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Use ",[538,636,637],{},"maxLength"," and ",[538,640,641],{},"transform"," rather than enabling raw capture in production.",[644,645,647],"h3",{"id":646},"capture-everything","Capture everything",[649,650,655],"pre",{"className":651,"code":652,"language":653,"meta":654,"style":654},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","const ai = createAILogger(log, { toolInputs: true })\n","typescript","",[538,656,657],{"__ignoreMap":654},[658,659,662,666,670,674,678,681,684,687,691,694,698,701],"span",{"class":660,"line":661},"line",1,[658,663,665],{"class":664},"spNyl","const",[658,667,669],{"class":668},"sTEyZ"," ai ",[658,671,673],{"class":672},"sMK4o","=",[658,675,677],{"class":676},"s2Zo4"," createAILogger",[658,679,680],{"class":668},"(log",[658,682,683],{"class":672},",",[658,685,686],{"class":672}," {",[658,688,690],{"class":689},"swJcz"," toolInputs",[658,692,693],{"class":672},":",[658,695,697],{"class":696},"sfNiH"," true",[658,699,700],{"class":672}," }",[658,702,703],{"class":668},")\n",[644,705,707],{"id":706},"truncate-long-inputs","Truncate long inputs",[649,709,711],{"className":651,"code":710,"language":653,"meta":654,"style":654},"const ai = createAILogger(log, { toolInputs: { maxLength: 200 } })\n",[538,712,713],{"__ignoreMap":654},[658,714,715,717,719,721,723,725,727,729,731,733,735,738,740,744,746,748],{"class":660,"line":661},[658,716,665],{"class":664},[658,718,669],{"class":668},[658,720,673],{"class":672},[658,722,677],{"class":676},[658,724,680],{"class":668},[658,726,683],{"class":672},[658,728,686],{"class":672},[658,730,690],{"class":689},[658,732,693],{"class":672},[658,734,686],{"class":672},[658,736,737],{"class":689}," maxLength",[658,739,693],{"class":672},[658,741,743],{"class":742},"sbssI"," 200",[658,745,700],{"class":672},[658,747,700],{"class":672},[658,749,703],{"class":668},[644,751,753],{"id":752},"redact-sensitive-fields","Redact sensitive fields",[649,755,757],{"className":651,"code":756,"language":653,"meta":654,"style":654},"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",[538,758,759,776,786,800,828,876,885,891,897],{"__ignoreMap":654},[658,760,761,763,765,767,769,771,773],{"class":660,"line":661},[658,762,665],{"class":664},[658,764,669],{"class":668},[658,766,673],{"class":672},[658,768,677],{"class":676},[658,770,680],{"class":668},[658,772,683],{"class":672},[658,774,775],{"class":672}," {\n",[658,777,779,782,784],{"class":660,"line":778},2,[658,780,781],{"class":689},"  toolInputs",[658,783,693],{"class":672},[658,785,775],{"class":672},[658,787,789,792,794,797],{"class":660,"line":788},3,[658,790,791],{"class":689},"    maxLength",[658,793,693],{"class":672},[658,795,796],{"class":742}," 500",[658,798,799],{"class":672},",\n",[658,801,803,806,808,811,815,817,820,823,826],{"class":660,"line":802},4,[658,804,805],{"class":676},"    transform",[658,807,693],{"class":672},[658,809,810],{"class":672}," (",[658,812,814],{"class":813},"sHdIc","input",[658,816,683],{"class":672},[658,818,819],{"class":813}," toolName",[658,821,822],{"class":672},")",[658,824,825],{"class":664}," =>",[658,827,775],{"class":672},[658,829,831,835,837,840,843,846,850,853,856,859,861,864,866,868,871,873],{"class":660,"line":830},5,[658,832,834],{"class":833},"s7zQu","      if",[658,836,810],{"class":689},[658,838,839],{"class":668},"toolName",[658,841,842],{"class":672}," ===",[658,844,845],{"class":672}," '",[658,847,849],{"class":848},"sfazB","queryDB",[658,851,852],{"class":672},"'",[658,854,855],{"class":689},") ",[658,857,858],{"class":833},"return",[658,860,686],{"class":672},[658,862,863],{"class":689}," sql",[658,865,693],{"class":672},[658,867,845],{"class":672},[658,869,870],{"class":848},"***",[658,872,852],{"class":672},[658,874,875],{"class":672}," }\n",[658,877,879,882],{"class":660,"line":878},6,[658,880,881],{"class":833},"      