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Reach for ",[547,689,690],{},"maxLength"," and ",[547,693,694],{},"transform"," before raw capture in production.",[697,698,700],"h3",{"id":699},"capture-everything","Capture everything",[702,703,708],"pre",{"className":704,"code":705,"language":706,"meta":707,"style":707},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","const ai = createAILogger(log, { toolInputs: true })\n","typescript","",[547,709,710],{"__ignoreMap":707},[711,712,715,719,723,727,731,734,737,740,744,747,751,754],"span",{"class":713,"line":714},"line",1,[711,716,718],{"class":717},"spNyl","const",[711,720,722],{"class":721},"sTEyZ"," ai ",[711,724,726],{"class":725},"sMK4o","=",[711,728,730],{"class":729},"s2Zo4"," createAILogger",[711,732,733],{"class":721},"(log",[711,735,736],{"class":725},",",[711,738,739],{"class":725}," {",[711,741,743],{"class":742},"swJcz"," toolInputs",[711,745,746],{"class":725},":",[711,748,750],{"class":749},"sfNiH"," true",[711,752,753],{"class":725}," }",[711,755,756],{"class":721},")\n",[697,758,760],{"id":759},"truncate-long-inputs","Truncate long inputs",[702,762,764],{"className":704,"code":763,"language":706,"meta":707,"style":707},"const ai = createAILogger(log, { toolInputs: { maxLength: 200 } })\n",[547,765,766],{"__ignoreMap":707},[711,767,768,770,772,774,776,778,780,782,784,786,788,791,793,797,799,801],{"class":713,"line":714},[711,769,718],{"class":717},[711,771,722],{"class":721},[711,773,726],{"class":725},[711,775,730],{"class":729},[711,777,733],{"class":721},[711,779,736],{"class":725},[711,781,739],{"class":725},[711,783,743],{"class":742},[711,785,746],{"class":725},[711,787,739],{"class":725},[711,789,790],{"class":742}," maxLength",[711,792,746],{"class":725},[711,794,796],{"class":795},"sbssI"," 200",[711,798,753],{"class":725},[711,800,753],{"class":725},[711,802,756],{"class":721},[697,804,806],{"id":805},"redact-sensitive-fields","Redact sensitive fields",[702,808,810],{"className":704,"code":809,"language":706,"meta":707,"style":707},"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",[547,811,812,829,839,853,881,929,938,944,950],{"__ignoreMap":707},[711,813,814,816,818,820,822,824,826],{"class":713,"line":714},[711,815,718],{"class":717},[711,817,722],{"class":721},[711,819,726],{"class":725},[711,821,730],{"class":729},[711,823,733],{"class":721},[711,825,736],{"class":725},[711,827,828],{"class":725}," {\n",[711,830,832,835,837],{"class":713,"line":831},2,[711,833,834],{"class":742},"  toolInputs",[711,836,746],{"class":725},[711,838,828],{"class":725},[711,840,842,845,847,850],{"class":713,"line":841},3,[711,843,844],{"class":742},"    maxLength",[711,846,746],{"class":725},[711,848,849],{"class":795}," 500",[711,851,852],{"class":725},",\n",[711,854,856,859,861,864,868,870,873,876,879],{"class":713,"line":855},4,[711,857,858],{"class":729},"    transform",[711,860,746],{"class":725},[711,862,863],{"class":725}," (",[711,865,867],{"class":866},"sHdIc","input",[711,869,736],{"class":725},[711,871,872],{"class":866}," toolName",[711,874,875],{"class":725},")",[711,877,878],{"class":717}," =>",[711,880,828],{"class":725},[711,882,884,888,890,893,896,899,903,906,909,912,914,917,919,921,924,926],{"class":713,"line":883},5,[711,885,887],{"class":886},"s7zQu","      