What is wingify-fe-mcp?

A guide for developing and operating a Wingify Feature Experimentation MCP server, a service that lets tools manage feature flags and experiment rules.

Managing feature flags, integrating SDKs, migrating experiments from Statsig, and developing or building the Wingify MCP server.

It provides the project-specific names, environment settings, API details, and migration rules needed to work on this server correctly.

wingify-fe-mcp — Skill for Claude Code and Codex by wingify

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add wingify/wingify-fme-mcp --skill wingify-fe-mcp

Clone the repo

git clone --depth 1 https://github.com/wingify/wingify-fme-mcp

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/wingify/wingify-fme-mcp/wingify-fe-mcp/github.svg)](https://agentmods.dev/skills/wingify/wingify-fme-mcp/wingify-fe-mcp)

Your own site

<a href="https://agentmods.dev/skills/wingify/wingify-fme-mcp/wingify-fe-mcp"><img src="https://agentmods.dev/badge/skills/wingify/wingify-fme-mcp/wingify-fe-mcp/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/wingify/wingify-fme-mcp/wingify-fe-mcp"><img src="https://agentmods.dev/badge/skills/wingify/wingify-fme-mcp/wingify-fe-mcp.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 78 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,136 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00078	$0.02136
Opus 5	$0.00039	$0.01068
Sonnet 5	$0.00016	$0.00427
Haiku 4.5	$0.00008	$0.00214

Measured 10d ago against content hash 5ce8637bbfc3, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

wingify-fe-mcp scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/wingify-fe-mcp/SKILL.md · 156 lines

How it starts

The opening of the file, as written. The whole thing — 156 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Wingify FE MCP Server

Agent skill for this repository. Lives at skills/wingify-fe-mcp/ — not tied to any single editor or MCP host. Point your agent at this folder or copy SKILL.md into your host’s skills/instructions location as needed.

Product & branding

Use	Avoid (user-facing)
Wingify	VWO
FE / Feature Experimentation	FME
`WINGIFY_*` env vars	`VWO_*` (legacy fallback only)

npm package: wingify-fme-mcp · bin: dist/index.js · run: npx wingify-fme-mcp@latest
Source: lib/ · build output: dist/ · build: npm run build
MCP server class: WingifyMCPServer in lib/server.ts

Environment variables

Required for Wingify API tools:

WINGIFY_ACCOUNT_ID
WINGIFY_API_KEY
WINGIFY_API_BASE_URL (optional; defaults to https://app.wingify.com/api/v2/accounts)

Statsig migration tools also need:

STATSIG_API_KEY

Legacy VWO_ACCOUNT_ID, VWO_API_KEY, VWO_API_BASE_URL are still read if WINGIFY_* are unset.

Documentation URLs (v3)

Overview: https://developers.wingify.com/v3/docs/fme-overview
SDK prefix: https://developers.wingify.com/v3/docs/fme-{sdk} (e.g. fme-node)
Flags / metrics: fme-{sdk}-flags, fme-{sdk}-metrics

Defined in lib/utils/GetDocumentationData.ts. General tool footers use the overview link; metrics tools use SDK metrics pages.

Repo layout

lib/
  server.ts              # WingifyMCPServer, registers all tools
  config/                # WingifyConfig, StatsigConfig, MCPConfig
  services/              # WingifyRestAPI, StatsigRestAPI (singletons)
  tools/                 # One class per MCP tool, extends BaseTool
  schema/                # Zod raw shapes per tool input
  utils/                 # ResponseMessages, ToolResponse, StatsigMapper, StatsigSegmentMapper, WingifySegmentRenderConfig, etc.
ide-rules/               # Agent/editor rule templates (downloaded by AddWingifyRules)
skills/wingify-fe-mcp/   # This agent skill (SKILL.md + reference.md)

Read the full file on GitHub · 156 lines

Files

What ships with it

18 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

10d ago First seen · 156 lines · 78 tokens per session scan A 5ce8637bbfc3

Subscribe to this mod's changes

wingify-fe-mcp is a skill published in the GitHub repository wingify/wingify-fme-mcp (3 stars, last pushed 20d ago), licensed Apache-2.0. It adds 78 tokens to every session and 2,136 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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