Antipattern Prevention
doorkeeper-gem/doorkeeper
Avoid common Ruby and Rails antipatterns that degrade maintainability and performance.
Build or modify backend APIs, services, jobs, persistence, and integrations while preserving contracts, authorization, data integrity, and failure behavior.
Install Build Backend
$ npx skills add hashgraph-online/awesome-codex-plugins --skill build-backend -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install hashgraph-online/awesome-codex-plugins build-backend --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/hashgraph-online/awesome-codex-plugins.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/Phelan164/codex-howto/skills/build-backend .claude/skills/build-backend && 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 "build-backend" agent skill from https://github.com/hashgraph-online/awesome-codex-plugins/tree/main/plugins/Phelan164/codex-howto/skills/build-backend into .claude/skills/build-backend/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "build-backend", 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/hashgraph-online/awesome-codex-plugins/tree/main/plugins/Phelan164/codex-howto/skills/build-backendType 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 hashgraph-online/awesome-codex-plugins --skill build-backend -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install hashgraph-online/awesome-codex-plugins build-backend --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/hashgraph-online/awesome-codex-plugins.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/Phelan164/codex-howto/skills/build-backend .agents/skills/build-backend && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "build-backend" agent skill from https://github.com/hashgraph-online/awesome-codex-plugins/tree/main/plugins/Phelan164/codex-howto/skills/build-backend into .agents/skills/build-backend/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "build-backend", 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 hashgraph-online/awesome-codex-plugins --skill build-backend -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install hashgraph-online/awesome-codex-plugins build-backend --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/hashgraph-online/awesome-codex-plugins.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/Phelan164/codex-howto/skills/build-backend .cursor/skills/build-backend && 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 "build-backend" agent skill from https://github.com/hashgraph-online/awesome-codex-plugins/tree/main/plugins/Phelan164/codex-howto/skills/build-backend into .cursor/skills/build-backend/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "build-backend", 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/hashgraph-online/awesome-codex-plugins.git --path plugins/Phelan164/codex-howto/skills/build-backend--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 hashgraph-online/awesome-codex-plugins --skill build-backend -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install hashgraph-online/awesome-codex-plugins build-backend --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/hashgraph-online/awesome-codex-plugins.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/Phelan164/codex-howto/skills/build-backend .gemini/skills/build-backend && 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 "build-backend" agent skill from https://github.com/hashgraph-online/awesome-codex-plugins/tree/main/plugins/Phelan164/codex-howto/skills/build-backend into .gemini/skills/build-backend/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "build-backend", 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 hashgraph-online/awesome-codex-plugins build-backendInstalls 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 hashgraph-online/awesome-codex-plugins --skill build-backend -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/hashgraph-online/awesome-codex-plugins.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/Phelan164/codex-howto/skills/build-backend .github/skills/build-backend && 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 "build-backend" agent skill from https://github.com/hashgraph-online/awesome-codex-plugins/tree/main/plugins/Phelan164/codex-howto/skills/build-backend into .github/skills/build-backend/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "build-backend", 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 hashgraph-online/awesome-codex-plugins --skill build-backend -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install hashgraph-online/awesome-codex-plugins build-backend --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/hashgraph-online/awesome-codex-plugins.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/Phelan164/codex-howto/skills/build-backend .opencode/skills/build-backend && 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 "build-backend" agent skill from https://github.com/hashgraph-online/awesome-codex-plugins/tree/main/plugins/Phelan164/codex-howto/skills/build-backend into .opencode/skills/build-backend/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "build-backend", 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
build-backend- GitHub stars
- 1.2k
- Token cost
- ~410 tokens
- SKILL.md length
- 141 words
- Files
- 3 (incl. references)
- Skills in repo
- 686
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
Build or modify backend APIs, services, jobs, persistence, and integrations while preserving contracts, authorization, data integrity, and failure behavior.
- Server-side features
- SKILL.md covers Domain contract and Execute and verify
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Database changes
What it does
Build Backend is an agent skill from hashgraph-online/awesome-codex-plugins. Build or modify backend APIs, services, jobs, persistence, and integrations while preserving contracts, authorization, data integrity, and failure behavior. Use for server-side features, database changes, background processing, backend defects, and service refactors; do not use for frontend-only or infrastructure-only work.
Its SKILL.md is about 410 tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files, including reference files (for example `agents/openai.yaml` and `references/contracts-and-data.md`).
It sits in Backend & APIs, covering Refactoring, Backend development and Authorization and RBAC. The repository describes itself as: A curated list of awesome OpenAI Codex / ChatGPT plugins, skills, and resources. The 1 Codex Marketplace. See live plugins at: https://hol.org/plugins/best-codex-plugins. The licence is Apache-2.0.
When your agent uses it
- Server-side features
- Database changes
- Background processing
- Backend defects
Example prompts
- “/build-backend”
What it can do on your machine
Read from SKILL.md and the folder at commit 78497e5. 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
No scripts in the folder and no shell commands in SKILL.md.
