> ## Documentation Index > Fetch the complete documentation index at: https://ancplua.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. # Get apiv1sessions 1 > Get session by ID ## OpenAPI ````yaml /api-reference/openapi.yaml get /api/v1/sessions/{sessionId} openapi: 3.0.0 info: title: QYL Observability API version: '2026-01-26' servers: - url: https://api.staging.qyl.dev description: QYL Staging API variables: {} - url: https://api.qyl.dev description: QYL Production API variables: {} security: [] tags: - name: Streaming - name: Traces - name: Logs - name: Metrics - name: Sessions - name: Errors - name: Deployments - name: Services - name: Health - name: Workspaces - name: Onboarding - name: Configurator - name: Issues - name: Workflows - name: Search - name: Alerts paths: /api/v1/sessions/{sessionId}: get: tags: - Sessions description: Get session by ID operationId: SessionsApi_get parameters: - name: sessionId in: path required: true schema: type: string responses: '200': description: The request has succeeded. content: application/json: schema: $ref: '#/components/schemas/Qyl.Domains.Observe.Session.SessionEntity' '404': description: Resource not found (404) headers: X-Trace-Id: required: false description: Trace ID for correlation schema: type: string X-Request-Id: required: false description: Request ID for support schema: type: string content: application/json: schema: $ref: '#/components/schemas/Qyl.Common.Errors.NotFoundError' '500': description: Internal server error (500) headers: X-Trace-Id: required: false description: Trace ID for correlation schema: type: string X-Request-Id: required: false description: Request ID for support schema: type: string content: application/json: schema: $ref: '#/components/schemas/Qyl.Common.Errors.InternalServerError' components: schemas: Qyl.Domains.Observe.Session.SessionEntity: type: object required: - session.id - start_time - trace_count - span_count - error_count - services - state properties: session.id: allOf: - $ref: '#/components/schemas/Qyl.Common.SessionId' description: Session ID user.id: allOf: - $ref: '#/components/schemas/Qyl.Common.UserId' description: User ID (if authenticated) start_time: type: string format: date-time description: Session start time end_time: type: string format: date-time description: Session end time duration_ms: allOf: - $ref: '#/components/schemas/Qyl.Common.DurationMs' description: Session duration in milliseconds trace_count: type: integer format: int32 minimum: 0 description: Total trace count in session span_count: type: integer format: int32 minimum: 0 description: Total span count in session error_count: type: integer format: int32 minimum: 0 description: Total error count in session services: type: array items: type: string description: Service names observed in this session state: allOf: - $ref: '#/components/schemas/Qyl.Domains.Observe.Session.SessionState' description: Session state client: allOf: - $ref: >- #/components/schemas/Qyl.Domains.Observe.Session.SessionClientInfo description: Client information geo: allOf: - $ref: '#/components/schemas/Qyl.Domains.Observe.Session.SessionGeoInfo' description: Location information genai_usage: allOf: - $ref: >- #/components/schemas/Qyl.Domains.Observe.Session.SessionGenAiUsage description: GenAI usage summary description: Complete session entity with aggregated data x-csharp-type: SessionEntity x-duckdb-table: session_entities Qyl.Common.Errors.NotFoundError: type: object required: - title properties: title: type: string enum: - Not Found resource_type: type: string description: The type of resource that was not found resource_id: type: string description: The identifier that was not found allOf: - $ref: '#/components/schemas/Qyl.Common.Errors.ProblemDetails' description: Resource not found (404) Qyl.Common.Errors.InternalServerError: type: object required: - title properties: title: type: string enum: - Internal Server Error error_code: type: string description: Error code for support reference allOf: - $ref: '#/components/schemas/Qyl.Common.Errors.ProblemDetails' description: Internal server error (500) Qyl.Common.SessionId: type: string minLength: 1 maxLength: 128 description: Unique session identifier x-csharp-type: SessionId x-csharp-struct: true x-duckdb-type: VARCHAR(128) Qyl.Common.UserId: type: string minLength: 1 maxLength: 256 description: User identifier (pseudonymized for privacy) Qyl.Common.DurationMs: type: number format: double minimum: 0 description: Duration in milliseconds x-csharp-type: double x-duckdb-type: DOUBLE Qyl.Domains.Observe.Session.SessionState: type: string enum: - active - idle - ended - timed_out - invalidated description: Session states Qyl.Domains.Observe.Session.SessionClientInfo: type: object properties: ip: allOf: - $ref: '#/components/schemas/Qyl.Common.IpAddress' description: Client IP address user_agent: allOf: - $ref: '#/components/schemas/Qyl.Common.UserAgent' description: User agent string device_type: allOf: - $ref: '#/components/schemas/Qyl.Domains.Observe.Session.DeviceType' description: Device type os: type: string description: Operating system browser: type: string description: Browser name browser_version: type: string description: Browser version description: Session client information Qyl.Domains.Observe.Session.SessionGeoInfo: type: object properties: country_code: type: string description: Country code (ISO 3166-1 alpha-2) country_name: type: string description: Country name region: type: string description: Region/state city: type: string description: City postal_code: type: string description: Postal code timezone: type: string description: Timezone description: Session geographic information Qyl.Domains.Observe.Session.SessionGenAiUsage: type: object required: - request_count - total_input_tokens - total_output_tokens - models_used - providers_used properties: request_count: type: integer format: int32 minimum: 0 description: Total GenAI requests in session total_input_tokens: allOf: - $ref: '#/components/schemas/Qyl.Common.TokenCount' description: Total input tokens consumed total_output_tokens: allOf: - $ref: '#/components/schemas/Qyl.Common.TokenCount' description: Total output tokens generated models_used: type: array items: type: string description: Models used in session providers_used: type: array items: type: string description: Providers used in session estimated_cost_usd: type: number format: double description: Estimated cost in USD description: Session GenAI usage summary Qyl.Common.Errors.ProblemDetails: type: object required: - type - title - status properties: type: type: string format: uri description: A URI reference identifying the problem type default: about:blank title: type: string description: A short, human-readable summary of the problem type status: type: integer format: int32 description: >- The HTTP status code (informational only, actual code set by subtype) detail: type: string description: A human-readable explanation specific to this occurrence instance: type: string format: uri description: A URI reference identifying the specific occurrence timestamp: type: string format: date-time description: Timestamp of the error description: RFC 7807 Problem Details for HTTP APIs Qyl.Common.IpAddress: type: string description: IP address (IPv4 or IPv6) Qyl.Common.UserAgent: type: string description: User agent string example: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 Qyl.Domains.Observe.Session.DeviceType: type: string enum: - desktop - mobile - tablet - tv - console - wearable - iot - bot - unknown description: Device types Qyl.Common.TokenCount: type: integer format: int64 minimum: 0 description: Token count (for LLM operations) x-csharp-type: long x-duckdb-type: BIGINT ````