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type { StandardSchemaV1, StandardJSONSchemaV1 } from '@standard-schema/spec';\nimport { toJSONSchema } from 'zod/v4';\nimport type { StandardSchemaWithJSON, StandardSchemaWithJSONProps } from '../standard-schema.types';\n\n/**\n * Supported JSON Schema targets for z.toJSONSchema().\n * Works with both real Zod v4 and Zod 3.25's v4 compat layer.\n */\nconst SUPPORTED_TARGETS = new Set(['draft-07', 'draft-04', 'draft-2020-12']);\n\n/**\n * Maps Mastra's target names to Zod v4's expected format.\n * Zod v4's z.toJSONSchema() expects \"draft-7\" instead of \"draft-07\",\n * and \"draft-4\" instead of \"draft-04\".\n */\nconst ZOD_V4_TARGET_MAP: Record = {\n 'draft-07': 'draft-7',\n 'draft-04': 'draft-4',\n};\n\n/**\n * Options for the Zod v4 adapter's JSON Schema conversion.\n */\nexport interface ZodV4AdapterOptions {\n unrepresentable?: 'any' | 'error';\n override?: (ctx: { zodSchema: unknown; jsonSchema: Record }) => undefined;\n}\n\n/**\n * Converts a Zod v4 schema to JSON Schema using 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may not implement `StandardJSONSchemaV1` (JSON Schema conversion)\n * on the `~standard` property. 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The 'zod/v3' compat export from modern zod\n *\n * We detect Zod v3 by checking:\n * - Has ~standard.vendor === 'zod' (both v3 and v4 have this)\n * - Does NOT have ~standard.jsonSchema (only Zod v4 has native JSON Schema support)\n * - Does NOT have _zod property (only Zod v4 has this)\n *\n * Note: We can't use instanceof z3.ZodType because the old 'zod-v3' package\n * has a different prototype chain than 'zod/v3'.\n */\nfunction isZodV3(schema: unknown): schema is ZodType {\n if (schema === null || typeof schema !== 'object') {\n return false;\n }\n\n // Must not be Zod v4\n if (isZodV4(schema)) {\n return false;\n }\n\n // Check for ~standard with vendor 'zod' but no jsonSchema\n if ('~standard' in schema) {\n const std = (schema as any)['~standard'];\n if (typeof std === 'object' && std !== null && std.vendor === 'zod' && !('jsonSchema' in std)) {\n return true;\n }\n }\n\n // Fallback: check instanceof for zod/v3 compat export\n return schema instanceof z3.ZodType;\n}\n\nexport function toStandardSchema(schema: PublicSchema): StandardSchemaWithJSON {\n // First check: if already StandardSchemaWithJSON, return as-is\n // This handles ArkType, Zod v4 (when it has jsonSchema), and pre-wrapped schemas\n if (isStandardSchemaWithJSON(schema)) {\n return schema;\n }\n\n // Check for Zod v4 schemas without ~standard.jsonSchema\n // This handles both real Zod v4 and Zod 3.25's v4 compat layer where\n // ~standard.jsonSchema is not present on the schema object\n if (isZodV4(schema)) {\n return toStandardSchemaZodV4(schema as any, {\n unrepresentable: JSON_SCHEMA_LIBRARY_OPTIONS.unrepresentable,\n override: JSON_SCHEMA_LIBRARY_OPTIONS.override,\n });\n }\n\n // Check for Zod v3 schemas (need wrapping to add JSON Schema support)\n // Important: Must use isZodV3() not instanceof z3.ZodType because\n // Zod v4 schemas are also instanceof z3.ZodType due to prototype compatibility\n if (isZodV3(schema)) {\n return toStandardSchemaZodV3(schema as ZodType);\n }\n\n // Check for AI SDK Schema objects (Vercel's jsonSchema wrapper)\n if (isVercelSchema(schema)) {\n return toStandardSchemaAiSdk(schema as Schema);\n }\n\n // At this point, assume it's a plain JSON Schema object\n // JSON Schema objects are plain objects with properties like 'type', 'properties', etc.\n if (schema === null || (typeof schema !== 'object' && typeof schema !