Agent skill

REST API Conventions

by rrezartprebreza in rrezartprebreza/spring-boot-skills

A skill your agent uses when generating REST controllers, DTOs, success response contracts, pagination, HTTP status mapping, or API versioning.

MITAuto-check passedBackend & APIs

Install REST API Conventions

skills CLI

$ npx skills add rrezartprebreza/spring-boot-skills --skill rest-api-conventions -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install rrezartprebreza/spring-boot-skills rest-api-conventions --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/rrezartprebreza/spring-boot-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/spring-boot-3/rest-api-conventions .claude/skills/rest-api-conventions && rm -rf skills-src

Use ~/.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/

Paste into Claude Code

Install the "rest-api-conventions" agent skill from https://github.com/rrezartprebreza/spring-boot-skills/tree/main/skills/spring-boot-3/rest-api-conventions into .claude/skills/rest-api-conventions/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "rest-api-conventions", 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

$skill-installer install https://github.com/rrezartprebreza/spring-boot-skills/tree/main/skills/spring-boot-3/rest-api-conventions

Type 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.

skills CLI

$ npx skills add rrezartprebreza/spring-boot-skills --skill rest-api-conventions -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install rrezartprebreza/spring-boot-skills rest-api-conventions --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/rrezartprebreza/spring-boot-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/spring-boot-3/rest-api-conventions .agents/skills/rest-api-conventions && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "rest-api-conventions" agent skill from https://github.com/rrezartprebreza/spring-boot-skills/tree/main/skills/spring-boot-3/rest-api-conventions into .agents/skills/rest-api-conventions/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "rest-api-conventions", 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.

skills CLI

$ npx skills add rrezartprebreza/spring-boot-skills --skill rest-api-conventions -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install rrezartprebreza/spring-boot-skills rest-api-conventions --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/rrezartprebreza/spring-boot-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/spring-boot-3/rest-api-conventions .cursor/skills/rest-api-conventions && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "rest-api-conventions" agent skill from https://github.com/rrezartprebreza/spring-boot-skills/tree/main/skills/spring-boot-3/rest-api-conventions into .cursor/skills/rest-api-conventions/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "rest-api-conventions", 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

$ gemini skills install https://github.com/rrezartprebreza/spring-boot-skills.git --path skills/spring-boot-3/rest-api-conventions

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add rrezartprebreza/spring-boot-skills --skill rest-api-conventions -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install rrezartprebreza/spring-boot-skills rest-api-conventions --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/rrezartprebreza/spring-boot-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/spring-boot-3/rest-api-conventions .gemini/skills/rest-api-conventions && rm -rf skills-src

Use ~/.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/

Paste into Gemini CLI

Install the "rest-api-conventions" agent skill from https://github.com/rrezartprebreza/spring-boot-skills/tree/main/skills/spring-boot-3/rest-api-conventions into .gemini/skills/rest-api-conventions/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "rest-api-conventions", 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.

GitHub CLI

$ gh skill install rrezartprebreza/spring-boot-skills rest-api-conventions

Installs 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).

skills CLI

$ npx skills add rrezartprebreza/spring-boot-skills --skill rest-api-conventions -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/rrezartprebreza/spring-boot-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/spring-boot-3/rest-api-conventions .github/skills/rest-api-conventions && rm -rf skills-src

Use ~/.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/

Paste into GitHub Copilot

Install the "rest-api-conventions" agent skill from https://github.com/rrezartprebreza/spring-boot-skills/tree/main/skills/spring-boot-3/rest-api-conventions into .github/skills/rest-api-conventions/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "rest-api-conventions", 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.

skills CLI

$ npx skills add rrezartprebreza/spring-boot-skills --skill rest-api-conventions -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install rrezartprebreza/spring-boot-skills rest-api-conventions --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/rrezartprebreza/spring-boot-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/spring-boot-3/rest-api-conventions .opencode/skills/rest-api-conventions && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "rest-api-conventions" agent skill from https://github.com/rrezartprebreza/spring-boot-skills/tree/main/skills/spring-boot-3/rest-api-conventions into .opencode/skills/rest-api-conventions/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "rest-api-conventions", 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: rest-api-conventions
GitHub stars: 298
Token cost: ~1.5k tokens
SKILL.md length: 343 words
Files: 7
Skills in repo: 51
Repo updated: Sep 21, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

A skill your agent uses when generating REST controllers, DTOs, success response contracts, pagination, HTTP status mapping, or API versioning.

