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Reach for ",[547,645,646],{},"maxLength"," and ",[547,649,650],{},"transform"," before raw capture in production.",[653,654,656],"h3",{"id":655},"capture-everything","Capture everything",[658,659,664],"pre",{"className":660,"code":661,"language":662,"meta":663,"style":663},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","const ai = createAILogger(log, { toolInputs: true })\n","typescript","",[547,665,666],{"__ignoreMap":663},[667,668,671,675,679,683,687,690,693,696,700,703,707,710],"span",{"class":669,"line":670},"line",1,[667,672,674],{"class":673},"spNyl","const",[667,676,678],{"class":677},"sTEyZ"," ai ",[667,680,682],{"class":681},"sMK4o","=",[667,684,686],{"class":685},"s2Zo4"," createAILogger",[667,688,689],{"class":677},"(log",[667,691,692],{"class":681},",",[667,694,695],{"class":681}," {",[667,697,699],{"class":698},"swJcz"," toolInputs",[667,701,702],{"class":681},":",[667,704,706],{"class":705},"sfNiH"," true",[667,708,709],{"class":681}," }",[667,711,712],{"class":677},")\n",[653,714,716],{"id":715},"truncate-long-inputs","Truncate long inputs",[658,718,720],{"className":660,"code":719,"language":662,"meta":663,"style":663},"const ai = createAILogger(log, { toolInputs: { maxLength: 200 } })\n",[547,721,722],{"__ignoreMap":663},[667,723,724,726,728,730,732,734,736,738,740,742,744,747,749,753,755,757],{"class":669,"line":670},[667,725,674],{"class":673},[667,727,678],{"class":677},[667,729,682],{"class":681},[667,731,686],{"class":685},[667,733,689],{"class":677},[667,735,692],{"class":681},[667,737,695],{"class":681},[667,739,699],{"class":698},[667,741,702],{"class":681},[667,743,695],{"class":681},[667,745,746],{"class":698}," maxLength",[667,748,702],{"class":681},[667,750,752],{"class":751},"sbssI"," 200",[667,754,709],{"class":681},[667,756,709],{"class":681},[667,758,712],{"class":677},[653,760,762],{"id":761},"redact-sensitive-fields","Redact sensitive fields",[658,764,766],{"className":660,"code":765,"language":662,"meta":663,"style":663},"const ai = createAILogger(log, {\n  toolInputs: {\n    maxLength: 500,\n    transform: (input, toolName) => {\n      if (toolName === 'queryDB') return { sql: '***' }\n      return input\n    },\n  },\n})\n",[547,767,768,785,795,809,837,885,894,900,906],{"__ignoreMap":663},[667,769,770,772,774,776,778,780,782],{"class":669,"line":670},[667,771,674],{"class":673},[667,773,678],{"class":677},[667,775,682],{"class":681},[667,777,686],{"class":685},[667,779,689],{"class":677},[667,781,692],{"class":681},[667,783,784],{"class":681}," {\n",[667,786,788,791,793],{"class":669,"line":787},2,[667,789,790],{"class":698},"  toolInputs",[667,792,702],{"class":681},[667,794,784],{"class":681},[667,796,798,801,803,806],{"class":669,"line":797},3,[667,799,800],{"class":698},"    maxLength",[667,802,702],{"class":681},[667,804,805],{"class":751}," 500",[667,807,808],{"class":681},",\n",[667,810,812,815,817,820,824,826,829,832,835],{"class":669,"line":811},4,[667,813,814],{"class":685},"    transform",[667,816,702],{"class":681},[667,818,819],{"class":681}," (",[667,821,823],{"class":822},"sHdIc","input",[667,825,692],{"class":681},[667,827,828],{"class":822}," toolName",[667,830,831],{"class":681},")",[667,833,834],{"class":673}," =>",[667,836,784],{"class":681},[667,838,840,844,846,849,852,855,859,862,865,868,870,873,875,877,880,882],{"class":669,"line":839},5,[667,841,843],{"class":842},"s7zQu","      