Attribute Macro task 

#[task]

Transforms an async function into a CoreTask implementation.

Attributes

• id = "custom_name" — override the task ID (default: function name)
• display_name = "Charge Card" — human-readable name
• description = "Charges the customer's card" — task description
• timeout = "30s" — task timeout (supports ms, s, m, h suffixes)
• retries = 3 — maximum retry count
• backoff = "100ms" — initial retry delay
• backoff_multiplier = 2.0 — exponential multiplier (default: 2.0)
• tags = "io" — categorization tags (can be repeated)

Parameters

• Exactly one non-#[inject] parameter: the task input type
• Zero or more #[inject] parameters: dependency-injected fields

Return Types

• Result<T, E> — fallible; E is converted via Into<BoxError>
• T — infallible; automatically wrapped in Ok(...)

Generated Code

• A PascalCase struct (e.g., fn charge → struct Charge)
• new() constructor with positional args for injected dependencies
• task_id() and metadata() helper methods
• register() method for TaskRegistry integration
• CoreTask trait implementation
• The original function is preserved for direct use/testing