Imported from aviralj02/interface-skills (skills/user-flows/SKILL.md). Install upstream with npx skills add aviralj02/interface-skills --skill user-flows. Copyright stays with the author.

User Flows

Purpose

Screens are designed one at a time; users experience them as a sequence that can be entered from anywhere, interrupted at any moment, and resumed days later. This skill designs the sequence — including every branch the happy-path mockup leaves out.

When to Use

• A feature has more than one step, screen, or modal
• Users can arrive at a step from somewhere other than step one (email link, notification, bookmark, shared URL)
• A process takes long enough that users might leave and come back
• Support reports "I got stuck", "I lost my progress", "I don't know if it worked"

Core Principles

1. Start from the goal, end at the outcome. A flow ends when the user's goal is met and they know it — not when the last form submits.
2. Every step has an exit and a back. Users must be able to leave without penalty and return without starting over, unless there is a stated reason not to.
3. Every decision point has all its branches drawn. If a step can fail, the failure is a branch with a destination, not a footnote.
4. Interruption is the normal case. Refresh, back button, closed tab, expired session, lost network, and switching devices will happen.
5. The URL is part of the flow. Steps that users may share, bookmark, or return to need addresses; steps that must not be re-entered need guards.
6. Returning users are a different user. Someone resuming a flow needs orientation, not step one.

Workflow

1. Define the goal and the actors

• Goal: what the user is trying to achieve, in their words
• Outcome: the observable end state (account exists, file processed, teammate joined)
• Actors: everyone involved — e.g. an invite flow has an inviter and an invitee, each with their own flow

2. List entry points

For each: where does it land, what context does it carry, and what if the user is not signed in, lacks permission, or the target no longer exists?

3. Map steps and decision points

Draw the flow. Use text or Mermaid — whichever the team can maintain.

Import contacts
    ↓
Choose source ── [CSV] ── Upload file
    │                        ↓
    │                    Validate file
    │                      ├── Unreadable → error: "Not a valid CSV" → Upload file
    │                      ├── Too large  → error with limit → Upload file
    │                      └── Valid
    │                            ↓
    └── [Google] ── OAuth ──┬── Denied → explain what's needed → Choose source
                            └── Granted
                                  ↓
                            Map columns ── (auto-mapped ≥ 90%?) ── skip to Review
                                  ↓
                               Review (show conflicts: 12 duplicates)
                                  ├── Cancel → confirm discard → Contacts list
                                  └── Import
                                        ↓
                                   Processing (background, can leave)
                                     ├── Partial: 480 imported, 20 failed → download error rows
                                     ├── Failed → reason + retry (no duplicates)
                                     └── Complete → Contacts list, filtered to new

For every decision point, confirm each branch has a destination and a way forward.

4. Write the step table

5. Design interruptions

For each step, decide what happens on:

6. Design the return

• Resume: where does a returning user land? Show progress ("Step 3 of 4 — mapping columns") and what was already done.
• Abandoned drafts: how long are they kept, where can users find them, how are they discarded?
• Completed flows: a second visit to a finished flow's URL should show the result, not restart it.

7. Define exit points

• Success exit: where the user lands, what confirms success, the obvious next action
• Cancel exit: what is discarded, whether it is confirmed, where the user lands
• Failure exit: what the user can do now (retry, contact support, save and exit)

Checklist

• Goal and observable outcome written
• Every entry point listed with signed-out and invalid-target handling
• Every decision point has all branches drawn to a destination
• Every failure branch has a way forward
• Back works on every step that allows it, with input intact
• Refresh, session expiry, and closed tab are designed per step
• Steps that should be linkable have URLs; steps that should not be re-entered are guarded
• Anything that expires is communicated before it expires
• Returning users land with orientation, not at step one
• Success, cancel, and failure exits all have destinations
• Multi-actor flows have a flow per actor

Common Mistakes

• The flow ends at "Submit". No confirmation screen, no destination, no next step.
• Wizard state in memory only. Refresh at step 4 of 5 restarts from step 1.
• Deep links that assume a fresh session, dropping the token or target after sign-in.
• Validation only on the final step, sending the user back through three screens to fix one field.
• Cancel with no confirmation after significant input, or confirmation for cancelling an empty form.
• Background jobs that disappear when the user navigates away, with no place to find the result.
• Invitee flow never designed because the inviter's flow was the ticket.

Example

Flow: accept a team invitation (invitee side)

Email "Join Acme on Product"
    ↓ click link (token)
Has account?
 ├── No → Sign up (email prefilled, locked) → verify email → [Join]
 └── Yes → Signed in?
            ├── No → Sign in → return with token
            └── Yes, but different email → "This invite is for jo@acme.com" → switch account / request new invite
                ↓
Token valid?
 ├── Expired → "Invite expired" → [Ask Sam to resend] (notifies inviter)
 ├── Revoked → "This invitation is no longer active" → go to your workspaces
 ├── Already accepted → go straight to workspace
 └── Valid → Join → workspace home with "Welcome to Acme" and 3 getting-started links

Interruptions: if the invitee closes the tab during sign-up, the link still works (token not consumed until join). If the seat limit was reached after sending, show "Acme has no free seats" and notify the inviter.

Implementation Notes

• Encode step in the URL (/import/:id/map) when steps must survive refresh or be shared; guard steps whose prerequisites are missing and redirect to the earliest incomplete one.
• Preserve the intended destination through authentication (?next= or server-side stash), validating it to avoid open redirects.
• Server drafts for high-effort input; local storage for low-stakes forms; nothing for trivial ones.
• Make final submission idempotent so a retried or double-clicked submit cannot create two results.
• Use user-flows output as input to interface-states (per step) and async-interactions (per submit).

Output Expectations

Produce:

1. Goal, outcome, actors.
2. Entry point table.
3. Flow diagram (text or Mermaid) with all branches.
4. Step table — intent, input, back, persistence, URL, failure branches.
5. Interruption table — per step or per class of step.
6. Return and exit design.
7. Open questions — decisions that need a product owner (retention period for drafts, whether cancel needs confirmation, token expiry).