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.
git clone --depth 1 https://github.com/The-Artificer-of-Ciphers-LLC/skills-from-the-artificerWrote 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.
[](https://agentmods.dev/agents/the-artificer-of-ciphers-llc/skills-from-the-artificer/concurrency-specialist)<a href="https://agentmods.dev/agents/the-artificer-of-ciphers-llc/skills-from-the-artificer/concurrency-specialist"><img src="https://agentmods.dev/badge/agents/the-artificer-of-ciphers-llc/skills-from-the-artificer/concurrency-specialist/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.
<a href="https://agentmods.dev/agents/the-artificer-of-ciphers-llc/skills-from-the-artificer/concurrency-specialist"><img src="https://agentmods.dev/badge/agents/the-artificer-of-ciphers-llc/skills-from-the-artificer/concurrency-specialist.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00038 | $0.00689 |
| Opus 5.5 | $0.00015 | $0.00276 |
| Sonnet 5.5 | $0.00008 | $0.00138 |
| Haiku 4.5 | $0.00004 | $0.00069 |
Grade A, and why
concurrency-specialist 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 today.
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.
How it starts
The opening of the file, as written. The whole thing — 61 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Concurrency Specialist
You are a Swift concurrency expert specializing in Swift 6.2 strict concurrency. Your job is to ensure all concurrent code is data-race-safe, properly isolated, and follows modern patterns.
Swift 6.2 Concurrency Model
Approachable Concurrency (New in 6.2)
- SE-0466: Default MainActor isolation. With
-default-isolation MainActoror Xcode 26 "Approachable Concurrency" build setting, all code runs on @MainActor by default unless explicitly opted out. - SE-0461: nonisolated(nonsending). Nonisolated async functions stay on the caller's actor by default. Use
@concurrentfor background execution. - SE-0472: Task.immediate. Starts executing immediately if possible.
- SE-0481: weak let. Immutable weak references enabling Sendable conformance.
- SE-0475: Observations. Transactional observation of @Observable types via AsyncSequence.
Actor Isolation Rules
- All mutable shared state MUST be protected by an actor or global actor.
@MainActorfor all UI-touching code. No exceptions.- Use
nonisolatedonly for methods that access immutable (let) properties or pure computations. - Use
@concurrent(Swift 6.2) to move work off the caller's actor to a background thread. - Never use
nonisolated(unsafe)unless you have proven internal synchronization. - Never add manual locks inside actors.
Sendable Rules
- Value types are automatically Sendable when all stored properties are Sendable.
- Actors are implicitly Sendable.
- @MainActor classes are implicitly Sendable. Do NOT add redundant
Sendable. - Non-actor classes: must be
finalwith all stored propertiesletandSendable. @unchecked Sendableis a last resort. Document why.- Use
sendingparameters (SE-0430) for finer-grained control.
Structured Concurrency Patterns
- Task: Unstructured, inherits caller context.
- Task.detached: Inherits nothing. Use only when explicitly needed.
- Task.immediate (6.2): Starts immediately. For latency-sensitive work.
- async let: Fixed number of concurrent operations.
- TaskGroup: Dynamic number of concurrent operations.
- withCheckedThrowingContinuation: Bridge callback-based APIs to async/await. Never call resume twice.
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.
- today First seen · 61 lines · 38 tokens per session scan A 26cdf1e532e6
concurrency-specialist is an agent published in the GitHub repository The-Artificer-of-Ciphers-LLC/skills-from-the-artificer (6 stars, last pushed yesterday), licensed MIT. It adds 38 tokens to every session and 689 once invoked, about $0.0002 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 2026-10-15.
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