web-error-handling-error-boundaries SKILL.md skillA
web-error-handling-error-boundaries from agents-inc/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add agents-inc/skills/web-error-handling-error-boundaries@git:20260906.3dc53cePins git:20260906.3dc53ce in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- agents-inc/skills
- Path
src/skills/web-error-handling-error-boundaries/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260906.3dc53ce, committed Sep 6, 2026
- First version recorded
- Feb 2, 2026
- Size
- 10,518 bytes
- Repository stars
- 26
- License
- MIT
Error boundary patterns, fallback UI, reset/retry, react-error-boundary library, React 19 createRoot error hooks.
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
# React Error Boundaries > **Quick Guide:** A boundary catches errors thrown during render, in lifecycle methods and in constructors, and swaps the subtree for fallback UI. It never sees event-handler, async or server-render errors — those reach it only when something calls `showBoundary()`. Boundaries are class components, because `getDerivedStateFromError` and `componentDidCatch` have no hook equivalent. React 19 adds `onCaughtError`, `onUncaughtError` and `onRecoverableError` on `createRoot`, which log rather than render and are silently ignored on React 18. **Detailed Resources:** - [examples/core.md](examples/core.md) — the class boundary, `react-error-boundary` usage, `resetKeys`, `useErrorBoundary`, granular placement - [examples/react-19-hooks.md](examples/react-19-hooks.md) — `createRoot`/`hydrateRoot` error options, `captureOwnerStack()`, error filtering - [examples/recovery.md](examples/recovery.md) — retry limits, exponential backoff, error classification - [examples/testing.md](examples/testing.md) — what makes a boundary testable, and the fixtures that do it - [reference.md](reference.md) — what boundaries catch, lifecycle and prop tables, checklists --- …
Read the whole file at its exact version.
How to install
mdr add agents-inc/skills/web-error-handling-error-boundaries@sha256:19fc997dca73c311The line at the top of this page pins the label git:20260906.3dc53ce, 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_i6pjszbhbvettart)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Feb 2, 2026 and Sep 6, 2026, about one every 108 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260906.3dc53ce latest | 2026-09-06 | 3dc53ce | 10,518 B | A | view · diff |
| git:20260316.00cb75b | 2026-03-16 | 00cb75b | 16,013 B | A | view · diff |
| git:20260202.b236384 | 2026-02-02 | b236384 | 19,696 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 (10518 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
agents-inc/skills · 26 stars · license MIT · pushed 2026-10-27 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_i6pjszbhbvettart GET https://markdownregistry.com/api/v1/resolve?ref=agents-inc/skills/web-error-handling-error-boundaries GET https://markdownregistry.com/api/v1/blob/19fc997dca73c311c49fbcec2eaf463544fc8341502806ecf1ee4e2c1b6f3762
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.