Dr Jskill
jdubois/dr-jskill
Creates Java + Spring Boot projects: Web applications, full-stack apps with Vue.js or Angular or React or vanilla JS, PostgreSQL, REST APIs, and Docker.
A skill your agent uses when you need to design, review, or improve validation in Spring Boot applications — including Bean Validation on request DTOs, @Valid/@Validated at API boundaries…
Install 303 Frameworks Spring Boot Validation
$ npx skills add jabrena/plinth --skill 303-frameworks-spring-boot-validation -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install jabrena/plinth 303-frameworks-spring-boot-validation --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/jabrena/plinth.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/303-frameworks-spring-boot-validation .claude/skills/303-frameworks-spring-boot-validation && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "303-frameworks-spring-boot-validation" agent skill from https://github.com/jabrena/plinth/tree/main/skills/303-frameworks-spring-boot-validation into .claude/skills/303-frameworks-spring-boot-validation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "303-frameworks-spring-boot-validation", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/jabrena/plinth/tree/main/skills/303-frameworks-spring-boot-validationType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add jabrena/plinth --skill 303-frameworks-spring-boot-validation -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install jabrena/plinth 303-frameworks-spring-boot-validation --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/jabrena/plinth.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/303-frameworks-spring-boot-validation .agents/skills/303-frameworks-spring-boot-validation && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "303-frameworks-spring-boot-validation" agent skill from https://github.com/jabrena/plinth/tree/main/skills/303-frameworks-spring-boot-validation into .agents/skills/303-frameworks-spring-boot-validation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "303-frameworks-spring-boot-validation", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add jabrena/plinth --skill 303-frameworks-spring-boot-validation -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install jabrena/plinth 303-frameworks-spring-boot-validation --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/jabrena/plinth.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/303-frameworks-spring-boot-validation .cursor/skills/303-frameworks-spring-boot-validation && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "303-frameworks-spring-boot-validation" agent skill from https://github.com/jabrena/plinth/tree/main/skills/303-frameworks-spring-boot-validation into .cursor/skills/303-frameworks-spring-boot-validation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "303-frameworks-spring-boot-validation", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/jabrena/plinth.git --path skills/303-frameworks-spring-boot-validation--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add jabrena/plinth --skill 303-frameworks-spring-boot-validation -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install jabrena/plinth 303-frameworks-spring-boot-validation --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/jabrena/plinth.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/303-frameworks-spring-boot-validation .gemini/skills/303-frameworks-spring-boot-validation && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "303-frameworks-spring-boot-validation" agent skill from https://github.com/jabrena/plinth/tree/main/skills/303-frameworks-spring-boot-validation into .gemini/skills/303-frameworks-spring-boot-validation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "303-frameworks-spring-boot-validation", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install jabrena/plinth 303-frameworks-spring-boot-validationInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add jabrena/plinth --skill 303-frameworks-spring-boot-validation -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/jabrena/plinth.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/303-frameworks-spring-boot-validation .github/skills/303-frameworks-spring-boot-validation && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "303-frameworks-spring-boot-validation" agent skill from https://github.com/jabrena/plinth/tree/main/skills/303-frameworks-spring-boot-validation into .github/skills/303-frameworks-spring-boot-validation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "303-frameworks-spring-boot-validation", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add jabrena/plinth --skill 303-frameworks-spring-boot-validation -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install jabrena/plinth 303-frameworks-spring-boot-validation --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/jabrena/plinth.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/303-frameworks-spring-boot-validation .opencode/skills/303-frameworks-spring-boot-validation && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "303-frameworks-spring-boot-validation" agent skill from https://github.com/jabrena/plinth/tree/main/skills/303-frameworks-spring-boot-validation into .opencode/skills/303-frameworks-spring-boot-validation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "303-frameworks-spring-boot-validation", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
303-frameworks-spring-boot-validation- GitHub stars
- 446
- Token cost
- ~701 tokens
- SKILL.md length
- 244 words
- Files
- 2 (incl. references)
- Skills in repo
- 124
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
A skill your agent uses when you need to design, review, or improve validation in Spring Boot applications — including Bean Validation on request DTOs, @Valid/@Validated at API boundaries…
- You need to design
- SKILL.md covers Constraints, When to use this skill, Workflow and Reference
- Calls mvn
- Improve validation in Spring Boot applications — including Bean Validation on request DTOs
What it does
303 Frameworks Spring Boot Validation is an agent skill from jabrena/plinth. Use when you need to design, review, or improve validation in Spring Boot applications — including Bean Validation on request DTOs, @Valid/@Validated at API boundaries, constraint groups, custom constraints, @ConfigurationProperties validation, nested DTO validation, and consistent validation error handling. This should trigger for requests such as Add validation support in Spring Boot; Review Spring Boot validation rules; Improve request validation in Spring Boot REST APIs; Add custom Bean Validation constraints…
Its SKILL.md is about 700 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/303-frameworks-spring-boot-validation.md`).
