cursor-plugin-convex-rule-argument-validation

name	cursor-plugin-convex-rule-argument-validation
description	All public functions must validate arguments and return types
metadata	{"version":"0.1.0"}

Argument Validation

All public query, mutation, and action functions MUST define validators for both arguments and return types. This protects against malicious input and provides type safety.

Pattern

Always use the args and returns fields:

export const createTask = mutation({
  args: {
    text: v.string(),
    userId: v.id("users"),
    priority: v.optional(v.union(
      v.literal("low"),
      v.literal("medium"),
      v.literal("high")
    )),
  },
  returns: v.id("tasks"),
  handler:  (ctx, args) => {
      ctx..(, {
      : args.,
      : args.,
      : args. ?? ,
      : ,
    });
  },
});