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Use ",[534,632,633],{},"maxLength"," and ",[534,636,637],{},"transform"," rather than enabling raw capture in production.",[640,641,643],"h3",{"id":642},"capture-everything","Capture everything",[645,646,651],"pre",{"className":647,"code":648,"language":649,"meta":650,"style":650},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","const ai = createAILogger(log, { toolInputs: true })\n","typescript","",[534,652,653],{"__ignoreMap":650},[654,655,658,662,666,670,674,677,680,683,687,690,694,697],"span",{"class":656,"line":657},"line",1,[654,659,661],{"class":660},"spNyl","const",[654,663,665],{"class":664},"sTEyZ"," ai ",[654,667,669],{"class":668},"sMK4o","=",[654,671,673],{"class":672},"s2Zo4"," createAILogger",[654,675,676],{"class":664},"(log",[654,678,679],{"class":668},",",[654,681,682],{"class":668}," {",[654,684,686],{"class":685},"swJcz"," toolInputs",[654,688,689],{"class":668},":",[654,691,693],{"class":692},"sfNiH"," true",[654,695,696],{"class":668}," }",[654,698,699],{"class":664},")\n",[640,701,703],{"id":702},"truncate-long-inputs","Truncate long inputs",[645,705,707],{"className":647,"code":706,"language":649,"meta":650,"style":650},"const ai = createAILogger(log, { toolInputs: { maxLength: 200 } })\n",[534,708,709],{"__ignoreMap":650},[654,710,711,713,715,717,719,721,723,725,727,729,731,734,736,740,742,744],{"class":656,"line":657},[654,712,661],{"class":660},[654,714,665],{"class":664},[654,716,669],{"class":668},[654,718,673],{"class":672},[654,720,676],{"class":664},[654,722,679],{"class":668},[654,724,682],{"class":668},[654,726,686],{"class":685},[654,728,689],{"class":668},[654,730,682],{"class":668},[654,732,733],{"class":685}," maxLength",[654,735,689],{"class":668},[654,737,739],{"class":738},"sbssI"," 200",[654,741,696],{"class":668},[654,743,696],{"class":668},[654,745,699],{"class":664},[640,747,749],{"id":748},"redact-sensitive-fields","Redact sensitive fields",[645,751,753],{"className":647,"code":752,"language":649,"meta":650,"style":650},"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",[534,754,755,772,782,796,824,872,881,887,893],{"__ignoreMap":650},[654,756,757,759,761,763,765,767,769],{"class":656,"line":657},[654,758,661],{"class":660},[654,760,665],{"class":664},[654,762,669],{"class":668},[654,764,673],{"class":672},[654,766,676],{"class":664},[654,768,679],{"class":668},[654,770,771],{"class":668}," {\n",[654,773,775,778,780],{"class":656,"line":774},2,[654,776,777],{"class":685},"  toolInputs",[654,779,689],{"class":668},[654,781,771],{"class":668},[654,783,785,788,790,793],{"class":656,"line":784},3,[654,786,787],{"class":685},"    maxLength",[654,789,689],{"class":668},[654,791,792],{"class":738}," 500",[654,794,795],{"class":668},",\n",[654,797,799,802,804,807,811,813,816,819,822],{"class":656,"line":798},4,[654,800,801],{"class":672},"    transform",[654,803,689],{"class":668},[654,805,806],{"class":668}," (",[654,808,810],{"class":809},"sHdIc","input",[654,812,679],{"class":668},[654,814,815],{"class":809}," toolName",[654,817,818],{"class":668},")",[654,820,821],{"class":660}," =>",[654,823,771],{"class":668},[654,825,827,831,833,836,839,842,846,849,852,855,857,860,862,864,867,869],{"class":656,"line":826},5,[654,828,830],{"class":829},"s7zQu","      if",[654,832,806],{"class":685},[654,834,835],{"class":664},"toolName",[654,837,838],{"class":668}," ===",[654,840,841],{"class":668}," '",[654,843,845],{"class":844},"sfazB","queryDB",[654,847,848],{"class":668},"'",[654,850,851],{"class":685},") ",[654,853,854],{"class":829},"return",[654,856,682],{"class":668},[654,858,859],{"class":685}," sql",[654,861,689],{"class":668},[654,863,841],{"class":668},[654,865,866],{"class":844},"***",[654,868,848],{"class":668},[654,870,871],{"class":668}," }\n",[654,873,875,878],{"class":656,"line":874},6,[654,876,877],{"class":829},"      