null-safety SKILL.md skillA
null-safety from rrezartprebreza/spring-boot-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add rrezartprebreza/spring-boot-skills/null-safety@git:20260807.5f992d7Pins git:20260807.5f992d7 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- rrezartprebreza/spring-boot-skills
- Path
skills/spring-boot-3/null-safety/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260807.5f992d7, committed Aug 7, 2026
- Size
- 1,715 bytes
- Repository stars
- 338
- License
- MIT
Use when annotating nullability in Spring Boot 3 / Spring Framework 6 code, integrating Kotlin, or adding static nullability checks without assuming Spring Framework 7 JSpecify defaults.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Null Safety (Boot 3 / Framework 6) Use the nullability model supported by the project. Spring Framework 6 commonly uses `org.springframework.lang.Nullable`, `@NonNull`, and package-level `@NonNullApi`. JSpecify can be introduced deliberately, but do not assume Framework 7 migration semantics in a Boot 3 module. ```java @NonNullApi package com.example.orders; import org.springframework.lang.NonNullApi; ``` Annotate genuine nullable results and parameters with `@Nullable`. Keep repository return types explicit, validate external input at boundaries, and use Kotlin compiler settings that match the annotations when Java and Kotlin are mixed. If the project standardizes JSpecify independently, apply it consistently at module boundaries and document the chosen checker. ## Gotchas - Agent assumes Framework 7 JSpecify defaults - Boot 3 projects usually use Spring's legacy annotations. - Agent uses `@NonNullApi` without importing the package annotation - package metadata must compile and be checked in. - Agent marks every value `@NonNull` - establish a package default and annotate only nullable exceptions. …
Read the whole file at its exact version.
How to install
mdr add rrezartprebreza/spring-boot-skills/null-safety@sha256:e7b18b57211a84c9The line at the top of this page pins the label git:20260807.5f992d7, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_bxc3cmekozwwegce)
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Versions
The registry has recorded 1 version of this file, committed on Aug 7, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (1715 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
rrezartprebreza/spring-boot-skills · 338 stars · license MIT · pushed 2026-11-02 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_bxc3cmekozwwegce GET https://markdownregistry.com/api/v1/resolve?ref=rrezartprebreza/spring-boot-skills/null-safety GET https://markdownregistry.com/api/v1/blob/e7b18b57211a84c9c160f400e4dd22779a4b31c9e02cbc43da89b2ffdd8fd35b
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.