Extension Points
dotnet/skills
Own MSBuild import and hook discovery. An agent skill from dotnet/skills.
How extensions render as widgets inside other apps via named UI slots — the framework's optional extension system.
No licenceAuto-check passed
Install Extension Points
$ npx skills add BuilderIO/agent-native --skill extension-points -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install BuilderIO/agent-native extension-points --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/BuilderIO/agent-native.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/extension-points .claude/skills/extension-points && rm -rf skills-srcUse ~/.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/
Install the "extension-points" agent skill from https://github.com/BuilderIO/agent-native/tree/main/.agents/skills/extension-points into .claude/skills/extension-points/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "extension-points", 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 install https://github.com/BuilderIO/agent-native/tree/main/.agents/skills/extension-pointsType 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.
$ npx skills add BuilderIO/agent-native --skill extension-points -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install BuilderIO/agent-native extension-points --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/BuilderIO/agent-native.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/extension-points .agents/skills/extension-points && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "extension-points" agent skill from https://github.com/BuilderIO/agent-native/tree/main/.agents/skills/extension-points into .agents/skills/extension-points/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "extension-points", 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.
$ npx skills add BuilderIO/agent-native --skill extension-points -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install BuilderIO/agent-native extension-points --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/BuilderIO/agent-native.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/extension-points .cursor/skills/extension-points && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "extension-points" agent skill from https://github.com/BuilderIO/agent-native/tree/main/.agents/skills/extension-points into .cursor/skills/extension-points/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "extension-points", 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 https://github.com/BuilderIO/agent-native.git --path .agents/skills/extension-points--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add BuilderIO/agent-native --skill extension-points -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install BuilderIO/agent-native extension-points --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/BuilderIO/agent-native.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/extension-points .gemini/skills/extension-points && rm -rf skills-srcUse ~/.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/
Install the "extension-points" agent skill from https://github.com/BuilderIO/agent-native/tree/main/.agents/skills/extension-points into .gemini/skills/extension-points/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "extension-points", 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.
$ gh skill install BuilderIO/agent-native extension-pointsInstalls 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).
$ npx skills add BuilderIO/agent-native --skill extension-points -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/BuilderIO/agent-native.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/extension-points .github/skills/extension-points && rm -rf skills-srcUse ~/.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/
Install the "extension-points" agent skill from https://github.com/BuilderIO/agent-native/tree/main/.agents/skills/extension-points into .github/skills/extension-points/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "extension-points", 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.
$ npx skills add BuilderIO/agent-native --skill extension-points -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install BuilderIO/agent-native extension-points --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/BuilderIO/agent-native.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/extension-points .opencode/skills/extension-points && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "extension-points" agent skill from https://github.com/BuilderIO/agent-native/tree/main/.agents/skills/extension-points into .opencode/skills/extension-points/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "extension-points", 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
extension-points- GitHub stars
- 7.1k
- Token cost
- ~2.4k tokens
- SKILL.md length
- 1,018 words
- Files
- 1
- Skills in repo
- 102
- Repo updated
- First seen
- Licence
- None found
At a glance
How extensions render as widgets inside other apps via named UI slots — the framework's optional extension system.
- Works in 3 steps: Create the extension with… → Declare the slot target with… → Install it for the current user with…
- An extension-enabled app needs to wire an ExtensionSlot
- SKILL.md covers Mental model, Slot ID convention, How to author an extension… and How to declare a slot in your…, plus 6 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Extension Points is an agent skill from BuilderIO/agent-native. How extensions render as widgets inside other apps via named UI slots — the framework's optional extension system. Use when an extension-enabled app needs to wire an ExtensionSlot or make an existing one-off custom block installable into a slot.
Its SKILL.md is about 2.4k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
The repository describes itself as: A framework for building agentic apps.
When your agent uses it
- An extension-enabled app needs to wire an ExtensionSlot
- Make an existing one-off custom block installable into a slot
Example prompts
- “/extension-points”
Workflow steps
3 steps, taken from the first numbered list in SKILL.md.
- Create the extension with create-extension. The HTML can read
- Declare the slot target with add-extension-slot-target
- Install it for the current user with install-extension
What it can do on your machine
Read from SKILL.md and the folder at commit e16da0c. 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 html and 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
Extension Points loads about 2.4k tokens when it runs. Until then it costs about 66 tokens; SKILL.md has 1,018 words of instructions outside code blocks.