return",[658,883,884],{"class":668}," input\n",[658,886,888],{"class":660,"line":887},7,[658,889,890],{"class":672},"    },\n",[658,892,894],{"class":660,"line":893},8,[658,895,896],{"class":672},"  },\n",[658,898,900,903],{"class":660,"line":899},9,[658,901,902],{"class":672},"}",[658,904,703],{"class":668},[543,906,907,918],{},[546,908,909],{},[549,910,911,914,916],{},[552,912,913],{},"Sub-option",[552,915,557],{},[552,917,563],{},[565,919,920,938],{},[549,921,922,926,931],{},[570,923,924],{},[538,925,637],{},[570,927,928],{},[538,929,930],{},"number",[570,932,933,934,937],{},"Truncate stringified inputs exceeding this character length (appends ",[538,935,936],{},"…",").",[549,939,940,944,949],{},[570,941,942],{},[538,943,641],{},[570,945,946],{},[538,947,948],{},"(input, toolName) => unknown",[570,950,951,952,954],{},"Custom transform applied before ",[538,953,637],{},". Use to redact fields or reshape data.",[535,956,957,958,960,961,963,964,967],{},"When ",[538,959,574],{}," is enabled, ",[538,962,622],{}," becomes an ",[538,965,966],{},"Array\u003C{ name, input }>"," instead of a plain string array.",[613,969,971],{"id":970},"cost-estimation","Cost Estimation",[535,973,974,975,977,978,981],{},"Pass a ",[538,976,594],{}," map to compute estimated dollar cost per call. The middleware multiplies token usage by the per-million rates and sets ",[538,979,980],{},"ai.estimatedCost"," on the wide event.",[649,983,985],{"className":651,"code":984,"language":653,"meta":654,"style":654},"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",[538,986,987,1003,1012,1047,1078,1082],{"__ignoreMap":654},[658,988,989,991,993,995,997,999,1001],{"class":660,"line":661},[658,990,665],{"class":664},[658,992,669],{"class":668},[658,994,673],{"class":672},[658,996,677],{"class":676},[658,998,680],{"class":668},[658,1000,683],{"class":672},[658,1002,775],{"class":672},[658,1004,1005,1008,1010],{"class":660,"line":778},[658,1006,1007],{"class":689},"  cost",[658,1009,693],{"class":672},[658,1011,775],{"class":672},[658,1013,1014,1017,1020,1022,1024,1026,1029,1031,1034,1036,1039,1041,1044],{"class":660,"line":788},[658,1015,1016],{"class":672},"    '",[658,1018,1019],{"class":689},"claude-sonnet-4.6",[658,1021,852],{"class":672},[658,1023,693],{"class":672},[658,1025,686],{"class":672},[658,1027,1028],{"class":689}," input",[658,1030,693],{"class":672},[658,1032,1033],{"class":742}," 3",[658,1035,683],{"class":672},[658,1037,1038],{"class":689}," output",[658,1040,693],{"class":672},[658,1042,1043],{"class":742}," 15",[658,1045,1046],{"class":672}," },\n",[658,1048,1049,1051,1054,1056,1058,1060,1062,1064,1067,1069,1071,1073,1076],{"class":660,"line":802},[658,1050,1016],{"class":672},[658,1052,1053],{"class":689},"gpt-4o",[658,1055,852],{"class":672},[658,1057,693],{"class":672},[658,1059,686],{"class":672},[658,1061,1028],{"class":689},[658,1063,693],{"class":672},[658,1065,1066],{"class":742}," 2.5",[658,1068,683],{"class":672},[658,1070,1038],{"class":689},[658,1072,693],{"class":672},[658,1074,1075],{"class":742}," 10",[658,1077,1046],{"class":672},[658,1079,1080],{"class":660,"line":830},[658,1081,896],{"class":672},[658,1083,1084,1086],{"class":660,"line":878},[658,1085,902],{"class":672},[658,1087,703],{"class":668},[535,1089,1090,1091,1097],{},"Read the result from your handler with ",[1092,1093,1094],"a",{"href":338},[538,1095,1096],{},"ai.getEstimatedCost()",", which suits billing dashboards or warning users before expensive calls.",[1099,1100,1101,1102,1104],"tip",{},"Keep your ",[538,1103,594],{}," map in one file alongside model selection so renaming a model in production also updates