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Adding .agent support in addition to .claude

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qdust41
2026-04-01 11:29:13 -04:00
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AGENTS.md
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@@ -45,329 +45,137 @@ custom classes must fully style the input
<!-- usage-rules-start -->
<!-- usage_rules-start -->
## usage_rules usage
_A config-driven dev tool for Elixir projects to manage AGENTS.md files and agent skills from dependencies_
<!-- phoenix:elixir-start -->
## Elixir guidelines
## Using Usage Rules
- Elixir lists **do not support index based access via the access syntax**
Many packages have usage rules, which you should *thoroughly* consult before taking any
action. These usage rules contain guidelines and rules *directly from the package authors*.
They are your best source of knowledge for making decisions.
**Never do this (invalid)**:
## Modules & functions in the current app and dependencies
i = 0
mylist = ["blue", "green"]
mylist[i]
When looking for docs for modules & functions that are dependencies of the current project,
or for Elixir itself, use `mix usage_rules.docs`
Instead, **always** use `Enum.at`, pattern matching, or `List` for index based list access, ie:
```
# Search a whole module
mix usage_rules.docs Enum
i = 0
mylist = ["blue", "green"]
Enum.at(mylist, i)
# Search a specific function
mix usage_rules.docs Enum.zip
- Elixir variables are immutable, but can be rebound, so for block expressions like `if`, `case`, `cond`, etc
you *must* bind the result of the expression to a variable if you want to use it and you CANNOT rebind the result inside the expression, ie:
# Search a specific function & arity
mix usage_rules.docs Enum.zip/1
```
# INVALID: we are rebinding inside the `if` and the result never gets assigned
if connected?(socket) do
socket = assign(socket, :val, val)
end
# VALID: we rebind the result of the `if` to a new variable
socket =
if connected?(socket) do
assign(socket, :val, val)
end
## Searching Documentation
- **Never** nest multiple modules in the same file as it can cause cyclic dependencies and compilation errors
- **Never** use map access syntax (`changeset[:field]`) on structs as they do not implement the Access behaviour by default. For regular structs, you **must** access the fields directly, such as `my_struct.field` or use higher level APIs that are available on the struct if they exist, `Ecto.Changeset.get_field/2` for changesets
- Elixir's standard library has everything necessary for date and time manipulation. Familiarize yourself with the common `Time`, `Date`, `DateTime`, and `Calendar` interfaces by accessing their documentation as necessary. **Never** install additional dependencies unless asked or for date/time parsing (which you can use the `date_time_parser` package)
You should also consult the documentation of any tools you are using, early and often. The best
way to accomplish this is to use the `usage_rules.search_docs` mix task. Once you have
found what you are looking for, use the links in the search results to get more detail. For example:
```
# Search docs for all packages in the current application, including Elixir
mix usage_rules.search_docs Enum.zip
# Search docs for specific packages
mix usage_rules.search_docs Req.get -p req
# Search docs for multi-word queries
mix usage_rules.search_docs "making requests" -p req
# Search only in titles (useful for finding specific functions/modules)
mix usage_rules.search_docs "Enum.zip" --query-by title
```
<!-- usage_rules-end -->
<!-- usage_rules:elixir-start -->
## usage_rules:elixir usage
# Elixir Core Usage Rules
## Pattern Matching
- Use pattern matching over conditional logic when possible
- Prefer to match on function heads instead of using `if`/`else` or `case` in function bodies
- `%{}` matches ANY map, not just empty maps. Use `map_size(map) == 0` guard to check for truly empty maps
## Error Handling
- Use `{:ok, result}` and `{:error, reason}` tuples for operations that can fail
- Avoid raising exceptions for control flow
- Use `with` for chaining operations that return `{:ok, _}` or `{:error, _}`
## Common Mistakes to Avoid
- Elixir has no `return` statement, nor early returns. The last expression in a block is always returned.
