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concurrency-correctness

concurrency-correctness is a skill for Claude Code, Codex from New1Direction/korgex. It costs 19 tokens per session (344 once invoked), scanned A, original, MIT.

A set of guidelines for writing concurrent code, where multiple tasks run at the same time and may share data.

In plain words
What is it for?
Use it when working with threads, processes, asynchronous tasks, shared state, locks, queues, or parallel tests.
Why use it?
It helps prevent race conditions, deadlocks, incorrect ordering, lost errors, and unfinished background tasks.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

not rated 5repo 24d ago A scan 19 tokens original MIT

Good fit Use it when working with threads, processes, asynchronous tasks, shared state, locks, queues, or parallel tests.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/new1direction/korgex/concurrency-correctness
View source ↗ New1Direction/korgex korgex-docs.pages.dev
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add New1Direction/korgex --skill concurrency-correctness
Clone the repo
git clone --depth 1 https://github.com/New1Direction/korgex

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for concurrency-correctness

README.md
[![agentmods](https://agentmods.dev/badge/skills/new1direction/korgex/concurrency-correctness/github.svg)](https://agentmods.dev/skills/new1direction/korgex/concurrency-correctness)
Your own site
<a href="https://agentmods.dev/skills/new1direction/korgex/concurrency-correctness"><img src="https://agentmods.dev/badge/skills/new1direction/korgex/concurrency-correctness/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for concurrency-correctness

Your own site · 80×15
<a href="https://agentmods.dev/skills/new1direction/korgex/concurrency-correctness"><img src="https://agentmods.dev/badge/skills/new1direction/korgex/concurrency-correctness.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 19 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 344 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00019 $0.00344
Opus 5.5 $0.00008 $0.00138
Sonnet 5.5 $0.00004 $0.00069
Haiku 4.5 $0.00002 $0.00034

Measured 2mo ago against content hash bc69f55af13f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

concurrency-correctness scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

src/skills_builtin/concurrency-correctness/SKILL.md · 29 lines

What it actually says

Concurrency bugs are nondeterministic and brutal to debug — get the design right up front rather than patching symptoms.

  1. Find the shared mutable state. Races happen only where two flows touch the same mutable data. Enumerate it. The safest design shares nothing — pass messages / immutable data instead.
  2. Protect every access, consistently. If state is shared, guard ALL reads and writes with the same lock (or use an atomic/concurrent structure). A single unguarded access defeats the lock.
  3. Avoid deadlock. Acquire multiple locks in a consistent global order; hold them as briefly as possible; don't call out to unknown code while holding one.
  4. Don't assume ordering or atomicity. "It worked when I ran it" proves nothing — interleavings you didn't see still happen. check-then-act is a race unless atomic.
  5. Wait on conditions, not sleeps (see condition-based-waiting). For tests of concurrent code, synchronize on events/barriers — never sleep to dodge a race.
  6. Bound and clean up. Cap parallelism; ensure every spawned task is awaited or cancelled; propagate errors from workers instead of losing them.

Red flags: a sleep "fixing" flakiness, a lock around some-but-not-all accesses, shared mutable state with no guard, swallowed worker exceptions.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2mo ago First seen · 29 lines · 19 tokens per session scan A bc69f55af13f

Subscribe to this mod's changes

concurrency-correctness is a skill published in the GitHub repository New1Direction/korgex (5 stars, last pushed 24d ago), licensed MIT. It adds 19 tokens to every session and 344 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Backend and APIsCode reviewai-agentautonomous-codingcloud-sandboxcoding-agentdeveloper-tools
Related

concurrency-correctness compared with skills from other repositories

concurrency-correctness next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
concurrency-correctnessNew1Direction/korgexSkill524d agoMITA19Claude Code, Codex
api-contract-reviewergvkhosla/compound-engineering-piSkill521mo agoMITA56Claude Code, Codex
dhh-rails-reviewergvkhosla/compound-engineering-piSkill521mo agoMITA40Claude Code, Codex
P12-modulargitRasheed/metis-skillSkill219d agoMITA0Claude Code, Codex
api-reviewerlfyxhappy/lfcodeSkill21mo agoMITA53Claude Code, Codex
vibe-securityxushuodasd/VIBE-Claude-PluginSkill44mo agoMITA49Claude Code
api-designsubhansh-dev/agent-maxxingSkill33mo agoMITA20Claude Code, Codex