if",[667,845,819],{"class":698},[667,847,848],{"class":677},"toolName",[667,850,851],{"class":681}," ===",[667,853,854],{"class":681}," '",[667,856,858],{"class":857},"sfazB","queryDB",[667,860,861],{"class":681},"'",[667,863,864],{"class":698},") ",[667,866,867],{"class":842},"return",[667,869,695],{"class":681},[667,871,872],{"class":698}," sql",[667,874,702],{"class":681},[667,876,854],{"class":681},[667,878,879],{"class":857},"***",[667,881,861],{"class":681},[667,883,884],{"class":681}," }\n",[667,886,888,891],{"class":669,"line":887},6,[667,889,890],{"class":842},"      return",[667,892,893],{"class":677}," input\n",[667,895,897],{"class":669,"line":896},7,[667,898,899],{"class":681},"    },\n",[667,901,903],{"class":669,"line":902},8,[667,904,905],{"class":681},"  },\n",[667,907,909,912],{"class":669,"line":908},9,[667,910,911],{"class":681},"}",[667,913,712],{"class":677},[552,915,916,927],{},[555,917,918],{},[558,919,920,923,925],{},[561,921,922],{},"Sub-option",[561,924,566],{},[561,926,572],{},[574,928,929,947],{},[558,930,931,935,940],{},[579,932,933],{},[547,934,646],{},[579,936,937],{},[547,938,939],{},"number",[579,941,942,943,946],{},"Truncate stringified inputs exceeding this character length (appends ",[547,944,945],{},"…",").",[558,948,949,953,958],{},[579,950,951],{},[547,952,650],{},[579,954,955],{},[547,956,957],{},"(input, toolName) => unknown",[579,959,960,961,963],{},"Custom transform applied before ",[547,962,646],{},". Use to redact fields or reshape data.",[544,965,966,967,969,970,972,973,976],{},"When ",[547,968,583],{}," is enabled, ",[547,971,631],{}," becomes an ",[547,974,975],{},"Array\u003C{ name, input }>"," instead of a plain string array.",[622,978,980],{"id":979},"cost-estimation","Cost Estimation",[544,982,983,984,986,987,990],{},"Pass a ",[547,985,603],{}," map to compute estimated dollar cost per call. The middleware multiplies token usage by the per-million rates and sets ",[547,988,989],{},"ai.estimatedCost"," on the wide event.",[658,992,994],{"className":660,"code":993,"language":662,"meta":663,"style":663},"const ai = createAILogger(log, {\n  cost: {\n    'claude-sonnet-4.6': { input: 3, output: 15 },\n    'gpt-4o': { input: 2.5, output: 10 },\n  },\n})\n",[547,995,996,1012,1021,1056,1087,1091],{"__ignoreMap":663},[667,997,998,1000,1002,1004,1006,1008,1010],{"class":669,"line":670},[667,999,674],{"class":673},[667,1001,678],{"class":677},[667,1003,682],{"class":681},[667,1005,686],{"class":685},[667,1007,689],{"class":677},[667,1009,692],{"class":681},[667,1011,784],{"class":681},[667,1013,1014,1017,1019],{"class":669,"line":787},[667,1015,1016],{"class":698},"  cost",[667,1018,702],{"class":681},[667,1020,784],{"class":681},[667,1022,1023,1026,1029,1031,1033,1035,1038,1040,1043,1045,1048,1050,1053],{"class":669,"line":797},[667,1024,1025],{"class":681},"    '",[667,1027,1028],{"class":698},"claude-sonnet-4.6",[667,1030,861],{"class":681},[667,1032,702],{"class":681},[667,1034,695],{"class":681},[667,1036,1037],{"class":698}," input",[667,1039,702],{"class":681},[667,1041,1042],{"class":751}," 3",[667,1044,692],{"class":681},[667,1046,1047],{"class":698}," output",[667,1049,702],{"class":681},[667,1051,1052],{"class":751}," 