build-backend SKILL.md skillA
build-backend from phelan164/codex-howto is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add phelan164/codex-howto/build-backend@git:20260731.42e092cPins git:20260731.42e092c in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- phelan164/codex-howto
- Path
skills/build-backend/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260731.42e092c, committed Jul 31, 2026
- First version recorded
- Jul 24, 2026
- Size
- 1,643 bytes
- Repository stars
- 20
- License
- MIT
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.
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
# 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](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: ```text reproducing/focused test → contract/integration test → type/lint → build ``` …
Read the whole file at its exact version.
How to install
mdr add phelan164/codex-howto/build-backend@sha256:ada1a71cf76df64eThe line at the top of this page pins the label git:20260731.42e092c, 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_do335yffv5udz2er)
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Versions
The registry has recorded 2 versions of this file, between Jul 24, 2026 and Jul 31, 2026, about one every 7 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260731.42e092c latest | 2026-07-31 | 42e092c | 1,643 B | A | view · diff |
| git:20260724.a8a7148 | 2026-07-24 | a8a7148 | 2,492 B | A | view |
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 (1643 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
phelan164/codex-howto · 20 stars · license MIT · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_do335yffv5udz2er GET https://markdownregistry.com/api/v1/resolve?ref=phelan164/codex-howto/build-backend GET https://markdownregistry.com/api/v1/blob/ada1a71cf76df64ec554705bc8864833655dc3e195fd171f10c9f53024b0017f
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.