Do you use guardrails when vibe coding with AI?

You’re in the zone: the AI is pumping out code, you’re copy-pasting at light speed, and everything *seems* to work… until a weird edge case hits production, a security scanner lights up, or your team can’t explain the “magic” function anyone merged last week.

Vibe coding is awesome—**as long as you add guardrails**.

What “vibe coding” is (and what it is not)

Vibe coding is using an LLM as a high-velocity pair programmer: drafting code, tests, docs, and refactors while you stay focused on the intent.

It is not:

• Shipping code you don’t understand
• Bypassing reviews because “the AI wrote it”
• Letting generated code set your architecture, security posture, or licensing risk

Guardrail #1: Write a micro-spec before you generate code

Treat your prompt like instructions to a junior dev. Include:

• Goal (what success looks like)
• Inputs/outputs
• Constraints (libraries to use/avoid, performance needs, style rules)
• Edge cases
• Acceptance tests (even just a few bullets)

❌ Figure: Figure: Bad Example - Vague prompt = unpredictable output (missing constraints, validation rules, and error handling expectations)

    You are a senior developer. Implement \`PUT /users/{id}\`.
    
    Requirements:
    
    * Validate: \`displayName\` (1-50 chars), \`email\` (valid format), reject unknown fields
    * Use existing \`UserService.UpdateUserAsync(id, dto)\`
    * Return: 200 with updated DTO, 400 with validation errors, 404 if not found
    * No new dependencies
    * Add unit tests for: happy path, invalid email, missing user, unknown fields

✅ Figure: Figure: Good Example - A micro-spec guides the AI toward code that fits your system and is easier to verify

Guardrail #2: Keep changes small and iterative

Avoid “generate the whole feature.” Instead:

1. Generate a thin slice (a single function, class, or endpoint)

2. Compile/run tests

3. Ask for improvements (error handling, edge cases, performance)

4. Repeat

This reduces hallucinations and makes review manageable.

Guardrail #3: You own the code—prove it with tests and explanations

Always add (or generate) tests immediately

• AI is great at drafting tests, but you still need to validate assumptions:
• Add tests **before** trusting the implementation
• Include edge cases and negative tests
• Prefer deterministic tests over “it seems fine”

Code review is non-negotiable

AI-generated code must go through the same (or higher) scrutiny as any other change:

• Peer review every meaningful chunk
• Ask the author to explain the logic during review
• If the author can’t explain it, **rewrite it**

Guardrail #4: Don’t create security or compliance debt

Keep sensitive data out of prompts

• Never paste secrets, credentials, private keys, or customer PII
• If you need context, sanitize or anonymize

Run security checks in CI

Use your normal safety net (linters, static analysis, secret scanning). Treat AI output as “untrusted input” until checked.

Watch licensing and “copy-like” code

AI can sometimes produce code that resembles open-source snippets:

• Avoid prompts like “copy the implementation of X from Y”
• Prefer “implement behavior” prompts
• If a snippet looks suspiciously polished or familiar, replace it with your own implementation or verify licensing before use

Guardrail #5: Leave breadcrumbs for maintainers

Generated code becomes technical debt when nobody knows *why* it exists.

Do this instead:

• Note AI assistance in the PR description (and link the prompt if helpful)
• Document non-obvious decisions and assumptions
• Ensure code matches your team’s patterns and standards (refactor immediately if it doesn’t)

Bonus: Give the AI your standards

Create a lightweight repo guide (e.g. `copilot-instructions.md`) with:

• Architecture overview
• Naming conventions
• Testing patterns
• Logging/exception handling rules
• Security requirements

Vibe coding checklist

Before merge, you should be able to say “yes” to all of these:

✅ I can explain the code without the AI

✅ The change is small and easy to review

✅ Tests exist and cover edge cases

✅ Security checks pass (and no secrets were shared)

✅ Licensing risk is considered for any “too-perfect” snippet

✅ Documentation/PR notes capture the intent and constraints