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Use ",[543,641,642],{},"maxLength"," and ",[543,645,646],{},"transform"," rather than enabling raw capture in production.",[649,650,652],"h3",{"id":651},"capture-everything","Capture everything",[654,655,660],"pre",{"className":656,"code":657,"language":658,"meta":659,"style":659},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","const ai = createAILogger(log, { toolInputs: true })\n","typescript","",[543,661,662],{"__ignoreMap":659},[663,664,667,671,675,679,683,686,689,692,696,699,703,706],"span",{"class":665,"line":666},"line",1,[663,668,670],{"class":669},"spNyl","const",[663,672,674],{"class":673},"sTEyZ"," ai ",[663,676,678],{"class":677},"sMK4o","=",[663,680,682],{"class":681},"s2Zo4"," createAILogger",[663,684,685],{"class":673},"(log",[663,687,688],{"class":677},",",[663,690,691],{"class":677}," {",[663,693,695],{"class":694},"swJcz"," toolInputs",[663,697,698],{"class":677},":",[663,700,702],{"class":701},"sfNiH"," true",[663,704,705],{"class":677}," }",[663,707,708],{"class":673},")\n",[649,710,712],{"id":711},"truncate-long-inputs","Truncate long inputs",[654,714,716],{"className":656,"code":715,"language":658,"meta":659,"style":659},"const ai = createAILogger(log, { toolInputs: { maxLength: 200 } })\n",[543,717,718],{"__ignoreMap":659},[663,719,720,722,724,726,728,730,732,734,736,738,740,743,745,749,751,753],{"class":665,"line":666},[663,721,670],{"class":669},[663,723,674],{"class":673},[663,725,678],{"class":677},[663,727,682],{"class":681},[663,729,685],{"class":673},[663,731,688],{"class":677},[663,733,691],{"class":677},[663,735,695],{"class":694},[663,737,698],{"class":677},[663,739,691],{"class":677},[663,741,742],{"class":694}," maxLength",[663,744,698],{"class":677},[663,746,748],{"class":747},"sbssI"," 200",[663,750,705],{"class":677},[663,752,705],{"class":677},[663,754,708],{"class":673},[649,756,758],{"id":757},"redact-sensitive-fields","Redact sensitive fields",[654,760,762],{"className":656,"code":761,"language":658,"meta":659,"style":659},"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",[543,763,764,781,791,805,833,881,890,896,902],{"__ignoreMap":659},[663,765,766,768,770,772,774,776,778],{"class":665,"line":666},[663,767,670],{"class":669},[663,769,674],{"class":673},[663,771,678],{"class":677},[663,773,682],{"class":681},[663,775,685],{"class":673},[663,777,688],{"class":677},[663,779,780],{"class":677}," {\n",[663,782,784,787,789],{"class":665,"line":783},2,[663,785,786],{"class":694},"  toolInputs",[663,788,698],{"class":677},[663,790,780],{"class":677},[663,792,794,797,799,802],{"class":665,"line":793},3,[663,795,796],{"class":694},"    maxLength",[663,798,698],{"class":677},[663,800,801],{"class":747}," 500",[663,803,804],{"class":677},",\n",[663,806,808,811,813,816,820,822,825,828,831],{"class":665,"line":807},4,[663,809,810],{"class":681},"    transform",[663,812,698],{"class":677},[663,814,815],{"class":677}," (",[663,817,819],{"class":818},"sHdIc","input",[663,821,688],{"class":677},[663,823,824],{"class":818}," toolName",[663,826,827],{"class":677},")",[663,829,830],{"class":669}," =>",[663,832,780],{"class":677},[663,834,836,840,842,845,848,851,855,858,861,864,866,869,871,873,876,878],{"class":665,"line":835},5,[663,837,839],{"class":838},"s7zQu","      if",[663,841,815],{"class":694},[663,843,844],{"class":673},"toolName",[663,846,847],{"class":677}," ===",[663,849,850],{"class":677}," '",[663,852,854],{"class":853},"sfazB","queryDB",[663,856,857],{"class":677},"'",[663,859,860],{"class":694},") ",[663,862,863],{"class":838},"return",[663,865,691],{"class":677},[663,867,868],{"class":694}," sql",[663,870,698],{"class":677},[663,872,850],{"class":677},[663,874,875],{"class":853},"***",[663,877,857],{"class":677},[663,879,880],{"class":677}," }\n",[663,882,884,887],{"class":665,"line":883},6,[663,885,886],{"class":838},"      