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Reach for ",[542,640,641],{},"maxLength"," and ",[542,644,645],{},"transform"," before raw capture in production.",[648,649,651],"h3",{"id":650},"capture-everything","Capture everything",[653,654,659],"pre",{"className":655,"code":656,"language":657,"meta":658,"style":658},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","const ai = createAILogger(log, { toolInputs: true })\n","typescript","",[542,660,661],{"__ignoreMap":658},[662,663,666,670,674,678,682,685,688,691,695,698,702,705],"span",{"class":664,"line":665},"line",1,[662,667,669],{"class":668},"spNyl","const",[662,671,673],{"class":672},"sTEyZ"," ai ",[662,675,677],{"class":676},"sMK4o","=",[662,679,681],{"class":680},"s2Zo4"," createAILogger",[662,683,684],{"class":672},"(log",[662,686,687],{"class":676},",",[662,689,690],{"class":676}," {",[662,692,694],{"class":693},"swJcz"," toolInputs",[662,696,697],{"class":676},":",[662,699,701],{"class":700},"sfNiH"," true",[662,703,704],{"class":676}," }",[662,706,707],{"class":672},")\n",[648,709,711],{"id":710},"truncate-long-inputs","Truncate long inputs",[653,713,715],{"className":655,"code":714,"language":657,"meta":658,"style":658},"const ai = createAILogger(log, { toolInputs: { maxLength: 200 } })\n",[542,716,717],{"__ignoreMap":658},[662,718,719,721,723,725,727,729,731,733,735,737,739,742,744,748,750,752],{"class":664,"line":665},[662,720,669],{"class":668},[662,722,673],{"class":672},[662,724,677],{"class":676},[662,726,681],{"class":680},[662,728,684],{"class":672},[662,730,687],{"class":676},[662,732,690],{"class":676},[662,734,694],{"class":693},[662,736,697],{"class":676},[662,738,690],{"class":676},[662,740,741],{"class":693}," maxLength",[662,743,697],{"class":676},[662,745,747],{"class":746},"sbssI"," 200",[662,749,704],{"class":676},[662,751,704],{"class":676},[662,753,707],{"class":672},[648,755,757],{"id":756},"redact-sensitive-fields","Redact sensitive fields",[653,759,761],{"className":655,"code":760,"language":657,"meta":658,"style":658},"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",[542,762,763,780,790,804,832,880,889,895,901],{"__ignoreMap":658},[662,764,765,767,769,771,773,775,777],{"class":664,"line":665},[662,766,669],{"class":668},[662,768,673],{"class":672},[662,770,677],{"class":676},[662,772,681],{"class":680},[662,774,684],{"class":672},[662,776,687],{"class":676},[662,778,779],{"class":676}," {\n",[662,781,783,786,788],{"class":664,"line":782},2,[662,784,785],{"class":693},"  toolInputs",[662,787,697],{"class":676},[662,789,779],{"class":676},[662,791,793,796,798,801],{"class":664,"line":792},3,[662,794,795],{"class":693},"    maxLength",[662,797,697],{"class":676},[662,799,800],{"class":746}," 500",[662,802,803],{"class":676},",\n",[662,805,807,810,812,815,819,821,824,827,830],{"class":664,"line":806},4,[662,808,809],{"class":680},"    transform",[662,811,697],{"class":676},[662,813,814],{"class":676}," (",[662,816,818],{"class":817},"sHdIc","input",[662,820,687],{"class":676},[662,822,823],{"class":817}," toolName",[662,825,826],{"class":676},")",[662,828,829],{"class":668}," =>",[662,831,779],{"class":676},[662,833,835,839,841,844,847,850,854,857,860,863,865,868,870,872,875,877],{"class":664,"line":834},5,[662,836,838],{"class":837},"s7zQu","      if",[662,840,814],{"class":693},[662,842,843],{"class":672},"toolName",[662,845,846],{"class":676}," ===",[662,848,849],{"class":676}," '",[662,851,853],{"class":852},"sfazB","queryDB",[662,855,856],{"class":676},"'",[662,858,859],{"class":693},") ",[662,861,862],{"class":837},"return",[662,864,690],{"class":676},[662,866,867],{"class":693}," sql",[662,869,697],{"class":676},[662,871,849],{"class":676},[662,873,874],{"class":852},"***",[662,876,856],{"class":676},[662,878,879],{"class":676}," }\n",[662,881,883,886],{"class":664,"line":882},6,[662,884,885],{"class":837},"      