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 Componen…
Install
$ agentstack add skill-fastly-fastly-agent-toolkit-viceroy ✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.
Security review
✓ PassedNo issues found. Passed automated security review. · v0.1.0 How review works →
- ✓ Prompt-injection patterns
- ✓ Secret / credential exfiltration
- ✓ Dangerous shell & filesystem operations
- ✓ Untrusted network calls
- ✓ Known-malicious package signatures
What it can access
- ✓ Network access No
- ✓ Filesystem access No
- ✓ Shell / process execution No
- ✓ Environment & secrets No
- ✓ Dynamic code execution No
From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.
Verified badge
Passed review? Show it. Paste this badge into your README, it links to the public security report.
Links to your public security report.[](https://agentstack.voostack.com/security/report/skill-fastly-fastly-agent-toolkit-viceroy) Reliability & compatibility
Declared compatibility
Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.
We're building live execution health for every listing: tool-call success rate, median latency, uptime, and last-checked timestamps, measured, not self-reported. It isn't live yet, so we don't show numbers we can't stand behind.
How agent discovery & health will work →About
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.tomlmust 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
# Install Viceroy
cargo install --locked viceroy
# Build your Compute app
fastly compute build
# Start local server (default: 127.0.0.1:7676)
viceroy -C fastly.toml bin/main.wasm
# Or use the Fastly CLI wrapper
fastly compute serveReferences
| Topic | File | Use when... | | ------ | --------------------------------------------------------------- | ------------------------------------------------------------------------------ | | Serve | [fastly-compute-serve.md](references/fastly-compute-serve.md) | Starting local dev server, profiling, advanced server options | | Config | [fastly-compute-config.md](references/fastly-compute-config.md) | Configuring fastly.toml backends, stores, geolocation, device detection, ACLs | | Test | [fastly-compute-test.md](references/fastly-compute-test.md) | Running Rust unit tests with cargo-nextest, writing tests for Compute services | | Adapt | [fastly-compute-adapt.md](references/fastly-compute-adapt.md) | Converting core WASM modules to Component Model, custom build pipelines |
Source & license
This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.
- Author: fastly
- Source: fastly/fastly-agent-toolkit
- License: MIT
Install and usage instructions live in the source repository linked above.
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Versions
- v0.1.0 Imported from the upstream source.