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Rules file converter

Write a rule once and use it in every coding agent your team runs. Paste a rule in any agent's format and get the file path and frontmatter for 11 targets, keeping when the rule applies. Formats checked against each vendor's docs on 2026-10-19. Nothing leaves your browser.

Your rule (any agent's format, frontmatter included)

---
description: Spring Boot service conventions
globs: src/main/**/*.java, src/main/**/*.kt, src/test/**/*.java, src/test/**/*.kt, src/main/resources/application*.yml, src/main/resources/application*.properties
alwaysApply: false
---

- Use constructor injection with final fields; no @Autowired on fields.
- Bind configuration to @ConfigurationProperties classes or records instead of scattering @Value.
- Use jakarta.* imports, never javax.* for servlet, validation or persistence APIs.
- Use records for request and response DTOs; never return JPA entities from controllers.
- Validate request bodies with @Valid and Bean Validation annotations.
- Handle errors in a @RestControllerAdvice that returns ProblemDetail responses.
- Put @Transactional on service methods, not controllers or repositories.
- Use RestClient for outgoing HTTP calls instead of RestTemplate.
- In tests, use @MockitoBean (not @MockBean), slice tests such as @WebMvcTest or @DataJpaTest, and Testcontainers for real databases.

Rule name (used for the file name)

Scope: Only for matching files (src/main/**/*.java, src/main/**/*.kt, src/test/**/*.java, src/test/**/*.kt, src/main/resources/application*.yml, src/main/resources/application*.properties)

Detected from: globs

Convert to

Save as: .cursor/rules/spring-boot.mdc

---
globs: src/main/**/*.java, src/main/**/*.kt, src/test/**/*.java, src/test/**/*.kt, src/main/resources/application*.yml, src/main/resources/application*.properties
alwaysApply: false
---

- Use constructor injection with final fields; no @Autowired on fields.
- Bind configuration to @ConfigurationProperties classes or records instead of scattering @Value.
- Use jakarta.* imports, never javax.* for servlet, validation or persistence APIs.
- Use records for request and response DTOs; never return JPA entities from controllers.
- Validate request bodies with @Valid and Bean Validation annotations.
- Handle errors in a @RestControllerAdvice that returns ProblemDetail responses.
- Put @Transactional on service methods, not controllers or repositories.
- Use RestClient for outgoing HTTP calls instead of RestTemplate.
- In tests, use @MockitoBean (not @MockBean), slice tests such as @WebMvcTest or @DataJpaTest, and Testcontainers for real databases.

Format source: Cursor docs.

How scope maps between agents

When it applies	Cursor .mdc	Claude Code	GitHub Copilot	Kiro	Antigravity / Devin
Always on	alwaysApply: true	no paths	applyTo: "**"	inclusion: always	trigger: always_on
Matching files	globs	paths	applyTo	inclusion: fileMatch	trigger: glob
Agent decides	description	(use a Skill)	description (VS Code)	inclusion: auto	trigger: model_decision
Manual	no description, no globs	(use a Skill)	neither (VS Code)	inclusion: manual	trigger: manual

AGENTS.md, GEMINI.md and Codex have no frontmatter: put the file in the folder it applies to. Zed reads only the first instruction file it finds, so a .cursorrules file wins over AGENTS.md there.

Rules formats keep changing

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How scope maps between agents

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