return",[654,879,880],{"class":664}," input\n",[654,882,884],{"class":656,"line":883},7,[654,885,886],{"class":668},"    },\n",[654,888,890],{"class":656,"line":889},8,[654,891,892],{"class":668},"  },\n",[654,894,896,899],{"class":656,"line":895},9,[654,897,898],{"class":668},"}",[654,900,699],{"class":664},[539,902,903,914],{},[542,904,905],{},[545,906,907,910,912],{},[548,908,909],{},"Sub-option",[548,911,553],{},[548,913,559],{},[561,915,916,934],{},[545,917,918,922,927],{},[566,919,920],{},[534,921,633],{},[566,923,924],{},[534,925,926],{},"number",[566,928,929,930,933],{},"Truncate stringified inputs exceeding this character length (appends ",[534,931,932],{},"…",").",[545,935,936,940,945],{},[566,937,938],{},[534,939,637],{},[566,941,942],{},[534,943,944],{},"(input, toolName) => unknown",[566,946,947,948,950],{},"Custom transform applied before ",[534,949,633],{},". Use to redact fields or reshape data.",[531,952,953,954,956,957,959,960,963],{},"When ",[534,955,570],{}," is enabled, ",[534,958,618],{}," becomes an ",[534,961,962],{},"Array\u003C{ name, input }>"," instead of a plain string array.",[609,965,967],{"id":966},"cost-estimation","Cost Estimation",[531,969,970,971,973,974,977],{},"Pass a ",[534,972,590],{}," map to compute estimated dollar cost per call. The middleware multiplies token usage by the per-million rates and sets ",[534,975,976],{},"ai.estimatedCost"," on the wide event.",[645,979,981],{"className":647,"code":980,"language":649,"meta":650,"style":650},"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",[534,982,983,999,1008,1043,1074,1078],{"__ignoreMap":650},[654,984,985,987,989,991,993,995,997],{"class":656,"line":657},[654,986,661],{"class":660},[654,988,665],{"class":664},[654,990,669],{"class":668},[654,992,673],{"class":672},[654,994,676],{"class":664},[654,996,679],{"class":668},[654,998,771],{"class":668},[654,1000,1001,1004,1006],{"class":656,"line":774},[654,1002,1003],{"class":685},"  cost",[654,1005,689],{"class":668},[654,1007,771],{"class":668},[654,1009,1010,1013,1016,1018,1020,1022,1025,1027,1030,1032,1035,1037,1040],{"class":656,"line":784},[654,1011,1012],{"class":668},"    '",[654,1014,1015],{"class":685},"claude-sonnet-4.6",[654,1017,848],{"class":668},[654,1019,689],{"class":668},[654,1021,682],{"class":668},[654,1023,1024],{"class":685}," input",[654,1026,689],{"class":668},[654,1028,1029],{"class":738}," 3",[654,1031,679],{"class":668},[654,1033,1034],{"class":685}," output",[654,1036,689],{"class":668},[654,1038,1039],{"class":738}," 15",[654,1041,1042],{"class":668}," },\n",[654,1044,1045,1047,1050,1052,1054,1056,1058,1060,1063,1065,1067,1069,1072],{"class":656,"line":798},[654,1046,1012],{"class":668},[654,1048,1049],{"class":685},"gpt-4o",[654,1051,848],{"class":668},[654,1053,689],{"class":668},[654,1055,682],{"class":668},[654,1057,1024],{"class":685},[654,1059,689],{"class":668},[654,1061,1062],{"class":738}," 2.5",[654,1064,679],{"class":668},[654,1066,1034],{"class":685},[654,1068,689],{"class":668},[654,1070,1071],{"class":738}," 10",[654,1073,1042],{"class":668},[654,1075,1076],{"class":656,"line":826},[654,1077,892],{"class":668},[654,1079,1080,1082],{"class":656,"line":874},[654,1081,898],{"class":668},[654,1083,699],{"class":664},[531,1085,1086,1087,1093],{},"Read the result from your handler with ",[1088,1089,1090],"a",{"href":342},[534,1091,1092],{},"ai.getEstimatedCost()"," — useful for billing dashboards or warning users before expensive calls.",[1095,1096,1097,1098,1100],"tip",{},"Keep your ",[534,1099,590],{}," map in one file alongside model selection so renaming a model in production also updates