{"abstract":"Duplicate array values pass a uniqueness constraint.","category":"Tool call schema validation","checks":6,"contract":"Array uniqueness uses JSON-like type-sensitive scalar identity; an empty or singleton list is unique.","contract_signature":"values","evaluation_group":"w3-schema-unique-array-items","failed_approach":"A set catches common duplicates but treats true and one as the same value.","family":"w3-tool-call-schema-validation-unique-array-items","id":"FA-99791","implementations":{"attempt":{"sha256":"3fa63fc90cacd411619f9ade93bc90ad544ac63cb3c699c0f6d363c3a9404b84","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(values):\n    return len(set(values))==len(values)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('distinct values',solve([N,N+1]),True)\ncheck('duplicate string',solve(['x','x']),False)\ncheck('bool and integer distinct',solve([True,1]),True)\ncheck('empty',solve([]),True)\ncheck('singleton',solve([False]),True)\ncheck('repeated null',solve([None,None]),False)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"8c15fbde4375eb252d6c35e64d3d24234ea0252dd60316e25989e48c703cfa17","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(values):\n    return all(v in values for v in values)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('distinct values',solve([N,N+1]),True)\ncheck('duplicate string',solve(['x','x']),False)\ncheck('bool and integer distinct',solve([True,1]),True)\ncheck('empty',solve([]),True)\ncheck('singleton',solve([False]),True)\ncheck('repeated null',solve([None,None]),False)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":"Self-contained toy JSON-like schema contract over in-memory Python values; no compatibility with a production schema standard or callable binding is claimed. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"w3-tool-call-schema-validation-unique-array-items","generated_at":"2026-09-30T16:48:28.064411+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Tool argument validation prevents malformed structured payloads from entering a deterministic downstream operation.","root_cause":"Each value is tested for membership in the same list, a tautology that never detects repetition.","sha256":"71f6f60039407d9cdde1a7f64fc6a6a3677d69ee2424c5fa6ac08416f84bb943","title":"Duplicate array values pass a uniqueness constraint · case 01","variant":1,"variant_policy":"The fixture code references N, supplied as 1 through 5. Fixed boundary checks may repeat. These records share one mechanism and must remain together in evaluation splits.","verified":true,"visibility":"public","verification":{"attempt":{"elapsed_ms":27.795,"exit_code":1,"observations":[{"actual":true,"check":"distinct values","expected":true,"passed":true},{"actual":false,"check":"duplicate string","expected":false,"passed":true},{"actual":false,"check":"bool and integer distinct","expected":true,"passed":false},{"actual":true,"check":"empty","expected":true,"passed":true},{"actual":true,"check":"singleton","expected":true,"passed":true},{"actual":false,"check":"repeated null","expected":false,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"distinct values\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"duplicate string\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"bool and integer distinct\", \"actual\": false, \"expected\": true, \"passed\": false}, {\"check\": \"empty\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"singleton\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"repeated null\", \"actual\": false, \"expected\": false, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":27.08,"exit_code":1,"observations":[{"actual":true,"check":"distinct values","expected":true,"passed":true},{"actual":true,"check":"duplicate string","expected":false,"passed":false},{"actual":true,"check":"bool and integer distinct","expected":true,"passed":true},{"actual":true,"check":"empty","expected":true,"passed":true},{"actual":true,"check":"singleton","expected":true,"passed":true},{"actual":true,"check":"repeated null","expected":false,"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"distinct values\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"duplicate string\", \"actual\": true, \"expected\": false, \"passed\": false}, {\"check\": \"bool and integer distinct\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"empty\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"singleton\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"repeated null\", \"actual\": true, \"expected\": false, \"passed\": false}], \"passed\": false}\n"}},"member_only":{"stages":["fixed"],"fields":["implementations.fixed","verification.fixed","harness","repair"],"note":"The verified repair, its recorded checks, the repair description, and the scoring harness are available to members."}}