> ## Documentation Index > Fetch the complete documentation index at: https://docs.mixpeek.com/docs/llms.txt > Use this file to discover all available pages before exploring further. # Get Execution > Get execution details and statistics. ## OpenAPI ````yaml get /v1/retrievers/{retriever_id}/executions/{execution_id} openapi: 3.1.0 info: title: Mixpeek API description: >- This is the Mixpeek API, providing access to various endpoints for data processing and retrieval. termsOfService: https://mixpeek.com/terms contact: name: Mixpeek Support url: https://mixpeek.com/contact email: info@mixpeek.com version: '0.82' servers: - url: https://api.mixpeek.com description: Production security: [] paths: /v1/retrievers/{retriever_id}/executions/{execution_id}: get: tags: - Retrievers summary: Get Execution description: Get execution details and statistics. operationId: get_execution_v1_retrievers__retriever_id__executions__execution_id__get parameters: - name: retriever_id in: path required: true schema: type: string description: Retriever ID or name. title: Retriever Id description: Retriever ID or name. - name: execution_id in: path required: true schema: type: string description: Execution identifier. title: Execution Id description: Execution identifier. responses: '200': description: Successful Response content: application/json: schema: $ref: '#/components/schemas/ExecutionDetail' '400': description: Bad Request content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '401': description: Unauthorized content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '403': description: Forbidden content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '404': description: Not Found content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '422': description: Validation Error content: application/json: schema: $ref: '#/components/schemas/HTTPValidationError' '500': description: Internal Server Error content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' components: schemas: ExecutionDetail: properties: retriever_id: type: string title: Retriever Id description: >- The retriever that was executed. Use this to link interactions back to the retriever for learned fusion. default: '' examples: - ret_abc123def456 execution_id: type: string title: Execution Id description: >- REQUIRED. Unique identifier for this execution run. Use this ID to track execution status, retrieve execution details, or query execution history. Format: 'exec_' prefix followed by alphanumeric token. examples: - exec_abc123def456 - exec_xyz789 status: type: string title: Status description: >- REQUIRED. Execution status indicating current state. Common values: 'completed', 'failed', 'processing', 'pending'. Check this field to determine if execution succeeded or requires retry. examples: - completed - failed - processing documents: items: additionalProperties: true type: object type: array title: Documents description: >- REQUIRED. Final document results after retriever completion. Contains documents that passed through all retriever stages. Each document may include: document_id, payload (full document data), score (relevance score), metadata (collection-specific fields), and any fields added by enrichment/join stages. Empty array indicates no documents matched the query criteria. Note: Legacy format may use 'final_results' instead of 'documents'. examples: - - document_id: doc_123 payload: metadata: category: AI text: Sample content score: 0.95 - document_id: doc_456 payload: metadata: category: ML text: Another document score: 0.88 results: anyOf: - items: additionalProperties: true type: object type: array - type: 'null' title: Results description: >- DEPRECATED alias for `documents`. Previously a computed field that duplicated `documents` byte-for-byte in every response (~half the payload). It is no longer populated by default to cut response size; pass `?include_legacy_results=true` to restore it during migration. Prefer `documents` — it is and has always been the canonical field. See FRUSTRATIONS.md 2026-04-02 / 2026-06-29. pagination: additionalProperties: true type: object title: Pagination description: >- REQUIRED. Pagination metadata structure. Format varies by pagination method: Offset pagination: {total, limit, offset, has_next, has_previous}, Cursor pagination: {cursor, has_next, page_size}, Keyset pagination: {next_cursor, has_next}. Use this to navigate through result pages. examples: - has_next: true limit: 10 offset: 0 total: 100 - cursor: abc123 has_next: false page_size: 20 stage_statistics: $ref: '#/components/schemas/RetrieverExecutionStatistics' description: >- REQUIRED. Per-stage execution statistics including timing, document counts, cache hit rates, and stage-specific metrics. Use this to understand retriever performance and identify bottlenecks. budget: additionalProperties: true type: object title: Budget description: >- REQUIRED. Budget usage snapshot for this execution. Contains: credits_used (credits consumed), credits_remaining (remaining budget), time_used_ms (execution time), and budget limits. Use this to track resource consumption and enforce budget limits. examples: - credits_remaining: 99.5 credits_used: 0.5 time_used_ms: 150 cached_at: anyOf: - type: number - type: 'null' title: Cached At description: >- OPTIONAL. Unix timestamp (seconds) when this result was cached. Present only when the full response was served from the retriever-level cache. Compute freshness as: time.time() - cached_at. warnings: items: type: string type: array title: Warnings description: >- OPTIONAL. Execution warnings that did not prevent results but indicate potential issues — e.g. filtering on unindexed fields. Empty when there are no warnings. error: anyOf: - type: string - type: 'null' title: Error description: >- OPTIONAL. Retriever-level error message if execution failed. Only present when status='failed'. Contains human-readable error description to help diagnose the failure. Check stage_statistics for stage-specific errors. examples: - 'Retriever execution failed: Collection not found' - 'Budget exceeded: Maximum credits limit reached' optimization_applied: type: boolean title: Optimization Applied description: >- OPTIONAL. Whether automatic pipeline optimizations were applied before execution. Mixpeek automatically optimizes retrieval pipelines for performance by reordering stages, merging operations, and pushing work to the database layer. Optimizations preserve logical equivalence - you get the same results, just faster. When true, see