if",[711,889,863],{"class":742},[711,891,892],{"class":721},"toolName",[711,894,895],{"class":725}," ===",[711,897,898],{"class":725}," '",[711,900,902],{"class":901},"sfazB","queryDB",[711,904,905],{"class":725},"'",[711,907,908],{"class":742},") ",[711,910,911],{"class":886},"return",[711,913,739],{"class":725},[711,915,916],{"class":742}," sql",[711,918,746],{"class":725},[711,920,898],{"class":725},[711,922,923],{"class":901},"***",[711,925,905],{"class":725},[711,927,928],{"class":725}," }\n",[711,930,932,935],{"class":713,"line":931},6,[711,933,934],{"class":886},"      return",[711,936,937],{"class":721}," input\n",[711,939,941],{"class":713,"line":940},7,[711,942,943],{"class":725},"    },\n",[711,945,947],{"class":713,"line":946},8,[711,948,949],{"class":725},"  },\n",[711,951,953,956],{"class":713,"line":952},9,[711,954,955],{"class":725},"}",[711,957,756],{"class":721},[552,959,960,971],{},[555,961,962],{},[558,963,964,967,969],{},[561,965,966],{},"Sub-option",[561,968,566],{},[561,970,572],{},[574,972,973,991],{},[558,974,975,979,984],{},[579,976,977],{},[547,978,690],{},[579,980,981],{},[547,982,983],{},"number",[579,985,986,987,990],{},"Truncate stringified inputs exceeding this character length (appends ",[547,988,989],{},"…",").",[558,992,993,997,1002],{},[579,994,995],{},[547,996,694],{},[579,998,999],{},[547,1000,1001],{},"(input, toolName) => unknown",[579,1003,1004,1005,1007],{},"Custom transform applied before ",[547,1006,690],{},". Use to redact fields or reshape data.",[544,1009,1010,1011,1013,1014,1016,1017,1020],{},"When ",[547,1012,583],{}," is enabled, ",[547,1015,675],{}," becomes an ",[547,1018,1019],{},"Array\u003C{ name, input }>"," instead of a plain string array.",[666,1022,1024],{"id":1023},"prompt-and-output-capture","Prompt and Output Capture",[544,1026,1027,1028,1030,1031,1033],{},"By default, nothing the model was sent or returned reaches your drain. Two independent options turn capture on, one per direction: ",[547,1029,603],{}," records what was sent, ",[547,1032,626],{}," records what came back. Enable one, the other, or both.",[702,1035,1037],{"className":704,"code":1036,"language":706,"meta":707,"style":707},"const ai = createAILogger(log, { prompt: true, output: true })\n",[547,1038,1039],{"__ignoreMap":707},[711,1040,1041,1043,1045,1047,1049,1051,1053,1055,1058,1060,1062,1064,1067,1069,1071,1073],{"class":713,"line":714},[711,1042,718],{"class":717},[711,1044,722],{"class":721},[711,1046,726],{"class":725},[711,1048,730],{"class":729},[711,1050,733],{"class":721},[711,1052,736],{"class":725},[711,1054,739],{"class":725},[711,1056,1057],{"class":742}," prompt",[711,1059,746],{"class":725},[711,1061,750],{"class":749},[711,1063,736],{"class":725},[711,1065,1066],{"class":742}," output",[711,1068,746],{"class":725},[711,1070,750],{"class":749},[711,1072,753],{"class":725},[711,1074,756],{"class":721},[544,1076,1077],{},"The wide event then carries:",[1079,1080,1081,1104],"ul",{},[1082,1083,1084,1086,1087,1091,1092,1095,1096,1099,1100,1103],"li",{},[547,1085,618],{},": the formatted text of the prompt sent to the ",[1088,1089,1090],"strong",{},"first"," model call. One block per message prefixed with its role; text parts are inlined, and other part types become ",[547,1093,1094],{},"[tool-call name]",", ",[547,1097,1098],{},"[tool-result name]"," or ",[547,1101,1102],{},"[file]"," markers.",[1082,1105,1106,1108,1109,1112],{},[547,1107,640],{},": the text generated by the ",[1088,1110,1111],{},"last"," model