/phx-quick

name: phx-quick
description: Implement small Phoenix changes without planning — add validations, update
  routes, fix components, create migrations. Use for single-file edits under 50 lines.

Quick Mode

Skip the planning ceremony. Get working code fast.

Usage

phx-quick Add pagination to posts
phx-quick Fix the login redirect bug
phx-quick Add CSV export to reports

Arguments

`$ARGUMENTS` = What to implement

How It Differs

| Normal Mode | Quick Mode | |-------------|------------| | Spawn research agents | No agents | | Create plan document | Mental model only | | Parallel review | Optional single review | | Multiple iterations | Single pass |

Workflow

1. **Understand** - Read the files the change touches 2. **Implement** - Write code directly 3. **Verify** - Quick compile check 4. **Done** - No ceremony

Iron Laws

1. **NEVER skip verification** — run `mix compile --warnings-as-errors` after every change, even in quick mode 2. **DO NOT touch files outside the stated scope** — quick mode means minimal blast radius; if a fix requires changes across multiple domains, escalate to `phx-plan` 3. **NEVER bypass security checks for speed** — auth, input validation, and XSS rules apply regardless of change size

Rules in Quick Mode

Still Enforced (Iron Laws)

• ✓ No process without runtime reason
• ✓ No DB in mount
• ✓ Security basics (no SQL injection, etc.)
• ✓ Run `mix format`

Skipped

• ✗ Parallel agent research
• ✗ Written plan document
• ✗ Multiple review passes
• ✗ Documentation updates

When to Use

**Good for:**

• Bug fixes with clear solution
• Small features (<100 lines)
• Refactoring with tests
• Adding fields/columns
• UI tweaks

**Not for:**

• New authentication flows
• Payment integration
• Data migrations
• Architectural changes
• Anything touching security

Quick Patterns

Add Field

/quick Add phone field to users

→ Migration + schema + changeset + form field

Fix Bug

/quick Fix: posts not showing for admin users

→ Find issue + fix + verify

Add Endpoint

/quick Add GET /api/health endpoint

→ Route + controller + response

Escape Hatch

If quick mode hits complexity:

This needs more planning. Switching to normal mode.
Run phx-plan [task] for full analysis.

Verification

After quick implementation:

Run `mix compile --warnings-as-errors`. If you touched Ecto schemas or migrations, run `mix ecto.migrate`. Then run `mix test test/path_test.exs` for affected tests.

Example Session

User: phx-quick Add archived_at timestamp to posts

Claude:
1. Reading lib/my_app/blog/post.ex...
2. Creating migration...

# priv/repo/migrations/xxx_add_archived_at_to_posts.exs
def change do
  alter table(:posts) do
    add :archived_at, :utc_datetime
  end
end

3. Updating schema...

# lib/my_app/blog/post.ex
field :archived_at, :utc_datetime

4. Adding to changeset...

def changeset(post, attrs) do
  post
  |> cast(attrs, [:title, :body, :archived_at])
  ...
end

5. Verifying...
$ mix compile --warnings-as-errors ✓
$ mix ecto.migrate ✓
$ mix test test/my_app/accounts_test.exs ✓

Done.