- Don't use `Enum` functions on large collections when `Stream` is more appropriate
- Avoid nested `case` statements - refactor to a single `case`, `with` or separate functions
- Don't use `String.to_atom/1` on user input (memory leak risk)
- Predicate function names should not start with `is_` and should end in a question mark. Names like `is_thing` should be reserved for guards
- Elixir's builtin OTP primitives like `DynamicSupervisor` and `Registry`, require names in the child spec, such as `{DynamicSupervisor, name: MyApp.MyDynamicSup}`, then you can use `DynamicSupervisor.start_child(MyApp.MyDynamicSup, child_spec)`
- Use `Task.async_stream(collection, callback, options)` for concurrent enumeration with back-pressure. The majority of times you will want to pass `timeout: :infinity` as option
## Mix guidelines
- Read the docs and options before using tasks (by using `mix help task_name`)
- To debug test failures, run tests in a specific file with `mix test test/my_test.exs` or run all previously failed tests with `mix test --failed`
- `mix deps.clean --all` is **almost never needed**. **Avoid** using it unless you have good reason
## Test guidelines
- **Always use `start_supervised!/1`** to start processes in tests as it guarantees cleanup between tests
- **Avoid** `Process.sleep/1` and `Process.alive?/1` in tests
- Instead of sleeping to wait for a process to finish, **always** use `Process.monitor/1` and assert on the DOWN message:
ref = Process.monitor(pid)
assert_receive {:DOWN, ^ref, :process, ^pid, :normal}
- Instead of sleeping to synchronize before the next call, **always** use `_ = :sys.get_state/1` to ensure the process has handled prior messages
<!-- phoenix:elixir-end -->
<!-- phoenix:phoenix-start -->
## Phoenix guidelines
- Remember Phoenix router `scope` blocks include an optional alias which is prefixed for all routes within the scope. **Always** be mindful of this when creating routes within a scope to avoid duplicate module prefixes.
- You **never** need to create your own `alias` for route definitions! The `scope` provides the alias, ie:
scope "/admin", AppWeb.Admin do
pipe_through :browser
live "/users", UserLive, :index
end
the UserLive route would point to the `AppWeb.Admin.UserLive` module
- `Phoenix.View` no longer is needed or included with Phoenix, don't use it
<!-- phoenix:phoenix-end -->
<!-- phoenix:html-start -->
## Phoenix HTML guidelines
- Phoenix templates **always** use `~H` or .html.heex files (known as HEEx), **never** use `~E`
- **Always** use the imported `Phoenix.Component.form/1` and `Phoenix.Component.inputs_for/1` function to build forms. **Never** use `Phoenix.HTML.form_for` or `Phoenix.HTML.inputs_for` as they are outdated
- When building forms **always** use the already imported `Phoenix.Component.to_form/2` (`assign(socket, form: to_form(...))` and `<.form for={@form} id="msg-form">`), then access those forms in the template via `@form[:field]`
- **Always** add unique DOM IDs to key elements (like forms, buttons, etc) when writing templates, these IDs can later be used in tests (`<.form for={@form} id="product-form">`)
- For "app wide" template imports, you can import/alias into the `my_app_web.ex`'s `html_helpers` block, so they will be available to all LiveViews, LiveComponent's, and all modules that do `use MyAppWeb, :html` (replace "my_app" by the actual app name)
- Elixir supports `if/else` but **does NOT support `if/else if` or `if/elsif`**. **Never use `else if` or `elseif` in Elixir**, **always** use `cond` or `case` for multiple conditionals.
**Never do this (invalid)**:
<%= if condition do %>
...
<% else if other_condition %>
...
<% end %>
Instead **always** do this:
<%= cond do %>
<% condition -> %>
...
<% condition2 -> %>
...
<% true -> %>
...
<% end %>
- HEEx require special tag annotation if you want to insert literal curly's like `{` or `}`. If you want to show a textual code snippet on the page in a `<pre>` or `<code>` block you *must* annotate the parent tag with `phx-no-curly-interpolation`:
<code phx-no-curly-interpolation>
let obj = {key: "val"}
</code>
Within `phx-no-curly-interpolation` annotated tags, you can use `{` and `}` without escaping them, and dynamic Elixir expressions can still be used with `<%= ... %>` syntax
- HEEx class attrs support lists, but you must **always** use list `[...]` syntax. You can use the class list syntax to conditionally add classes, **always do this for multiple class values**:
<a class={[
"px-2 text-white",
@some_flag && "py-5",
if(@other_condition, do: "border-red-500", else: "border-blue-100"),
...
