# Feature Flags

> Feature flags and toggles management. Trigger when the user wants to implement feature flagging, A/B testing, or progressive deployment.

- **Type:** Skill
- **Install:** `agentstack add skill-christopherlouet-claude-base-feature-flags`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [christopherlouet](https://agentstack.voostack.com/s/christopherlouet)
- **Installs:** 0
- **Category:** [AI & ML](https://agentstack.voostack.com/c/ai-and-ml)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [christopherlouet](https://github.com/christopherlouet)
- **Source:** https://github.com/christopherlouet/claude-base/tree/main/.claude/skills/feature-flags
- **Website:** https://christopherlouet.github.io/claude-base/

## Install

```sh
agentstack add skill-christopherlouet-claude-base-feature-flags
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# Feature Flags (pointer)

SDK code, targeting rules syntax and dashboard integration drift on each vendor release and are canonical at:

- **LaunchDarkly** — [launchdarkly.com/docs](https://launchdarkly.com/docs) (SaaS, advanced targeting + experimentation)
- **Unleash** — [docs.getunleash.io](https://docs.getunleash.io) (self-hosted open source)
- **ConfigCat** — [configcat.com/docs](https://configcat.com/docs) (SaaS, generous free tier)
- **PostHog Feature Flags** — [posthog.com/docs/feature-flags](https://posthog.com/docs/feature-flags) (paired with product analytics; see also recipe)
- **OpenFeature** — [openfeature.dev](https://openfeature.dev) (vendor-neutral SDK standard — use to avoid lock-in)

## Use-case taxonomy (version-agnostic)

| Type | Purpose | Lifetime |
|---|---|---|
| **Release toggle** | Deploy inactive code; flip on after smoke test | Short (days/weeks) |
| **Experiment toggle** | A/B test; emits exposure events for analysis | Bounded by experiment duration |
| **Ops toggle** | Circuit breakers, kill switches, degraded modes | Long-lived |
| **Permission toggle** | Feature gating by role/plan/cohort | Permanent (treat like config) |

Choose by lifetime: short → cheap implementation, long-lived → invest in observability + naming discipline.

## Foundation discipline (keep across releases)

- **Default OFF**: every flag defaults to its conservative value (usually off). A flag that ships defaulting to ON is a hidden behaviour change.
- **2-sprint rule**: remove release toggles within 2 sprints of full rollout. Stale flags accrue as tech debt — surface them via `qa-tech-debt`.
- **Log every evaluation**: missing evaluation logs make debugging "why did user X see variant Y" impossible. Vendor SDKs offer this; if rolling custom, log it.
- **No business logic in flag values**: a flag is a boolean (or enum); complex conditions belong in code paths the flag selects, not inside the flag service.
- **Naming convention**: `__` (e.g. `checkout_express_enabled`). Scope-first sorts/filters cleanly in dashboards.

## See also

- `growth-ab-test` skill — experiment design, sample-size, exposure analysis (consumes experiment toggles)
- `qa-tech-debt` — flag-debt scan surfaces stale flags past the 2-sprint window
- `dev-tdd` — flag-gated code paths must be tested in BOTH states (on/off), not just the new path

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [christopherlouet](https://github.com/christopherlouet)
- **Source:** [christopherlouet/claude-base](https://github.com/christopherlouet/claude-base)
- **License:** MIT
- **Homepage:** https://christopherlouet.github.io/claude-base/

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-christopherlouet-claude-base-feature-flags
- Seller: https://agentstack.voostack.com/s/christopherlouet
- Browse the marketplace: https://agentstack.voostack.com/browse

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Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.