Borrowing it
Nothing to install: this file belongs to v0idOS/performance-deity. 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/v0idOS/performance-deity/main/CLAUDE.mdgit clone --depth 1 https://github.com/v0idOS/performance-deityWrote 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/instructions/v0idos/performance-deity/claude-md)<a href="https://agentmods.dev/instructions/v0idos/performance-deity/claude-md"><img src="https://agentmods.dev/badge/instructions/v0idos/performance-deity/claude-md/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/instructions/v0idos/performance-deity/claude-md"><img src="https://agentmods.dev/badge/instructions/v0idos/performance-deity/claude-md.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 | $0.03343 | $0.03343 |
| Opus 5.5 | $0.01337 | $0.01337 |
| Sonnet 5.5 | $0.00669 | $0.00669 |
| Haiku 4.5 | $0.00334 | $0.00334 |
Grade A, and why
performance-deity CLAUDE.md 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 2mo 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 — 348 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Performance Deity — CLAUDE.md
Drop this file into your project root. Claude Code reads it automatically at the start of every session.
Global Rules
Apply these rules to every task in this project, regardless of which section below is triggered:
- Never suggest a code change for performance without benchmarking the existing code first.
- Every optimization must include a before/after comparison table with real numbers (time, memory, or bytes).
- Prefer algorithmic improvements over micro-optimizations. Fixing O(n²) to O(n log n) takes priority over any constant-factor trick.
- If a proposed change does not measurably beat the baseline, discard it and try a different approach. Do not present the failed attempt.
- Every final report must include a one-paragraph explanation of why the change is faster, grounded in CPU architecture, memory layout, or I/O behavior.
When to Apply Each Section
Apply the relevant section based on what the user is asking about.
| Section | Apply when the user is working on... |
|---|---|
| Hot-Path Optimizer | Slow functions, execution time, algorithmic efficiency |
| Leak Hunter | Memory leaks, high RAM usage, OOM errors, GC pauses |
| Race Condition Killer | Threading, async concurrency, race conditions, deadlocks |
| N+1 Slayer | Slow database queries, ORM performance, missing indexes |
| Chaos Engineer | Input hardening, resilience, stress testing, fuzzing |
| Network Squeezer | API payload size, bandwidth, HTTP caching, serialization |
| CI/CD Accelerator | Build times, Docker, Webpack, GitHub Actions pipelines |
| Telemetry | Observability, logging, tracing, production monitoring |
| Frame-Rate Enforcer | UI rendering performance, React re-renders, CSS animations |
Hot-Path Optimizer ⚡
Execute all four phases in order. Do not skip any phase.
Phase 1 — Establish Baseline
- Identify the exact code to optimize.
- Run a micro-benchmark using the included tools:
- Write a temporary micro-benchmark script in the user's workspace (e.g.,
.perf-benchmark.pyor.perf-benchmark.js). - The script MUST contain a warm-up phase (discard ≥10 iterations).
- The script MUST run ≥100 iterations and output the Average and P95 execution time.
- Run the script using the terminal.
- Delete the temporary script after recording the results.
- Write a temporary micro-benchmark script in the user's workspace (e.g.,
- Record P95 and Average. Do not proceed until the benchmark runs without error.
- Report baseline numbers before writing any new code.
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.
- 2mo ago First seen · 348 lines · 3,343 tokens per session scan A 2210d78997bf
performance-deity CLAUDE.md is an instructions file published in the GitHub repository v0idOS/performance-deity (2 stars, last pushed 6mo ago), licensed MIT. It adds 3,343 tokens to every session, about $0.0134 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.
performance-deity CLAUDE.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| performance-deity CLAUDE.mdv0idOS/performance-deity | Instructions file | 2 | 6mo ago | MIT | A | 3,343 | Claude Code |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 9,719 | GitHub Copilot |
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| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | today | MIT | A | 7,461 | Codex, OpenCode |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | today | MIT | A | 4,680 | Codex, OpenCode |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 3,093 | GitHub Copilot |
| vscode model-prompts.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 2,022 | GitHub Copilot |