> ## Documentation Index > Fetch the complete documentation index at: https://docs.cognigy.com/llms.txt > Use this file to discover all available pages before exploring further. # Regenerate a specific field of a persona package > Regenerate a specific field of a persona package using LLM. Requires the full persona package context to regenerate any individual field. Valid fields to regenerate: simulationName, personaName, personaDescription, mission, successCriteria ## OpenAPI ````yaml https://api-trial.cognigy.ai/testing/openapi/openapi-viewer.json post /personas/regenerate-field openapi: 3.0.0 info: title: SIMULATOR OPENAPI REST-ful-API Reference version: 2025.20.0 description: > ### Introduction This is the [OpenAPI 3.0](https://swagger.io/specification/) documentation of the [REST](https://en.wikipedia.org/wiki/Representational_state_transfer)-ful SIMULATOR OPENAPI API. ### Cross-Origin Resource Sharing This API features Cross-Origin Resource Sharing (CORS) implemented in compliance with [W3C spec](https://www.w3.org/TR/cors/), which allows cross-domain communication from the browser. All responses have a wildcard same-origin header which makes the API completely accessible. ### Authentication SIMULATOR OPENAPI offers following forms of authentication: - Bearer Token (JWT) - API Key ### Error Handling This API uses HTTP status codes equal or above 400 to indicate errors. Error details are generated in compliance with [RFC 7807 - "Problem Details for HTTP APIs"](https://tools.ietf.org/html/rfc7807). Every error response contains a traceId, which should be provided to the SIMULATOR OPENAPI Technical Support when reporting an error. contact: name: Cognigy Technical Support url: https://www.cognigy.com email: support@cognigy.com license: name: Cognigy Proprietary License servers: - url: https://api-trial.cognigy.ai/testing description: Cognigy Service Testing API security: - bearerAuth: [] - apiKeyAuth: [] tags: - name: Simulations description: >- Simulation management operations - Create, read, update, and delete simulations externalDocs: description: SIMULATOR OPENAPI Documentation url: https://docs.cognigy.com/docs/service-testing/ paths: /personas/regenerate-field: post: tags: - Personas summary: Regenerate a specific field of a persona package description: > Regenerate a specific field of a persona package using LLM. Requires the full persona package context to regenerate any individual field. Valid fields to regenerate: simulationName, personaName, personaDescription, mission, successCriteria operationId: regeneratePersonaField parameters: - name: projectId in: query required: true schema: type: string description: Project identifier requestBody: required: true content: application/json: schema: type: object properties: projectReference: type: string description: >- Project reference for context identification (alternative to projectId query parameter) fieldToRegenerate: type: string enum: - simulationName - personaName - personaDescription - mission - successCriteria description: Field name to regenerate simulationName: type: string description: Current scenario name personaName: type: string description: Current persona name personaDescription: type: string description: Current persona description mission: type: string description: Current mission successCriteria: type: array description: Current success criteria array items: type: object properties: type: type: string description: Success criterion type params: type: object description: Success criterion parameters required: - type - params successCriteriaIndex: type: integer description: >- Optional: Index of specific success criterion to regenerate (only when fieldToRegenerate is 'successCriteria') required: - fieldToRegenerate - simulationName - personaName - personaDescription - mission - successCriteria responses: '200': description: Persona field regenerated successfully content: application/json: schema: type: object properties: success: type: boolean description: Whether the regeneration was successful personaPackage: type: object description: Complete persona package with the regenerated field properties: simulationName: type: string description: Simulation name personaName: type: string description: Persona name personaDescription: type: string description: Persona description mission: type: string description: Mission successCriteria: type: array description: Success criteria items: type: object properties: type: type: string description: Success criterion type params: type: object description: Success criterion parameters required: - type - params required: - simulationName - personaName - personaDescription - mission - successCriteria metadata: type: object description: Optional metadata about the regeneration properties: requestId: type: string description: Request identifier processedAt: type: string description: Timestamp when processed model: type: string description: LLM model used regeneratedField: type: string description: Field that was regenerated regeneratedIndex: type: integer description: Index of regenerated success criterion (if applicable) required: - success - personaPackage '400': description: Bad Request - Invalid input parameters content: application/json: schema: type: object properties: error: type: string description: Validation error message field: type: string description: Field that failed validation code: type: string description: Validation error code traceId: type: string description: Trace ID for debugging required: - error - field '401': description: Unauthorized - Invalid or missing authentication content: application/json: schema: type: object properties: error: type: string description: Unauthorized error message code: type: string description: Unauthorized error code traceId: type: string description: Trace ID for debugging required: - error '403': description: Forbidden - Insufficient permissions content: application/json: schema: type: object properties: error: type: string description: Forbidden error message code: type: string description: Forbidden error code traceId: type: string description: Trace ID for debugging required: - error '500': description: Internal Server Error - Server error content: application/json: schema: type: object properties: error: type: string description: Error message code: type: string description: Error code traceId: type: string description: Trace ID for debugging required: - error security: - bearerAuth: [] - apiKeyAuth: [] components: securitySchemes: bearerAuth: type: http scheme: bearer bearerFormat: JWT description: JWT Bearer Token for authentication apiKeyAuth: type: apiKey in: header name: X-API-Key description: API Key for authentication ````