Borrowing it
Nothing to install: this file belongs to PaulJPhilp/EffectPatterns. 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/PaulJPhilp/EffectPatterns/main/.cursorrulesgit clone --depth 1 https://github.com/PaulJPhilp/EffectPatternsWrote 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/rules/pauljphilp/effectpatterns/cursorrules)<a href="https://agentmods.dev/rules/pauljphilp/effectpatterns/cursorrules"><img src="https://agentmods.dev/badge/rules/pauljphilp/effectpatterns/cursorrules/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/rules/pauljphilp/effectpatterns/cursorrules"><img src="https://agentmods.dev/badge/rules/pauljphilp/effectpatterns/cursorrules.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 | $0.00275 | $0.00275 |
| Opus 5.5 | $0.00110 | $0.00110 |
| Sonnet 5.5 | $0.00055 | $0.00055 |
| Haiku 4.5 | $0.00028 | $0.00028 |
Grade A, and why
cursorrules 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 1mo 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
Cursor Rules
HARD CONSTRAINT: Pattern Tool Usage
CRITICAL RULE: If the user mentions "patterns", asks "how to" in Effect, or requests Effect-TS guidance, you are FORBIDDEN from using filesystem tools to find patterns.
FORBIDDEN Tools for Pattern Queries:
- ❌
grep- Never search pattern files - ❌
read_file- Never read pattern files directly - ❌
codebase_search- Never search codebase for patterns - ❌
glob_file_search- Never search for pattern files - ❌
list_diron pattern directories - Never browse pattern directories
REQUIRED Tool for Pattern Queries:
- ✅
mcp_Effect-Patterns-effect-patterns_search_patterns- MUST use this tool - ✅ Display results verbatim - DO NOT summarize or rewrite
Why This Rule Exists:
- The
search_patternstool provides production-tested code and rich-UI blocks - Manual file searching misses critical context, examples, and structured guidance
- Pattern files contain implementation details that should not be exposed directly
- The MCP tool ensures consistent, authoritative pattern presentation
Violation Consequences:
Manual summarization of pattern files is a violation of project safety standards. Always use the authorized MCP tool.
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.
- 1mo ago First seen · 26 lines · 275 tokens per session scan A 4129321b16c4
cursorrules is a cursor rule published in the GitHub repository PaulJPhilp/EffectPatterns (807 stars, last pushed 4mo ago), licensed MIT. It adds 275 tokens to every session, about $0.0011 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 2026-08-30.
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