principle-concurrency SKILL.md skillA
principle-concurrency from lugassawan/swe-workbench is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add lugassawan/swe-workbench/principle-concurrency@git:20260828.71a6399Pins git:20260828.71a6399 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- lugassawan/swe-workbench
- Path
skills/principle-concurrency/SKILL.md- Versions recorded
- 5
- Latest version
- git:20260828.71a6399, committed Aug 28, 2026
- First version recorded
- Apr 29, 2026
- Size
- 5,794 bytes
- Repository stars
- 3
- License
- MIT
Concurrency principles — race conditions, livelock, backpressure, lock-free primitives, choosing between mutex vs channel vs actor vs semaphore vs CAS. Auto-load when designing concurrent code, fixing a deadlock, choosing a synchronization primitive, or reasoning about goroutine/thread/task lifetimes.
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
<!-- preload-canary: SWB-PRELOAD-PRINCIPLE-CONCURRENCY --> # Concurrency Concurrency is a correctness hazard first, a performance tool second. Prove correctness before optimizing. ## Failure Modes **Race condition** — two goroutines/threads read and write shared state without synchronization; result is non-deterministic. **Fix:** mutex, channel, or atomic. **Deadlock** — two or more tasks each hold a lock the other needs; all block forever. **Fix:** consistent lock-acquisition ordering; prefer higher-level primitives. **Livelock** — tasks keep changing state in response to each other but make no progress; common in retry loops that back off identically. **Fix:** add jitter; use backpressure signals. **Starvation** — a low-priority task never gets scheduled because high-priority tasks monopolize a resource. **Fix:** fair queues; priority inheritance; rate limits. **Lost wakeup** — a condition-variable signal fires before the waiter starts waiting; waiter sleeps forever. **Fix:** always check the predicate in a loop; use atomic flags. …
Read the whole file at its exact version.
How to install
mdr add lugassawan/swe-workbench/principle-concurrency@sha256:a8b2cf28dd761431The line at the top of this page pins the label git:20260828.71a6399, 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_ahxgnnptctab4fjh)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Apr 29, 2026 and Aug 28, 2026, about one every 30 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260828.71a6399 latest | 2026-08-28 | 71a6399 | 5,794 B | A | view · diff |
| git:20260811.925e30f | 2026-08-11 | 925e30f | 5,968 B | A | view · diff |
| git:20260725.074b496 | 2026-07-25 | 074b496 | 5,940 B | A | view · diff |
| git:20260610.8453859 | 2026-06-10 | 8453859 | 5,881 B | A | view · diff |
| git:20260429.cfd17ac | 2026-04-29 | cfd17ac | 5,671 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 (5794 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
lugassawan/swe-workbench · 3 stars · license MIT · pushed 2026-11-07 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_ahxgnnptctab4fjh GET https://markdownregistry.com/api/v1/resolve?ref=lugassawan/swe-workbench/principle-concurrency GET https://markdownregistry.com/api/v1/blob/a8b2cf28dd761431b20d775884456e8cb87f56b4c8ffd9dbb5b4041401093c4f
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.