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.
npx skills add d-oit/rust-2026-template --skill tokio-performancegit clone --depth 1 https://github.com/d-oit/rust-2026-templateWrote 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/skills/d-oit/rust-2026-template/tokio-performance)<a href="https://agentmods.dev/skills/d-oit/rust-2026-template/tokio-performance"><img src="https://agentmods.dev/badge/skills/d-oit/rust-2026-template/tokio-performance/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/skills/d-oit/rust-2026-template/tokio-performance"><img src="https://agentmods.dev/badge/skills/d-oit/rust-2026-template/tokio-performance.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 | $0.00060 | $0.03224 |
| Opus 5.5 | $0.00024 | $0.01290 |
| Sonnet 5 | $0.00012 | $0.00645 |
| Haiku 4.5 | $0.00006 | $0.00322 |
Grade A, and why
tokio-performance 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 6d 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 — 250 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Tokio Performance
Performance guidance for production Rust systems using Tokio. Optimize measured behavior from workload characteristics, not async code by reflex.
Core Rule
Measure first. Derive execution models, concurrency bounds, and lock strategies from workload characteristics.
Do not assume:
asyncis faster than synchronous codespawn_blockingis always better for CPU worktokio::sync::MutexorRwLockis preferable to a synchronous lock or atomic/snapshot pattern- more tasks or more runtimes mean more throughput
yield_now()everywhere improves fairness
Workload Decision Matrix
| Workload Type | Characteristics | Recommended Execution Model | Key Considerations |
|---|---|---|---|
| Short Bounded CPU | Fast, non-blocking calculations (< 10–100 µs), memory parsing, small serializations | Direct Execution on Tokio Worker | Offloading to spawn_blocking introduces thread context switches and queue overhead that exceed the work duration. |
| Genuinely Blocking | Synchronous disk I/O, blocking C/FFI calls, legacy blocking SDKs, blocking DB drivers | spawn_blocking or Dedicated Thread Pool |
Prevents blocking the Tokio worker thread event loop. |
| Long or Sustained CPU | Image processing, heavy cryptography, compression, large payload parsing (> 100 µs - ms+) | spawn_blocking or Dedicated Worker Pool |
Protects Tokio worker threads from starvation. For sustained heavy CPU, prefer a dedicated Rayon/thread pool to avoid exhausting Tokio's blocking pool. |
| Batchable Operations | High-rate small I/O operations, frequent channel sends, small database updates | Batching & Micro-buffering | Consolidates syscalls, locks, and channel synchronization overhead. |
| Isolated Subsystems | Multi-tenant latency isolation, distinct thread priority requirements | Workload Isolation | Isolate via bounded semaphores or separate thread pools before considering a separate Tokio runtime. |
Correctness vs. Performance Heuristics
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 6d ago First seen · 250 lines · 60 tokens per session scan A 5f6fcfa1eafa
tokio-performance is a skill published in the GitHub repository d-oit/rust-2026-template (11 stars, last pushed yesterday), licensed MIT. It adds 60 tokens to every session and 3,224 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 2026-09-18.
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