]}>Text</a>
and **always** wrap `if`'s inside `{...}` expressions with parens, like done above (`if(@other_condition, do: "...", else: "...")`)
and **never** do this, since it's invalid (note the missing `[` and `]`):
<a class={
"px-2 text-white",
@some_flag && "py-5"
}> ...
=> Raises compile syntax error on invalid HEEx attr syntax
- **Never** use `<% Enum.each %>` or non-for comprehensions for generating template content, instead **always** use `<%= for item <- @collection do %>`
- HEEx HTML comments use `<%!-- comment --%>`. **Always** use the HEEx HTML comment syntax for template comments (`<%!-- comment --%>`)
- HEEx allows interpolation via `{...}` and `<%= ... %>`, but the `<%= %>` **only** works within tag bodies. **Always** use the `{...}` syntax for interpolation within tag attributes, and for interpolation of values within tag bodies. **Always** interpolate block constructs (if, cond, case, for) within tag bodies using `<%= ... %>`.
**Always** do this:
<div id={@id}>
{@my_assign}
<%= if @some_block_condition do %>
{@another_assign}
<% end %>
</div>
and **Never** do this – the program will terminate with a syntax error:
<%!-- THIS IS INVALID NEVER EVER DO THIS --%>
<div id="<%= @invalid_interpolation %>">
{if @invalid_block_construct do}
{end}
</div>
<!-- phoenix:html-end -->
<!-- phoenix:liveview-start -->
## Phoenix LiveView guidelines
- **Never** use the deprecated `live_redirect` and `live_patch` functions, instead **always** use the `<.link navigate={href}>` and `<.link patch={href}>` in templates, and `push_navigate` and `push_patch` functions LiveViews
- **Avoid LiveComponent's** unless you have a strong, specific need for them
- LiveViews should be named like `AppWeb.WeatherLive`, with a `Live` suffix. When you go to add LiveView routes to the router, the default `:browser` scope is **already aliased** with the `AppWeb` module, so you can just do `live "/weather", WeatherLive`
### LiveView streams
- **Always** use LiveView streams for collections for assigning regular lists to avoid memory ballooning and runtime termination with the following operations:
- basic append of N items - `stream(socket, :messages, [new_msg])`
- resetting stream with new items - `stream(socket, :messages, [new_msg], reset: true)` (e.g. for filtering items)
- prepend to stream - `stream(socket, :messages, [new_msg], at: -1)`
- deleting items - `stream_delete(socket, :messages, msg)`
- When using the `stream/3` interfaces in the LiveView, the LiveView template must 1) always set `phx-update="stream"` on the parent element, with a DOM id on the parent element like `id="messages"` and 2) consume the `@streams.stream_name` collection and use the id as the DOM id for each child. For a call like `stream(socket, :messages, [new_msg])` in the LiveView, the template would be:
<div id="messages" phx-update="stream">
<div :for={{id, msg} <- @streams.messages} id={id}>
{msg.text}
</div>
</div>
- LiveView streams are *not* enumerable, so you cannot use `Enum.filter/2` or `Enum.reject/2` on them. Instead, if you want to filter, prune, or refresh a list of items on the UI, you **must refetch the data and re-stream the entire stream collection, passing reset: true**:
def handle_event("filter", %{"filter" => filter}, socket) do
# re-fetch the messages based on the filter
messages = list_messages(filter)
{:noreply,
socket
|> assign(:messages_empty?, messages == [])
# reset the stream with the new messages
|> stream(:messages, messages, reset: true)}
end
- LiveView streams *do not support counting or empty states*. If you need to display a count, you must track it using a separate assign. For empty states, you can use Tailwind classes:
<div id="tasks" phx-update="stream">
<div class="hidden only:block">No tasks yet</div>
<div :for={{id, task} <- @streams.tasks} id={id}>
{task.name}
</div>
</div>
The above only works if the empty state is the only HTML block alongside the stream for-comprehension.