pricing. Avoid hardcoding per-route maps.",[613,1106,1108],{"id":1107},"error-handling","Error Handling",[535,1110,1111],{},"If a model call fails, the middleware captures the error into the wide event before re-throwing:",[649,1113,1118],{"className":1114,"code":1115,"filename":1116,"language":1117,"meta":654,"style":654},"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",[538,1119,1120,1125,1140,1158,1178,1198,1218,1236,1241],{"__ignoreMap":654},[658,1121,1122],{"class":660,"line":661},[658,1123,1124],{"class":672},"{\n",[658,1126,1127,1130,1133,1136,1138],{"class":660,"line":778},[658,1128,1129],{"class":672},"  \"",[658,1131,1132],{"class":664},"ai",[658,1134,1135],{"class":672},"\"",[658,1137,693],{"class":672},[658,1139,775],{"class":672},[658,1141,1142,1145,1149,1151,1153,1156],{"class":660,"line":788},[658,1143,1144],{"class":672},"    \"",[658,1146,1148],{"class":1147},"sBMFI","calls",[658,1150,1135],{"class":672},[658,1152,693],{"class":672},[658,1154,1155],{"class":742}," 1",[658,1157,799],{"class":672},[658,1159,1160,1162,1165,1167,1169,1172,1174,1176],{"class":660,"line":802},[658,1161,1144],{"class":672},[658,1163,1164],{"class":1147},"model",[658,1166,1135],{"class":672},[658,1168,693],{"class":672},[658,1170,1171],{"class":672}," \"",[658,1173,1019],{"class":848},[658,1175,1135],{"class":672},[658,1177,799],{"class":672},[658,1179,1180,1182,1185,1187,1189,1191,1194,1196],{"class":660,"line":830},[658,1181,1144],{"class":672},[658,1183,1184],{"class":1147},"provider",[658,1186,1135],{"class":672},[658,1188,693],{"class":672},[658,1190,1171],{"class":672},[658,1192,1193],{"class":848},"anthropic",[658,1195,1135],{"class":672},[658,1197,799],{"class":672},[658,1199,1200,1202,1205,1207,1209,1211,1214,1216],{"class":660,"line":878},[658,1201,1144],{"class":672},[658,1203,1204],{"class":1147},"finishReason",[658,1206,1135],{"class":672},[658,1208,693],{"class":672},[658,1210,1171],{"class":672},[658,1212,1213],{"class":848},"error",[658,1215,1135],{"class":672},[658,1217,799],{"class":672},[658,1219,1220,1222,1224,1226,1228,1230,1233],{"class":660,"line":887},[658,1221,1144],{"class":672},[658,1223,1213],{"class":1147},[658,1225,1135],{"class":672},[658,1227,693],{"class":672},[658,1229,1171],{"class":672},[658,1231,1232],{"class":848},"API rate limit exceeded",[658,1234,1235],{"class":672},"\"\n",[658,1237,1238],{"class":660,"line":893},[658,1239,1240],{"class":672},"  }\n",[658,1242,1243],{"class":660,"line":899},[658,1244,1245],{"class":672},"}\n",[535,1247,1248,1249,1252],{},"Stream errors (e.g. content filter) are also captured from the stream's error chunks. Your error-handling code (",[538,1250,1251],{},"try\u002Fcatch",", route-level error handlers) keeps working as usual, since the middleware only observes.",[1254,1255,1256],"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":654,"searchDepth":778,"depth":778,"links":1258},[1259,1264,1265],{"id":615,"depth":778,"text":616,"children":1260},[1261,1262,1263],{"id":646,"depth":788,"text":647},{"id":706,"depth":788,"text":707},{"id":752,"depth":788,"text":753},{"id":970,"depth":778,"text":971},{"id":1107,"depth":778,"text":1108},"Configure tool input capture (with redaction and truncation), enable cost estimation per model, and handle errors during AI calls.","md",[1269,1272],{"label":128,"icon":140,"to":324,"color":1270,"variant":1271},"neutral","subtle",{"label":1273,"icon":330,"to":328,"color":1270,"variant":1271},"Usage Patterns",{},{"title":332,"icon":335},{"title":332,"description":1266},"LUd2gYCuWeLxyp9ow-0DzuVoq6g9N6Iz535T5ngJKdU",[1279,1281],{"title":327,"path":328,"stem":329,"description":1280,"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":1282,"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.",1786799164162]