return",[663,888,889],{"class":673}," input\n",[663,891,893],{"class":665,"line":892},7,[663,894,895],{"class":677},"    },\n",[663,897,899],{"class":665,"line":898},8,[663,900,901],{"class":677},"  },\n",[663,903,905,908],{"class":665,"line":904},9,[663,906,907],{"class":677},"}",[663,909,708],{"class":673},[548,911,912,923],{},[551,913,914],{},[554,915,916,919,921],{},[557,917,918],{},"Sub-option",[557,920,562],{},[557,922,568],{},[570,924,925,943],{},[554,926,927,931,936],{},[575,928,929],{},[543,930,642],{},[575,932,933],{},[543,934,935],{},"number",[575,937,938,939,942],{},"Truncate stringified inputs exceeding this character length (appends ",[543,940,941],{},"…",").",[554,944,945,949,954],{},[575,946,947],{},[543,948,646],{},[575,950,951],{},[543,952,953],{},"(input, toolName) => unknown",[575,955,956,957,959],{},"Custom transform applied before ",[543,958,642],{},". Use to redact fields or reshape data.",[540,961,962,963,965,966,968,969,972],{},"When ",[543,964,579],{}," is enabled, ",[543,967,627],{}," becomes an ",[543,970,971],{},"Array\u003C{ name, input }>"," instead of a plain string array.",[618,974,976],{"id":975},"cost-estimation","Cost Estimation",[540,978,979,980,982,983,986],{},"Pass a ",[543,981,599],{}," map to compute estimated dollar cost per call. The middleware multiplies token usage by the per-million rates and sets ",[543,984,985],{},"ai.estimatedCost"," on the wide event.",[654,988,990],{"className":656,"code":989,"language":658,"meta":659,"style":659},"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",[543,991,992,1008,1017,1052,1083,1087],{"__ignoreMap":659},[663,993,994,996,998,1000,1002,1004,1006],{"class":665,"line":666},[663,995,670],{"class":669},[663,997,674],{"class":673},[663,999,678],{"class":677},[663,1001,682],{"class":681},[663,1003,685],{"class":673},[663,1005,688],{"class":677},[663,1007,780],{"class":677},[663,1009,1010,1013,1015],{"class":665,"line":783},[663,1011,1012],{"class":694},"  cost",[663,1014,698],{"class":677},[663,1016,780],{"class":677},[663,1018,1019,1022,1025,1027,1029,1031,1034,1036,1039,1041,1044,1046,1049],{"class":665,"line":793},[663,1020,1021],{"class":677},"    '",[663,1023,1024],{"class":694},"claude-sonnet-4.6",[663,1026,857],{"class":677},[663,1028,698],{"class":677},[663,1030,691],{"class":677},[663,1032,1033],{"class":694}," input",[663,1035,698],{"class":677},[663,1037,1038],{"class":747}," 3",[663,1040,688],{"class":677},[663,1042,1043],{"class":694}," output",[663,1045,698],{"class":677},[663,1047,1048],{"class":747}," 15",[663,1050,1051],{"class":677}," },\n",[663,1053,1054,1056,1059,1061,1063,1065,1067,1069,1072,1074,1076,1078,1081],{"class":665,"line":807},[663,1055,1021],{"class":677},[663,1057,1058],{"class":694},"gpt-4o",[663,1060,857],{"class":677},[663,1062,698],{"class":677},[663,1064,691],{"class":677},[663,1066,1033],{"class":694},[663,1068,698],{"class":677},[663,1070,1071],{"class":747}," 2.5",[663,1073,688],{"class":677},[663,1075,1043],{"class":694},[663,1077,698],{"class":677},[663,1079,1080],{"class":747}," 10",[663,1082,1051],{"class":677},[663,1084,1085],{"class":665,"line":835},[663,1086,901],{"class":677},[663,1088,1089,1091],{"class":665,"line":883},[663,1090,907],{"class":677},[663,1092,708],{"class":673},[540,1094,1095,1096,1102],{},"Read the result from your handler with ",[1097,1098,1099],"a",{"href":342},[543,1100,1101],{},"ai.getEstimatedCost()"," — useful for billing dashboards or warning users before expensive calls.",[1104,1105,1106,1107,1109],"tip",{},"Keep your ",[543,1108,599],{}," map in one file alongside model selection so renaming a model in production also