- When updating an assign that should change content inside any streamed item(s), you MUST re-stream the items
along with the updated assign:
def handle_event("edit_message", %{"message_id" => message_id}, socket) do
message = Chat.get_message!(message_id)
edit_form = to_form(Chat.change_message(message, %{content: message.content}))
# re-insert message so @editing_message_id toggle logic takes effect for that stream item
{:noreply,
socket
|> stream_insert(:messages, message)
|> assign(:editing_message_id, String.to_integer(message_id))
|> assign(:edit_form, edit_form)}
end
And in the template:
<div id="messages" phx-update="stream">
<div :for={{id, message} <- @streams.messages} id={id} class="flex group">
{message.username}
<%= if @editing_message_id == message.id do %>
<%!-- Edit mode --%>
<.form for={@edit_form} id="edit-form-#{message.id}" phx-submit="save_edit">
...
</.form>
<% end %>
</div>
</div>
- **Never** use the deprecated `phx-update="append"` or `phx-update="prepend"` for collections
### LiveView JavaScript interop
- Remember anytime you use `phx-hook="MyHook"` and that JS hook manages its own DOM, you **must** also set the `phx-update="ignore"` attribute
- **Always** provide an unique DOM id alongside `phx-hook` otherwise a compiler error will be raised
LiveView hooks come in two flavors, 1) colocated js hooks for "inline" scripts defined inside HEEx,
and 2) external `phx-hook` annotations where JavaScript object literals are defined and passed to the `LiveSocket` constructor.
#### Inline colocated js hooks
**Never** write raw embedded `<script>` tags in heex as they are incompatible with LiveView.
Instead, **always use a colocated js hook script tag (`:type={Phoenix.LiveView.ColocatedHook}`)
when writing scripts inside the template**:
<input type="text" name="user[phone_number]" id="user-phone-number" phx-hook=".PhoneNumber" />
<script :type={Phoenix.LiveView.ColocatedHook} name=".PhoneNumber">
export default {
mounted() {
this.el.addEventListener("input", e => {
let match = this.el.value.replace(/\D/g, "").match(/^(\d{3})(\d{3})(\d{4})$/)
if(match) {
this.el.value = `${match[1]}-${match[2]}-${match[3]}`
}
})
}
}
</script>
- colocated hooks are automatically integrated into the app.js bundle
- colocated hooks names **MUST ALWAYS** start with a `.` prefix, i.e. `.PhoneNumber`
#### External phx-hook
External JS hooks (`<div id="myhook" phx-hook="MyHook">`) must be placed in `assets/js/` and passed to the
LiveSocket constructor:
const MyHook = {
mounted() { ... }
}
let liveSocket = new LiveSocket("/live", Socket, {
hooks: { MyHook }
});
#### Pushing events between client and server
Use LiveView's `push_event/3` when you need to push events/data to the client for a phx-hook to handle.
