Agent skill

New Extension

Scaffold a new Yontrack extension end-to-end — module, feature descriptor, service, GraphQL, migration, tests, and UI.

Install New Extension

skills CLI

$ npx skills add yontrack/yontrack --skill new-extension -a claude-code

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

GitHub CLI

$ gh skill install yontrack/yontrack new-extension --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/yontrack/yontrack.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/new-extension .claude/skills/new-extension && 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 "new-extension" agent skill from https://github.com/yontrack/yontrack/tree/main/.claude/skills/new-extension into .claude/skills/new-extension/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "new-extension", 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/yontrack/yontrack/tree/main/.claude/skills/new-extension

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 yontrack/yontrack --skill new-extension -a codex

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

GitHub CLI

$ gh skill install yontrack/yontrack new-extension --agent codex

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

Manual copy

$ git clone --depth 1 https://github.com/yontrack/yontrack.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/new-extension .agents/skills/new-extension && 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 "new-extension" agent skill from https://github.com/yontrack/yontrack/tree/main/.claude/skills/new-extension into .agents/skills/new-extension/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "new-extension", 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 yontrack/yontrack --skill new-extension -a cursor

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

GitHub CLI

$ gh skill install yontrack/yontrack new-extension --agent cursor

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

Manual copy

$ git clone --depth 1 https://github.com/yontrack/yontrack.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/new-extension .cursor/skills/new-extension && 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 "new-extension" agent skill from https://github.com/yontrack/yontrack/tree/main/.claude/skills/new-extension into .cursor/skills/new-extension/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "new-extension", 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/yontrack/yontrack.git --path .claude/skills/new-extension

--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 yontrack/yontrack --skill new-extension -a gemini-cli

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

GitHub CLI

$ gh skill install yontrack/yontrack new-extension --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/yontrack/yontrack.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/new-extension .gemini/skills/new-extension && 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 "new-extension" agent skill from https://github.com/yontrack/yontrack/tree/main/.claude/skills/new-extension into .gemini/skills/new-extension/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "new-extension", 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 yontrack/yontrack new-extension

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 yontrack/yontrack --skill new-extension -a github-copilot

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

Manual copy

$ git clone --depth 1 https://github.com/yontrack/yontrack.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/new-extension .github/skills/new-extension && 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 "new-extension" agent skill from https://github.com/yontrack/yontrack/tree/main/.claude/skills/new-extension into .github/skills/new-extension/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "new-extension", 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 yontrack/yontrack --skill new-extension -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 yontrack/yontrack new-extension --agent opencode

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

Manual copy

$ git clone --depth 1 https://github.com/yontrack/yontrack.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/new-extension .opencode/skills/new-extension && 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 "new-extension" agent skill from https://github.com/yontrack/yontrack/tree/main/.claude/skills/new-extension into .opencode/skills/new-extension/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "new-extension", 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: new-extension
GitHub stars: 102
Token cost: ~1k tokens
SKILL.md length: 315 words
Files: 1
Skills in repo: 7
Repo updated: Oct 9, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Scaffold a new Yontrack extension end-to-end — module, feature descriptor, service, GraphQL, migration, tests, and UI.

Works in 10 steps: Create the Gradle module → Define the feature descriptor → Implement the core extension class → …
Asked to create a new extension
SKILL.md covers Step 1 — Create the Gradle…, Step 2 — Define the feature…, Step 3 — Implement the core… and Step 4 — Add service interface…, plus 6 more sections
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

New Extension is an agent skill from yontrack/yontrack. Scaffold a new Yontrack extension end-to-end — module, feature descriptor, service, GraphQL, migration, tests, and UI. Use when asked to create a new extension or add a new feature module.

Its SKILL.md is about 1k 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 Backend & APIs, covering GraphQL. It works with GraphQL, Gradle and Java. The repository describes itself as: Continuous delivery monitoring. The licence is MIT.

