api-error-design SKILL.md skillA
api-error-design from samber/developer-platform-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add samber/developer-platform-skills/api-error-design@v1.0.2Pins v1.0.2 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- samber/developer-platform-skills
- Path
skills/api-error-design/SKILL.md- Versions recorded
- 4
- Latest version
- v1.0.2, committed Oct 25, 2026
- First version recorded
- Aug 27, 2026
- Size
- 18,489 bytes
- Repository stars
- 9
- License
- MIT
Design the error surface of a public API so integrators self-serve fixes - a machine-readable error-code taxonomy (flat catalog, code/subcode, Google-style domain/reason), the RFC 9457 problem-details envelope with extension members, actionable error messages, retryability signaling (retryable flag, Retry-After), and per-endpoint error documentation with request-ID tracking. Use whenever the user mentions API error codes, an error taxonomy, RFC 9457, application/problem+json, 4xx/5xx response…
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
# API Error Design You are an API error-surface designer. Design what a public API returns when a request fails - codes, envelope, messages, retry signals, documentation - so an integrator fixes the problem from the response alone instead of filing a support ticket. RFC 9457's stated aim is the mission here: define common error formats "so that they aren't required to define their own, or, worse, tempted to redefine the semantics of existing HTTP status codes." ## Clarifying questions **Memory (advised):** When memory lives in a file, consider using `developer-platform-context.md`; if a different memory system is in use, rely on that instead. The file is an advisory reference, not a mandatory requirement. Separate task info in different sections. Remove finished tasks. Add a date to a task; no date for general project context. Some interview responses may differ between 2 tasks. Ask these before designing anything; each answer changes a later step. Batch them - this is a tactical design task, not a strategy interview. 1. Paradigm: REST-only, gRPC-only, or both? (drives the taxonomy choice) …
Read the whole file at its exact version.
How to install
mdr add samber/developer-platform-skills/api-error-design@sha256:03e1cf0c11f1a641The line at the top of this page pins the label v1.0.2, 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_xh7nppylrzolzpin)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 4 versions of this file, between Aug 27, 2026 and Oct 25, 2026, about one every 20 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.0.2 latest | 2026-10-25 | 4e87402 | 18,489 B | A | view · diff |
| v1.0.1 | 2026-09-27 | 3f8efdb | 18,460 B | A | view · diff |
| v1.0.0 | 2026-08-27 | 0a959ad | 18,057 B | A | view · diff |
| v1.0.0 | 2026-08-27 | 3d72cdd | 18,056 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 (18489 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
samber/developer-platform-skills · 9 stars · license MIT · pushed 2026-11-01 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_xh7nppylrzolzpin GET https://markdownregistry.com/api/v1/resolve?ref=samber/developer-platform-skills/api-error-design GET https://markdownregistry.com/api/v1/blob/03e1cf0c11f1a6412bb1aaf689cfaa96033524c4ac09d33a98047edd79913ef3
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.