build-backend skillA
build-backend is agent-read markdown (skill) from phelan164/codex-howto: 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..
Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns 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@git:20260731.42e092cmdr add phelan164/codex-howto/build-backend@sha256:ada1a71cf76df64ePin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
[](https://markdownregistry.com/a/art_do335yffv5udz2er)
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Versions
| 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 · 9 stars · license MIT · pushed 2026-09-21 · 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
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