go-concurrency SKILL.md skillA
go-concurrency from tanq16/claudex is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add tanq16/claudex/go-concurrency@git:20260825.865fc73Pins git:20260825.865fc73 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- tanq16/claudex
- Path
internal/embedded/presets/private/skills/go-concurrency/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260825.865fc73, committed Aug 25, 2026
- First version recorded
- Aug 18, 2026
- Size
- 6,961 bytes
- Repository stars
- 3
- License
- none declared
Goroutine patterns for Go - WaitGroup, errgroup, bounded concurrency, fan-out/fan-in, and context cancellation. Use when running work concurrently, limiting how much runs at once, collecting results or errors from parallel operations, or making a long operation cancellable. Triggers on go func, sync.WaitGroup, wg.Go, errgroup, SetLimit, buffered channel semaphores, ctx.Done, and worker pools.
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
# Go Concurrency
**Pick the smallest primitive that carries the error semantics you need, and let the standard library handle the bookkeeping.**
## Pattern Selection
| Need | Pattern |
|---|---|
| Run N things, wait for all | `sync.WaitGroup` via `wg.Go` |
| Run N things, stop all on the first error | `errgroup` |
| Limit to M concurrent operations | `errgroup.SetLimit`, or a buffered-channel semaphore |
| Distribute a stream to workers and merge results | fan-out/fan-in |
`errgroup` is the default whenever an operation can fail, with `g.SetLimit(N)` added for bounded concurrency. Drop to a raw `sync.WaitGroup` only when errors are genuinely fire-and-forget, because a WaitGroup gives you no way to learn that half the work failed.
```go
import "golang.org/x/sync/errgroup"
g, ctx := errgroup.WithContext(ctx)
g.SetLimit(10)
for _, item := range items {
g.Go(func() error {
return process(ctx, item)
})
}
return g.Wait() // the first error, or nil
```
Go 1.22 and later scope loop variables per iteration, so the old `item := item` capture before a goroutine is unnecessary on this baseline.
## WaitGroup, Fire and Forget
…Read the whole file at its exact version.
How to install
mdr add tanq16/claudex/go-concurrency@sha256:f28473653f5bc80fThe line at the top of this page pins the label git:20260825.865fc73, 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_e73d66mfzels7khe)
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Versions
The registry has recorded 3 versions of this file, between Aug 18, 2026 and Aug 25, 2026, about one every 4 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260825.865fc73 latest | 2026-08-25 | 865fc73 | 6,961 B | A | view · diff |
| git:20260818.236909b | 2026-08-18 | 236909b | 7,008 B | A | view · diff |
| git:20260818.99a9bbb | 2026-08-18 | 99a9bbb | 14,207 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (6961 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 instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
tanq16/claudex · 3 stars · license none declared · pushed 2026-10-12 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_e73d66mfzels7khe GET https://markdownregistry.com/api/v1/resolve?ref=tanq16/claudex/go-concurrency GET https://markdownregistry.com/api/v1/blob/f28473653f5bc80fd2d920e18be6a393f9e60ef9f07f40a27e382528807ed5ec
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