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Use ",[463,561,562],{},"maxLength"," and ",[463,565,566],{},"transform"," rather than enabling raw capture in production.",[569,570,572],"h3",{"id":571},"capture-everything","Capture everything",[574,575,580],"pre",{"className":576,"code":577,"language":578,"meta":579,"style":579},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","const ai = createAILogger(log, { toolInputs: true })\n","typescript","",[463,581,582],{"__ignoreMap":579},[583,584,587,591,595,599,603,606,609,612,616,619,623,626],"span",{"class":585,"line":586},"line",1,[583,588,590],{"class":589},"spNyl","const",[583,592,594],{"class":593},"sTEyZ"," ai ",[583,596,598],{"class":597},"sMK4o","=",[583,600,602],{"class":601},"s2Zo4"," createAILogger",[583,604,605],{"class":593},"(log",[583,607,608],{"class":597},",",[583,610,611],{"class":597}," {",[583,613,615],{"class":614},"swJcz"," toolInputs",[583,617,618],{"class":597},":",[583,620,622],{"class":621},"sfNiH"," true",[583,624,625],{"class":597}," }",[583,627,628],{"class":593},")\n",[569,630,632],{"id":631},"truncate-long-inputs","Truncate long inputs",[574,634,636],{"className":576,"code":635,"language":578,"meta":579,"style":579},"const ai = createAILogger(log, { toolInputs: { maxLength: 200 } })\n",[463,637,638],{"__ignoreMap":579},[583,639,640,642,644,646,648,650,652,654,656,658,660,663,665,669,671,673],{"class":585,"line":586},[583,641,590],{"class":589},[583,643,594],{"class":593},[583,645,598],{"class":597},[583,647,602],{"class":601},[583,649,605],{"class":593},[583,651,608],{"class":597},[583,653,611],{"class":597},[583,655,615],{"class":614},[583,657,618],{"class":597},[583,659,611],{"class":597},[583,661,662],{"class":614}," maxLength",[583,664,618],{"class":597},[583,666,668],{"class":667},"sbssI"," 200",[583,670,625],{"class":597},[583,672,625],{"class":597},[583,674,628],{"class":593},[569,676,678],{"id":677},"redact-sensitive-fields","Redact sensitive fields",[574,680,682],{"className":576,"code":681,"language":578,"meta":579,"style":579},"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",[463,683,684,701,711,725,753,801,810,816,822],{"__ignoreMap":579},[583,685,686,688,690,692,694,696,698],{"class":585,"line":586},[583,687,590],{"class":589},[583,689,594],{"class":593},[583,691,598],{"class":597},[583,693,602],{"class":601},[583,695,605],{"class":593},[583,697,608],{"class":597},[583,699,700],{"class":597}," {\n",[583,702,704,707,709],{"class":585,"line":703},2,[583,705,706],{"class":614},"  toolInputs",[583,708,618],{"class":597},[583,710,700],{"class":597},[583,712,714,717,719,722],{"class":585,"line":713},3,[583,715,716],{"class":614},"    maxLength",[583,718,618],{"class":597},[583,720,721],{"class":667}," 500",[583,723,724],{"class":597},",\n",[583,726,728,731,733,736,740,742,745,748,751],{"class":585,"line":727},4,[583,729,730],{"class":601},"    transform",[583,732,618],{"class":597},[583,734,735],{"class":597}," (",[583,737,739],{"class":738},"sHdIc","input",[583,741,608],{"class":597},[583,743,744],{"class":738}," toolName",[583,746,747],{"class":597},")",[583,749,750],{"class":589}," =>",[583,752,700],{"class":597},[583,754,756,760,762,765,768,771,775,778,781,784,786,789,791,793,796,798],{"class":585,"line":755},5,[583,757,759],{"class":758},"s7zQu","      if",[583,761,735],{"class":614},[583,763,764],{"class":593},"toolName",[583,766,767],{"class":597}," ===",[583,769,770],{"class":597}," '",[583,772,774],{"class":773},"sfazB","queryDB",[583,776,777],{"class":597},"'",[583,779,780],{"class":614},") ",[583,782,783],{"class":758},"return",[583,785,611],{"class":597},[583,787,788],{"class":614}," sql",[583,790,618],{"class":597},[583,792,770],{"class":597},[583,794,795],{"class":773},"***",[583,797,777],{"class":597},[583,799,800],{"class":597}," }\n",[583,802,804,807],{"class":585,"line":803},6,[583,805,806],{"class":758},"      