{"version":"2.1.285","anchor":"zod-json-schema-conversion-updated","canonical_anchor":"zod-json-schema-conversion-updated","heading":"Schema conversion library updated","tier":"internal","area":"Schemas","url":"https:\/\/changelogs.core-directive.com\/v\/2.1.285\/e\/zod-json-schema-conversion-updated","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.285","markdown":"### Schema conversion library updated\n\nThe bundled zod library was updated, changing how some tool and MCP schemas are converted to and from JSON Schema\n\n**What**\n\nClaude Code includes a library called zod to describe the shape of data, such as the inputs a tool accepts. That library was updated. Converting to JSON Schema, a standard format for describing data, now merges combined schemas, simplifies choices between plain types, and escapes references. Converting from JSON Schema now handles lists with optional items, rules on property names and fixed leading items.\n\n**Why**\n\nThe way tool and MCP server input formats are translated may change in small ways.\n\n- Area: Schemas\n- Tier: Under the hood\n- Useful: 1\/5\n- Signal: 0\/5"}