**Always** return or rebind the socket on `push_event/3` when pushing events:
# re-bind socket so we maintain event state to be pushed
socket = push_event(socket, "my_event", %{...})
# or return the modified socket directly:
def handle_event("some_event", _, socket) do
{:noreply, push_event(socket, "my_event", %{...})}
end
Pushed events can then be picked up in a JS hook with `this.handleEvent`:
mounted() {
this.handleEvent("my_event", data => console.log("from server:", data));
}
Clients can also push an event to the server and receive a reply with `this.pushEvent`:
mounted() {
this.el.addEventListener("click", e => {
this.pushEvent("my_event", { one: 1 }, reply => console.log("got reply from server:", reply));
})
}
Where the server handled it via:
def handle_event("my_event", %{"one" => 1}, socket) do
{:reply, %{two: 2}, socket}
end
### LiveView tests
- `Phoenix.LiveViewTest` module and `LazyHTML` (included) for making your assertions
- Form tests are driven by `Phoenix.LiveViewTest`'s `render_submit/2` and `render_change/2` functions
- Come up with a step-by-step test plan that splits major test cases into small, isolated files. You may start with simpler tests that verify content exists, gradually add interaction tests
- **Always reference the key element IDs you added in the LiveView templates in your tests** for `Phoenix.LiveViewTest` functions like `element/2`, `has_element/2`, selectors, etc
- **Never** tests again raw HTML, **always** use `element/2`, `has_element/2`, and similar: `assert has_element?(view, "#my-form")`
- Instead of relying on testing text content, which can change, favor testing for the presence of key elements
- Focus on testing outcomes rather than implementation details
- Be aware that `Phoenix.Component` functions like `<.form>` might produce different HTML than expected. Test against the output HTML structure, not your mental model of what you expect it to be
- When facing test failures with element selectors, add debug statements to print the actual HTML, but use `LazyHTML` selectors to limit the output, ie:
html = render(view)
document = LazyHTML.from_fragment(html)
matches = LazyHTML.filter(document, "your-complex-selector")
IO.inspect(matches, label: "Matches")
- Lists and enumerables cannot be indexed with brackets. Use pattern matching or `Enum` functions
- Prefer `Enum` functions like `Enum.reduce` over recursion
- When recursion is necessary, prefer to use pattern matching in function heads for base case detection
- Using the process dictionary is typically a sign of unidiomatic code
- Only use macros if explicitly requested
- There are many useful standard library functions, prefer to use them where possible
## Function Design
- Use guard clauses: `when is_binary(name) and byte_size(name) > 0`
- Prefer multiple function clauses over complex conditional logic
- Name functions descriptively: `calculate_total_price/2` not `calc/2`
- Predicate function names should not start with `is` and should end in a question mark.
- Names like `is_thing` should be reserved for guards
## Data Structures
- Use structs over maps when the shape is known: `defstruct [:name, :age]`
- Prefer keyword lists for options: `[timeout: 5000, retries: 3]`
- Use maps for dynamic key-value data
- Prefer to prepend to lists `[new | list]` not `list ++ [new]`
## Mix Tasks
- Use `mix help` to list available mix tasks
- Use `mix help task_name` to get docs for an individual task
- Read the docs and options fully before using tasks
## Testing
- Run tests in a specific file with `mix test test/my_test.exs` and a specific test with the line number `mix test path/to/test.exs:123`
- Limit the number of failed tests with `mix test --max-failures n`
- Use `@tag` to tag specific tests, and `mix test --only tag` to run only those tests
- Use `assert_raise` for testing expected exceptions: `assert_raise ArgumentError, fn -> invalid_function() end`
- Use `mix help test` to for full documentation on running tests
## Debugging
- Use `dbg/1` to print values while debugging. This will display the formatted value and other relevant information in the console.
<!-- usage_rules:elixir-end -->
<!-- usage_rules:otp-start -->
## usage_rules:otp usage
# OTP Usage Rules
## GenServer Best Practices
- Keep state simple and serializable
- Handle all expected messages explicitly
- Use `handle_continue/2` for post-init work
- Implement proper cleanup in `terminate/2` when necessary
## Process Communication
- Use `GenServer.call/3` for synchronous requests expecting replies
- Use `GenServer.cast/2` for fire-and-forget messages.
- When in doubt, use `call` over `cast`, to ensure back-pressure
- Set appropriate timeouts for `call/3` operations
## Fault Tolerance
- Set up processes such that they can handle crashing and being restarted by supervisors
- Use `:max_restarts` and `:max_seconds` to prevent restart loops
## Task and Async
- Use `Task.Supervisor` for better fault tolerance
- Handle task failures with `Task.yield/2` or `Task.shutdown/2`
- Set appropriate task timeouts
- Use `Task.async_stream/3` for concurrent enumeration with back-pressure
<!-- usage_rules:otp-end -->
<!-- usage-rules-end -->