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 agentmods add skills/automagik-dev/genie/perfnpx skills add automagik-dev/genie --skill perfgit clone --depth 1 https://github.com/automagik-dev/genieWrote 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/automagik-dev/genie/perf)<a href="https://agentmods.dev/skills/automagik-dev/genie/perf"><img src="https://agentmods.dev/badge/skills/automagik-dev/genie/perf.svg" alt="Measured on agentmods" 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 | $0.00047 | $0.01282 |
| Opus 5 | $0.00023 | $0.00641 |
| Sonnet 5 | $0.00009 | $0.00256 |
| Haiku 4.5 | $0.00005 | $0.00128 |
Grade A, and why
perf 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 4d 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 — 52 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Performance Review
Runtime syntax: invoke the plugin copy through the active runtime's owner-qualified skill selector; use a bare selector only when intentionally selecting a user-tier copy (a separately installed personal copy; Genie no longer seeds this tier). Cross-skill prose below uses bare names as portable semantic routes; the orchestrator resolves the selector for the active runtime.
Lens
This lane begins performance work with measurement of the running system, never with intuition about the code. Every claim carries the command that produced it and the number it produced. The USE method frames each resource — utilization, saturation, errors. The most expensive performance bug is the one "fixed" without measuring before and after.
This lane's lens is inspired by the work of Brendan Gregg — author of Systems Performance, inventor of flame graphs and the USE method.
Mandate
Assess and report by default. Apply optimizations only when the invocation explicitly asks — and then only with a before/after measurement pair. Never report an estimate where a measurement is obtainable this session. Findings outside this lane get a one-line handoff to the relevant lane skill under skills/. When you have enough numbers to conclude, conclude.
Discover the Ground Truth First
Before measuring anything, establish what the product is and which latency its users actually feel: a CLI pays cold start per invocation (and per hook event, if it's invoked by hooks — the hook timeout is then the hard ceiling); a server pays per-request latency and saturation; a batch tool pays throughput. Read the entry points, the build config (bundling, minification, what's inlined), the manifest for dependency weight, and CLAUDE.md/AGENTS.md for stated performance constraints and deliberate tradeoffs (fork-per-event models, zero-daemon rules, chosen storage engines). Identify the shipped artifact users run — measure that, not the dev-mode path. Never carry numbers forward from documentation; a documented size or timing is a claim to re-measure.
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.
- 4d ago First seen · 52 lines · 47 tokens per session scan A 93fecc839b65
perf is a skill published in the GitHub repository automagik-dev/genie (334 stars, last pushed yesterday), licensed MIT. It adds 47 tokens to every session and 1,282 once invoked, about $0.0002 per session on Opus 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 2026-08-30.
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writing
将共享历史中的已验证事实和计算结果整理成符合受众、格式与长度约束的成稿。.
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