optimization_summary for details about what changed. default: false examples: - true - false optimization_summary: anyOf: - additionalProperties: true type: object - type: 'null' title: Optimization Summary description: >- OPTIONAL. Summary of pipeline optimizations applied before execution. Only present when optimization_applied=true. Contains: - original_stage_count: Number of stages in your original pipeline - optimized_stage_count: Number of stages after optimization - optimization_time_ms: Time spent optimizing (typically <100ms) - rules_applied: List of optimization rules that fired - stage_reduction_pct: Percentage reduction in stage count Use this to understand how the optimizer improved your pipeline. See OptimizationRuleType enum for detailed rule descriptions. examples: - optimization_time_ms: 8.2 optimized_stage_count: 3 original_stage_count: 5 rules_applied: - push_down_filters - group_by_push_down stage_reduction_pct: 40 - optimization_time_ms: 2.1 optimized_stage_count: 3 original_stage_count: 3 rules_applied: [] stage_reduction_pct: 0 learned_fusion_context: anyOf: - additionalProperties: true type: object - type: 'null' title: Learned Fusion Context description: >- OPTIONAL. Learned fusion context when the retriever uses learned fusion (auto-tune) for weight optimization. Contains: context_key (resolution level used), sampled_weights (per-feature weight vector), feature_uris (features that were weighted), effective_exploration (Thompson sampling exploration rate), context_level ('personal', 'segment', or 'global'). Only present when learned fusion is active on this retriever. created_at: type: string format: date-time title: Created At description: Timestamp when execution began completed_at: anyOf: - type: string format: date-time - type: 'null' title: Completed At description: Timestamp when execution finished current_stage: anyOf: - type: string - type: 'null' title: Current Stage description: Stage currently running when execution in-flight stages_completed: type: integer minimum: 0 title: Stages Completed description: Number of stages finished so far default: 0 total_stages: type: integer minimum: 0 title: Total Stages description: Total stages configured default: 0 type: object required: - execution_id - status title: ExecutionDetail description: Alias wrapper for execution detail documentation. ErrorResponse: properties: success: type: boolean title: Success description: Always false for error responses default: false status: type: integer title: Status description: HTTP status code for this error error: $ref: '#/components/schemas/ErrorDetail' description: Error details payload type: object required: - status - error title: ErrorResponse description: Error response model. examples: - error: details: id: ns_123 resource: namespace message: Namespace not found type: NotFoundError status: 404 success: false HTTPValidationError: properties: detail: items: $ref: '#/components/schemas/ValidationError' type: array title: Detail type: object title: HTTPValidationError RetrieverExecutionStatistics: properties: stages: additionalProperties: $ref: '#/components/schemas/StageStatistics' type: object title: Stages description: Per-stage statistics keyed by stage instance name (REQUIRED). total_time_ms: type: number minimum: 0 title: Total Time Ms description: Total retriever execution time in milliseconds (REQUIRED). default: 0 credits_used: type: number minimum: 0 title: Credits Used description: Total credits consumed across all stages (OPTIONAL in MVP). default: 0 type: object title: RetrieverExecutionStatistics description: Aggregated execution statistics for an entire retriever execution run. ErrorDetail: properties: message: type: string title: Message description: Human-readable error message type: type: string title: Type description: Stable error type identifier (machine-readable) code: anyOf: - type: string - type: 'null' title: Code description: >- Fine-grained error code for programmatic handling (e.g., namespace_name_taken, feature_extractor_not_found). Present only when consumers may need to branch on a specific error condition. details: anyOf: - additionalProperties: true type: object - type: 'null' title: Details description: >- Optional structured details to help debugging (validation errors, IDs, etc.) type: object required: - message - type title: ErrorDetail description: Error detail model. ValidationError: properties: loc: items: anyOf: - type: string - type: integer type: array title: Location msg: type: string title: Message type: type: string title: Error Type type: object required: - loc - msg - type title: ValidationError StageStatistics: properties: input_count: type: integer minimum: 0 title: Input Count description: Number of documents received by the stage (REQUIRED). output_count: type: integer minimum: 0 title: Output Count description: Number of documents emitted by the stage (REQUIRED). duration_ms: type: number minimum: 0 title: Duration Ms description: Wall-clock duration in milliseconds (REQUIRED). efficiency: type: number minimum: 0 title: Efficiency description: Output/Input ratio. 0 when input_count is 0 (REQUIRED). cache_hit: anyOf: - type: boolean - type: 'null' title: Cache Hit description: Indicates whether the result originated from stage cache (OPTIONAL). cached_at: anyOf: - type: number - type: 'null' title: Cached At description: >- Unix timestamp when this stage result was cached. Present only on cache hits. error: anyOf: - type: string - type: 'null' title: Error description: >- Stage-specific error message if execution failed but retriever execution continued (OPTIONAL). llm_calls: anyOf: - type: integer minimum: 0 - type: 'null' title: Llm Calls description: Number of LLM invocations performed by the stage (OPTIONAL). tokens_used: anyOf: - type: integer minimum: 0 - type: 'null' title: Tokens Used description: Total tokens consumed by the stage (OPTIONAL, only for LLM stages). metadata: additionalProperties: true type: object title: Metadata description: >- Stage-specific metadata containing additional execution details (OPTIONAL). For example, join stages include: join_strategy, join_type, matched_count, match_rate, etc. LLM stages may include: model_name, temperature, max_tokens, etc. type: object required: - input_count - output_count - duration_ms - efficiency title: StageStatistics description: Execution metrics for a single stage in a retriever execution run. examples: - cache_hit: false duration_ms: 123.4 efficiency: 0.05 input_count: 5000 output_count: 250 ````