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flashbotsflashbotsOfficial·1 Agent Skills Included

builder-playground

Spin up Ethereum devnets for block building and MEV testing

Deploys complete Ethereum L1 and L2 development networks with a single command, including execution clients, consensus nodes, mev-boost relays, and builder infrastructure. Eliminates manual genesis generation, validator key setup, and Docker configuration when testing block-building pipelines. Provides ready-made recipes and custom YAML overrides so developers can run repeatable end-to-end and CI scenarios in seconds.
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npx skills add flashbots/builder-playground --all -g -y
Available:

Explains the repository's component, recipe, and manifest architecture so the agent can correctly build, test, and extend devnet recipes, and instructs it to complete implementation tasks end-to-end including branching, committing, and opening pull requests.

All Skills in This Repository (1)

Pure Emerald Level Indicators
📦 In Repo
flashbotsflashbots

docs

Document Builder Playground custom recipe YAML schema and operational rules.

Official
Intermediate

Frequently Asked Questions

FAQPage Schema
How to install builder-playground?▼

Run `npx skills add flashbots/builder-playground --all -g -y` in your terminal to install all skills in this repository globally.

What does builder-playground do?▼

It spins up self-contained Ethereum development networks with one command, deploying execution and consensus clients, mev-boost relays, and builder infrastructure for testing block-building software.

How do I start an Ethereum test network?▼

Run `builder-playground start l1` for a full L1 stack with mev-boost, or `builder-playground start opstack` for an L2 OP Stack environment with a sequencer.

Can I customize the devnet configuration?▼

Yes. Write a small custom recipe YAML file that extends a base recipe like l1 or opstack, then run it with `builder-playground start playground.yaml`.

Can I use builder-playground in CI pipelines?▼

Yes. Use the flashbots/builder-playground-action GitHub Action to spin up devnets in your workflows and run repeatable end-to-end tests.

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