Generating REST controllers
SKILL.md covers Project Contract, ApiResponse Wrapper, HTTP Status Mapping and URL Conventions, plus 3 more sections
Runs Java scripts from its folder
Success response contracts

What it does

REST API Conventions is an agent skill from rrezartprebreza/spring-boot-skills. Use when generating REST controllers, DTOs, success response contracts, pagination, HTTP status mapping, or API versioning. For RFC 9457 exception and error response formatting, use problem-details-rfc9457 unless the project explicitly requires a legacy error envelope.

Its SKILL.md is about 1.5k tokens, which your agent loads only when the skill is triggered. The skill folder holds 9 other files (for example `agents/openai.yaml`).

It sits in Backend & APIs, covering REST APIs and Backend development. It works with Spring Boot. The repository describes itself as: Production-grade Claude Code and Codex skills for Spring Boot developers. The licence is MIT.

When your agent uses it

Generating REST controllers
Success response contracts
HTTP status mapping

Example prompts

“/rest-api-conventions”

What it can do on your machine

Read from SKILL.md and the folder at commit f0c06a0. 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
Ships script files (Java), which the agent can run.
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

REST API Conventions loads about 1.5k tokens when it runs. Until then it costs about 73 tokens; SKILL.md has 343 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~73
When it runs · the whole SKILL.md, loaded when a task matches: ~1.5k

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 rrezartprebreza/spring-boot-skills at commit f0c06a0, republished under its MIT licence (© rrezartprebreza). 343 words, ~1,473 tokens.

Download SKILL.mdSave it as .claude/skills/rest-api-conventions/SKILL.md (or your agent's skills folder). This skill also uses 6 other files; get the full folder from GitHub.

name: rest-api-conventions
description: Use when generating REST controllers, DTOs, success response contracts, pagination, HTTP status mapping, or API versioning. For RFC 9457 exception and error response formatting, use problem-details-rfc9457 unless the project explicitly requires a legacy error envelope.

REST API Conventions

Project Contract

Inspect existing controllers, tests and OpenAPI before choosing a response contract. Preserve the project's IDs, response shape and versioning strategy. Do not migrate unrelated endpoints while adding one route. The envelope below is an optional convention for a project that uses it; plain success DTOs are equally valid. A 204 response has no body.

Success and error formats are independent: an existing success envelope can coexist with RFC 9457 errors. Use one consistent error policy; choose the legacy error examples below only when the project already requires that format.

Example success envelope:

json

{
  "success": true,
  "data": { },
  "error": null,
  "timestamp": "2026-04-13T10:00:00Z"
}

Error response:

json

{
  "success": false,
  "data": null,
  "error": {
    "code": "ORDER_NOT_FOUND",
    "message": "Order with id 123 not found",
    "details": []
  },
  "timestamp": "2026-04-13T10:00:00Z"
}

ApiResponse Wrapper

java

@JsonInclude(JsonInclude.Include.NON_NULL)
public record ApiResponse<T>(
    boolean success,
    T data,
    ApiError error,
    Instant timestamp
) {
    public static <T> ApiResponse<T> ok(T data) {
        return new ApiResponse<>(true, data, null, Instant.now());
    }

    public static <T> ApiResponse<T> error(String code, String message) {
        return new ApiResponse<>(false, null, new ApiError(code, message, List.of()), Instant.now());
    }
}

public record ApiError(String code, String message, List<String> details) {}

HTTP Status Mapping

Scenario	Status
GET — found	200
POST — created resource	201
PUT/PATCH — updated	200
DELETE — deleted	204 (no body)
Validation failure	400
Unauthenticated	401
Forbidden	403
Not found	404
Conflict (duplicate)	409
Unhandled server error	500

