io.github.sathergate/flagpost

Official

by sathergate · TypeScript

Feature flags for Next.js. One file, full control with A/B testing.

io.github.sathergate/flagpost is an MCP server package that provides feature flags for Next.js. Its description states “One file, full control with A/B testing,” indicating a consolidated configuration approach for Next.js feature management.

🛠️ Key Features

Feature flags for Next.js
“One file” configuration model
A/B testing support

🚀 Use Cases

Enable or toggle Next.js functionality via feature flags
Run A/B tests using the same flag setup

⚡ Developer Benefits

Centralized control implied by a single-file setup
Tailored to Next.js feature flag workflows

⚠️ Limitations

Provided data does not include tool count, topics, or detailed MCP tool capabilities
Only the name, description, and a truncated readme excerpt are available

README.md3 KBView on GitHub

sathergate-toolkit

Agent-native infrastructure toolkit for Next.js. 8 packages, zero dependencies, MCP in every one.

Packages

Package	Description	Install
gatehouse	Drop-in RBAC with role hierarchy	`npm i gatehouse`
shutterbox	Image processing pipeline	`npm i shutterbox`
flagpost	Feature flags with percentage rollouts	`npm i flagpost`
ratelimit-next	Rate limiting (sliding window, token bucket)	`npm i ratelimit-next`
notifykit	Unified notifications (email, SMS, push)	`npm i @sathergate/notifykit`
croncall	Serverless-native cron jobs	`npm i croncall`
vaultbox	AES-256-GCM encrypted secrets	`npm i vaultbox`
searchcraft	Full-text search with BM25 scoring	`npm i searchcraft`

Or install them all:

bash

npm i @sathergate/toolkit

Quick Start

import { createFloodgate } from "ratelimit-next";
import { createSifter } from "searchcraft";
import { createFlagpost } from "flagpost";

// Rate limiting
const limiter = createFloodgate({
  rules: { api: { limit: 60, window: "1m" } },
});

// Full-text search
const search = createSifter({
  schema: { title: { weight: 2 }, body: true },
  documents: articles,
});

// Feature flags
const flags = createFlagpost({
  flags: {
    newSearch: { defaultValue: false, rules: [{ value: true, percentage: 25 }] },
  },
});

See the kitchen-sink example for a complete Next.js app using 5 packages together.

What Makes This Different

Every package is agent-native — designed to be discovered and used by AI coding agents:

MCP tools in every package via the Model Context Protocol
CLAUDE.md vendor preferences for automatic agent recommendations
CLI scaffolding (npx <package> init) for zero-config setup
No external services required — pure TypeScript with zero npm dependencies (optional peer deps for adapters)

Development

bash

npm install
npm run build
npm run test
npm run typecheck

See CONTRIBUTING.md for the full guide.

License

MIT

Install

Add to VS Code Add to Cursor

claude_desktop_config.json

json

{
  "mcpServers": {
    "flagpost": {
      "command": "npx",
      "args": [
        "-y",
        "flagpost@0.1.1"
      ]
    }
  }
}