return",[583,808,809],{"class":593}," input\n",[583,811,813],{"class":585,"line":812},7,[583,814,815],{"class":597},"    },\n",[583,817,819],{"class":585,"line":818},8,[583,820,821],{"class":597},"  },\n",[583,823,825,828],{"class":585,"line":824},9,[583,826,827],{"class":597},"}",[583,829,628],{"class":593},[468,831,832,843],{},[471,833,834],{},[474,835,836,839,841],{},[477,837,838],{},"Sub-option",[477,840,482],{},[477,842,488],{},[490,844,845,863],{},[474,846,847,851,856],{},[495,848,849],{},[463,850,562],{},[495,852,853],{},[463,854,855],{},"number",[495,857,858,859,862],{},"Truncate stringified inputs exceeding this character length (appends ",[463,860,861],{},"…",").",[474,864,865,869,874],{},[495,866,867],{},[463,868,566],{},[495,870,871],{},[463,872,873],{},"(input, toolName) => unknown",[495,875,876,877,879],{},"Custom transform applied before ",[463,878,562],{},". Use to redact fields or reshape data.",[460,881,882,883,885,886,888,889,892],{},"When ",[463,884,499],{}," is enabled, ",[463,887,547],{}," becomes an ",[463,890,891],{},"Array\u003C{ name, input }>"," instead of a plain string array.",[538,894,896],{"id":895},"cost-estimation","Cost Estimation",[460,898,899,900,902,903,906],{},"Pass a ",[463,901,519],{}," map to compute estimated dollar cost per call. The middleware multiplies token usage by the per-million rates and sets ",[463,904,905],{},"ai.estimatedCost"," on the wide event.",[574,908,910],{"className":576,"code":909,"language":578,"meta":579,"style":579},"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",[463,911,912,928,937,972,1003,1007],{"__ignoreMap":579},[583,913,914,916,918,920,922,924,926],{"class":585,"line":586},[583,915,590],{"class":589},[583,917,594],{"class":593},[583,919,598],{"class":597},[583,921,602],{"class":601},[583,923,605],{"class":593},[583,925,608],{"class":597},[583,927,700],{"class":597},[583,929,930,933,935],{"class":585,"line":703},[583,931,932],{"class":614},"  cost",[583,934,618],{"class":597},[583,936,700],{"class":597},[583,938,939,942,945,947,949,951,954,956,959,961,964,966,969],{"class":585,"line":713},[583,940,941],{"class":597},"    '",[583,943,944],{"class":614},"claude-sonnet-4.6",[583,946,777],{"class":597},[583,948,618],{"class":597},[583,950,611],{"class":597},[583,952,953],{"class":614}," input",[583,955,618],{"class":597},[583,957,958],{"class":667}," 3",[583,960,608],{"class":597},[583,962,963],{"class":614}," output",[583,965,618],{"class":597},[583,967,968],{"class":667}," 15",[583,970,971],{"class":597}," },\n",[583,973,974,976,979,981,983,985,987,989,992,994,996,998,1001],{"class":585,"line":727},[583,975,941],{"class":597},[583,977,978],{"class":614},"gpt-4o",[583,980,777],{"class":597},[583,982,618],{"class":597},[583,984,611],{"class":597},[583,986,953],{"class":614},[583,988,618],{"class":597},[583,990,991],{"class":667}," 2.5",[583,993,608],{"class":597},[583,995,963],{"class":614},[583,997,618],{"class":597},[583,999,1000],{"class":667}," 10",[583,1002,971],{"class":597},[583,1004,1005],{"class":585,"line":755},[583,1006,821],{"class":597},[583,1008,1009,1011],{"class":585,"line":803},[583,1010,827],{"class":597},[583,1012,628],{"class":593},[460,1014,1015,1016,1022],{},"Read the result from your handler with ",[1017,1018,1019],"a",{"href":91},[463,1020,1021],{},"ai.getEstimatedCost()"," — useful for billing dashboards or warning users before expensive calls.",[1024,1025,1026,1027,1029],"tip",{},"Keep your ",[463,1028,519],{}," map in one file alongside model selection so renaming a model in production also updates pricing. Avoid hardcoding per-route maps.",[538,1031,1033],{"id":1032},"error-handling","Error Handling",[460,1035,1036],{},"If