URL Conventions

Plural nouns for resources: /orders, /users, /products
Kebab-case for multi-word: /order-items, not /orderItems
Versioning in path: /api/v1/orders
Nested resources max 2 levels: /orders/{id}/items ✅, /orders/{id}/items/{itemId}/notes ❌ — flatten to /order-item-notes/{id}
IDs: preserve the existing ID type. UUIDs are an option, not an authorization mechanism.

GET    /api/v1/orders              → list (paginated)
POST   /api/v1/orders              → create
GET    /api/v1/orders/{id}         → get one
PUT    /api/v1/orders/{id}         → full update
PATCH  /api/v1/orders/{id}         → partial update
DELETE /api/v1/orders/{id}         → delete
GET    /api/v1/orders/{id}/items   → nested resource

Pagination

json

{
  "success": true,
  "data": {
    "content": [...],
    "page": 0,
    "size": 20,
    "totalElements": 150,
    "totalPages": 8,
    "last": false
  }
}

Query params: ?page=0&size=20&sort=createdAt,desc

Use Spring Data Pageable in controllers:

java

@GetMapping
public ApiResponse<PageResponse<OrderResponse>> list(Pageable pageable) {
    return ApiResponse.ok(PageResponse.from(orderService.findAll(pageable).map(OrderResponse::from)));
}

Cap the page size. A bare Pageable accepts ?size=100000 from any client — one request can drag your whole table into memory. Spring's default cap is 2000, still too high for most APIs:

yaml

spring:
  data:
    web:
      pageable:
        default-page-size: 20
        max-page-size: 100   # requests above this are silently clamped

The compiled PageResponse fixes the JSON pagination contract. Mapping entities to DTOs alone does not stabilize Spring Data PageImpl serialization. Spring Data's org.springframework.data.web.PagedModel is another option when its shape fits the API. Validate sort fields against an allowlist and add an ID tie-breaker to non-unique sorts.

Legacy Envelope Exception Handler

java

@RestControllerAdvice
@RequiredArgsConstructor
public class GlobalExceptionHandler {

    @ExceptionHandler(EntityNotFoundException.class)
    public ResponseEntity<ApiResponse<Void>> handleNotFound(EntityNotFoundException ex) {
        return ResponseEntity.status(404).body(ApiResponse.error("NOT_FOUND", ex.getMessage()));
    }

    @ExceptionHandler(MethodArgumentNotValidException.class)
    public ResponseEntity<ApiResponse<Void>> handleValidation(MethodArgumentNotValidException ex) {
        List<String> details = ex.getBindingResult().getFieldErrors().stream()
            .map(e -> e.getField() + ": " + e.getDefaultMessage()).toList();
        return ResponseEntity.status(400)
            .body(new ApiResponse<>(false, null, new ApiError("VALIDATION_FAILED", "Invalid input", details), Instant.now()));
    }

    @ExceptionHandler(Exception.class)
    public ResponseEntity<ApiResponse<Void>> handleGeneric(Exception ex) {
        return ResponseEntity.status(500).body(ApiResponse.error("INTERNAL_ERROR", "An unexpected error occurred"));
    }
}

Gotchas

Agent imposes a new envelope - preserve the existing success contract.
Agent invents competing error handlers - use the project's established error contract.
Agent puts exception handlers in controllers — always use @RestControllerAdvice
Agent changes ID types while adding an endpoint - retain the existing ID scheme.
Agent accepts unbounded Pageable — set spring.data.web.pageable.max-page-size or one request can pull the whole table
Agent serializes PageImpl directly - map entities to DTOs, then wrap in PageResponse.

