions about Mobx