{"abstract":"Required property presence is confused with truthiness.","category":"Tool call schema validation","checks":6,"contract":"A mapping is valid when every required key exists, even if its value is null, false, zero, or empty.","contract_signature":"obj, required","evaluation_group":"w3-schema-required-properties","failed_approach":"Rejecting null values still rejects a present property when null is a valid value.","family":"w3-tool-call-schema-validation-required-properties","id":"FA-99741","implementations":{"attempt":{"sha256":"a639604ea3df29442f9475f6034404cafb61d84016ede9255b140dcfb4e8871f","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(obj, required):\n    return all(k in obj and obj[k] is not None for k in required)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('false value present',solve({'enabled':False},['enabled']),True)\ncheck('zero present',solve({'count':0},['count']),True)\ncheck('null present',solve({'x':None},['x']),True)\ncheck('missing key',solve({'x':1},['y']),False)\ncheck('empty requirements',solve({},[]),True)\ncheck('mixed keys',solve({'a':0,'b':''},['a','b']),True)\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":"2b7cad37f6abb7505fa839e786c15e0633c5f6f6dccf8ee20b6542a7b3f5ba2b","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(obj, required):\n    return all(obj.get(k) for k in required)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('false value present',solve({'enabled':False},['enabled']),True)\ncheck('zero present',solve({'count':0},['count']),True)\ncheck('null present',solve({'x':None},['x']),True)\ncheck('missing key',solve({'x':1},['y']),False)\ncheck('empty requirements',solve({},[]),True)\ncheck('mixed keys',solve({'a':0,'b':''},['a','b']),True)\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-required-properties","generated_at":"2026-09-30T16:48:27.615698+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":"The validator treats a present falsey value as absent.","sha256":"1cf9934f8ad541a4659bb410f7ef06df47412ca2500a839d11f83032ce5396cc","title":"Required property presence is confused with truthiness · case 01","variant":1,"variant_policy":"The same explicitly authored fixtures repeat across all five numbered records; runtime N is unused. These records share one mechanism and must remain together in evaluation splits.","verified":true,"visibility":"public","verification":{"attempt":{"elapsed_ms":30.262,"exit_code":1,"observations":[{"actual":true,"check":"false value present","expected":true,"passed":true},{"actual":true,"check":"zero present","expected":true,"passed":true},{"actual":false,"check":"null present","expected":true,"passed":false},{"actual":false,"check":"missing key","expected":false,"passed":true},{"actual":true,"check":"empty requirements","expected":true,"passed":true},{"actual":true,"check":"mixed keys","expected":true,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"false value present\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"zero present\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"null present\", \"actual\": false, \"expected\": true, \"passed\": false}, {\"check\": \"missing key\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"empty requirements\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"mixed keys\", \"actual\": true, \"expected\": true, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":27.872,"exit_code":1,"observations":[{"actual":false,"check":"false value present","expected":true,"passed":false},{"actual":false,"check":"zero present","expected":true,"passed":false},{"actual":false,"check":"null present","expected":true,"passed":false},{"actual":false,"check":"missing key","expected":false,"passed":true},{"actual":true,"check":"empty requirements","expected":true,"passed":true},{"actual":false,"check":"mixed keys","expected":true,"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"false value present\", \"actual\": false, \"expected\": true, \"passed\": false}, {\"check\": \"zero present\", \"actual\": false, \"expected\": true, \"passed\": false}, {\"check\": \"null present\", \"actual\": false, \"expected\": true, \"passed\": false}, {\"check\": \"missing key\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"empty requirements\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"mixed keys\", \"actual\": false, \"expected\": true, \"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."}}