It sits in Backend & APIs, covering Backend development and REST APIs. It works with Spring Boot. The repository describes itself as: Plinth is an AI-native engineering toolkit for modern Java enterprise SDLC, built around reusable Commands, Agents, Skills, and MCP Servers. The licence is Apache-2.0.
When your agent uses it
- You need to design
- Improve validation in Spring Boot applications — including Bean Validation on request DTOs
- @Valid/@Validated at API boundaries
- Constraint groups
Example prompts
- “/303-frameworks-spring-boot-validation”
What it can do on your machine
Read from SKILL.md and the folder at commit dca88dc. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
mvn
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
303 Frameworks Spring Boot Validation loads about 701 tokens when it runs, and up to ~4.4k if it reads all its reference files. Until then it costs about 161 tokens; SKILL.md has 244 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from jabrena/plinth at commit dca88dc, republished under its Apache-2.0 licence (© jabrena). 244 words, ~701 tokens.
Download SKILL.mdSave it as
.claude/skills/303-frameworks-spring-boot-validation/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- 303-frameworks-spring-boot-validation
- description
- Use when you need to design, review, or improve validation in Spring Boot applications — including Bean Validation on request DTOs, @Valid/@Validated at API boundaries, constraint groups, custom constraints, @ConfigurationProperties validation, nested DTO validation, and consistent validation error handling. This should trigger for requests such as Add validation support in Spring Boot; Review Spring Boot validation rules; Improve request validation in Spring Boot REST APIs; Add custom Bean Validation constraints in Spring Boot; Validate configuration properties in Spring Boot. Part of Plinth Toolkit
- license
- Apache-2.0
- metadata.author
- Juan Antonio Breña Moral
- metadata.version
- 0.19.0
Spring Boot Validation Guidelines
Apply Spring Boot validation best practices at API boundaries.
What is covered in this Skill?
- Bean Validation annotations on DTOs and command models
- @Valid / @Validated on controllers and method parameters
- Validation groups for create/update workflows
- Custom constraint annotations and validators
- Consistent 400 error responses for validation failures
Scope: Apply recommendations based on the reference rules and good/bad examples.
Constraints
Before applying validation changes, ensure the project compiles. After improvements, run full verification.
- MANDATORY: Run
./mvnw compileormvn compilebefore applying any change - SAFETY: If compilation fails, stop immediately
- VERIFY: Run
./mvnw clean verifyormvn clean verifyafter applying improvements - BEFORE APPLYING: Read the reference for detailed rules and examples
When to use this skill
- Add validation support in Spring Boot
- Review Spring Boot validation rules
- Improve request validation in Spring Boot REST APIs
- Add custom Bean Validation constraints in Spring Boot
- Validate configuration properties in Spring Boot
- Improve nested DTO validation in Spring Boot
Workflow
- Read reference and assess project context
Read references/303-frameworks-spring-boot-validation.md and inspect the current project setup before proposing changes.
- Gather scope and decide target improvements
Identify requested outcomes, constraints, and the minimum safe set of changes to apply.
- Apply framework-aligned changes
Implement or refactor validation-related configuration/code following the reference patterns and project conventions.
- Run verification and report results
Execute appropriate build/tests and summarize what changed, what was verified, and any follow-up actions.
Reference
For detailed guidance, examples, and constraints, see references/303-frameworks-spring-boot-validation.md.
© jabrena, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 1 other file (references) in skills/303-frameworks-spring-boot-validation of jabrena/plinth.
