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Use ",[456,554,555],{},"maxLength"," and ",[456,558,559],{},"transform"," rather than enabling raw capture in production.",[562,563,565],"h3",{"id":564},"capture-everything","Capture everything",[567,568,573],"pre",{"className":569,"code":570,"language":571,"meta":572,"style":572},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","const ai = createAILogger(log, { toolInputs: true })\n","typescript","",[456,574,575],{"__ignoreMap":572},[576,577,580,584,588,592,596,599,602,605,609,612,616,619],"span",{"class":578,"line":579},"line",1,[576,581,583],{"class":582},"spNyl","const",[576,585,587],{"class":586},"sTEyZ"," ai ",[576,589,591],{"class":590},"sMK4o","=",[576,593,595],{"class":594},"s2Zo4"," createAILogger",[576,597,598],{"class":586},"(log",[576,600,601],{"class":590},",",[576,603,604],{"class":590}," {",[576,606,608],{"class":607},"swJcz"," toolInputs",[576,610,611],{"class":590},":",[576,613,615],{"class":614},"sfNiH"," true",[576,617,618],{"class":590}," }",[576,620,621],{"class":586},")\n",[562,623,625],{"id":624},"truncate-long-inputs","Truncate long inputs",[567,627,629],{"className":569,"code":628,"language":571,"meta":572,"style":572},"const ai = createAILogger(log, { toolInputs: { maxLength: 200 } })\n",[456,630,631],{"__ignoreMap":572},[576,632,633,635,637,639,641,643,645,647,649,651,653,656,658,662,664,666],{"class":578,"line":579},[576,634,583],{"class":582},[576,636,587],{"class":586},[576,638,591],{"class":590},[576,640,595],{"class":594},[576,642,598],{"class":586},[576,644,601],{"class":590},[576,646,604],{"class":590},[576,648,608],{"class":607},[576,650,611],{"class":590},[576,652,604],{"class":590},[576,654,655],{"class":607}," maxLength",[576,657,611],{"class":590},[576,659,661],{"class":660},"sbssI"," 200",[576,663,618],{"class":590},[576,665,618],{"class":590},[576,667,621],{"class":586},[562,669,671],{"id":670},"redact-sensitive-fields","Redact sensitive fields",[567,673,675],{"className":569,"code":674,"language":571,"meta":572,"style":572},"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",[456,676,677,694,704,718,746,794,803,809,815],{"__ignoreMap":572},[576,678,679,681,683,685,687,689,691],{"class":578,"line":579},[576,680,583],{"class":582},[576,682,587],{"class":586},[576,684,591],{"class":590},[576,686,595],{"class":594},[576,688,598],{"class":586},[576,690,601],{"class":590},[576,692,693],{"class":590}," {\n",[576,695,697,700,702],{"class":578,"line":696},2,[576,698,699],{"class":607},"  toolInputs",[576,701,611],{"class":590},[576,703,693],{"class":590},[576,705,707,710,712,715],{"class":578,"line":706},3,[576,708,709],{"class":607},"    maxLength",[576,711,611],{"class":590},[576,713,714],{"class":660}," 500",[576,716,717],{"class":590},",\n",[576,719,721,724,726,729,733,735,738,741,744],{"class":578,"line":720},4,[576,722,723],{"class":594},"    transform",[576,725,611],{"class":590},[576,727,728],{"class":590}," (",[576,730,732],{"class":731},"sHdIc","input",[576,734,601],{"class":590},[576,736,737],{"class":731}," toolName",[576,739,740],{"class":590},")",[576,742,743],{"class":582}," =>",[576,745,693],{"class":590},[576,747,749,753,755,758,761,764,768,771,774,777,779,782,784,786,789,791],{"class":578,"line":748},5,[576,750,752],{"class":751},"s7zQu","      if",[576,754,728],{"class":607},[576,756,757],{"class":586},"toolName",[576,759,760],{"class":590}," ===",[576,762,763],{"class":590}," '",[576,765,767],{"class":766},"sfazB","queryDB",[576,769,770],{"class":590},"'",[576,772,773],{"class":607},") ",[576,775,776],{"class":751},"return",[576,778,604],{"class":590},[576,780,781],{"class":607}," sql",[576,783,611],{"class":590},[576,785,763],{"class":590},[576,787,788],{"class":766},"***",[576,790,770],{"class":590},[576,792,793],{"class":590}," }\n",[576,795,797,800],{"class":578,"line":796},6,[576,798,799],{"class":751},"      