fly-io SKILL.md skillB
fly-io from ericrisco/rsc-harness is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add ericrisco/rsc-harness/fly-io@git:20260729.9b4d66aPins git:20260729.9b4d66a in mdr.lock. Pin the fingerprint instead.
- Audit grade
- B, 16 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- ericrisco/rsc-harness
- Path
skills/fly-io/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260729.9b4d66a, committed Jul 29, 2026
- First version recorded
- Jun 2, 2026
- Size
- 11,347 bytes
- Repository stars
- 236
- License
- MIT
Use when deploying or operating an app on Fly.io — writing fly.toml, placing Machines in regions near users, attaching Volumes, managing secrets, or picking a scaling lever (autostop/autostart, scale count, fly-replay). NOT choosing which host to deploy on (that is `deployment`), NOT a git-push PaaS with no regions model (that is `railway`).
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Deploy on Fly.io You are deploying an app to Fly.io: a `fly.toml`, Machines (Firecracker microVMs) placed in regions close to users, optional region-pinned Volumes, secrets, and the right scaling lever. Get the mental model right first, then the config follows. If none of that placement control matters, ../railway/SKILL.md is the git-push PaaS with no Machines/regions model. ## Mental model - **App** is the logical unit. It owns a name, a `primary_region`, and config in `fly.toml`. Why: every command targets an app. - **Process groups** (`[processes]`, e.g. `web`, `worker`) split one image into roles. Why: a web group takes traffic, a worker group does not — they bind services and VMs separately. - **Machines** are Firecracker microVMs running your image. Each runs in exactly one region. Why: latency and volumes are per-Machine, so placement is the whole game. - **Fly Proxy** is the anycast front door. It routes a request to the nearest running Machine, can start a stopped one, and obeys `fly-replay` headers. Why: it is what makes "global" cheap — you do not run a load balancer. …
Read the whole file at its exact version.
How to install
mdr add ericrisco/rsc-harness/fly-io@sha256:7041770bc7723496The line at the top of this page pins the label git:20260729.9b4d66a, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_7vmqlt7emc3urr2b)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Jun 2, 2026 and Jul 29, 2026, about one every 57 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260729.9b4d66a latest | 2026-07-29 | 9b4d66a | 11,347 B | B | view · diff |
| git:20260602.1e843fe | 2026-06-02 | 1e843fe | 11,747 B | B | view |
Audit of the latest version
- fail: No instruction to read or print local credentials (matched: Read `process.env)
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (11347 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Starting a new one? Use a template for SKILL.md on mdpantry, which passes every one of these checks and says what to change in it.
Source
ericrisco/rsc-harness · 236 stars · license MIT · pushed 2026-10-21 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_7vmqlt7emc3urr2b GET https://markdownregistry.com/api/v1/resolve?ref=ericrisco/rsc-harness/fly-io GET https://markdownregistry.com/api/v1/blob/7041770bc77234962886dd1cc40cc312080061b316b4ee4b4b29f16ce761173a
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
More from ericrisco/rsc-harness
Every file in ericrisco/rsc-harness