R15.8: Recoverable 404 navigation

Short answer: Not-found pages provide search and home navigation links. A dead end 404 loses the visitor.

Group: Error boundaries and fallback rendering. Status: stable. Generated from the rule definitions; do not edit by hand.

Playground: https://brevio.pro/tools/agent-guard-playground?rule=R15.8

What it catches

Recoverable 404 navigation: not-found pages provide search and home navigation links.

Why

A dead end 404 loses the visitor.

A bad example

export default () => <h1>404</h1>;

A good example

export default () => <NotFound links={['/', '/search']} />;

How it is checked

• Nothing yet. No scanner and no slice card checks it: it is a standing rule for authors and reviewers.

How to silence it

A person can silence one finding with brevio-core: ignore R15.8 -- reason on the line or the line above. Without the reason it does not count. An agent cannot silence it: the agent hook and the MCP tools never honour the comment, and a pull request that adds one is reported until a reviewer allows it. Fixing the code is still the better answer.

To change what the rule flags, edit its definition in dev_rules.py or code_rules/__init__.py. That is a code change and is reviewed like one.

Related rules

• R15.1 React error boundary protection
• R15.2 Non-blocking third-party failures
• R15.3 Form submit recovery
• R15.4 Image broken state fallback
• Every rule