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Use ",[537,635,636],{},"maxLength"," and ",[537,639,640],{},"transform"," rather than enabling raw capture in production.",[643,644,646],"h3",{"id":645},"capture-everything","Capture everything",[648,649,654],"pre",{"className":650,"code":651,"language":652,"meta":653,"style":653},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","const ai = createAILogger(log, { toolInputs: true })\n","typescript","",[537,655,656],{"__ignoreMap":653},[657,658,661,665,669,673,677,680,683,686,690,693,697,700],"span",{"class":659,"line":660},"line",1,[657,662,664],{"class":663},"spNyl","const",[657,666,668],{"class":667},"sTEyZ"," ai ",[657,670,672],{"class":671},"sMK4o","=",[657,674,676],{"class":675},"s2Zo4"," createAILogger",[657,678,679],{"class":667},"(log",[657,681,682],{"class":671},",",[657,684,685],{"class":671}," {",[657,687,689],{"class":688},"swJcz"," toolInputs",[657,691,692],{"class":671},":",[657,694,696],{"class":695},"sfNiH"," true",[657,698,699],{"class":671}," }",[657,701,702],{"class":667},")\n",[643,704,706],{"id":705},"truncate-long-inputs","Truncate long inputs",[648,708,710],{"className":650,"code":709,"language":652,"meta":653,"style":653},"const ai = createAILogger(log, { toolInputs: { maxLength: 200 } })\n",[537,711,712],{"__ignoreMap":653},[657,713,714,716,718,720,722,724,726,728,730,732,734,737,739,743,745,747],{"class":659,"line":660},[657,715,664],{"class":663},[657,717,668],{"class":667},[657,719,672],{"class":671},[657,721,676],{"class":675},[657,723,679],{"class":667},[657,725,682],{"class":671},[657,727,685],{"class":671},[657,729,689],{"class":688},[657,731,692],{"class":671},[657,733,685],{"class":671},[657,735,736],{"class":688}," maxLength",[657,738,692],{"class":671},[657,740,742],{"class":741},"sbssI"," 200",[657,744,699],{"class":671},[657,746,699],{"class":671},[657,748,702],{"class":667},[643,750,752],{"id":751},"redact-sensitive-fields","Redact sensitive fields",[648,754,756],{"className":650,"code":755,"language":652,"meta":653,"style":653},"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",[537,757,758,775,785,799,827,875,884,890,896],{"__ignoreMap":653},[657,759,760,762,764,766,768,770,772],{"class":659,"line":660},[657,761,664],{"class":663},[657,763,668],{"class":667},[657,765,672],{"class":671},[657,767,676],{"class":675},[657,769,679],{"class":667},[657,771,682],{"class":671},[657,773,774],{"class":671}," {\n",[657,776,778,781,783],{"class":659,"line":777},2,[657,779,780],{"class":688},"  toolInputs",[657,782,692],{"class":671},[657,784,774],{"class":671},[657,786,788,791,793,796],{"class":659,"line":787},3,[657,789,790],{"class":688},"    maxLength",[657,792,692],{"class":671},[657,794,795],{"class":741}," 500",[657,797,798],{"class":671},",\n",[657,800,802,805,807,810,814,816,819,822,825],{"class":659,"line":801},4,[657,803,804],{"class":675},"    transform",[657,806,692],{"class":671},[657,808,809],{"class":671}," (",[657,811,813],{"class":812},"sHdIc","input",[657,815,682],{"class":671},[657,817,818],{"class":812}," toolName",[657,820,821],{"class":671},")",[657,823,824],{"class":663}," =>",[657,826,774],{"class":671},[657,828,830,834,836,839,842,845,849,852,855,858,860,863,865,867,870,872],{"class":659,"line":829},5,[657,831,833],{"class":832},"s7zQu","      if",[657,835,809],{"class":688},[657,837,838],{"class":667},"toolName",[657,840,841],{"class":671}," ===",[657,843,844],{"class":671}," '",[657,846,848],{"class":847},"sfazB","queryDB",[657,850,851],{"class":671},"'",[657,853,854],{"class":688},") ",[657,856,857],{"class":832},"return",[657,859,685],{"class":671},[657,861,862],{"class":688}," sql",[657,864,692],{"class":671},[657,866,844],{"class":671},[657,868,869],{"class":847},"***",[657,871,851],{"class":671},[657,873,874],{"class":671}," }\n",[657,876,878,881],{"class":659,"line":877},6,[657,879,880],{"class":832},"      