Validate Params Task

Problem

A Hanami team needs help with a task in this area:

Use when validating request parameters in Hanami 2.x Actions, including defining required/optional params blocks, applying type coercion (integer, bool, date), validating nested and array params, adding constraints, writing custom cross-field rules, and handling validation errors with 422 responses.

The team has asked for a concise implementation artifact that a reviewer can inspect without needing to observe the agent's process.

Output

Create answer.md with:

• a short plan for the work
• the concrete Hanami-oriented artifact or recommendation
• the verification steps or quality gates that should be run
• any assumptions that affect the result