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Flagpost MCP server

by sathergate·io.github.sathergate/flagpost·v0.1.1·109 stars
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Feature flags for Next.js. One file, full control with A/B testing.

A92/100grade A
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Safety scan
A92/100

full report

Adoption
Growing

109 stars

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If you have run it, two minutes of your experience saves the next person an afternoon.

Flagpost tools (3, 1 write)

write = sends, deletes, buys or posts

Read from the package source without running it. The installed server may list more.

  • flagpost_add_flag

    Adds a new feature flag definition to an existing flagpost.config.ts file.

  • flagpost_initwrite action

    Creates flagpost.config.ts in a project directory. Scaffolds a starter config with an example feature flag.

  • flagpost_list_flags

    Lists all feature flags defined in a flagpost.config.ts file, showing their names and default values.

Public scan report

scanner v0.1.9 · 2026-09-27 · same rubric, same numbers if you re-run it

no findings
  • Code scan12 source files scanned25/25
  • –Live reliabilityno gateway calls yet and no remote to proben/a
  • –Tool poisoningtools not inspected (local package is not executed); not countedn/a
  • Auth qualitylocal package, no credentials required12/15
  • Maintenancelast push 17 days ago15/15
  • Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10
Overall 92/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

Install Flagpost in Claude Code, Cursor or VS Code

Runs npx -y flagpost on your machine. Read the scan report first; the gateway never runs local packages.

claude mcp add flagpost -- npx -y flagpost
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What the publisher says

From the Flagpost repository's README, as published. We do not edit it. Read it on GitHub

sathergate-toolkit

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

Packages

Or install them all:

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 init) for zero-config setup
  • No external services required — pure TypeScript with zero npm dependencies (optional peer deps for adapters)

Development

npm install
npm run build
npm run test
npm run typecheck

See CONTRIBUTING.md for the full guide.

License

MIT

Nothing above is checked by us. What we check is on the safety report.

Flagpost: common questions

Is Flagpost MCP server safe?
Yes, by our scan: it is graded A (92/100). Read the Flagpost safety report
How do I install Flagpost?
It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does Flagpost need an API key?
Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is Flagpost maintained?
The last commit was 17 days ago (2026-09-11). The latest release is v0.1.1.

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