return",[657,882,883],{"class":667}," input\n",[657,885,887],{"class":659,"line":886},7,[657,888,889],{"class":671},"    },\n",[657,891,893],{"class":659,"line":892},8,[657,894,895],{"class":671},"  },\n",[657,897,899,902],{"class":659,"line":898},9,[657,900,901],{"class":671},"}",[657,903,702],{"class":667},[542,905,906,917],{},[545,907,908],{},[548,909,910,913,915],{},[551,911,912],{},"Sub-option",[551,914,556],{},[551,916,562],{},[564,918,919,937],{},[548,920,921,925,930],{},[569,922,923],{},[537,924,636],{},[569,926,927],{},[537,928,929],{},"number",[569,931,932,933,936],{},"Truncate stringified inputs exceeding this character length (appends ",[537,934,935],{},"…",").",[548,938,939,943,948],{},[569,940,941],{},[537,942,640],{},[569,944,945],{},[537,946,947],{},"(input, toolName) => unknown",[569,949,950,951,953],{},"Custom transform applied before ",[537,952,636],{},". Use to redact fields or reshape data.",[534,955,956,957,959,960,962,963,966],{},"When ",[537,958,573],{}," is enabled, ",[537,961,621],{}," becomes an ",[537,964,965],{},"Array\u003C{ name, input }>"," instead of a plain string array.",[612,968,970],{"id":969},"cost-estimation","Cost Estimation",[534,972,973,974,976,977,980],{},"Pass a ",[537,975,593],{}," map to compute estimated dollar cost per call. The middleware multiplies token usage by the per-million rates and sets ",[537,978,979],{},"ai.estimatedCost"," on the wide event.",[648,982,984],{"className":650,"code":983,"language":652,"meta":653,"style":653},"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",[537,985,986,1002,1011,1046,1077,1081],{"__ignoreMap":653},[657,987,988,990,992,994,996,998,1000],{"class":659,"line":660},[657,989,664],{"class":663},[657,991,668],{"class":667},[657,993,672],{"class":671},[657,995,676],{"class":675},[657,997,679],{"class":667},[657,999,682],{"class":671},[657,1001,774],{"class":671},[657,1003,1004,1007,1009],{"class":659,"line":777},[657,1005,1006],{"class":688},"  cost",[657,1008,692],{"class":671},[657,1010,774],{"class":671},[657,1012,1013,1016,1019,1021,1023,1025,1028,1030,1033,1035,1038,1040,1043],{"class":659,"line":787},[657,1014,1015],{"class":671},"    '",[657,1017,1018],{"class":688},"claude-sonnet-4.6",[657,1020,851],{"class":671},[657,1022,692],{"class":671},[657,1024,685],{"class":671},[657,1026,1027],{"class":688}," input",[657,1029,692],{"class":671},[657,1031,1032],{"class":741}," 3",[657,1034,682],{"class":671},[657,1036,1037],{"class":688}," output",[657,1039,692],{"class":671},[657,1041,1042],{"class":741}," 15",[657,1044,1045],{"class":671}," },\n",[657,1047,1048,1050,1053,1055,1057,1059,1061,1063,1066,1068,1070,1072,1075],{"class":659,"line":801},[657,1049,1015],{"class":671},[657,1051,1052],{"class":688},"gpt-4o",[657,1054,851],{"class":671},[657,1056,692],{"class":671},[657,1058,685],{"class":671},[657,1060,1027],{"class":688},[657,1062,692],{"class":671},[657,1064,1065],{"class":741}," 2.5",[657,1067,682],{"class":671},[657,1069,1037],{"class":688},[657,1071,692],{"class":671},[657,1073,1074],{"class":741}," 10",[657,1076,1045],{"class":671},[657,1078,1079],{"class":659,"line":829},[657,1080,895],{"class":671},[657,1082,1083,1085],{"class":659,"line":877},[657,1084,901],{"class":671},[657,1086,702],{"class":667},[534,1088,1089,1090,1096],{},"Read the result from your handler with ",[1091,1092,1093],"a",{"href":338},[537,1094,1095],{},"ai.getEstimatedCost()",", which suits billing dashboards or warning users before expensive calls.",[1098,1099,1100,1101,1103],"tip",{},"Keep your ",[537,1102,593],{}," map in one file alongside model selection so renaming a model in production also updates pricing. Avoid hardcoding per-route maps.",[612,1105,1107],{"id":1106},"error-handling","Error