The OpenFeature MCP Server is a Cloudflare Worker-based service that provides OpenFeature SDK installation guidance via the MCP protocol. It offers an install_openfeature_sdk
tool to fetch Markdown-based installation guides (currently supporting React SDK), supports MCP communication over both JSON-RPC (/mcp
) and Server-Sent Events (/sse
) transports, and includes health check (/health
) and service information (/info
) endpoints. The server requires no authentication and leverages Cloudflare Workers for global edge distribution and serverless scalability.
Provides OpenFeature SDK installation guidance and setup instructions for React applications
Archived: MIGRATED TO OPENFEATURE ORG
OpenFeature MCP Local Server (stdio)
Warning
This project is in active development.
Features
A local Model Context Protocol (MCP) server that provides OpenFeature SDK installation guidance and Open Feature Remote Evaluation Protocol (OFREP) over stdio.
OpenFeature SDK Installation Guides: Fetch installation prompts for various OpenFeature SDKs
MCP stdio Transport: Intended for local usage by MCP-compatible clients
Configure your AI client (local)
Cursor
Add to ~/.cursor/mcp_settings.json
:
VS Code (Continue)
Add to .continue/config.json
:
Claude Code (CLI)
Add the server via CLI:
Then manage the connection in the CLI with /mcp
.
Windsurf
In the "Manage MCP servers" raw config, add:
Claude Desktop
Edit your Claude Desktop config and add:
Restart Claude Desktop after saving.
NPM Global install (optional)
If you prefer a global install instead of NPX:
Now in your MCP config use openfeature-mcp
as the command:
All logs are written to stderr. The MCP protocol messages use stdout.
Available Tools
install_openfeature_sdk
Fetches Markdown instructions for installing the OpenFeature SDK for a given technology. Optionally augments the prompt with installation guidance for one or more feature flag providers.
Parameters:
technology
(string enum): One of the supported technologies listed belowproviders
(string array, optional): Zero or more provider identifiers. If present, adds provider-specific installation notes to the prompt (or removes placeholder sections when empty).
Supported Technologies:
The technologies list is build from the avaliable prompts/*.md
, updated automatically using scripts/build-prompts.js
android
dotnet
go
ios
java
javascript
nestjs
nodejs
php
python
react
ruby
Supported Providers:
The provider list is sourced automatically from the OpenFeature open-feature/openfeature.dev
repo; newly added providers there become available here without manual edits.
See scripts/build-providers.js
for details.
ofrep_flag_eval
Evaluate feature flags via OpenFeature Remote Evaluation Protocol (OFREP).
If flag_key
is omitted, performs bulk evaluation.
References:
open-feature/protocol
,
OFREP OpenAPI spec
Parameters (all optional unless noted):
base_url
(string, optional): Base URL of your OFREP-compatible flag service. If omitted, the server uses env/config (see below).flag_key
(string, optional): If provided, calls single flag evaluation:/ofrep/v1/evaluate/flags/{key}
. If omitted, calls bulk:/ofrep/v1/evaluate/flags
.context
(object, optional): Evaluation context, e.g.{ "targetingKey": "user-123", ... }
.etag
(string, optional): For bulk requests, sent asIf-None-Match
to enable 304 caching semantics.auth
(object, optional): Inline auth for this call only.bearer_token
(string, optional): SetsAuthorization: Bearer <token>
.api_key
(string, optional): SetsX-API-Key: <key>
.
Auth and base URL resolution (priority):
Tool call args:
base_url
,auth.bearer_token
,auth.api_key
Environment variables:
OPENFEATURE_OFREP_BASE_URL
(orOFREP_BASE_URL
),OPENFEATURE_OFREP_BEARER_TOKEN
(orOFREP_BEARER_TOKEN
),OPENFEATURE_OFREP_API_KEY
(orOFREP_API_KEY
)Config file:
~/.openfeature-mcp.json
(override withOPENFEATURE_MCP_CONFIG_PATH
)
Example ~/.openfeature-mcp.json
:
Notes:
Bulk requests may return
ETag
. Pass it back viaetag
to leverage 304 Not Modified.Either bearer token or API key can be supplied; both are supported by the spec.
Development
Prerequisites
Node.js 18+
Setup
Install dependencies:
npm installAdd or edit install guides in the
prompts/
folder (Markdown). These are bundled at build time.Build prompts bundle:
npm run build-promptsBuild TypeScript:
npm run buildRun locally (binary entrypoint):
node dist/cli.js
remote-capable server
The server can be hosted and run remotely because it primarily relies on remote services or has no dependency on the local environment.
Provides OpenFeature SDK installation guidance through MCP tool calls. Enables AI clients to fetch installation prompts and setup instructions for various OpenFeature SDKs across different programming languages and frameworks.
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