return",[576,801,802],{"class":586}," input\n",[576,804,806],{"class":578,"line":805},7,[576,807,808],{"class":590},"    },\n",[576,810,812],{"class":578,"line":811},8,[576,813,814],{"class":590},"  },\n",[576,816,818,821],{"class":578,"line":817},9,[576,819,820],{"class":590},"}",[576,822,621],{"class":586},[461,824,825,836],{},[464,826,827],{},[467,828,829,832,834],{},[470,830,831],{},"Sub-option",[470,833,475],{},[470,835,481],{},[483,837,838,856],{},[467,839,840,844,849],{},[488,841,842],{},[456,843,555],{},[488,845,846],{},[456,847,848],{},"number",[488,850,851,852,855],{},"Truncate stringified inputs exceeding this character length (appends ",[456,853,854],{},"…",").",[467,857,858,862,867],{},[488,859,860],{},[456,861,559],{},[488,863,864],{},[456,865,866],{},"(input, toolName) => unknown",[488,868,869,870,872],{},"Custom transform applied before ",[456,871,555],{},". Use to redact fields or reshape data.",[453,874,875,876,878,879,881,882,885],{},"When ",[456,877,492],{}," is enabled, ",[456,880,540],{}," becomes an ",[456,883,884],{},"Array\u003C{ name, input }>"," instead of a plain string array.",[531,887,889],{"id":888},"cost-estimation","Cost Estimation",[453,891,892,893,895,896,899],{},"Pass a ",[456,894,512],{}," map to compute estimated dollar cost per call. The middleware multiplies token usage by the per-million rates and sets ",[456,897,898],{},"ai.estimatedCost"," on the wide event.",[567,901,903],{"className":569,"code":902,"language":571,"meta":572,"style":572},"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",[456,904,905,921,930,965,996,1000],{"__ignoreMap":572},[576,906,907,909,911,913,915,917,919],{"class":578,"line":579},[576,908,583],{"class":582},[576,910,587],{"class":586},[576,912,591],{"class":590},[576,914,595],{"class":594},[576,916,598],{"class":586},[576,918,601],{"class":590},[576,920,693],{"class":590},[576,922,923,926,928],{"class":578,"line":696},[576,924,925],{"class":607},"  cost",[576,927,611],{"class":590},[576,929,693],{"class":590},[576,931,932,935,938,940,942,944,947,949,952,954,957,959,962],{"class":578,"line":706},[576,933,934],{"class":590},"    '",[576,936,937],{"class":607},"claude-sonnet-4.6",[576,939,770],{"class":590},[576,941,611],{"class":590},[576,943,604],{"class":590},[576,945,946],{"class":607}," input",[576,948,611],{"class":590},[576,950,951],{"class":660}," 3",[576,953,601],{"class":590},[576,955,956],{"class":607}," output",[576,958,611],{"class":590},[576,960,961],{"class":660}," 15",[576,963,964],{"class":590}," },\n",[576,966,967,969,972,974,976,978,980,982,985,987,989,991,994],{"class":578,"line":720},[576,968,934],{"class":590},[576,970,971],{"class":607},"gpt-4o",[576,973,770],{"class":590},[576,975,611],{"class":590},[576,977,604],{"class":590},[576,979,946],{"class":607},[576,981,611],{"class":590},[576,983,984],{"class":660}," 2.5",[576,986,601],{"class":590},[576,988,956],{"class":607},[576,990,611],{"class":590},[576,992,993],{"class":660}," 10",[576,995,964],{"class":590},[576,997,998],{"class":578,"line":748},[576,999,814],{"class":590},[576,1001,1002,1004],{"class":578,"line":796},[576,1003,820],{"class":590},[576,1005,621],{"class":586},[453,1007,1008,1009,1015],{},"Read the result from your handler with ",[1010,1011,1012],"a",{"href":280},[456,1013,1014],{},"ai.getEstimatedCost()"," — useful for billing dashboards or warning users before expensive calls.",[1017,1018,1019,1020,1022],"tip",{},"Keep your ",[456,1021,512],{}," map in one file alongside model selection so renaming a model in production also updates pricing. Avoid hardcoding per-route maps.",[531,1024,1026],{"id":1025},"error-handling","Error Handling",[453,1028,1029],{},"If