15",[667,1054,1055],{"class":681}," },\n",[667,1057,1058,1060,1063,1065,1067,1069,1071,1073,1076,1078,1080,1082,1085],{"class":669,"line":811},[667,1059,1025],{"class":681},[667,1061,1062],{"class":698},"gpt-4o",[667,1064,861],{"class":681},[667,1066,702],{"class":681},[667,1068,695],{"class":681},[667,1070,1037],{"class":698},[667,1072,702],{"class":681},[667,1074,1075],{"class":751}," 2.5",[667,1077,692],{"class":681},[667,1079,1047],{"class":698},[667,1081,702],{"class":681},[667,1083,1084],{"class":751}," 10",[667,1086,1055],{"class":681},[667,1088,1089],{"class":669,"line":839},[667,1090,905],{"class":681},[667,1092,1093,1095],{"class":669,"line":887},[667,1094,911],{"class":681},[667,1096,712],{"class":677},[544,1098,1099,1100,1106],{},"Read the result from your handler with ",[1101,1102,1103],"a",{"href":342},[547,1104,1105],{},"ai.getEstimatedCost()",", which suits billing dashboards or warning users before expensive calls.",[1108,1109,1110,1111,1113],"tip",{},"Keep your ",[547,1112,603],{}," map in one file alongside model selection so renaming a model in production also updates pricing. Per-route maps drift the moment two routes disagree about which model they call, so keep one.",[622,1115,1117],{"id":1116},"error-handling","Error Handling",[544,1119,1120],{},"If a model call fails, the middleware captures the error into the wide event before re-throwing:",[658,1122,1127],{"className":1123,"code":1124,"filename":1125,"language":1126,"meta":663,"style":663},"language-json shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","{\n  \"ai\": {\n    \"calls\": 1,\n    \"model\": \"claude-sonnet-4.6\",\n    \"provider\": \"anthropic\",\n    \"finishReason\": \"error\",\n    \"error\": \"API rate limit exceeded\"\n  }\n}\n","Wide Event","json",[547,1128,1129,1134,1149,1167,1187,1207,1227,1245,1250],{"__ignoreMap":663},[667,1130,1131],{"class":669,"line":670},[667,1132,1133],{"class":681},"{\n",[667,1135,1136,1139,1142,1145,1147],{"class":669,"line":787},[667,1137,1138],{"class":681},"  \"",[667,1140,1141],{"class":673},"ai",[667,1143,1144],{"class":681},"\"",[667,1146,702],{"class":681},[667,1148,784],{"class":681},[667,1150,1151,1154,1158,1160,1162,1165],{"class":669,"line":797},[667,1152,1153],{"class":681},"    \"",[667,1155,1157],{"class":1156},"sBMFI","calls",[667,1159,1144],{"class":681},[667,1161,702],{"class":681},[667,1163,1164],{"class":751}," 1",[667,1166,808],{"class":681},[667,1168,1169,1171,1174,1176,1178,1181,1183,1185],{"class":669,"line":811},[667,1170,1153],{"class":681},[667,1172,1173],{"class":1156},"model",[667,1175,1144],{"class":681},[667,1177,702],{"class":681},[667,1179,1180],{"class":681}," \"",[667,1182,1028],{"class":857},[667,1184,1144],{"class":681},[667,1186,808],{"class":681},[667,1188,1189,1191,1194,1196,1198,1200,1203,1205],{"class":669,"line":839},[667,1190,1153],{"class":681},[667,1192,1193],{"class":1156},"provider",[667,1195,1144],{"class":681},[667,1197,702],{"class":681},[667,1199,1180],{"class":681},[667,1201,1202],{"class":857},"anthropic",[667,1204,1144],{"class":681},[667,1206,808],{"class":681},[667,1208,1209,1211,1214,1216,1218,1220,1223,1225],{"class":669,"line":887},[667,1210,1153],{"class":681},[667,1212,1213],{"class":1156},"finishReason",[667,1215,1144],{"class":681},[667,1217,702],{"class":681},[667,1219,1180],{"class":681},[667,1221,1222],{"class":857},"error",[667,1224,1144],{"class":681},[667,1226,808],{"class":681},[667,1228,1229,1231,1233,1235,1237,1239,1242],{"class":669,"line":896},[667,1230,1153],{"class":681},[667,1232,1222],{"class":1156},[667,1234,1144],{"class":681},[667,1236,702],{"class":681},[667,1238,1180],{"class":681},[667,1240,1241],{"class":857},"API