updates pricing. Avoid hardcoding per-route maps.",[618,1111,1113],{"id":1112},"error-handling","Error Handling",[540,1115,1116],{},"If a model call fails, the middleware captures the error into the wide event before re-throwing:",[654,1118,1123],{"className":1119,"code":1120,"filename":1121,"language":1122,"meta":659,"style":659},"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",[543,1124,1125,1130,1145,1163,1183,1203,1223,1241,1246],{"__ignoreMap":659},[663,1126,1127],{"class":665,"line":666},[663,1128,1129],{"class":677},"{\n",[663,1131,1132,1135,1138,1141,1143],{"class":665,"line":783},[663,1133,1134],{"class":677},"  \"",[663,1136,1137],{"class":669},"ai",[663,1139,1140],{"class":677},"\"",[663,1142,698],{"class":677},[663,1144,780],{"class":677},[663,1146,1147,1150,1154,1156,1158,1161],{"class":665,"line":793},[663,1148,1149],{"class":677},"    \"",[663,1151,1153],{"class":1152},"sBMFI","calls",[663,1155,1140],{"class":677},[663,1157,698],{"class":677},[663,1159,1160],{"class":747}," 1",[663,1162,804],{"class":677},[663,1164,1165,1167,1170,1172,1174,1177,1179,1181],{"class":665,"line":807},[663,1166,1149],{"class":677},[663,1168,1169],{"class":1152},"model",[663,1171,1140],{"class":677},[663,1173,698],{"class":677},[663,1175,1176],{"class":677}," \"",[663,1178,1024],{"class":853},[663,1180,1140],{"class":677},[663,1182,804],{"class":677},[663,1184,1185,1187,1190,1192,1194,1196,1199,1201],{"class":665,"line":835},[663,1186,1149],{"class":677},[663,1188,1189],{"class":1152},"provider",[663,1191,1140],{"class":677},[663,1193,698],{"class":677},[663,1195,1176],{"class":677},[663,1197,1198],{"class":853},"anthropic",[663,1200,1140],{"class":677},[663,1202,804],{"class":677},[663,1204,1205,1207,1210,1212,1214,1216,1219,1221],{"class":665,"line":883},[663,1206,1149],{"class":677},[663,1208,1209],{"class":1152},"finishReason",[663,1211,1140],{"class":677},[663,1213,698],{"class":677},[663,1215,1176],{"class":677},[663,1217,1218],{"class":853},"error",[663,1220,1140],{"class":677},[663,1222,804],{"class":677},[663,1224,1225,1227,1229,1231,1233,1235,1238],{"class":665,"line":892},[663,1226,1149],{"class":677},[663,1228,1218],{"class":1152},[663,1230,1140],{"class":677},[663,1232,698],{"class":677},[663,1234,1176],{"class":677},[663,1236,1237],{"class":853},"API rate limit exceeded",[663,1239,1240],{"class":677},"\"\n",[663,1242,1243],{"class":665,"line":898},[663,1244,1245],{"class":677},"  }\n",[663,1247,1248],{"class":665,"line":904},[663,1249,1250],{"class":677},"}\n",[540,1252,1253,1254,1257],{},"Stream errors (e.g. content filter) are also captured from the stream's error chunks. Your error-handling code (",[543,1255,1256],{},"try\u002Fcatch",", route-level error handlers) keeps working as usual — the middleware only observes.",[1259,1260,1261],"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":659,"searchDepth":783,"depth":783,"links":1263},[1264,1269,1270],{"id":620,"depth":783,"text":621,"children":1265},[1266,1267,1268],{"id":651,"depth":793,"text":652},{"id":711,"depth":793,"text":712},{"id":757,"depth":793,"text":758},{"id":975,"depth":783,"text":976},{"id":1112,"depth":783,"text":1113},"Configure tool input capture (with redaction and truncation), enable cost estimation per model, and handle errors during AI calls.","md",[1274,1277],{"label":36,"icon":39,"to":328,"color":1275,"variant":1276},"neutral","subtle",{"label":1278,"icon":334,"to":332,"color":1275,"variant":1276},"Usage Patterns",{},{"title":336,"icon":339},{"title":336,"description":1271},"k7Xm9_TcThZFVYxRgR4ikKafIXVxXYfDNbM3H99Fklk",[1284,1286],{"title":331,"path":332,"stem":333,"description":1285,"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":1287,"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.",1786743655825]