Cursor rules examples

PostHogCursor rule

posthog / rules

PostHog/posthog/.cursor/rules/django-python.mdc

Rules for writing Python services at PostHog (Python servers powered by the Django framework)

PostHogCursor rule

posthog / rules

PostHog/posthog/.cursor/rules/react-typescript.mdc

Rules for writing frontend code at PostHog (mostly React + Typescript with Kea)

PostHogCursor rule

posthog / 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 rule

ai-chatbot / rules

vercel/ai-chatbot/.cursor/rules/ultracite.mdc

Ultracite Rules - AI-Ready Formatter and Linter

MicrosoftCursor rule

data-formulator / rules

microsoft/data-formulator/.cursor/rules/backend-test-conventions.mdc

Backend Python test conventions (pytest)

No other project uses it yet

MicrosoftCursor rule

data-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 data_formulator.datalake.parquet_utils: pandas.DataFrame.to_json(orient='records') defaults to date_format='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. df_to_safe_records enforces date_format='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…

No other project uses it yet

MicrosoftCursor rule

data-formulator / rules

microsoft/data-formulator/.cursor/rules/dev-guides-first.mdc

Require reading dev-guides before development and keeping docs in sync

No other project uses it yet

MicrosoftCursor rule

data-formulator / rules

microsoft/data-formulator/.cursor/rules/error-response-safety.mdc

Prevent information exposure through exception messages in HTTP responses

MicrosoftCursor rule

data-formulator / rules

microsoft/data-formulator/.cursor/rules/frontend-test-conventions.mdc

Frontend TypeScript test conventions (Vitest)

MicrosoftCursor rule

data-formulator / rules

microsoft/data-formulator/.cursor/rules/i18n-no-hardcoded-strings.mdc

No hardcoded UI strings — use i18n translation keys

MicrosoftCursor rule

data-formulator / rules

microsoft/data-formulator/.cursor/rules/implementation-review-checklist.mdc

Require structural code review after implementation before final response

MicrosoftCursor rule

data-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 rule

data-formulator / rules

microsoft/data-formulator/.cursor/rules/language-injection-conventions.mdc

Language injection conventions for LLM Agent prompts

MicrosoftCursor rule

data-formulator / rules

microsoft/data-formulator/.cursor/rules/log-sanitization.mdc

Prevent sensitive data leakage in server-side log messages

MicrosoftCursor rule

data-formulator / rules

microsoft/data-formulator/.cursor/rules/package-manager-conventions.mdc

Use Yarn only, never npm/pnpm

MicrosoftCursor rule

data-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 rule

data-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 rule

data-formulator / rules

microsoft/data-formulator/.cursor/rules/unified-error-protocol.mdc

Unified error handling protocol for backend and frontend