pricing. Avoid hardcoding per-route maps.",[609,1102,1104],{"id":1103},"error-handling","Error Handling",[531,1106,1107],{},"If a model call fails, the middleware captures the error into the wide event before re-throwing:",[645,1109,1114],{"className":1110,"code":1111,"filename":1112,"language":1113,"meta":650,"style":650},"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",[534,1115,1116,1121,1136,1154,1174,1194,1214,1232,1237],{"__ignoreMap":650},[654,1117,1118],{"class":656,"line":657},[654,1119,1120],{"class":668},"{\n",[654,1122,1123,1126,1129,1132,1134],{"class":656,"line":774},[654,1124,1125],{"class":668},"  \"",[654,1127,1128],{"class":660},"ai",[654,1130,1131],{"class":668},"\"",[654,1133,689],{"class":668},[654,1135,771],{"class":668},[654,1137,1138,1141,1145,1147,1149,1152],{"class":656,"line":784},[654,1139,1140],{"class":668},"    \"",[654,1142,1144],{"class":1143},"sBMFI","calls",[654,1146,1131],{"class":668},[654,1148,689],{"class":668},[654,1150,1151],{"class":738}," 1",[654,1153,795],{"class":668},[654,1155,1156,1158,1161,1163,1165,1168,1170,1172],{"class":656,"line":798},[654,1157,1140],{"class":668},[654,1159,1160],{"class":1143},"model",[654,1162,1131],{"class":668},[654,1164,689],{"class":668},[654,1166,1167],{"class":668}," \"",[654,1169,1015],{"class":844},[654,1171,1131],{"class":668},[654,1173,795],{"class":668},[654,1175,1176,1178,1181,1183,1185,1187,1190,1192],{"class":656,"line":826},[654,1177,1140],{"class":668},[654,1179,1180],{"class":1143},"provider",[654,1182,1131],{"class":668},[654,1184,689],{"class":668},[654,1186,1167],{"class":668},[654,1188,1189],{"class":844},"anthropic",[654,1191,1131],{"class":668},[654,1193,795],{"class":668},[654,1195,1196,1198,1201,1203,1205,1207,1210,1212],{"class":656,"line":874},[654,1197,1140],{"class":668},[654,1199,1200],{"class":1143},"finishReason",[654,1202,1131],{"class":668},[654,1204,689],{"class":668},[654,1206,1167],{"class":668},[654,1208,1209],{"class":844},"error",[654,1211,1131],{"class":668},[654,1213,795],{"class":668},[654,1215,1216,1218,1220,1222,1224,1226,1229],{"class":656,"line":883},[654,1217,1140],{"class":668},[654,1219,1209],{"class":1143},[654,1221,1131],{"class":668},[654,1223,689],{"class":668},[654,1225,1167],{"class":668},[654,1227,1228],{"class":844},"API rate limit exceeded",[654,1230,1231],{"class":668},"\"\n",[654,1233,1234],{"class":656,"line":889},[654,1235,1236],{"class":668},"  }\n",[654,1238,1239],{"class":656,"line":895},[654,1240,1241],{"class":668},"}\n",[531,1243,1244,1245,1248],{},"Stream errors (e.g. content filter) are also captured from the stream's error chunks. Your error-handling code (",[534,1246,1247],{},"try\u002Fcatch",", route-level error handlers) keeps working as usual — the middleware only observes.",[1250,1251,1252],"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":650,"searchDepth":774,"depth":774,"links":1254},[1255,1260,1261],{"id":611,"depth":774,"text":612,"children":1256},[1257,1258,1259],{"id":642,"depth":784,"text":643},{"id":702,"depth":784,"text":703},{"id":748,"depth":784,"text":749},{"id":966,"depth":774,"text":967},{"id":1103,"depth":774,"text":1104},"Configure tool input capture (with redaction and truncation), enable cost estimation per model, and handle errors during AI calls.","md",[1265,1268],{"label":36,"icon":39,"to":328,"color":1266,"variant":1267},"neutral","subtle",{"label":1269,"icon":334,"to":332,"color":1266,"variant":1267},"Usage Patterns",{},{"title":336,"icon":339},{"title":336,"description":1262},"k7Xm9_TcThZFVYxRgR4ikKafIXVxXYfDNbM3H99Fklk",[1275,1277],{"title":331,"path":332,"stem":333,"description":1276,"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":1278,"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.",1785671130857]