1  /**
 2   * Converts Zod v4 schemas to JSON Schema using native toJSONSchema.
 3   */
 4  
 5  import { toJSONSchema, type ZodTypeAny } from 'zod/v4'
 6  
 7  export type JsonSchema7Type = Record<string, unknown>
 8  
 9  // toolToAPISchema() runs this for every tool on every API request (~60-250
10  // times/turn). Tool schemas are wrapped with lazySchema() which guarantees the
11  // same ZodTypeAny reference per session, so we can cache by identity.
12  const cache = new WeakMap<ZodTypeAny, JsonSchema7Type>()
13  
14  /**
15   * Converts a Zod v4 schema to JSON Schema format.
16   */
17  export function zodToJsonSchema(schema: ZodTypeAny): JsonSchema7Type {
18    const hit = cache.get(schema)
19    if (hit) return hit
20    const result = toJSONSchema(schema) as JsonSchema7Type
21    cache.set(schema, result)
22    return result
23  }