{"abstract":"Property name rule checks values instead of keys.","category":"Tool call schema validation","checks":6,"contract":"Every property name must begin with the supplied prefix; an empty object is valid.","contract_signature":"obj, prefix","evaluation_group":"w3-schema-property-name-pattern","failed_approach":"Checking at least one key misses a disallowed sibling key.","family":"w3-tool-call-schema-validation-property-name-pattern","id":"FA-99836","implementations":{"attempt":{"sha256":"538a32af15f0418944a618f9f3b7d0454a5a02927383c0d07ba521cce76d285c","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(obj, prefix):\n    return any(k.startswith(prefix) for k in obj)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('all matching',solve({'arg_a':1,'arg_b':2},'arg_'),True)\ncheck('bad name with matching value',solve({'other':'arg_value'},'arg_'),False)\ncheck('one bad sibling',solve({'arg_a':1,'x':2},'arg_'),False)\ncheck('empty object',solve({},'arg_'),True)\ncheck('empty prefix',solve({'x':1},''),True)\ncheck('exact prefix key',solve({'arg_':None},'arg_'),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":"6cfc076481a799e43987222a48c358b1220284fcd00d80d18f66a83442749dcd","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(obj, prefix):\n    return all(str(v).startswith(prefix) for v in obj.values())\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('all matching',solve({'arg_a':1,'arg_b':2},'arg_'),True)\ncheck('bad name with matching value',solve({'other':'arg_value'},'arg_'),False)\ncheck('one bad sibling',solve({'arg_a':1,'x':2},'arg_'),False)\ncheck('empty object',solve({},'arg_'),True)\ncheck('empty prefix',solve({'x':1},''),True)\ncheck('exact prefix key',solve({'arg_':None},'arg_'),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-property-name-pattern","generated_at":"2026-09-30T16:48:28.554565+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 name constraint is applied to property values.","sha256":"4901c67ee99dd1f2000518b636a6805c862bbb22d51c62fe528a610c9e70d1a9","title":"Property name rule checks values instead of keys · 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":27.994,"exit_code":1,"observations":[{"actual":true,"check":"all matching","expected":true,"passed":true},{"actual":false,"check":"bad name with matching value","expected":false,"passed":true},{"actual":true,"check":"one bad sibling","expected":false,"passed":false},{"actual":false,"check":"empty object","expected":true,"passed":false},{"actual":true,"check":"empty prefix","expected":true,"passed":true},{"actual":true,"check":"exact prefix key","expected":true,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"all matching\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"bad name with matching value\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"one bad sibling\", \"actual\": true, \"expected\": false, \"passed\": false}, {\"check\": \"empty object\", \"actual\": false, \"expected\": true, \"passed\": false}, {\"check\": \"empty prefix\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"exact prefix key\", \"actual\": true, \"expected\": true, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":25.439,"exit_code":1,"observations":[{"actual":false,"check":"all matching","expected":true,"passed":false},{"actual":true,"check":"bad name with matching value","expected":false,"passed":false},{"actual":false,"check":"one bad sibling","expected":false,"passed":true},{"actual":true,"check":"empty object","expected":true,"passed":true},{"actual":true,"check":"empty prefix","expected":true,"passed":true},{"actual":false,"check":"exact prefix key","expected":true,"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"all matching\", \"actual\": false, \"expected\": true, \"passed\": false}, {\"check\": \"bad name with matching value\", \"actual\": true, \"expected\": false, \"passed\": false}, {\"check\": \"one bad sibling\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"empty object\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"empty prefix\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"exact prefix key\", \"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."}}