Handling",[534,1109,1110],{},"If a model call fails, the middleware captures the error into the wide event before re-throwing:",[648,1112,1117],{"className":1113,"code":1114,"filename":1115,"language":1116,"meta":653,"style":653},"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",[537,1118,1119,1124,1139,1157,1177,1197,1217,1235,1240],{"__ignoreMap":653},[657,1120,1121],{"class":659,"line":660},[657,1122,1123],{"class":671},"{\n",[657,1125,1126,1129,1132,1135,1137],{"class":659,"line":777},[657,1127,1128],{"class":671},"  \"",[657,1130,1131],{"class":663},"ai",[657,1133,1134],{"class":671},"\"",[657,1136,692],{"class":671},[657,1138,774],{"class":671},[657,1140,1141,1144,1148,1150,1152,1155],{"class":659,"line":787},[657,1142,1143],{"class":671},"    \"",[657,1145,1147],{"class":1146},"sBMFI","calls",[657,1149,1134],{"class":671},[657,1151,692],{"class":671},[657,1153,1154],{"class":741}," 1",[657,1156,798],{"class":671},[657,1158,1159,1161,1164,1166,1168,1171,1173,1175],{"class":659,"line":801},[657,1160,1143],{"class":671},[657,1162,1163],{"class":1146},"model",[657,1165,1134],{"class":671},[657,1167,692],{"class":671},[657,1169,1170],{"class":671}," \"",[657,1172,1018],{"class":847},[657,1174,1134],{"class":671},[657,1176,798],{"class":671},[657,1178,1179,1181,1184,1186,1188,1190,1193,1195],{"class":659,"line":829},[657,1180,1143],{"class":671},[657,1182,1183],{"class":1146},"provider",[657,1185,1134],{"class":671},[657,1187,692],{"class":671},[657,1189,1170],{"class":671},[657,1191,1192],{"class":847},"anthropic",[657,1194,1134],{"class":671},[657,1196,798],{"class":671},[657,1198,1199,1201,1204,1206,1208,1210,1213,1215],{"class":659,"line":877},[657,1200,1143],{"class":671},[657,1202,1203],{"class":1146},"finishReason",[657,1205,1134],{"class":671},[657,1207,692],{"class":671},[657,1209,1170],{"class":671},[657,1211,1212],{"class":847},"error",[657,1214,1134],{"class":671},[657,1216,798],{"class":671},[657,1218,1219,1221,1223,1225,1227,1229,1232],{"class":659,"line":886},[657,1220,1143],{"class":671},[657,1222,1212],{"class":1146},[657,1224,1134],{"class":671},[657,1226,692],{"class":671},[657,1228,1170],{"class":671},[657,1230,1231],{"class":847},"API rate limit exceeded",[657,1233,1234],{"class":671},"\"\n",[657,1236,1237],{"class":659,"line":892},[657,1238,1239],{"class":671},"  }\n",[657,1241,1242],{"class":659,"line":898},[657,1243,1244],{"class":671},"}\n",[534,1246,1247,1248,1251],{},"Stream errors (e.g. content filter) are also captured from the stream's error chunks. Your error-handling code (",[537,1249,1250],{},"try\u002Fcatch",", route-level error handlers) keeps working as usual, since the middleware only observes.",[1253,1254,1255],"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":653,"searchDepth":777,"depth":777,"links":1257},[1258,1263,1264],{"id":614,"depth":777,"text":615,"children":1259},[1260,1261,1262],{"id":645,"depth":787,"text":646},{"id":705,"depth":787,"text":706},{"id":751,"depth":787,"text":752},{"id":969,"depth":777,"text":970},{"id":1106,"depth":777,"text":1107},"Configure tool input capture (with redaction and truncation), enable cost estimation per model, and handle errors during AI calls.","md",[1268,1271],{"label":128,"icon":140,"to":324,"color":1269,"variant":1270},"neutral","subtle",{"label":1272,"icon":330,"to":328,"color":1269,"variant":1270},"Usage Patterns",{},{"title":332,"icon":335},{"title":332,"description":1265},"LUd2gYCuWeLxyp9ow-0DzuVoq6g9N6Iz535T5ngJKdU",[1278,1280],{"title":327,"path":328,"stem":329,"description":1279,"icon":330,"children":-1},"streamText, generateText, multi-step agents, RAG, and multiple models — every common AI SDK pattern wired into evlog.",{"title":337,"path":338,"stem":339,"description":1281,"icon":340,"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.",1786793477107]