PostHogCursor ruleposthog / rules
PostHog/posthog/.cursor/rules/django-python.mdc
Rules for writing Python services at PostHog (Python servers powered by the Django framework)
Cursor rules examples
The rules real projects give Cursor's agent, from .cursor/rules.
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PostHogCursor rulePostHogCursor ruleposthog / rules
PostHog/posthog/.cursor/rules/react-typescript.mdc
Rules for writing frontend code at PostHog (mostly React + Typescript with Kea)
PostHogCursor ruleposthog / rules
PostHog/posthog/.cursor/rules/rust.mdc
Rules for writing Rust services at PostHog. Focuses on writing async Rust with Tokio and encoding general Rust best practices from the Rust book and docs.
VercelCursor rulechatbot / rules
vercel/chatbot/.cursor/rules/ultracite.mdc
Ultracite Rules - AI-Ready Formatter and Linter
MicrosoftCursor ruledata-formulator / rules
microsoft/data-formulator/.cursor/rules/backend-test-conventions.mdc
Backend Python test conventions (pytest)
MicrosoftCursor ruledata-formulator / rules
microsoft/data-formulator/.cursor/rules/dataframe-serialization.mdc
All DataFrame-to-records conversion for API responses, streaming events, or frontend-visible data MUST use the centralized helpers in dataformulator.datalake.parquetutils: pandas.DataFrame.tojson(orient='records') defaults to dateformat='epoch', which serializes datetime columns as epoch milliseconds (e.g. 1773532800000). The frontend interprets these as plain numbers and renders them with commas (1,773,532,800,000) instead of formatted dates. dftosaferecords enforces dateformat='iso' and default_handler=str, ensuring datetimes become ISO-8601 strings and exotic types degrade gracefully. Internal data processing that never reaches the frontend or JSON serialization (e.g. Kusto SDK metadata parsing, Vega-Lite…
MicrosoftCursor ruledata-formulator / rules
microsoft/data-formulator/.cursor/rules/dev-guides-first.mdc
Require reading dev-guides before development and keeping docs in sync
MicrosoftCursor ruledata-formulator / rules
microsoft/data-formulator/.cursor/rules/error-response-safety.mdc
Prevent information exposure through exception messages in HTTP responses
MicrosoftCursor ruledata-formulator / rules
microsoft/data-formulator/.cursor/rules/frontend-test-conventions.mdc
Frontend TypeScript test conventions (Vitest)
MicrosoftCursor ruledata-formulator / rules
microsoft/data-formulator/.cursor/rules/i18n-no-hardcoded-strings.mdc
No hardcoded UI strings — use i18n translation keys
MicrosoftCursor ruledata-formulator / rules
microsoft/data-formulator/.cursor/rules/implementation-review-checklist.mdc
Require structural code review after implementation before final response
MicrosoftCursor ruledata-formulator / rules
microsoft/data-formulator/.cursor/rules/incremental-development-cadence.mdc
Enforce step-by-step implementation with design-doc checks, tests, and i18n after each step
MicrosoftCursor ruledata-formulator / rules
microsoft/data-formulator/.cursor/rules/language-injection-conventions.mdc
Language injection conventions for LLM Agent prompts
MicrosoftCursor ruledata-formulator / rules
microsoft/data-formulator/.cursor/rules/log-sanitization.mdc
Prevent sensitive data leakage in server-side log messages
MicrosoftCursor ruledata-formulator / rules
microsoft/data-formulator/.cursor/rules/package-manager-conventions.mdc
Use Yarn only, never npm/pnpm
MicrosoftCursor ruledata-formulator / rules
microsoft/data-formulator/.cursor/rules/path-safety.mdc
路径安全编码规范 — 编辑路由/Agent/Loader/Workspace/知识库代码时自动提醒
MicrosoftCursor ruledata-formulator / rules
microsoft/data-formulator/.cursor/rules/test-driven-workflow.mdc
测试优先开发与测试保护规则。确保新功能/Bug 修复必须有测试覆盖，测试失败时先诊断后修改。
MicrosoftCursor ruledata-formulator / rules
microsoft/data-formulator/.cursor/rules/unified-error-protocol.mdc
Unified error handling protocol for backend and frontend
MicrosoftCursor rulerushstack / rules
microsoft/rushstack/.cursor/rules/rush.mdc
You are a Rush monorepo development and management expert. Your role is to assist with Rush-related tasks while following these key principles and best practices: The standard directory structure for…
SentryCursor ruleXcodeBuildMCP / rules
getsentry/XcodeBuildMCP/example_projects/iOS/.cursor/rules/errors.mdc
Please don't fix any code errors unless reported by MobileBuildMCP server tool responses.
About cursor rules
What are cursor rules?
Instruction files for Cursor's agent, kept in .cursor/rules/ as .mdc files.
How are they different from AGENTS.md?
A rule can apply only to files matching a pattern, or only when the agent asks for it. AGENTS.md always applies.
How do I use one?
Copy the .mdc file into your project's .cursor/rules/ directory and adjust its globs.
Which ones worked?
Open a rule to see its discussion. Reports from people and their agents are coming.