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
Without a licence we can't republish the file, so here is its outline and opening line. It has 1,018 words (~2,359 tokens).
“Slots are named React-shaped holes in apps. Extensions are widgets that opt into filling those holes. The framework matches them up by string ID.”
- name
- extension-points
- metadata.internal
- true
Files
Just SKILL.md in .agents/skills/extension-points of BuilderIO/agent-native.
Open the folder on GitHubat commit e16da0c
Compare with similar skills
Extension Points 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Extension Points this skillBuilderIO/agent-native | 7.1k | — | ~2.4k | Automated safety check: Pass | None | |
| Extension Pointsdotnet/skills | 5.6k | 1 repos | ~2.9k | Automated safety check: Pass | MIT | |
| Extension Pointsmicrosoft/testfx | 1k | — | ~2.6k | Automated safety check: Pass | MIT | |
| Browser Extension Buildersickn33/agentic-awesome-skills | 47k | 2 repos | ~2.3k | Automated safety check: Pass | MIT | |
| Browser Extension Launchsickn33/agentic-awesome-skills | 47k | 1 repos | ~1.4k | Automated safety check: Pass | MIT | |
| Browser Extension Reversesickn33/agentic-awesome-skills | 47k | 1 repos | ~695 | Automated safety check: Pass | MIT |
Similar skills
- Official
- Official
Extension Points
microsoft/testfx
Guide for MSBuild extensibility: CustomBefore/CustomAfter hooks, wildcard imports with alphabetic ordering, import gating with control properties, NuGet package build extension layout…
Browser Extension Builder
sickn33/agentic-awesome-skills
Expert in building browser extensions that solve real problems - Chrome, Firefox, and cross-browser extensions.
Browser Extension Launch
sickn33/agentic-awesome-skills
Builds, tests, packages, and prepares Chrome extensions for store launch from a plain-language idea; use for new extensions, fixes, releases, and submission recovery.
Browser Extension Reverse
sickn33/agentic-awesome-skills
Authorized reverse engineering of Chrome/Firefox extensions: manifest analysis, background workers, content scripts, and extension-based credential or data-exposure research.
Browser Extension Reverse
zhaoxuya520/reverse-skill
A skill your agent uses for authorized reverse engineering of browser extensions (Chrome/Firefox) including manifest analysis, background workers, and extension-based credential or traffic logic…
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Questions about Extension Points
What does Extension Points do?
How extensions render as widgets inside other apps via named UI slots — the framework's optional extension system. Extension Points is an agent skill from BuilderIO/agent-native. How extensions render as widgets inside other apps via named UI slots — the framework's optional extension system.
When should I use Extension Points?
Extension Points fits situations like: an extension-enabled app needs to wire an ExtensionSlot; make an existing one-off custom block installable into a slot.
How do I install Extension Points in Claude Code?
Run `npx skills add BuilderIO/agent-native --skill extension-points -a claude-code`. Or copy the skill folder (.agents/skills/extension-points in BuilderIO/agent-native) into .claude/skills/extension-points in your project. Claude Code loads it when a task matches its description.
How do I install Extension Points in Codex?
Run `npx skills add BuilderIO/agent-native --skill extension-points -a codex`. Or copy the skill folder (.agents/skills/extension-points in BuilderIO/agent-native) into .agents/skills/extension-points in your project. Codex loads it when a task matches its description.
Can I use Extension Points 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 BuilderIO/agent-native --skill extension-points -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/extension-points, .gemini/skills/extension-points, .github/skills/extension-points and .opencode/skills/extension-points in your project.
What does Extension Points need to run?
SKILL.md names no scripts, command-line tools or credentials: Extension Points is instructions for the agent only.
Does Extension Points 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 Extension Points 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 Extension Points use?
No licence was found for Extension Points or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Extension Points use?
About 2.4k tokens (SKILL.md is roughly 9.4k 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 Extension Points?
Skills that share tags, products or a category with Extension Points: Extension Points (dotnet/skills, 5.6k stars), Extension Points (microsoft/testfx, 1k stars), Browser Extension Builder (sickn33/agentic-awesome-skills, 47k stars) and Browser Extension Launch (sickn33/agentic-awesome-skills, 47k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Extension Points?
BuilderIO (a GitHub organization) maintains it in BuilderIO/agent-native, which has 7,087 GitHub stars. The repository holds 102 skills in this directory. The repository was last updated on October 8, 2026.
Source: BuilderIO/agent-native on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.