Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add Houseofmvps/claude-rank/plugin install claude-rankWrote 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/commands/houseofmvps/claude-rank/rank-perf)<a href="https://agentmods.dev/commands/houseofmvps/claude-rank/rank-perf"><img src="https://agentmods.dev/badge/commands/houseofmvps/claude-rank/rank-perf/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/commands/houseofmvps/claude-rank/rank-perf"><img src="https://agentmods.dev/badge/commands/houseofmvps/claude-rank/rank-perf.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 | $0.00017 | $0.00227 |
| Opus 5 | $0.00009 | $0.00113 |
| Sonnet 5 | $0.00003 | $0.00045 |
| Haiku 4.5 | $0.00002 | $0.00023 |
Grade A, and why
rank-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 10d 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.
What it actually says
Performance + Mobile Scanner (20 rules)
Assess performance risks and mobile-first indexing issues from static HTML. No Chrome needed.
node ${CLAUDE_PLUGIN_ROOT}/tools/perf-scanner.mjs <directory|url>
Checks include:
- Images without width/height (CLS risk)
- Render-blocking scripts (no async/defer)
- Large inline CSS/JS (>50KB)
- Missing lazy loading on images
- Missing fetchpriority on LCP image
- No font-display: swap on web fonts
- Missing resource hints (preload/prefetch)
- Mixed content (HTTP resources on HTTPS page)
- Too many external script domains
- Missing preconnect hints
- Missing viewport meta tag (mobile-first indexing)
- Non-responsive viewport (fixed width instead of device-width)
- Small tap targets (<44px on interactive elements)
- Small font sizes (<12px)
- Fixed-width elements (>500px causing horizontal scroll)
Present findings with severity and fix suggestions.
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.
- 10d ago First seen · 32 lines · 17 tokens per session scan A 89ce7ea97afc
rank-perf is a command published in the GitHub repository Houseofmvps/claude-rank (143 stars, last pushed 2mo ago), licensed MIT. It adds 17 tokens to every session and 227 once invoked, about $0.0001 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.
Other commands, from other repositories
geo:optimize
Optimize a local content file for GEO without full audit.
checklist
Generate a custom checklist for the current feature based on user requirements.
clarify
Identify underspecified areas in the current feature spec by asking up to 5 highly targeted clarification questions and encoding answers back into the spec.
specify
Create or update the feature specification from a natural language feature description.
analyze
Perform a non-destructive cross-artifact consistency and quality analysis across spec.md, plan.md, and tasks.md after task generation.
converge
Assess the current codebase against the feature's spec, plan, and tasks, then append any remaining unbuilt work as new tasks to tasks.md so implement can complete it.