return",[662,887,888],{"class":672}," input\n",[662,890,892],{"class":664,"line":891},7,[662,893,894],{"class":676},"    },\n",[662,896,898],{"class":664,"line":897},8,[662,899,900],{"class":676},"  },\n",[662,902,904,907],{"class":664,"line":903},9,[662,905,906],{"class":676},"}",[662,908,707],{"class":672},[547,910,911,922],{},[550,912,913],{},[553,914,915,918,920],{},[556,916,917],{},"Sub-option",[556,919,561],{},[556,921,567],{},[569,923,924,942],{},[553,925,926,930,935],{},[574,927,928],{},[542,929,641],{},[574,931,932],{},[542,933,934],{},"number",[574,936,937,938,941],{},"Truncate stringified inputs exceeding this character length (appends ",[542,939,940],{},"…",").",[553,943,944,948,953],{},[574,945,946],{},[542,947,645],{},[574,949,950],{},[542,951,952],{},"(input, toolName) => unknown",[574,954,955,956,958],{},"Custom transform applied before ",[542,957,641],{},". Use to redact fields or reshape data.",[539,960,961,962,964,965,967,968,971],{},"When ",[542,963,578],{}," is enabled, ",[542,966,626],{}," becomes an ",[542,969,970],{},"Array\u003C{ name, input }>"," instead of a plain string array.",[617,973,975],{"id":974},"cost-estimation","Cost Estimation",[539,977,978,979,981,982,985],{},"Pass a ",[542,980,598],{}," map to compute estimated dollar cost per call. The middleware multiplies token usage by the per-million rates and sets ",[542,983,984],{},"ai.estimatedCost"," on the wide event.",[653,987,989],{"className":655,"code":988,"language":657,"meta":658,"style":658},"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",[542,990,991,1007,1016,1051,1082,1086],{"__ignoreMap":658},[662,992,993,995,997,999,1001,1003,1005],{"class":664,"line":665},[662,994,669],{"class":668},[662,996,673],{"class":672},[662,998,677],{"class":676},[662,1000,681],{"class":680},[662,1002,684],{"class":672},[662,1004,687],{"class":676},[662,1006,779],{"class":676},[662,1008,1009,1012,1014],{"class":664,"line":782},[662,1010,1011],{"class":693},"  cost",[662,1013,697],{"class":676},[662,1015,779],{"class":676},[662,1017,1018,1021,1024,1026,1028,1030,1033,1035,1038,1040,1043,1045,1048],{"class":664,"line":792},[662,1019,1020],{"class":676},"    '",[662,1022,1023],{"class":693},"claude-sonnet-4.6",[662,1025,856],{"class":676},[662,1027,697],{"class":676},[662,1029,690],{"class":676},[662,1031,1032],{"class":693}," input",[662,1034,697],{"class":676},[662,1036,1037],{"class":746}," 3",[662,1039,687],{"class":676},[662,1041,1042],{"class":693}," output",[662,1044,697],{"class":676},[662,1046,1047],{"class":746}," 15",[662,1049,1050],{"class":676}," },\n",[662,1052,1053,1055,1058,1060,1062,1064,1066,1068,1071,1073,1075,1077,1080],{"class":664,"line":806},[662,1054,1020],{"class":676},[662,1056,1057],{"class":693},"gpt-4o",[662,1059,856],{"class":676},[662,1061,697],{"class":676},[662,1063,690],{"class":676},[662,1065,1032],{"class":693},[662,1067,697],{"class":676},[662,1069,1070],{"class":746}," 2.5",[662,1072,687],{"class":676},[662,1074,1042],{"class":693},[662,1076,697],{"class":676},[662,1078,1079],{"class":746}," 10",[662,1081,1050],{"class":676},[662,1083,1084],{"class":664,"line":834},[662,1085,900],{"class":676},[662,1087,1088,1090],{"class":664,"line":882},[662,1089,906],{"class":676},[662,1091,707],{"class":672},[539,1093,1094,1095,1101],{},"Read the result from your handler with ",[1096,1097,1098],"a",{"href":338},[542,1099,1100],{},"ai.getEstimatedCost()",", which suits billing dashboards or warning users before expensive calls.",[1103,1104,1105,1106,1108],"tip",{},"Keep your ",[542,1107,598],{}," 