call, the final answer in a multi-step run. Streamed responses accumulate from the text chunks.",[544,1114,1115],{},"Capture only the direction you need:",[702,1117,1119],{"className":704,"code":1118,"language":706,"meta":707,"style":707},"const ai = createAILogger(log, { prompt: true }) \u002F\u002F ai.prompt only\nconst ai = createAILogger(log, { output: true }) \u002F\u002F ai.output only\n",[547,1120,1121,1151],{"__ignoreMap":707},[711,1122,1123,1125,1127,1129,1131,1133,1135,1137,1139,1141,1143,1145,1147],{"class":713,"line":714},[711,1124,718],{"class":717},[711,1126,722],{"class":721},[711,1128,726],{"class":725},[711,1130,730],{"class":729},[711,1132,733],{"class":721},[711,1134,736],{"class":725},[711,1136,739],{"class":725},[711,1138,1057],{"class":742},[711,1140,746],{"class":725},[711,1142,750],{"class":749},[711,1144,753],{"class":725},[711,1146,908],{"class":721},[711,1148,1150],{"class":1149},"sHwdD","\u002F\u002F ai.prompt only\n",[711,1152,1153,1155,1157,1159,1161,1163,1165,1167,1169,1171,1173,1175,1177],{"class":713,"line":831},[711,1154,718],{"class":717},[711,1156,722],{"class":721},[711,1158,726],{"class":725},[711,1160,730],{"class":729},[711,1162,733],{"class":721},[711,1164,736],{"class":725},[711,1166,739],{"class":725},[711,1168,1066],{"class":742},[711,1170,746],{"class":725},[711,1172,750],{"class":749},[711,1174,753],{"class":725},[711,1176,908],{"class":721},[711,1178,1179],{"class":1149},"\u002F\u002F ai.output only\n",[685,1181,1182,1183,691,1185,695],{},"Prompts and outputs can be large, and they carry whatever your users typed. Reach for ",[547,1184,690],{},[547,1186,694],{},[697,1188,1190],{"id":1189},"truncate-long-content","Truncate long content",[544,1192,1193,1194,746],{},"Each option takes its own ",[547,1195,690],{},[702,1197,1199],{"className":704,"code":1198,"language":706,"meta":707,"style":707},"const ai = createAILogger(log, { prompt: { maxLength: 500 } })\n",[547,1200,1201],{"__ignoreMap":707},[711,1202,1203,1205,1207,1209,1211,1213,1215,1217,1219,1221,1223,1225,1227,1229,1231,1233],{"class":713,"line":714},[711,1204,718],{"class":717},[711,1206,722],{"class":721},[711,1208,726],{"class":725},[711,1210,730],{"class":729},[711,1212,733],{"class":721},[711,1214,736],{"class":725},[711,1216,739],{"class":725},[711,1218,1057],{"class":742},[711,1220,746],{"class":725},[711,1222,739],{"class":725},[711,1224,790],{"class":742},[711,1226,746],{"class":725},[711,1228,849],{"class":795},[711,1230,753],{"class":725},[711,1232,753],{"class":725},[711,1234,756],{"class":721},[697,1236,1238],{"id":1237},"redact-or-reshape","Redact or reshape",[544,1240,1241,1243,1244,746],{},[547,1242,694],{}," receives the captured text and runs before ",[547,1245,690],{},[702,1247,1249],{"className":704,"code":1248,"language":706,"meta":707,"style":707},"const ai = createAILogger(log, {\n  prompt: {\n    maxLength: 500,\n    transform: text => redact(text),\n  },\n})\n",[547,1250,1251,1267,1276,1286,1305,1309],{"__ignoreMap":707},[711,1252,1253,1255,1257,1259,1261,1263,1265],{"class":713,"line":714},[711,1254,718],{"class":717},[711,1256,722],{"class":721},[711,1258,726],{"class":725},[711,1260,730],{"class":729},[711,1262,733],{"class":721},[711,1264,736],{"class":725},[711,1266,828],{"class":725},[711,1268,1269,1272,1274],{"class":713,"line":831},[711,1270,1271],{"class":742},"  