When your agent uses it

Asked to create a new extension
Add a new feature module

Example prompts

“/new-extension”

Workflow steps

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

Create the Gradle module
Define the feature descriptor
Implement the core extension class
Add service interface and implementation
Add GraphQL SDL and resolver
Add Flyway migration (if new tables needed)
Write unit tests
Write integration tests
Add frontend UI components (if property types or pages are involved)
Final checklist

What it can do on your machine

Read from SKILL.md and the folder at commit bfba3ca. 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 kotlin).
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

New Extension loads about 1k tokens when it runs. Until then it costs about 51 tokens; SKILL.md has 315 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~51
When it runs · the whole SKILL.md, loaded when a task matches: ~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 yontrack/yontrack at commit bfba3ca, republished under its MIT licence (© yontrack). 315 words, ~1,010 tokens.

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

name: new-extension
description: Scaffold a new Yontrack extension end-to-end — module, feature descriptor, service, GraphQL, migration, tests, and UI. Use when asked to create a new extension or add a new feature module.
user-invocable: true

/new-extension — Scaffold a New Yontrack Extension

Arguments passed: $ARGUMENTS

Parse $ARGUMENTS for the extension name (e.g. my-feature). If not provided, ask the user for:

Extension name (kebab-case, e.g. my-feature)
Short description (one sentence)
Whether it needs a new database table

Then execute the following steps in order, confirming with the user before creating files.

Step 1 — Create the Gradle module

Create ontrack-extension-{name}/build.gradle.kts:

kotlin

plugins {
    `java-library`
    kotlin("jvm")
    kotlin("plugin.spring")
}

description = "{Short description}"

dependencies {
    api(project(":ontrack-extension-api"))
    implementation(project(":ontrack-extension-support"))
    // add other dependencies as needed
    testImplementation(project(":ontrack-it-utils"))
}

include("ontrack-extension-{name}")

Find the existing include(...) lines and insert alphabetically.

Step 2 — Define the feature descriptor

Create src/main/java/net/nemerosa/ontrack/extension/{name}/{Name}ExtensionFeature.kt:

kotlin

package net.nemerosa.ontrack.extension.{name}

import net.nemerosa.ontrack.extension.support.AbstractExtensionFeature
import org.springframework.stereotype.Component

@Component
class {Name}ExtensionFeature : AbstractExtensionFeature(
    id = "{name}",
    name = "{Human Name}",
    description = "{Short description}",
)

Step 3 — Implement the core extension class

Create {Name}Extension.kt in the same package extending AbstractExtension and implementing the relevant extension point interface (e.g. PropertyType, EventListener, DecorationExtension).

Step 4 — Add service interface and implementation

Create {Name}Service.kt (interface) and {Name}ServiceImpl.kt annotated with @Service. Use constructor injection. Add security checks at the top of each method using securityService.

Step 5 — Add GraphQL SDL and resolver

Create src/main/resources/graphql/{name}.graphqls with the schema definition.

Create {Name}GraphQLController.kt annotated with @Controller using @QueryMapping / @MutationMapping.

Step 6 — Add Flyway migration (if new tables needed)

Find the highest existing migration number in ontrack-database/src/main/resources/db/migration/.

Create V{N+1}__{short_description}.sql. Rules:

Use SERIAL PRIMARY KEY NOT NULL for auto-increment PKs
Always add ON DELETE CASCADE on FK references to entity tables
Add indexes for FK columns

Step 7 — Write unit tests

Create src/test/java/net/nemerosa/ontrack/extension/{name}/{Name}Test.kt using MockK for mocks.

Step 8 — Write integration tests

Create src/test/java/net/nemerosa/ontrack/extension/{name}/{Name}IT.kt extending AbstractDSLTestSupport.

Step 9 — Add frontend UI components (if property types or pages are involved)

For each property type, create the directory: ontrack-web-core/components/framework/properties/net.nemerosa.ontrack.extension.{name}.{PropertyType}/

Required files: Icon.js, Display.js, Form.js. Optional: FormPrepare.js.