Files

SKILL.md and 6 other files in skills/spring-boot-3/rest-api-conventions of rrezartprebreza/spring-boot-skills.

SKILL.md
agents/openai.yaml
examples/bad-controller.java
examples/good-controller.java
templates/ApiResponse.java
templates/GlobalExceptionHandler.java
templates/PageResponse.java

Open the folder on GitHubat commit f0c06a0

Compare with similar skills

REST API Conventions 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.

REST API Conventions compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
REST API Conventions this skillrrezartprebreza/spring-boot-skills	298	—	~1.5k	Automated safety check: Pass	MIT	18 days ago
Dr Jskilljdubois/dr-jskill	342	—	~4.6k	Automated safety check: Notes	Apache-2.0	10 days ago
Grails Developer Guideapache/grails-core	2.9k	—	~4.9k	Automated safety check: Pass	Apache-2.0	today
Spring Boot Skillpiomin/sample-spring-modulith	144	—	~668	Automated safety check: Pass	None	14 days ago
Progensivaprasadreddy/sivalabs-agent-skills	188	—	~2.7k	Automated safety check: Notes	MIT	4 days ago
Spring Boot Crud Patternsgiuseppe-trisciuoglio/developer-kit	356	—	~2.5k	Automated safety check: Notes	MIT	29 days ago

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Works with

Spring Boot

Questions about REST API Conventions

What does REST API Conventions do?

A skill your agent uses when generating REST controllers, DTOs, success response contracts, pagination, HTTP status mapping, or API versioning. REST API Conventions is an agent skill from rrezartprebreza/spring-boot-skills. Use when generating REST controllers, DTOs, success response contracts, pagination, HTTP status mapping, or API versioning.

When should I use REST API Conventions?

REST API Conventions fits situations like: generating REST controllers; success response contracts; HTTP status mapping.

How do I install REST API Conventions in Claude Code?

Run `npx skills add rrezartprebreza/spring-boot-skills --skill rest-api-conventions -a claude-code`. Or copy the skill folder (skills/spring-boot-3/rest-api-conventions in rrezartprebreza/spring-boot-skills) into .claude/skills/rest-api-conventions in your project. Claude Code loads it when a task matches its description.

How do I install REST API Conventions in Codex?

Run `npx skills add rrezartprebreza/spring-boot-skills --skill rest-api-conventions -a codex`. Or copy the skill folder (skills/spring-boot-3/rest-api-conventions in rrezartprebreza/spring-boot-skills) into .agents/skills/rest-api-conventions in your project. Codex loads it when a task matches its description.

Can I use REST API Conventions 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 rrezartprebreza/spring-boot-skills --skill rest-api-conventions -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/rest-api-conventions, .gemini/skills/rest-api-conventions, .github/skills/rest-api-conventions and .opencode/skills/rest-api-conventions in your project.

What does REST API Conventions need to run?

Going by SKILL.md and its folder, REST API Conventions needs Java for the scripts in its folder.

Does REST API Conventions 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 REST API Conventions 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 REST API Conventions use?

REST API Conventions is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does REST API Conventions use?

About 1.5k tokens (SKILL.md is roughly 5.9k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to REST API Conventions?

Skills that share tags, products or a category with REST API Conventions: 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 REST API Conventions?

rrezartprebreza (a GitHub user) maintains it in rrezartprebreza/spring-boot-skills, which has 298 GitHub stars. The repository holds 51 skills in this directory. The repository was last updated on September 21, 2026.

Source: rrezartprebreza/spring-boot-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install REST API Conventions

Facts

At a glance

What it does

When your agent uses it

Example prompts

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

REST API Conventions

Project Contract

ApiResponse Wrapper

HTTP Status Mapping

URL Conventions

Pagination

Legacy Envelope Exception Handler

Gotchas

Files

Compare with similar skills

Similar skills

More from rrezartprebreza/spring-boot-skills

Related

Questions about REST API Conventions