prompt",[711,1273,746],{"class":725},[711,1275,828],{"class":725},[711,1277,1278,1280,1282,1284],{"class":713,"line":841},[711,1279,844],{"class":742},[711,1281,746],{"class":725},[711,1283,849],{"class":795},[711,1285,852],{"class":725},[711,1287,1288,1290,1292,1295,1297,1300,1303],{"class":713,"line":855},[711,1289,858],{"class":729},[711,1291,746],{"class":725},[711,1293,1294],{"class":866}," text",[711,1296,878],{"class":717},[711,1298,1299],{"class":729}," redact",[711,1301,1302],{"class":721},"(text)",[711,1304,852],{"class":725},[711,1306,1307],{"class":713,"line":883},[711,1308,949],{"class":725},[711,1310,1311,1313],{"class":713,"line":931},[711,1312,955],{"class":725},[711,1314,756],{"class":721},[552,1316,1317,1327],{},[555,1318,1319],{},[558,1320,1321,1323,1325],{},[561,1322,966],{},[561,1324,566],{},[561,1326,572],{},[574,1328,1329,1344],{},[558,1330,1331,1335,1339],{},[579,1332,1333],{},[547,1334,690],{},[579,1336,1337],{},[547,1338,983],{},[579,1340,1341,1342,990],{},"Truncate captured text exceeding this character length (appends ",[547,1343,989],{},[558,1345,1346,1350,1355],{},[579,1347,1348],{},[547,1349,694],{},[579,1351,1352],{},[547,1353,1354],{},"(content) => string",[579,1356,1004,1357,1359],{},[547,1358,690],{},".",[1361,1362,1363,1364,691,1367,1370,1371,1374,1375,691,1377,1379],"note",{},"Prompt and output capture is a middleware capability: it works with ",[547,1365,1366],{},"createAILogger",[547,1368,1369],{},"createAIMiddleware",". The standalone ",[547,1372,1373],{},"createEvlogIntegration"," observes telemetry events and has no access to the model call parameters, so ",[547,1376,618],{},[547,1378,640],{}," stay absent there.",[666,1381,1383],{"id":1382},"cost-estimation","Cost Estimation",[544,1385,1386,1387,1389,1390,1393],{},"Pass a ",[547,1388,647],{}," map to compute estimated dollar cost per call. The middleware multiplies token usage by the per-million rates and sets ",[547,1391,1392],{},"ai.estimatedCost"," on the wide event.",[702,1395,1397],{"className":704,"code":1396,"language":706,"meta":707,"style":707},"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",[547,1398,1399,1415,1424,1458,1489,1493],{"__ignoreMap":707},[711,1400,1401,1403,1405,1407,1409,1411,1413],{"class":713,"line":714},[711,1402,718],{"class":717},[711,1404,722],{"class":721},[711,1406,726],{"class":725},[711,1408,730],{"class":729},[711,1410,733],{"class":721},[711,1412,736],{"class":725},[711,1414,828],{"class":725},[711,1416,1417,1420,1422],{"class":713,"line":831},[711,1418,1419],{"class":742},"  cost",[711,1421,746],{"class":725},[711,1423,828],{"class":725},[711,1425,1426,1429,1432,1434,1436,1438,1441,1443,1446,1448,1450,1452,1455],{"class":713,"line":841},[711,1427,1428],{"class":725},"    '",[711,1430,1431],{"class":742},"claude-sonnet-4.6",[711,1433,905],{"class":725},[711,1435,746],{"class":725},[711,1437,739],{"class":725},[711,1439,1440],{"class":742}," input",[711,1442,746],{"class":725},[711,1444,1445],{"class":795}," 3",[711,1447,736],{"class":725},[711,1449,1066],{"class":742},[711,1451,746],{"class":725},[711,1453,1454],{"class":795}," 15",[711,1456,1457],{"class":725}," },\n",[711,1459,1460,1462,1465,1467,1469,1471,1473,1475,1478,1480,1482,1484,1487],{"class":713,"line":855},[711,1461,1428],{"class":725},[711,1463,1464],{"class":742},"gpt-4o",[711,1466,905],{"class":725},[711,1468,746],{"class":725},[711,1470,739],{"class":725},[711,1472,1440],{"class":742},[711,1474,746],{"class":725},[711,1476,1477],{"class":795}," 