ClaudeSuperPower
SubmitLog in

viceroy

Skill

Runs Fastly Compute WASM applications locally with Viceroy, specifically for Rust and Component Model projects. Use when starting a local Fastly Compute dev server with Viceroy, configuring fastly.toml for local backend overrides and store definitions, running Rust unit tests with cargo-nextest agai

0Testing

Install

git clone https://github.com/fastly/fastly-agent-toolkit.git ~/.claude/skills/viceroy

What is viceroy?

Runs Fastly Compute WASM applications locally with Viceroy, specifically for Rust and Component Model projects. Use when starting a local Fastly Compute dev server with Viceroy, configuring fastly.toml for local backend overrides and store definitions, running Rust unit tests with cargo-nextest against the Compute runtime, debugging Compute apps locally, adapting core WASM modules to the Component Model, or troubleshooting local Compute testing issues (connection refused, missing backends, store config). For non-Rust Compute work or understanding the Compute API, prefer the fastlike skill instead — its source code is easier to understand as a Fastly Compute API reference.

What this can do

Capabilities declared in this component's own frontmatter — not inferred.

Inherit all session tools

Declares no tool restrictions — inherits every session tool

~170 tokens of context used while enabled, before you invoke anything

Documentation

README · ~1 min read

Viceroy — Local Fastly Compute Runtime

Viceroy is Fastly's official local testing environment for Compute applications. It emulates the Fastly Compute platform, allowing you to develop and test WASM services locally.

Viceroy documentation: https://github.com/fastly/Viceroy

Common Gotchas

  • Dictionaries and ConfigStores are both supported but configured differently in fastly.toml. Dictionaries go under [local_server.dictionaries] as inline key-value maps or JSON files. ConfigStores go under [local_server.config_stores].
  • fastly.toml must have a [local_server] section. Without it, Viceroy won't know about your backends, stores, or other local overrides. Every backend your app calls must be listed under [local_server.backends].
  • Default port is 7676, not 5000 (which is Fastlike's default). Access your app at http://127.0.0.1:7676.
  • Backends should point to local servers when developing locally. Avoid proxying to remote production origins to prevent accidentally leaking request data.

Quick Start

Reviews

Log in to leave a review.

No reviews yet — be the first.

Explore related

Other things in this space — across every part of the ecosystem, not just skills.

Subagents

All subagents →

agent-creator

Use this agent when the user asks to "create an agent", "generate an agent", "build a new agent", "make me an agent that...", or describes agent functionality they need. Trigger when user wants to create autonomous agents for plugins. Examples: <example> Context: User wants to create a code review a

32.8K stars

code-architect

Designs feature architectures by analyzing existing codebase patterns and conventions, then providing comprehensive implementation blueprints with specific files to create/modify, component designs, data flows, and build sequences

32.8K stars

plugin-validator

Use this agent when the user asks to "validate my plugin", "check plugin structure", "verify plugin is correct", "validate plugin.json", "check plugin files", or mentions plugin validation. Also trigger proactively after user creates or modifies plugin components. Examples: <example> Context: User f

32.8K stars