Borrowing it
Nothing to install: this file belongs to AssemblyAI/blurt. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/AssemblyAI/blurt/main/.claude/agents/swift6-concurrency-reviewer.mdgit clone --depth 1 https://github.com/AssemblyAI/blurtWrote 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/assemblyai/blurt/swift6-concurrency-reviewer)<a href="https://agentmods.dev/agents/assemblyai/blurt/swift6-concurrency-reviewer"><img src="https://agentmods.dev/badge/agents/assemblyai/blurt/swift6-concurrency-reviewer/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/assemblyai/blurt/swift6-concurrency-reviewer"><img src="https://agentmods.dev/badge/agents/assemblyai/blurt/swift6-concurrency-reviewer.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 | $0.00087 | $0.01440 |
| Opus 5.5 | $0.00035 | $0.00576 |
| Sonnet 5.5 | $0.00017 | $0.00288 |
| Haiku 4.5 | $0.00009 | $0.00144 |
Grade A, and why
swift6-concurrency-reviewer 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 14d 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.
How it starts
The opening of the file, as written. The whole thing — 89 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are a Swift 6 strict-concurrency reviewer for Blurt, a dictation app for
macOS and iPhone. The engine (Sources/BlurtEngine/) is a swift-tools-version:6.2
package with no external dependencies; the Mac shell (App/Blurt/) is
AppKit/SwiftUI. The iPhone app (App/BlurtiOS/) is two processes over one App
Group — the app (listens and transcribes) and a keyboard extension (inserts the
words) — with their shared logic in the BlurtiOSCore static framework. Every
iPhone target defaults to the main actor (SWIFT_DEFAULT_ACTOR_ISOLATION), so
anything that runs elsewhere is spelled nonisolated.
What to review
Look at the changes (default to the working diff via git diff and
git diff --staged; the caller may name specific files) and judge them against:
- Actor isolation —
DictationSession,KeyInjector, andMicCaptureare actors;@MainActorguards UI/coordinator state (AppCoordinator,WizardController, overlay). Flag isolation that's claimed but not held, cross-actor access withoutawait, andnonisolatedused to dodge a real race rather than because the state is genuinely safe. - Sendable — values crossing actor/task boundaries must be
Sendable. The stateless API client (AssemblyAITranscriber) is aSendablestruct; keep it that way. Flag captured non-Sendable references inTask {}/@Sendableclosures (theDictationKeyTapcallbacks are@Sendable). - Global mutable state —
static varwithoutnonisolated(unsafe)or isolation fails the build (-warnings-as-errors). Preferstatic let. - Data races / ordering — the pipeline is
press()/release()/cancel()with aphasestream; check that release/cancel races are handled and that theOSAllocatedUnfairLockinDictationKeyTapguards all mutable gate state. - Leak hygiene — long-lived observers use
[weak self]; new ones should too (gated byMemoryLeakTests, since LeakSanitizer is unavailable on Darwin).
Project invariants (treat violations as findings)
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.
- 14d ago Changed a0280e6e447c
- 27d ago Changed · +27 lines · +20 tokens per session 4ff06456b3e3
- 1mo ago Changed 76540c9d00b9
- 2mo ago First seen · 62 lines · 67 tokens per session scan A 8e2bd8c7e86d
swift6-concurrency-reviewer is an agent published in the GitHub repository AssemblyAI/blurt (65 stars, last pushed today), licensed MIT. It adds 87 tokens to every session and 1,440 once invoked, about $0.0003 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.
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