{"id":"bench-orch-005","slug":"bench-orch-005","title":"Parallel fan-out with idempotent write","prompt":"Fan out 5 URL fetches to workers; write unique findings to shared memory without dup keys; produce merged list length = unique URLs succeeded.","successCriteria":["No duplicate keys","Merged length correct","Failed URLs listed separately"],"scoringHints":["Race/idempotency"],"agentTypes":["multi_agent_orchestrator"],"primaryType":"multi_agent_orchestrator","dimensions":["collaborationHandoff","multiStepRobustness","taskSuccess","planningDecomposition"],"difficulty":"hard","timeBudgetSec":1000,"tags":["fan-out","memory"],"needsTools":true,"needsWeb":true,"needsCode":false,"holdout":false,"adversarialFlags":[],"type":{"id":"multi_agent_orchestrator","slug":"multi_agent_orchestrator","name":"Multi-agent orchestrator","definition":"Controller that decomposes work, routes to specialist agents/tools, merges results, resolves conflicts, and produces a coherent final artifact with clear ownership.","typicalTools":["agent registry","message bus / A2A","shared memory","router/planner","critic/verifier agents","budget governor"],"whatGoodLooksLike":"Correct merge without duplicated work; explicit handoffs; conflict detection; budget adherence; failure isolation; auditable assignment log.","dimensionWeightsHigh":["collaborationHandoff","planningDecomposition","taskSuccess","efficiency","multiStepRobustness","honestyCalibration"],"relatedBenchmarks":["Multi-agent coordination evals; ARE/Gaia2 multi-actor vibes"],"exampleJtbds":["durable-agent-workflows","langgraph-deploy","agent-tool-router","stateful-agent-runtime"],"dimensionWeights":{"taskSuccess":0.15,"toolUseQuality":0.06,"planningDecomposition":0.14,"reliabilityConsistency":0.05,"honestyCalibration":0.06,"safetyPolicy":0.05,"efficiency":0.08,"memoryContext":0.05,"instructionFollowing":0.05,"multiStepRobustness":0.08,"collaborationHandoff":0.15,"groundingEvidence":0.03,"communicationClarity":0.03,"adaptivity":0.02},"defaultTaskIds":["bench-orch-001","bench-orch-002","bench-orch-003","bench-orch-004","bench-orch-005","bench-cross-005","bench-orch-006","bench-orch-007","bench-orch-008"]},"gold":null,"note":"Holdout gold is never returned. Grade via traces + verifiers."}