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 cnfeat/top-pm-skills --skill performance-budgetgit clone --depth 1 https://github.com/cnfeat/top-pm-skillsWrote 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/cnfeat/top-pm-skills/performance-budget)<a href="https://agentmods.dev/skills/cnfeat/top-pm-skills/performance-budget"><img src="https://agentmods.dev/badge/skills/cnfeat/top-pm-skills/performance-budget/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/cnfeat/top-pm-skills/performance-budget"><img src="https://agentmods.dev/badge/skills/cnfeat/top-pm-skills/performance-budget.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 | $0.00083 | $0.03339 |
| Opus 5 | $0.00042 | $0.01670 |
| Sonnet 5 | $0.00017 | $0.00668 |
| Haiku 4.5 | $0.00008 | $0.00334 |
Grade A, and why
performance-budget 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 — 286 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Performance Budget Skill
Produce a complete, actionable performance budget document for a web service or application. A performance budget is not a wishlist — it is a set of measurable, enforced constraints that define what "acceptable performance" means and who is responsible when those constraints are violated.
A good performance budget answers: what are the targets, how are they measured, what triggers an investigation, and what happens when a budget is breached.
Required Inputs
Ask for these if not already provided:
- Service name and type — web app, API service, mobile app, or combination
- Key user journeys — the 3–5 most important flows users take (e.g. "search → product page → checkout")
- Current baseline metrics — P50/P95/P99 latency, LCP, CLS, INP if available (state "no baseline" if not collected yet)
- Tech stack — frontend framework, backend language/framework, CDN, database
- Deployment environment — cloud provider, region(s), edge/CDN configuration
- Cost constraints — any budget or infrastructure limits that affect headroom
Output Format
Performance Budget: [Service Name]
Service: [Name] | Team: [Team name] Last updated: [Date] | Owner: [Name / role] Environment: [Production / Staging baseline] | Review cadence: [Quarterly / per-sprint]
Overview
[2–3 sentences describing the service, its user-facing performance requirements, and why performance is a priority. Reference the business impact of latency — e.g. conversion rate, user retention, SLA obligations.]
Performance philosophy: [e.g. "Performance is a feature. Every engineer is responsible for keeping the service within budget. Regressions must be caught in CI before they reach production."]
Key User Journeys
Define the critical paths that the performance budget is designed to protect.
| Journey ID | Journey name | Entry point | Exit point | Criticality |
|---|---|---|---|---|
| UJ-1 | [e.g. New user sign-up] | [Landing page] | [Dashboard] | Critical |
| UJ-2 | [e.g. Core workflow task] | [e.g. /app/tasks] | [e.g. Task complete] | High |
| UJ-3 | [e.g. Search and select] | [e.g. /search] | [e.g. Detail page] | High |
| UJ-4 | [e.g. API data fetch] | [e.g. GET /api/items] | [e.g. 200 response] | Medium |
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 · 286 lines · 83 tokens per session scan A 74fd2b14128d
performance-budget is a skill published in the GitHub repository cnfeat/top-pm-skills (48 stars, last pushed 2mo ago), licensed MIT. It adds 83 tokens to every session and 3,339 once invoked, about $0.0004 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 2026-09-03.
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