{
  "fluid_hypothesis": {
    "audit": {
      "decision_refs": [
        "D-2811"
      ],
      "immutable_event_refs": [
        "EV-990218"
      ]
    },
    "backend_requirements": {
      "required": false,
      "requirement_refs": []
    },
    "candidate_revision_refs": [
      "R-000221"
    ],
    "complexity": {
      "expected_delta": {
        "cognitive_load": -0.2,
        "concept_count": 0,
        "operation_count": 1,
        "semantic_overlap": 0.1,
        "surface_area": 1
      },
      "score": 0.18
    },
    "created_at": "2026-09-04T12:00:00Z",
    "created_by": {
      "id": "fluid-daimon/customer-finance-api",
      "type": "daimon"
    },
    "economics": {
      "currency": "EUR",
      "estimated_experiment_cost": 18.0,
      "estimated_implementation_cost": 40.0,
      "expected_value_class": "MEDIUM"
    },
    "expected_outcomes": [
      {
        "baseline": 2.7,
        "cohort": "all",
        "direction": "lower",
        "metric": "requests_per_completed_task",
        "target": 1.2
      },
      {
        "baseline": 1.0,
        "cohort": "all",
        "direction": "lower",
        "metric": "client_side_sort_workarounds",
        "target": 0.2
      }
    ],
    "experiment_refs": [
      "E-000093"
    ],
    "explanation": {
      "claim": "Consumers treat \"latest invoice\" as a domain-level concept and the existing generic collection interface does not present that concept directly.\n",
      "reach": {
        "explains": [
          "P-1831",
          "P-1834"
        ],
        "notes": "Medium reach: explains several related request patterns but not broader financial-context pressure.\n",
        "score": 0.42
      }
    },
    "failure_criteria": {
      "expression": "any hard guardrail violation OR adoption below 5% after 30 days when equally discoverable\n"
    },
    "fitness_dimensions": {
      "expected": {
        "client_utility": 0.7,
        "compatibility": 0.0,
        "correctness": 0.0,
        "discoverability": 0.65,
        "maintainability": -0.05,
        "operational_cost": 0.0,
        "performance": 0.1,
        "reliability": 0.0,
        "security": 0.0,
        "simplicity": -0.15
      }
    },
    "guardrails": [
      {
        "metric": "p95_latency_ms",
        "operator": "<=",
        "threshold": 315
      },
      {
        "metric": "authorization_scope_change",
        "operator": "==",
        "threshold": false
      },
      {
        "metric": "backend_query_count_delta",
        "operator": "<=",
        "threshold": 0
      }
    ],
    "id": "H-000184",
    "interface_id": "customer-finance-api",
    "learning_value": {
      "notes": "Useful signal for whether first-class convenience resources improve agent and partner integration behavior.\n",
      "score": 0.56
    },
    "observation": {
      "affected_cohorts": [
        "partner-integrations",
        "coding-agents"
      ],
      "evidence_refs": [
        "telemetry:invoice-pattern-2026w36",
        "feedback:F-9821"
      ],
      "observation_window": {
        "end": "2026-09-01T00:00:00Z",
        "start": "2026-08-15T00:00:00Z"
      },
      "summary": "A significant consumer cohort retrieves invoice collections, sorts them by issue date, and discards all but the first item.\n"
    },
    "outcome": {
      "evidence_refs": [],
      "status": null,
      "summary": null
    },
    "pressure": {
      "classes": [
        "successful_but_inefficient_usage",
        "repeated_expectation_mismatch"
      ],
      "confidence": 0.88,
      "severity": 0.61
    },
    "priority": {
      "decided_by": "optimization-policy-v3",
      "score": 0.71
    },
    "proposed_adaptation": {
      "candidate_contract": {
        "method": "GET",
        "path": "/customers/{id}/invoices/latest"
      },
      "class": "contract",
      "implementation_scope": "interface_only",
      "summary": "Add an explicit latest-invoice retrieval capability.\n"
    },
    "risk": {
      "level": "LOW",
      "reasons": [
        "read-only operation",
        "no authorization expansion"
      ]
    },
    "schema_version": "0.1",
    "state": "PRIORITIZED",
    "success_criteria": {
      "expression": "requests_per_completed_task <= 1.2 AND no hard guardrail violation\n"
    },
    "title": "Provide direct latest-invoice capability"
  }
}