For new pages, add a UserMenuItemExtension on the backend and register the icon in UserMenu.js > itemIcons.

Step 10 — Final checklist

Confirm all of the following exist before finishing:

ontrack-extension-{name}/build.gradle.kts
settings.gradle.kts updated
{Name}ExtensionFeature.kt
Core extension class(es)
Service interface + @Service implementation
.graphqls SDL + @Controller resolver
Flyway migration (if needed)
Unit tests (*Test.kt)
Integration tests (*IT.kt)
Frontend UI components (if needed)

Files

Just SKILL.md in .claude/skills/new-extension of yontrack/yontrack.

Open the folder on GitHubat commit bfba3ca

Compare with similar skills

New Extension 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.

New Extension compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
New Extension this skillyontrack/yontrack	102	—	~1k	Automated safety check: Pass	MIT	today
Retrofit Graphql Build DependenciesAniTrend/retrofit-graphql	111	—	~463	Automated safety check: Pass	Apache-2.0	3 days ago
Apollo Kotlinapollographql/skills	117	—	~547	Automated safety check: Pass	MIT	2 days ago
API Testingfugazi/test-automation-skills-agents	249	—	~1.5k	Automated safety check: Pass	MIT	6 days ago
API TesterRightNow-AI/openfang	18k	—	~807	Automated safety check: Pass	Apache-2.0	3 mo ago
Nodejs Backend Patternsever-works/ever-works	162	18 repos	~4k	Automated safety check: Pass	AGPL-3.0	today

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Questions about New Extension

What does New Extension do?

Scaffold a new Yontrack extension end-to-end — module, feature descriptor, service, GraphQL, migration, tests, and UI. New Extension is an agent skill from yontrack/yontrack. Scaffold a new Yontrack extension end-to-end — module, feature descriptor, service, GraphQL, migration, tests, and UI.

When should I use New Extension?

New Extension fits situations like: asked to create a new extension; add a new feature module.

How do I install New Extension in Claude Code?

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

How do I install New Extension in Codex?

Run `npx skills add yontrack/yontrack --skill new-extension -a codex`. Or copy the skill folder (.claude/skills/new-extension in yontrack/yontrack) into .agents/skills/new-extension in your project. Codex loads it when a task matches its description.

Can I use New Extension 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 yontrack/yontrack --skill new-extension -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/new-extension, .gemini/skills/new-extension, .github/skills/new-extension and .opencode/skills/new-extension in your project.

What does New Extension need to run?

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

Does New Extension 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 New Extension 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 New Extension use?

New Extension 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 New Extension use?

About 1k tokens (SKILL.md is roughly 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 New Extension?

Skills that share tags, products or a category with New Extension: Retrofit Graphql Build Dependencies (AniTrend/retrofit-graphql, 111 stars), Apollo Kotlin (apollographql/skills, 117 stars), API Testing (fugazi/test-automation-skills-agents, 249 stars) and API Tester (RightNow-AI/openfang, 18k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains New Extension?

yontrack (a GitHub organization) maintains it in yontrack/yontrack, which has 102 GitHub stars. The repository holds 7 skills in this directory. The repository was last updated on October 9, 2026.

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

Install New Extension

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

/new-extension — Scaffold a New Yontrack Extension

Step 1 — Create the Gradle module

Step 2 — Define the feature descriptor

Step 3 — Implement the core extension class

Step 4 — Add service interface and implementation

Step 5 — Add GraphQL SDL and resolver

Step 6 — Add Flyway migration (if new tables needed)

Step 7 — Write unit tests

Step 8 — Write integration tests

Step 9 — Add frontend UI components (if property types or pages are involved)

Step 10 — Final checklist

Files

Compare with similar skills

Similar skills

More from yontrack/yontrack

Related

Questions about New Extension