Agent skill

Feature Flags

by BuilderIO in BuilderIO/agent-native

Declare, evaluate, manage, and remove framework feature flags.

No licenceAuto-check passed

Install Feature Flags

skills CLI
$ npx skills add BuilderIO/agent-native --skill feature-flags -a claude-code

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

GitHub CLI
$ gh skill install BuilderIO/agent-native feature-flags --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/BuilderIO/agent-native.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/feature-flags .claude/skills/feature-flags && 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
feature-flags
GitHub stars
7.1k
Token cost
~1.9k tokens
SKILL.md length
862 words
Files
1
Skills in repo
102
Repo updated
First seen
Licence
None found

At a glance

Declare, evaluate, manage, and remove framework feature flags.

  • Works in 4 steps: Declare → Register → Guard server and client → …
  • Shipping a capability gradually
  • SKILL.md covers When to use one, Agent workflow, Management contract and Rollout semantics, plus 3 more sections
  • Calls pnpm

What it does

Feature Flags is an agent skill from BuilderIO/agent-native. Declare, evaluate, manage, and remove framework feature flags. Use when shipping a capability gradually, targeting users or organizations, or replacing a compile-time rollout switch with a production-safe runtime flag.

Its SKILL.md is about 1.9k 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

  • Shipping a capability gradually
  • Targeting users
  • Replacing a compile-time rollout switch with a production-safe runtime flag

Example prompts

  • “/feature-flags”

Workflow steps

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

  1. Declare
  2. Register
  3. Guard server and client
  4. Verify and roll out

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

    Shell commands in SKILL.md call:

    • pnpm

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md. Its commands use pnpm, which can reach the network depending on how they are called.

    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

Feature Flags loads about 1.9k tokens when it runs. Until then it costs about 58 tokens; SKILL.md has 862 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~58
When it runs · the whole SKILL.md, loaded when a task matches
~1.9k

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 862 words (~1,859 tokens).

“A feature flag is a boolean declared in app code, evaluated locally by Core, and managed from the Analytics fleet control plane. Code owns whether a flag exists. Runtime settings own only its rollout state.”

— opening of SKILL.md by BuilderIO
name
feature-flags
scope
dev
metadata.internal
true

Read the full SKILL.md on GitHub

Files

Just SKILL.md in .agents/skills/feature-flags of BuilderIO/agent-native.

Open the folder on GitHubat commit e16da0c

Compare with similar skills

Feature Flags 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.

Feature Flags compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Feature Flags this skillBuilderIO/agent-native7.1k—~1.9kAutomated safety check: PassNone
Warp Feature Flag Removalwarpdotdev/warp65k1 repos~1.1kAutomated safety check: PassAGPL-3.0
Remove Option Or Flaggetsentry/sentry46k—~3kAutomated safety check: PassCustom licence
Remove Feature Flagandroidx/androidx6.1k—~1.2kAutomated safety check: PassApache-2.0
Flagsvercel/next.js143k—~746Automated safety check: PassMIT
Arize Evaluatorgithub/awesome-copilot40k2 repos~8.1kAutomated safety check: NotesMIT

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  • Removes a Warp feature flag once it is stable for everyone, deleting the definition, the Cargo entries and every conditional check.

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  • Remove Option Or Flag

    getsentry/sentry

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    androidx/androidx

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  • Flags

    vercel/next.js

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    How to add or modify Next.js experimental feature flags end-to-end.

    143k GitHub stars~746 tokensUpdated today
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  • Arize Evaluator

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Questions about Feature Flags

What does Feature Flags do?

Declare, evaluate, manage, and remove framework feature flags. Feature Flags is an agent skill from BuilderIO/agent-native. Declare, evaluate, manage, and remove framework feature flags.

When should I use Feature Flags?

Feature Flags fits situations like: shipping a capability gradually; targeting users; replacing a compile-time rollout switch with a production-safe runtime flag.

How do I install Feature Flags in Claude Code?

Run `npx skills add BuilderIO/agent-native --skill feature-flags -a claude-code`. Or copy the skill folder (.agents/skills/feature-flags in BuilderIO/agent-native) into .claude/skills/feature-flags in your project. Claude Code loads it when a task matches its description.

How do I install Feature Flags in Codex?

Run `npx skills add BuilderIO/agent-native --skill feature-flags -a codex`. Or copy the skill folder (.agents/skills/feature-flags in BuilderIO/agent-native) into .agents/skills/feature-flags in your project. Codex loads it when a task matches its description.

Can I use Feature Flags 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 feature-flags -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/feature-flags, .gemini/skills/feature-flags, .github/skills/feature-flags and .opencode/skills/feature-flags in your project.

What does Feature Flags need to run?

Going by SKILL.md and its folder, Feature Flags needs the command-line tools its instructions call (pnpm).

Does Feature Flags 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 Feature Flags 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 Feature Flags use?

No licence was found for Feature Flags or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.

How many tokens does Feature Flags use?

About 1.9k tokens (SKILL.md is roughly 7.4k 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 Feature Flags?

Skills that share tags, products or a category with Feature Flags: Warp Feature Flag Removal (warpdotdev/warp, 65k stars), Remove Option Or Flag (getsentry/sentry, 46k stars), Remove Feature Flag (androidx/androidx, 6.1k stars) and Flags (vercel/next.js, 143k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Feature Flags?

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.