> ## Documentation Index > Fetch the complete documentation index at: https://docs.trajectory.ai/llms.txt > Use this file to discover all available pages before exploring further. # Get Benchmark Diagnostics > Get task outcomes and failure reasons after a benchmark diagnostic finishes. ## OpenAPI ````yaml /openapi.json get /api/v1/diagnostics/{benchmark_diagnostic_id} openapi: 3.1.0 info: title: Trajectory API version: 0.1.0 x-trajectory-api-version: '2026-10-14' description: >- This contract is API version 2026-10-14. The optional Trajectory-API-Version header pins it, and tmp-contract is accepted as an alias. Requests without the header get this version. Version 2026-10-07 and the pre-launch legacy response formats are retired. servers: - url: https://api.trajectory.ai security: [] tags: - name: agents x-group: Agents - name: benchmarks x-group: Specs (benchmarks) - name: diagnostics x-group: Diagnostics - name: benchmark-ingestion x-group: Spec (benchmark) submissions - name: eval x-group: Evaluations - name: training x-group: Training - name: deployments x-group: Deployments - name: model-endpoints x-group: Model endpoints - name: inference x-group: Inference - name: trajectories x-group: Trajectories - name: artifacts x-group: Artifacts - name: telemetry x-group: Telemetry - name: supported-models x-group: Supported models - name: organizations x-group: Organizations - name: secrets x-group: Secrets paths: /api/v1/diagnostics/{benchmark_diagnostic_id}: get: tags: - diagnostics summary: Get Benchmark Diagnostics description: >- Get task outcomes and failure reasons after a benchmark diagnostic finishes. operationId: getBenchmarkDiagnostics parameters: - name: benchmark_diagnostic_id in: path required: true schema: type: string title: Benchmark Diagnostic Id responses: '200': description: Successful Response content: application/json: schema: $ref: '#/components/schemas/BenchmarkDiagnosticsResponse' default: $ref: '#/components/responses/ApiErrorResponse' security: - ApiKeyAuth: [] components: schemas: BenchmarkDiagnosticsResponse: properties: benchmark_diagnostic_id: type: string title: Benchmark Diagnostic Id bench_id: type: string title: Bench Id eval_run_id: type: string title: Eval Run Id base_model_slug: type: string title: Base Model Slug description: Model used for the diagnostic run. status: type: string enum: - completed - failed - cancelled title: Status created_at: type: string format: date-time title: Created At updated_at: type: string format: date-time title: Updated At started_at: anyOf: - type: string format: date-time - type: 'null' title: Started At completed_at: anyOf: - type: string format: date-time - type: 'null' title: Completed At failure: anyOf: - additionalProperties: true type: object - type: 'null' title: Failure description: Run-wide failure summary; task errors appear on tasks. task_counts: $ref: '#/components/schemas/BenchmarkDiagnosticTaskCounts' description: Number of tasks by final status. tasks: items: $ref: '#/components/schemas/BenchmarkDiagnosticTask' type: array title: Tasks type: object required: - benchmark_diagnostic_id - bench_id - eval_run_id - base_model_slug - status - created_at - updated_at - started_at - completed_at - failure - task_counts - tasks title: BenchmarkDiagnosticsResponse BenchmarkDiagnosticTaskCounts: properties: completed: type: integer title: Completed failed: type: integer title: Failed cancelled: type: integer title: Cancelled type: object required: - completed - failed - cancelled title: BenchmarkDiagnosticTaskCounts BenchmarkDiagnosticTask: properties: task_id: type: string title: Task Id runtime_id: anyOf: - type: string - type: 'null' title: Runtime Id status: type: string enum: - pending - running - completed - failed - cancelled title: Status failure: anyOf: - additionalProperties: true type: object - type: 'null' title: Failure description: Failure for this task, including rollout details when available. trajectory_id: anyOf: - type: string - type: 'null' title: Trajectory Id description: Trajectory of the task's rollout; null before one was created. termination_reason: anyOf: - type: string - type: 'null' title: Termination Reason description: Recorded reason the trajectory ended; null when not recorded. reward: anyOf: - type: number - type: 'null' title: Reward description: Reward recorded for the trajectory; null when none was recorded. created_at: type: string format: date-time title: Created At updated_at: type: string format: date-time title: Updated At started_at: anyOf: - type: string format: date-time - type: 'null' title: Started At completed_at: anyOf: - type: string format: date-time - type: 'null' title: Completed At type: object required: - task_id - runtime_id - status - failure - created_at - updated_at - started_at - completed_at title: BenchmarkDiagnosticTask ApiErrorEnvelope: properties: error: $ref: '#/components/schemas/ApiErrorBody' required: - error title: ApiErrorEnvelope type: object ApiErrorBody: properties: type: $ref: '#/components/schemas/ErrorType' code: type: string title: Code message: type: string title: Message param: anyOf: - type: string - type: 'null' default: null title: Param doc_url: type: string title: Doc Url context: additionalProperties: true title: Context type: object required: - type - code - message - doc_url - context title: ApiErrorBody type: object ErrorType: enum: - invalid_request_error - authentication_error - permission_error - conflict_error - billing_error - rate_limit_error - dependency_error - api_error title: ErrorType type: string responses: ApiErrorResponse: description: >- Common API error. Possible codes: `authentication_required`, `permission_denied`, `validation_error`, `rate_limited`, `internal_error`, `service_unavailable`. headers: X-Request-ID: $ref: '#/components/headers/RequestId' Trajectory-Should-Retry: $ref: '#/components/headers/TrajectoryShouldRetry' Retry-After: $ref: '#/components/headers/RetryAfter' content: application/json: schema: $ref: '#/components/schemas/ApiErrorEnvelope' headers: RequestId: schema: type: string TrajectoryShouldRetry: schema: type: boolean RetryAfter: schema: type: string securitySchemes: ApiKeyAuth: type: apiKey in: header name: X-API-Key description: Organization API key ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.