2.5",[711,1479,736],{"class":725},[711,1481,1066],{"class":742},[711,1483,746],{"class":725},[711,1485,1486],{"class":795}," 10",[711,1488,1457],{"class":725},[711,1490,1491],{"class":713,"line":883},[711,1492,949],{"class":725},[711,1494,1495,1497],{"class":713,"line":931},[711,1496,955],{"class":725},[711,1498,756],{"class":721},[544,1500,1501,1502,1508],{},"Read the result from your handler with ",[1503,1504,1505],"a",{"href":342},[547,1506,1507],{},"ai.getEstimatedCost()",", which suits billing dashboards or warning users before expensive calls.",[1510,1511,1512,1513,1515],"tip",{},"Keep your ",[547,1514,647],{}," 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.",[666,1517,1519],{"id":1518},"error-handling","Error Handling",[544,1521,1522],{},"If a model call fails, the middleware captures the error into the wide event before re-throwing:",[702,1524,1529],{"className":1525,"code":1526,"filename":1527,"language":1528,"meta":707,"style":707},"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",[547,1530,1531,1536,1551,1569,1589,1609,1629,1647,1652],{"__ignoreMap":707},[711,1532,1533],{"class":713,"line":714},[711,1534,1535],{"class":725},"{\n",[711,1537,1538,1541,1544,1547,1549],{"class":713,"line":831},[711,1539,1540],{"class":725},"  \"",[711,1542,1543],{"class":717},"ai",[711,1545,1546],{"class":725},"\"",[711,1548,746],{"class":725},[711,1550,828],{"class":725},[711,1552,1553,1556,1560,1562,1564,1567],{"class":713,"line":841},[711,1554,1555],{"class":725},"    \"",[711,1557,1559],{"class":1558},"sBMFI","calls",[711,1561,1546],{"class":725},[711,1563,746],{"class":725},[711,1565,1566],{"class":795}," 1",[711,1568,852],{"class":725},[711,1570,1571,1573,1576,1578,1580,1583,1585,1587],{"class":713,"line":855},[711,1572,1555],{"class":725},[711,1574,1575],{"class":1558},"model",[711,1577,1546],{"class":725},[711,1579,746],{"class":725},[711,1581,1582],{"class":725}," \"",[711,1584,1431],{"class":901},[711,1586,1546],{"class":725},[711,1588,852],{"class":725},[711,1590,1591,1593,1596,1598,1600,1602,1605,1607],{"class":713,"line":883},[711,1592,1555],{"class":725},[711,1594,1595],{"class":1558},"provider",[711,1597,1546],{"class":725},[711,1599,746],{"class":725},[711,1601,1582],{"class":725},[711,1603,1604],{"class":901},"anthropic",[711,1606,1546],{"class":725},[711,1608,852],{"class":725},[711,1610,1611,1613,1616,1618,1620,1622,1625,1627],{"class":713,"line":931},[711,1612,1555],{"class":725},[711,1614,1615],{"class":1558},"finishReason",[711,1617,1546],{"class":725},[711,1619,746],{"class":725},[711,1621,1582],{"class":725},[711,1623,1624],{"class":901},"error",[711,1626,1546],{"class":725},[711,1628,852],{"class":725},[711,1630,1631,1633,1635,1637,1639,1641,1644],{"class":713,"line":940},[711,1632,1555],{"class":725},[711,1634,1624],{"class":1558},[711,1636,1546],{"class":725},[711,1638,746],{"class":725},[711,1640,1582],{"class":725},[711,1642,1643],{"class":901},"API rate limit exceeded",[711,1645,1646],{"class":725},"\"\n",[711,1648,1649],{"class":713,"line":946},[711,1650,1651],{"class":725},"  }\n",[711,1653,1654],{"class":713,"line":952},[711,1655,1656],{"class":725},"}\n",[544,1658,1659,1660,1663],{},"Stream errors (e.g. content filter) are also captured from the stream's error chunks. 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