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missBerg
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eg-extension

Create EnvoyExtensionPolicy resources to attach ExtProc, Wasm, or Lua extensions to Gateway, HTTPRoute, or Backend targets.

3|Updated Mar 8, 2026
Search Tags:#kubernetes#extension#lua#wasm#envoy#envoy-gateway#extproc
One-click install
npx skills add https://github.com/missBerg/envoy-skills --skill eg-extension
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: eg-extension
Source: https://github.com/missBerg/envoy-skills/tree/main/gateway/adopters/skills/eg-extension
Command: npx skills add https://github.com/missBerg/envoy-skills --skill eg-extension

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Extend Envoy Gateway data plane with ExtProc, Wasm, or Lua extensions via EnvoyExtensionPolicy to customize request/response handling and observability.

Core Features & Use Cases

  • Create EnvoyExtensionPolicy to attach ExtProc, Wasm, or Lua extensions to Gateway, HTTPRoute, or Backend targets.
  • Supports ExtProc (out-of-process gRPC), Wasm (in-process or OCI+HTTP), and Lua inline or ConfigMap scripting for lightweight transforms.
  • Use cases include custom authentication, header manipulation, request/response transformation, and model routing/observability integration with Envoy AI Gateway.

Quick Start

Define your extension type and target, then apply the policy to enable the extension.

Frequently Asked Questions about eg-extension

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I extend Envoy Gateway with custom Lua scripts?▼

To extend Envoy Gateway with Lua, you create an EnvoyExtensionPolicy resource that references a Gateway, HTTPRoute, or Backend target and configures inline or ConfigMap Lua scripts for lightweight request and response transformations.

Can I use ExtProc to inject external processing into Envoy Gateway?▼

Yes, you can use ExtProc to inject external processing by defining an EnvoyExtensionPolicy with a targetRefs entry and an extProc configuration that points to a deployed gRPC service for out-of-process request handling.

What is the best way to attach a Wasm filter to an HTTPRoute in Envoy Gateway?▼

The best way to attach a Wasm filter is by applying an EnvoyExtensionPolicy to the HTTPRoute target, specifying a wasm configuration that loads your in-process or OCI and HTTP fetched Wasm module into the data plane.

Does Envoy Gateway support EnvoyExtensionPolicy for custom authentication and header manipulation?▼

Yes, Envoy Gateway supports EnvoyExtensionPolicy for custom authentication and header manipulation by allowing you to attach ExtProc, Wasm, or Lua extensions to Gateway, HTTPRoute, or Backend targets.

How do I configure an EnvoyExtensionPolicy for model routing observability in Envoy AI Gateway?▼

You configure an EnvoyExtensionPolicy for model routing observability by setting a targetRefs entry and applying ExtProc, Wasm, or Lua extension configurations to inject custom metrics and routing logic into the Envoy AI Gateway data plane.

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