== 'function')) {\n throw new Error(`Unsupported schema type: ${typeof schema}`);\n }\n\n // If it's a function that's not StandardSchemaWithJSON, it's not supported\n if (typeof schema === 'function') {\n throw new Error(`Unsupported schema type: function (schema libraries should implement StandardSchemaWithJSON)`);\n }\n\n return toStandardSchemaJsonSchema(schema as JSONSchema7);\n}\n\n/**\n * Type guard to check if a value implements the StandardSchemaV1 interface.\n *\n * @param value - The value to check\n * @returns True if the value implements StandardSchemaV1\n *\n * @example\n * ```typescript\n * import { isStandardSchema } from '@mastra/schema-compat';\n *\n * if (isStandardSchema(someValue)) {\n * const result = someValue['~standard'].validate(input);\n * }\n * ```\n */\nexport function isStandardSchema(value: unknown): value is StandardSchemaV1 {\n // Check for object or function (some libraries like ArkType use callable schemas)\n if (value === null || (typeof value !== 'object' && typeof value !== 'function')) {\n return false;\n }\n if (!('~standard' in value)) {\n return false;\n }\n const std = (value as any)['~standard'];\n return (\n typeof std === 'object' &&\n std !== null &&\n 'version' in std &&\n std.version === 1 &&\n 'vendor' in std &&\n 'validate' in std &&\n typeof std.validate === 'function'\n );\n}\n\n/**\n * Type guard to check if a value implements the StandardJSONSchemaV1 interface.\n *\n * @param value - The value to check\n * @returns True if the value implements StandardJSONSchemaV1\n *\n * @example\n * ```typescript\n * import { isStandardJSONSchema } from '@mastra/schema-compat';\n *\n * if (isStandardJSONSchema(someValue)) {\n * const jsonSchema = someValue['~standard'].jsonSchema.output({ target: 'draft-07' });\n * }\n * ```\n */\nexport function isStandardJSONSchema(value: unknown): value is StandardJSONSchemaV1 {\n // Check for object or function (some libraries like ArkType use callable schemas)\n if (value === null || (typeof value !== 'object' && typeof value !== 'function')) {\n return false;\n }\n if (!('~standard' in value)) {\n return false;\n }\n const std = (value as any)['~standard'];\n if (typeof std !== 'object' || std === null) {\n return false;\n }\n if (!('version' in std) || std.version !== 1 || !('vendor' in std)) {\n return false;\n }\n if (!('jsonSchema' in std) || typeof std.jsonSchema !== 'object') {\n return false;\n }\n return typeof std.jsonSchema.input === 'function' && typeof std.jsonSchema.output === 'function';\n}\n\n/**\n * Type guard to check if a value implements both StandardSchemaV1 and StandardJSONSchemaV1.\n *\n * @param value - The value to check\n * @returns True if the value implements both interfaces\n *\n * @example\n * ```typescript\n * import { isStandardSchemaWithJSON } from '@mastra/schema-compat';\n *\n * if (isStandardSchemaWithJSON(someValue)) {\n * // Can use both validation and JSON Schema conversion\n * const result = someValue['~standard'].validate(input);\n * const jsonSchema = someValue['~standard'].jsonSchema.output({ target: 'draft-07' });\n * }\n * ```\n */\nexport function isStandardSchemaWithJSON(value: unknown): value is StandardSchemaWithJSON {\n return isStandardSchema(value) && isStandardJSONSchema(value);\n}\n\n/**\n * Converts a StandardSchemaWithJSON to a JSON Schema.\n *\n * @param schema - The StandardSchemaWithJSON schema to convert\n * @param options - Conversion options\n * @param options.target - The JSON Schema target version (default: 'draft-07')\n * @param options.io - Whether to use input or output schema (default: 'output')\n * - 'input': Use for tool parameters, function arguments, request bodies\n * - 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