- SKILL.md
- references/303-frameworks-spring-boot-validation.md
Open the folder on GitHubat commit dca88dc
Compare with similar skills
303 Frameworks Spring Boot Validation next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| 303 Frameworks Spring Boot Validation this skilljabrena/plinth | 446 | — | ~701 | Automated safety check: Pass | Apache-2.0 | |
| Dr Jskilljdubois/dr-jskill | 342 | — | ~4.6k | Automated safety check: Notes | Apache-2.0 | |
| Grails Developer Guideapache/grails-core | 2.9k | — | ~4.9k | Automated safety check: Pass | Apache-2.0 | |
| Spring Boot Skillpiomin/sample-spring-modulith | 144 | — | ~668 | Automated safety check: Pass | None | |
| Progensivaprasadreddy/sivalabs-agent-skills | 188 | — | ~2.7k | Automated safety check: Notes | MIT | |
| Spring Boot Crud Patternsgiuseppe-trisciuoglio/developer-kit | 355 | — | ~2.5k | Automated safety check: Notes | MIT |
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A skill your agent uses when the user wants to create/generate/scaffold a new Spring Boot project (Maven or Gradle, REST API / Web App / Spring Boot + Angular full stack).
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Questions about 303 Frameworks Spring Boot Validation
What does 303 Frameworks Spring Boot Validation do?
A skill your agent uses when you need to design, review, or improve validation in Spring Boot applications — including Bean Validation on request DTOs, @Valid/@Validated at API boundaries…. 303 Frameworks Spring Boot Validation is an agent skill from jabrena/plinth. Use when you need to design, review, or improve validation in Spring Boot applications — including Bean Validation on request DTOs, @Valid/@Validated at API boundaries, constraint groups, custom constraints, @ConfigurationProperties validation, nested DTO validation, and consistent validation error handling.
When should I use 303 Frameworks Spring Boot Validation?
303 Frameworks Spring Boot Validation fits situations like: you need to design; improve validation in Spring Boot applications — including Bean Validation on request DTOs; @Valid/@Validated at API boundaries; constraint groups.
How do I install 303 Frameworks Spring Boot Validation in Claude Code?
Run `npx skills add jabrena/plinth --skill 303-frameworks-spring-boot-validation -a claude-code`. Or copy the skill folder (skills/303-frameworks-spring-boot-validation in jabrena/plinth) into .claude/skills/303-frameworks-spring-boot-validation in your project. Claude Code loads it when a task matches its description.
How do I install 303 Frameworks Spring Boot Validation in Codex?
Run `npx skills add jabrena/plinth --skill 303-frameworks-spring-boot-validation -a codex`. Or copy the skill folder (skills/303-frameworks-spring-boot-validation in jabrena/plinth) into .agents/skills/303-frameworks-spring-boot-validation in your project. Codex loads it when a task matches its description.
Can I use 303 Frameworks Spring Boot Validation in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add jabrena/plinth --skill 303-frameworks-spring-boot-validation -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/303-frameworks-spring-boot-validation, .gemini/skills/303-frameworks-spring-boot-validation, .github/skills/303-frameworks-spring-boot-validation and .opencode/skills/303-frameworks-spring-boot-validation in your project.
What does 303 Frameworks Spring Boot Validation need to run?
Going by SKILL.md and its folder, 303 Frameworks Spring Boot Validation needs the command-line tools its instructions call (mvn).
Does 303 Frameworks Spring Boot Validation access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is 303 Frameworks Spring Boot Validation safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does 303 Frameworks Spring Boot Validation use?
303 Frameworks Spring Boot Validation is published under the Apache-2.0 licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does 303 Frameworks Spring Boot Validation use?
About 701 tokens (SKILL.md is roughly 2.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 3.7k tokens, read only when the agent opens those files.
What are the alternatives to 303 Frameworks Spring Boot Validation?
Skills that share tags, products or a category with 303 Frameworks Spring Boot Validation: Dr Jskill (jdubois/dr-jskill, 342 stars), Grails Developer Guide (apache/grails-core, 2.9k stars), Spring Boot Skill (piomin/sample-spring-modulith, 144 stars) and Progen (sivaprasadreddy/sivalabs-agent-skills, 188 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains 303 Frameworks Spring Boot Validation?
jabrena (a GitHub user) maintains it in jabrena/plinth, which has 446 GitHub stars. The repository holds 124 skills in this directory. The repository was last updated on October 7, 2026.
Source: jabrena/plinth on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.