rate limit exceeded",[667,1243,1244],{"class":681},"\"\n",[667,1246,1247],{"class":669,"line":902},[667,1248,1249],{"class":681},"  }\n",[667,1251,1252],{"class":669,"line":908},[667,1253,1254],{"class":681},"}\n",[544,1256,1257,1258,1261],{},"Stream errors (e.g. content filter) are also captured from the stream's error chunks. Your error-handling code (",[547,1259,1260],{},"try\u002Fcatch",", route-level error handlers) keeps working as usual, since the middleware only observes.",[1263,1264,1265],"style",{},"html pre.shiki code .spNyl, html code.shiki .spNyl{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .sTEyZ, html code.shiki .sTEyZ{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .sMK4o, html code.shiki .sMK4o{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .s2Zo4, html code.shiki .s2Zo4{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .swJcz, html code.shiki .swJcz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html pre.shiki code .sfNiH, html code.shiki .sfNiH{--shiki-light:#FF5370;--shiki-default:#FF9CAC;--shiki-dark:#FF9CAC}html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html.light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html pre.shiki code .sbssI, html code.shiki .sbssI{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}html pre.shiki code .sHdIc, html code.shiki .sHdIc{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#EEFFFF;--shiki-default-font-style:italic;--shiki-dark:#BABED8;--shiki-dark-font-style:italic}html pre.shiki code .s7zQu, html code.shiki .s7zQu{--shiki-light:#39ADB5;--shiki-light-font-style:italic;--shiki-default:#89DDFF;--shiki-default-font-style:italic;--shiki-dark:#89DDFF;--shiki-dark-font-style:italic}html pre.shiki code .sfazB, html code.shiki .sfazB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}html pre.shiki code .sBMFI, html code.shiki .sBMFI{--shiki-light:#E2931D;--shiki-default:#FFCB6B;--shiki-dark:#FFCB6B}",{"title":663,"searchDepth":787,"depth":787,"links":1267},[1268,1273,1274],{"id":624,"depth":787,"text":625,"children":1269},[1270,1271,1272],{"id":655,"depth":797,"text":656},{"id":715,"depth":797,"text":716},{"id":761,"depth":797,"text":762},{"id":979,"depth":787,"text":980},{"id":1116,"depth":787,"text":1117},"Configure tool input capture (with redaction and truncation), enable cost estimation per model, and handle errors during AI calls.","md",[1278,1281],{"label":36,"icon":39,"to":328,"color":1279,"variant":1280},"neutral","subtle",{"label":1282,"icon":334,"to":332,"color":1279,"variant":1280},"Usage Patterns",{},{"title":336,"icon":339},{"title":336,"description":1275},"lkJ9lfJfAdZ7-AxVzfHwoaTGWZFD31OFdRFkIRfpxS4",[1288,1290],{"title":331,"path":332,"stem":333,"description":1289,"icon":334,"children":-1},"streamText, generateText, multi-step agents, RAG, and multiple models — every common AI SDK pattern wired into evlog.",{"title":341,"path":342,"stem":343,"description":1291,"icon":344,"children":-1},"Read AI metadata from your handler — persist it, surface it to end-users, bill against it, or stream incremental progress to the client.",1786817428358]