backend-error-handling SKILL.md skillA
This file is byte-identical to the first copy the registry indexed. Same content hash, so the same checks give both the same grade.
backend-error-handling from kensaurus/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add kensaurus/skills/backend-error-handling@git:20261006.39320f8Pins git:20261006.39320f8 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- kensaurus/skills
- Path
skills/backend-error-handling/SKILL.md- Versions recorded
- 5
- Latest version
- git:20261006.39320f8, committed Oct 6, 2026
- First version recorded
- Sep 12, 2026
- Size
- 8,076 bytes
- Repository stars
- 9
- License
- MIT
Implement error-handling patterns: boundaries, toasts, one API error shape. Use when "error boundary", "error toast", or "standardize API errors". Plan-only audit → plan-error-handling. Sentry triage → debug-sentry-monitor.
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
# Error Handling Skill
**Degree of freedom: MIXED.** Which layer and message `[HIGH freedom]`;
existing-type/boundary probes `[LOW freedom — run exactly]`.
## How to reason
1. **Observe** — existing error types, boundaries, `ActionResult` / `ApiError`
2. **Interpret** — missing layer vs inconsistent shape vs swallowed catch
3. **Classify** — reuse-existing / extend-codes / add-boundary / toast-only
4. **Severity** — unhandled 500 on a mutation outranks a missing toast
## Worked example
> **Observe:** `createUser` throws Prisma `P2002`; UI shows a blank catch; `ActionResult` already lives in `types/errors.ts`.
> **Interpret:** known conflict is unmapped; no field/toast path.
> **Classify:** reuse `ActionResult` + `CONFLICT`; toast the message; do not add a second error type.
> **Verify:** duplicate email returns `{ success: false, error: { code: 'CONFLICT' } }`; form alert shown.
## Self-critique before reporting
- **Reuse shape** — searched `ActionResult` / `ApiError` / `error.tsx` before adding a type
- **User-safe** — `INTERNAL_ERROR` is generic; PII is not in the client message
- **Layered** — boundary + action result + toast, not toast-only
…Read the whole file at its exact version.
How to install
mdr add kensaurus/skills/backend-error-handling@sha256:9974a852ad07317bThe line at the top of this page pins the label git:20261006.39320f8, 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_r5h7tkay6knx6vp6)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Sep 12, 2026 and Oct 6, 2026, about one every 6 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261006.39320f8 latest | 2026-10-06 | 39320f8 | 8,076 B | A | view · diff |
| git:20260923.938ff43 | 2026-09-23 | 938ff43 | 11,805 B | A | view · diff |
| git:20260923.68c095e | 2026-09-23 | 68c095e | 11,809 B | A | view · diff |
| git:20260923.cf348bd | 2026-09-23 | cf348bd | 11,827 B | A | view · diff |
| git:20260912.33d48b1 | 2026-09-12 | 33d48b1 | 11,792 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 (8076 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
kensaurus/skills · 9 stars · license MIT · pushed 2026-10-19 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_r5h7tkay6knx6vp6 GET https://markdownregistry.com/api/v1/resolve?ref=kensaurus/skills/backend-error-handling GET https://markdownregistry.com/api/v1/blob/9974a852ad07317b40ddcdfd4745de4fb51ab435b02043e95b8552e3040f6c87
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.
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