Password Generator
Offer a strong password in one click wherever someone sets or changes credentials.
What it adds
A generate control on password fields that produces a strong value, shows it, and hands it to the user safely.
What your agent is told to do
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What your agent is told to do
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Add the control to every place a password is set: sign-up, password change, password reset completion, and any admin screen that provisions credentials for someone else.
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Generate the value in the browser using the platform's cryptographic random source. The value must never be produced on the server or sent anywhere.
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Reveal the generated password by default so the user can record it, and offer a regenerate control beside it. A hidden generated password that the user cannot see is a password they will immediately reset.
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Feed the generated value straight into the app's existing Password Strength Meter and validation rather than adding a second, parallel indicator. If the generator produces something the app's own policy rejects, the policy and the generator are out of step and the generator is wrong.
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Do not use the language's ordinary random number helper. It is seeded predictably, and a password generated from it is guessable given enough samples.
Edge cases it handles
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Edge cases it handles
8- Use a cryptographically secure random source. A general-purpose pseudorandom helper produces sequences an attacker can reproduce, which quietly makes every password it generated weak.
- If the password policy requires an uppercase letter, a digit, or a symbol, the generator must guarantee each required class appears rather than hoping random selection covers them. Place the guaranteed characters at random positions, not at the start.
- Offer a mode that excludes look-alike characters such as capital I, lowercase l, digit one, capital O, and zero, for passwords that will be read aloud or typed from a screen.
- The generated value must never be logged, sent in analytics, included in an error report, or persisted anywhere but the user's own password field. Check that form autofill and error-tracking tooling are not capturing it.
- Do not leave the value on screen or in the clipboard indefinitely. Re-mask it once the form is submitted, and tell the user the clipboard still holds it rather than pretending it was cleared.
- Some password managers replace the field value after the user has generated one. Detect the change and do not overwrite the manager's value with a stale generated string.
- Length matters more than symbol variety. Default to a generous length rather than a short password stuffed with punctuation, and let the user increase it.
- Symbols the target system rejects, or that break when pasted into a terminal or a connection string, must be excludable without regenerating from scratch.
Definition of done
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Definition of done
9- Every credential-setting screen offers one-click generation.
- Generation uses the platform's cryptographic random source, verified by inspection of the code path.
- Every character class the password policy requires is present in every generated value.
- A look-alike-free mode is available for passwords that will be typed or spoken.
- The generated value never appears in logs, analytics, or error reports.
- The generated value is shown to the user and re-masked after submission, with an honest note about the clipboard.
- Generated passwords always pass the app's own validation and strength meter.
- The feature matches the existing design system.
- No existing functionality is broken.
Related features
Upload Malware Scanning
Upload Malware Scanning
Quarantine uploaded files until they are known safe.
What it does
A quarantine lifecycle for uploads: every new file is unreachable until scanned, with defined handling for scanner failures and infected results.
How it works
- 1 Give every upload an explicit scan state — pending, clean, infected, or error — and default it to pending the moment the bytes land.
- 2 Make pending and infected files unreachable from every access path in the app, including admin views, previews, thumbnails, and any signed URL. A quarantine with one exception is not a quarantine.
- 3 Scan asynchronously and update the state; do not block the upload request on the scanner.
Copy the prompt
No account needed
Add this feature to my app:
https://addthisfeature.com/x/upload-malware-scanning
Rate Limiting
Rate Limiting
Stop one client from ruining it for everyone.
What it does
Throttling on the endpoints that get abused: auth, search, exports, and public forms.
How it works
- 1 Identify the endpoints worth protecting: sign-in, sign-up, password reset, search, exports, and anything unauthenticated.
- 2 Limit by a stable identifier — user ID where signed in, IP otherwise. Be aware IP is shared behind NAT and proxies.
- 3 Return 429 with a Retry-After header. Do not silently drop the request.
Copy the prompt
No account needed
Add this feature to my app:
https://addthisfeature.com/x/rate-limiting
Passkeys
Passkeys
Sign in with device biometrics instead of a password or a code.
What it does
WebAuthn credentials registered per device, listed and named by the user, with a defined fallback for browsers and devices that cannot use them.
How it works
- 1 Let a user register several passkeys and name each one. One passkey on one phone is a lockout waiting to happen.
- 2 Detect support before offering it, and keep the existing sign-in methods visible. Never make a passkey the only credential on an account.
- 3 Verify the assertion on the server — challenge, origin, and signature counter. A client that says authentication succeeded is not evidence.
Copy the prompt
No account needed
Add this feature to my app:
https://addthisfeature.com/x/passkeys
How it works
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Copy the link
Grab the Markdown instruction URL for this feature.
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Give it to your AI
Paste it into Claude Code, Cursor, v0, Lovable — whatever you build with.
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It inspects, then implements
Your agent reads your existing app first, then adds the feature to fit it.
Works with your stack
These instructions are written to adapt. They tell the agent to detect your framework, match your existing design system, and reuse what you already have — rather than assuming a particular stack.
Need it tighter than that? Customize the feature and tell it exactly what you're running.