cats-effect-resource

Original：🇺🇸 English

Translated

Scala resource lifecycle management with Cats Effect `Resource` and `IO`. Use when defining safe acquisition/release, composing resources (including parallel acquisition), or designing resource-safe APIs and cancellation behavior for files, streams, pools, clients, and background fibers.

1installs

Sourcealexandru/skills

Added on2026-02-08

NPX Install

npx skill4agent add alexandru/skills cats-effect-resource

SKILL.md Content

View Translation Comparison →

Cats Effect Resource (Scala)

Quick start

Model each resource with
```
Resource.make
```
or
```
Resource.fromAutoCloseable
```
and keep release idempotent.
Compose resources with
```
flatMap
```
,
```
mapN
```
,
```
parMapN
```
, or helper constructors; expose
```
Resource[F, A]
```
from APIs.
Use
```
Resource
```
at lifecycle boundaries and call
```
.use
```
only at the program edges.
Read
```
references/resource.md
```
for patterns, best practices, and API notes.

Workflow

Identify acquisition, use, and release steps; decide if acquisition is blocking.
Implement a
```
Resource[F, A]
```
constructor using the smallest needed typeclass.
Compose resources into higher-level resources and keep finalizers minimal.
Decide how cancelation and errors should influence release logic.
Run with
```
.use
```
at the boundary (IOApp, service startup) and avoid leaking raw
```
A
```
.

Usage guidance

Prefer
```
Resource
```
over
```
try/finally
```
or
```
bracket
```
when composition and cancelation safety matter.
Use
```
IO.blocking
```
(or
```
Sync[F].blocking
```
) for acquisition and release when calling blocking JVM APIs.
For background fibers, use
```
Resource
```
or
```
Supervisor
```
to ensure cleanup on cancelation.

References

Load
```
references/resource.md
```
for API details, patterns, and examples.
For Kotlin/Arrow parallels, see the
```
arrow-resource
```
skill.

Install this skill with

npx skills add https://github.com/alexandru/skills --skill cats-effect-resource

.