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.",[617,1110,1112],{"id":1111},"error-handling","Error Handling",[539,1114,1115],{},"If a model call fails, the middleware captures the error into the wide event before re-throwing:",[653,1117,1122],{"className":1118,"code":1119,"filename":1120,"language":1121,"meta":658,"style":658},"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",[542,1123,1124,1129,1144,1162,1182,1202,1222,1240,1245],{"__ignoreMap":658},[662,1125,1126],{"class":664,"line":665},[662,1127,1128],{"class":676},"{\n",[662,1130,1131,1134,1137,1140,1142],{"class":664,"line":782},[662,1132,1133],{"class":676},"  \"",[662,1135,1136],{"class":668},"ai",[662,1138,1139],{"class":676},"\"",[662,1141,697],{"class":676},[662,1143,779],{"class":676},[662,1145,1146,1149,1153,1155,1157,1160],{"class":664,"line":792},[662,1147,1148],{"class":676},"    \"",[662,1150,1152],{"class":1151},"sBMFI","calls",[662,1154,1139],{"class":676},[662,1156,697],{"class":676},[662,1158,1159],{"class":746}," 1",[662,1161,803],{"class":676},[662,1163,1164,1166,1169,1171,1173,1176,1178,1180],{"class":664,"line":806},[662,1165,1148],{"class":676},[662,1167,1168],{"class":1151},"model",[662,1170,1139],{"class":676},[662,1172,697],{"class":676},[662,1174,1175],{"class":676}," \"",[662,1177,1023],{"class":852},[662,1179,1139],{"class":676},[662,1181,803],{"class":676},[662,1183,1184,1186,1189,1191,1193,1195,1198,1200],{"class":664,"line":834},[662,1185,1148],{"class":676},[662,1187,1188],{"class":1151},"provider",[662,1190,1139],{"class":676},[662,1192,697],{"class":676},[662,1194,1175],{"class":676},[662,1196,1197],{"class":852},"anthropic",[662,1199,1139],{"class":676},[662,1201,803],{"class":676},[662,1203,1204,1206,1209,1211,1213,1215,1218,1220],{"class":664,"line":882},[662,1205,1148],{"class":676},[662,1207,1208],{"class":1151},"finishReason",[662,1210,1139],{"class":676},[662,1212,697],{"class":676},[662,1214,1175],{"class":676},[662,1216,1217],{"class":852},"error",[662,1219,1139],{"class":676},[662,1221,803],{"class":676},[662,1223,1224,1226,1228,1230,1232,1234,1237],{"class":664,"line":891},[662,1225,1148],{"class":676},[662,1227,1217],{"class":1151},[662,1229,1139],{"class":676},[662,1231,697],{"class":676},[662,1233,1175],{"class":676},[662,1235,1236],{"class":852},"API rate limit exceeded",[662,1238,1239],{"class":676},"\"\n",[662,1241,1242],{"class":664,"line":897},[662,1243,1244],{"class":676},"  }\n",[662,1246,1247],{"class":664,"line":903},[662,1248,1249],{"class":676},"}\n",[539,1251,1252,1253,1256],{},"Stream errors (e.g. content filter) are also captured from the stream's error chunks. Your error-handling code (",[542,1254,1255],{},"try\u002Fcatch",", route-level error handlers) keeps working as usual, since the middleware only observes.",[1258,1259,1260],"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":658,"searchDepth":782,"depth":782,"links":1262},[1263,1268,1269],{"id":619,"depth":782,"text":620,"children":1264},[1265,1266,1267],{"id":650,"depth":792,"text":651},{"id":710,"depth":792,"text":711},{"id":756,"depth":792,"text":757},{"id":974,"depth":782,"text":975},{"id":1111,"depth":782,"text":1112},"Configure tool input capture (with redaction and truncation), enable cost estimation per model, and handle errors during AI calls.","md",[1273,1276],{"label":128,"icon":140,"to":324,"color":1274,"variant":1275},"neutral","subtle",{"label":1277,"icon":330,"to":328,"color":1274,"variant":1275},"Usage Patterns",{},{"title":332,"icon":335},{"title":332,"description":1270},"lkJ9lfJfAdZ7-AxVzfHwoaTGWZFD31OFdRFkIRfpxS4",[1283,1285],{"title":327,"path":328,"stem":329,"description":1284,"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":1286,"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.",1786806597311]