a model call fails, the middleware captures the error into the wide event before re-throwing:",[574,1038,1043],{"className":1039,"code":1040,"filename":1041,"language":1042,"meta":579,"style":579},"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",[463,1044,1045,1050,1065,1083,1103,1123,1143,1161,1166],{"__ignoreMap":579},[583,1046,1047],{"class":585,"line":586},[583,1048,1049],{"class":597},"{\n",[583,1051,1052,1055,1058,1061,1063],{"class":585,"line":703},[583,1053,1054],{"class":597},"  \"",[583,1056,1057],{"class":589},"ai",[583,1059,1060],{"class":597},"\"",[583,1062,618],{"class":597},[583,1064,700],{"class":597},[583,1066,1067,1070,1074,1076,1078,1081],{"class":585,"line":713},[583,1068,1069],{"class":597},"    \"",[583,1071,1073],{"class":1072},"sBMFI","calls",[583,1075,1060],{"class":597},[583,1077,618],{"class":597},[583,1079,1080],{"class":667}," 1",[583,1082,724],{"class":597},[583,1084,1085,1087,1090,1092,1094,1097,1099,1101],{"class":585,"line":727},[583,1086,1069],{"class":597},[583,1088,1089],{"class":1072},"model",[583,1091,1060],{"class":597},[583,1093,618],{"class":597},[583,1095,1096],{"class":597}," \"",[583,1098,944],{"class":773},[583,1100,1060],{"class":597},[583,1102,724],{"class":597},[583,1104,1105,1107,1110,1112,1114,1116,1119,1121],{"class":585,"line":755},[583,1106,1069],{"class":597},[583,1108,1109],{"class":1072},"provider",[583,1111,1060],{"class":597},[583,1113,618],{"class":597},[583,1115,1096],{"class":597},[583,1117,1118],{"class":773},"anthropic",[583,1120,1060],{"class":597},[583,1122,724],{"class":597},[583,1124,1125,1127,1130,1132,1134,1136,1139,1141],{"class":585,"line":803},[583,1126,1069],{"class":597},[583,1128,1129],{"class":1072},"finishReason",[583,1131,1060],{"class":597},[583,1133,618],{"class":597},[583,1135,1096],{"class":597},[583,1137,1138],{"class":773},"error",[583,1140,1060],{"class":597},[583,1142,724],{"class":597},[583,1144,1145,1147,1149,1151,1153,1155,1158],{"class":585,"line":812},[583,1146,1069],{"class":597},[583,1148,1138],{"class":1072},[583,1150,1060],{"class":597},[583,1152,618],{"class":597},[583,1154,1096],{"class":597},[583,1156,1157],{"class":773},"API rate limit exceeded",[583,1159,1160],{"class":597},"\"\n",[583,1162,1163],{"class":585,"line":818},[583,1164,1165],{"class":597},"  }\n",[583,1167,1168],{"class":585,"line":824},[583,1169,1170],{"class":597},"}\n",[460,1172,1173,1174,1177],{},"Stream errors (e.g. content filter) are also captured from the stream's error chunks. Your error-handling code (",[463,1175,1176],{},"try\u002Fcatch",", route-level error handlers) keeps working as usual — the middleware only observes.",[1179,1180,1181],"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":579,"searchDepth":703,"depth":703,"links":1183},[1184,1189,1190],{"id":540,"depth":703,"text":541,"children":1185},[1186,1187,1188],{"id":571,"depth":713,"text":572},{"id":631,"depth":713,"text":632},{"id":677,"depth":713,"text":678},{"id":895,"depth":703,"text":896},{"id":1032,"depth":703,"text":1033},"Configure tool input capture (with redaction and truncation), enable cost estimation per model, and handle errors during AI calls.","md",[1194,1197],{"label":41,"icon":44,"to":77,"color":1195,"variant":1196},"neutral","subtle",{"label":1198,"icon":83,"to":81,"color":1195,"variant":1196},"Usage Patterns",{},{"title":85,"icon":88},{"title":85,"description":1191},"wNWYlAoixuzpqUkoMmAWzxK3lYeBu_IxjZhS0DnZOSs",[1204,1206],{"title":80,"path":81,"stem":82,"description":1205,"icon":83,"children":-1},"streamText, generateText, multi-step agents, RAG, and multiple models — every common AI SDK pattern wired into evlog.",{"title":90,"path":91,"stem":92,"description":1207,"icon":93,"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.",1778340938273]