a model call fails, the middleware captures the error into the wide event before re-throwing:",[567,1031,1036],{"className":1032,"code":1033,"filename":1034,"language":1035,"meta":572,"style":572},"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",[456,1037,1038,1043,1058,1076,1096,1116,1136,1154,1159],{"__ignoreMap":572},[576,1039,1040],{"class":578,"line":579},[576,1041,1042],{"class":590},"{\n",[576,1044,1045,1048,1051,1054,1056],{"class":578,"line":696},[576,1046,1047],{"class":590},"  \"",[576,1049,1050],{"class":582},"ai",[576,1052,1053],{"class":590},"\"",[576,1055,611],{"class":590},[576,1057,693],{"class":590},[576,1059,1060,1063,1067,1069,1071,1074],{"class":578,"line":706},[576,1061,1062],{"class":590},"    \"",[576,1064,1066],{"class":1065},"sBMFI","calls",[576,1068,1053],{"class":590},[576,1070,611],{"class":590},[576,1072,1073],{"class":660}," 1",[576,1075,717],{"class":590},[576,1077,1078,1080,1083,1085,1087,1090,1092,1094],{"class":578,"line":720},[576,1079,1062],{"class":590},[576,1081,1082],{"class":1065},"model",[576,1084,1053],{"class":590},[576,1086,611],{"class":590},[576,1088,1089],{"class":590}," \"",[576,1091,937],{"class":766},[576,1093,1053],{"class":590},[576,1095,717],{"class":590},[576,1097,1098,1100,1103,1105,1107,1109,1112,1114],{"class":578,"line":748},[576,1099,1062],{"class":590},[576,1101,1102],{"class":1065},"provider",[576,1104,1053],{"class":590},[576,1106,611],{"class":590},[576,1108,1089],{"class":590},[576,1110,1111],{"class":766},"anthropic",[576,1113,1053],{"class":590},[576,1115,717],{"class":590},[576,1117,1118,1120,1123,1125,1127,1129,1132,1134],{"class":578,"line":796},[576,1119,1062],{"class":590},[576,1121,1122],{"class":1065},"finishReason",[576,1124,1053],{"class":590},[576,1126,611],{"class":590},[576,1128,1089],{"class":590},[576,1130,1131],{"class":766},"error",[576,1133,1053],{"class":590},[576,1135,717],{"class":590},[576,1137,1138,1140,1142,1144,1146,1148,1151],{"class":578,"line":805},[576,1139,1062],{"class":590},[576,1141,1131],{"class":1065},[576,1143,1053],{"class":590},[576,1145,611],{"class":590},[576,1147,1089],{"class":590},[576,1149,1150],{"class":766},"API rate limit exceeded",[576,1152,1153],{"class":590},"\"\n",[576,1155,1156],{"class":578,"line":811},[576,1157,1158],{"class":590},"  }\n",[576,1160,1161],{"class":578,"line":817},[576,1162,1163],{"class":590},"}\n",[453,1165,1166,1167,1170],{},"Stream errors (e.g. content filter) are also captured from the stream's error chunks. Your error-handling code (",[456,1168,1169],{},"try\u002Fcatch",", route-level error handlers) keeps working as usual — the middleware only observes.",[1172,1173,1174],"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":572,"searchDepth":696,"depth":696,"links":1176},[1177,1182,1183],{"id":533,"depth":696,"text":534,"children":1178},[1179,1180,1181],{"id":564,"depth":706,"text":565},{"id":624,"depth":706,"text":625},{"id":670,"depth":706,"text":671},{"id":888,"depth":696,"text":889},{"id":1025,"depth":696,"text":1026},"Configure tool input capture (with redaction and truncation), enable cost estimation per model, and handle errors during AI calls.","md",[1187,1190],{"label":36,"icon":39,"to":266,"color":1188,"variant":1189},"neutral","subtle",{"label":1191,"icon":272,"to":270,"color":1188,"variant":1189},"Usage Patterns",{},{"title":274,"icon":277},{"title":274,"description":1184},"xoxicNRn-mxuaHTHGhoZYwtQS8UV5jdv8PnqlqWAgjc",[1197,1199],{"title":269,"path":270,"stem":271,"description":1198,"icon":272,"children":-1},"streamText, generateText, multi-step agents, RAG, and multiple models — every common AI SDK pattern wired into evlog.",{"title":279,"path":280,"stem":281,"description":1200,"icon":282,"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.",1782924663384]