The rules real projects give Cursor's agent, from .cursor/rules.
Files you open will collect here, so you can find them again.
Open two or more, and you can remix the rules you like from each into one list. Kept in this browser only.
lilishopCursor rulelilishop/lilishop/.cursor/rules/03-development-guidelines.mdc
Write unit tests for critical business logic 2. Ensure API endpoints are properly documented 3. Test both success and error scenarios
No other project uses it yet
johnlindquistCursor rulejohnlindquist/kit/.cursor/rules/derived-cursor-rules.mdc
AI rules derived by SpecStory from the project AI interaction history
No other project uses it yet
groupultraReads credentialsCursor rulegroupultra/telegram-search/.cursor/rules/backend-server.mdc
browser modes where applicable (database, embedding, Telegram API). - When adding new configuration options: - Document them in `.env.example`. - Provide safe defaults that will not break existing deployments. ### Error Handling & Observability
No other project uses it yet
groupultraCursor rulegroupultra/telegram-search/.cursor/rules/core.mdc
safety and portability. - Reserve raw SQL for performance-critical paths and keep them well-documented. - When adding migrations: - Update TypeScript schemas/models first. - Use `drizzle-kit` to generate SQL migrations
t3-ossCursor rulet3-oss/t3-env/.cursor/rules/general.mdc
achieve strong and generic typing for your chosen API? If not, reconsider. - Create clearly documented changesets for your introduced changes using `bun changeset`. ## Coding Standards ### Naming Conventions - Variables, functions, methods
Steady10 mentions in 2 weeks
No other project uses it yet
OpnFormReads credentialsCursor ruleOpnForm/OpnForm/.cursor/rules/docs.mdc
technical writing assistant You are an AI writing assistant specialized in creating exceptional technical documentation using Mintlify components and following industry-leading technical writing practices. ## Core writing principles ### Language
Steady4 mentions in 2 weeks
No other project uses it yet
OpnFormCursor ruleOpnForm/OpnForm/.cursor/rules/formula-engine.mdc
Formula engine for computed variables - architecture, implementation, and extension guide. Use when working with formulas, computed variables, or extending formula functions.
Steady4 mentions in 2 weeks
No other project uses it yet
haydenbleaselCursor rulehaydenbleasel/kibo/.cursor/rules/ultracite.mdc
Ultracite Rules
1 project uses a version of this
grafanaCursor rulegrafana/oncall/.cursor/rules/planit-mode.mdc
A structured approach to task planning and execution for PlanIt tasks
leaperoneCursor ruleleaperone/MultiPost-Extension/.cursor/rules/chrome-extension.mdc
Structure files logically: popup, background, content scripts, utils - Implement proper error handling and logging - Document code with JSDoc comments Architecture and Best Practices - Strictly follow Manifest V3 specifications - Divide responsibilities
No other project uses it yet
wp-graphqlCursor rulewp-graphql/wp-graphql/.cursor/rules/README.md
behavior in `wpgraphql.mdc`. ## Learn More For more information about Cursor rules, visit the [Cursor documentation](https://docs.cursor.com/context/rules-for-ai). For information about the monorepo structure, see [docs/ARCHITECTURE.md](../../docs/ARCHITECTURE.md) in the repository
No other project uses it yet
DataDogCursor ruleDataDog/datadog-agent/.cursor/rules/agent_corecheck.mdc
This rule serves for development of agent core checks.
No other project uses it yet
DataDogCursor ruleDataDog/datadog-agent/.cursor/rules/e2e_tests.mdc
Guidelines for working with E2E tests in the datadog-agent repository
Steady3 mentions in 2 weeks
No other project uses it yet
DataDogCursor ruleDataDog/datadog-agent/.cursor/rules/system_probe_modules.mdc
This rule serves for development of new system-probe modules that use eBPF, and need to send data to the backend
Steady3 mentions in 2 weeks
No other project uses it yet
superagent-aiCursor rulesuperagent-ai/grok-cli/.cursor/rules/tools-and-agent.mdc
Guidelines for the agent system and tool implementations
LegendAppCursor ruleLegendApp/legend-list/.cursor/rules/changelog.mdc
improvement description] - Improvement: [Enhancement description] ``` ### 6. Quality Check - Ensure all user-facing changes are documented - Verify technical accuracy of descriptions - Check that breaking changes are clearly marked - Review for consistency
Steady10 mentions in 2 weeks
No other project uses it yet
NVIDIACursor ruleNVIDIA/physicsnemo/.cursor/rules/mod-003a-missing-or-incomplete-docstring.mdc
Every model/layer requires comprehensive docstrings following NumPy style with Sphinx RST formatting, including all sub-rules MOD-003b through MOD-003k.
NVIDIACursor ruleNVIDIA/physicsnemo/.cursor/rules/mod-003c-missing-required-class-docstring-sections.mdc
Class docstrings must contain three mandatory sections - Parameters, Forward, and Outputs. Optional sections include Notes, Examples, ..important::, and ..code-block::.
NVIDIACursor ruleNVIDIA/physicsnemo/.cursor/rules/mod-003d-missing-required-method-docstring-sections.mdc
All methods must have docstrings with at least Parameters and Returns sections. Optional sections include Notes, Examples, ..important::, and ..code-block::.
NVIDIACursor ruleNVIDIA/physicsnemo/.cursor/rules/mod-003f-callback-functions-must-have-code-block-specification.mdc
Callback function parameters must include a ..code-block:: specification showing the required signature and return type, placed outside Parameters/Forward/Outputs sections.
Instruction files for Cursor's agent, kept in .cursor/rules/ as .mdc files.
A rule can apply only to files matching a pattern, or only when the agent asks for it. AGENTS.md always applies.
Copy the .mdc file into your project's .cursor/rules/ directory and adjust its globs.
Open a rule to see its discussion. Reports from people and their agents are coming.