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
Build Backend loads about 410 tokens when it runs, and up to ~835 if it reads all its reference files. Until then it costs about 85 tokens; SKILL.md has 141 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 hashgraph-online/awesome-codex-plugins at commit 78497e5, republished under its Apache-2.0 licence (© hashgraph-online). 141 words, ~410 tokens.
Download SKILL.mdSave it as
.claude/skills/build-backend/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.- name
- build-backend
- description
- Build or modify backend APIs, services, jobs, persistence, and integrations while preserving contracts, authorization, data integrity, and failure behavior. Use for server-side features, database changes, background processing, backend defects, and service refactors; do not use for frontend-only or infrastructure-only work.
Build Backend
Domain contract
- Trace changed behavior from input through validation, authorization, domain logic, persistence, side effects, and response mapping.
- Preserve published contracts unless the request explicitly changes them.
- Enforce authorization at a trustworthy server-side boundary.
- Validate untrusted input before domain or persistence operations.
- Keep multi-write operations atomic where partial state would violate invariants.
- Design external calls for timeouts, retries, idempotency, and duplicate delivery where applicable.
- Do not query or mutate production data without explicit authorization.
- Do not fabricate migration, framework, or API behavior; verify version-sensitive details.
- Avoid broad service abstractions that are used once.
Execute and verify
Read references/contracts-and-data.md when the task changes a public API, schema, transaction, job, or integration.
Implement the smallest change at the owning layer. Cover success, invalid input, authorization, and material failure paths. Prefer:
reproducing/focused test → contract/integration test → type/lint → buildFor migrations, validate forward behavior and document rollback or roll-forward strategy.
© hashgraph-online, 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 2 other files (references) in plugins/Phelan164/codex-howto/skills/build-backend of hashgraph-online/awesome-codex-plugins.
- SKILL.md
- agents/openai.yaml
- references/contracts-and-data.md
Open the folder on GitHubat commit 78497e5
Compare with similar skills
Build Backend 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 |
|---|---|---|---|---|---|---|
| Build Backend this skillhashgraph-online/awesome-codex-plugins | 1.2k | — | ~410 | Automated safety check: Pass | Apache-2.0 | |
| Antipattern Preventiondoorkeeper-gem/doorkeeper | 5.5k | — | ~1.1k | Automated safety check: Pass | MIT | |
| Layered Railsevilmartians/redprints-cfp | 108 | 1 repos | ~4.1k | Automated safety check: Pass | None | |
| Engineering PrinciplesAzure/agent-app-orchestrator | 103 | — | ~282 | Automated safety check: Pass | MIT | |
| Spring Data Jparrezartprebreza/spring-boot-skills | 298 | — | ~3k | Automated safety check: Pass | MIT | |
| Configuring Horizoncoollabsio/coolify | 63k | 4 repos | ~898 | Automated safety check: Pass | MIT |
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Categories
Questions about Build Backend
What does Build Backend do?
Build or modify backend APIs, services, jobs, persistence, and integrations while preserving contracts, authorization, data integrity, and failure behavior. Build Backend is an agent skill from hashgraph-online/awesome-codex-plugins. Build or modify backend APIs, services, jobs, persistence, and integrations while preserving contracts, authorization, data integrity, and failure behavior.
When should I use Build Backend?
Build Backend fits situations like: server-side features; database changes; background processing; backend defects.
How do I install Build Backend in Claude Code?
Run `npx skills add hashgraph-online/awesome-codex-plugins --skill build-backend -a claude-code`. Or copy the skill folder (plugins/Phelan164/codex-howto/skills/build-backend in hashgraph-online/awesome-codex-plugins) into .claude/skills/build-backend in your project. Claude Code loads it when a task matches its description.
How do I install Build Backend in Codex?
Run `npx skills add hashgraph-online/awesome-codex-plugins --skill build-backend -a codex`. Or copy the skill folder (plugins/Phelan164/codex-howto/skills/build-backend in hashgraph-online/awesome-codex-plugins) into .agents/skills/build-backend in your project. Codex loads it when a task matches its description.
Can I use Build Backend 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 hashgraph-online/awesome-codex-plugins --skill build-backend -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/build-backend, .gemini/skills/build-backend, .github/skills/build-backend and .opencode/skills/build-backend in your project.
What does Build Backend need to run?
SKILL.md names no scripts, command-line tools or credentials: Build Backend is instructions for the agent only.
Does Build Backend 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 Build Backend 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 Build Backend use?
Build Backend is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Build Backend use?
About 410 tokens (SKILL.md is roughly 1.6k 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 425 tokens, read only when the agent opens those files.
What are the alternatives to Build Backend?
Skills that share tags, products or a category with Build Backend: Antipattern Prevention (doorkeeper-gem/doorkeeper, 5.5k stars), Layered Rails (evilmartians/redprints-cfp, 108 stars), Engineering Principles (Azure/agent-app-orchestrator, 103 stars) and Spring Data Jpa (rrezartprebreza/spring-boot-skills, 298 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Build Backend?
hashgraph-online (a GitHub organization) maintains it in hashgraph-online/awesome-codex-plugins, which has 1,242 GitHub stars. The repository holds 686 skills in this directory. The repository was last updated on October 8, 2026.
Source: hashgraph-online/awesome-codex-plugins on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.