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Install",[674,675,676,704,720,736],"code-group",{},[677,678,684],"pre",{"className":679,"code":680,"filename":681,"language":682,"meta":683,"style":683},"language-bash shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","pnpm add evlog eve\n","pnpm","bash","",[540,685,686],{"__ignoreMap":683},[687,688,691,694,698,701],"span",{"class":689,"line":690},"line",1,[687,692,681],{"class":693},"sBMFI",[687,695,697],{"class":696},"sfazB"," add",[687,699,700],{"class":696}," evlog",[687,702,703],{"class":696}," eve\n",[677,705,708],{"className":679,"code":706,"filename":707,"language":682,"meta":683,"style":683},"bun add evlog eve\n","bun",[540,709,710],{"__ignoreMap":683},[687,711,712,714,716,718],{"class":689,"line":690},[687,713,707],{"class":693},[687,715,697],{"class":696},[687,717,700],{"class":696},[687,719,703],{"class":696},[677,721,724],{"className":679,"code":722,"filename":723,"language":682,"meta":683,"style":683},"yarn add evlog eve\n","yarn",[540,725,726],{"__ignoreMap":683},[687,727,728,730,732,734],{"class":689,"line":690},[687,729,723],{"class":693},[687,731,697],{"class":696},[687,733,700],{"class":696},[687,735,703],{"class":696},[677,737,740],{"className":679,"code":738,"filename":739,"language":682,"meta":683,"style":683},"npm install evlog eve\n","npm",[540,741,742],{"__ignoreMap":683},[687,743,744,746,749,751],{"class":689,"line":690},[687,745,739],{"class":693},[687,747,748],{"class":696}," install",[687,750,700],{"class":696},[687,752,703],{"class":696},[669,754,756],{"id":755},"_2-add-the-hook","2. Add the hook",[521,758,759,760,763],{},"Create ",[540,761,762],{},"agent\u002Fhooks\u002Fevlog.ts",":",[677,765,769],{"className":766,"code":767,"filename":762,"language":768,"meta":683,"style":683},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","import { defineEvlogHook } from 'evlog\u002Feve'\nimport { createAxiomDrain } from 'evlog\u002Faxiom'\n\nexport default defineEvlogHook({\n  init: { env: { service: 'my-agent' } },\n  drain: createAxiomDrain(),\n  enrich: (ctx) => {\n    ctx.event.region = process.env.VERCEL_REGION\n  },\n})\n","typescript",[540,770,771,799,820,827,845,881,897,922,955,961],{"__ignoreMap":683},[687,772,773,777,781,785,788,791,794,796],{"class":689,"line":690},[687,774,776],{"class":775},"s7zQu","import",[687,778,780],{"class":779},"sMK4o"," {",[687,782,784],{"class":783},"sTEyZ"," defineEvlogHook",[687,786,787],{"class":779}," }",[687,789,790],{"class":775}," from",[687,792,793],{"class":779}," '",[687,795,546],{"class":696},[687,797,798],{"class":779},"'\n",[687,800,802,804,806,809,811,813,815,818],{"class":689,"line":801},2,[687,803,776],{"class":775},[687,805,780],{"class":779},[687,807,808],{"class":783}," createAxiomDrain",[687,810,787],{"class":779},[687,812,790],{"class":775},[687,814,793],{"class":779},[687,816,817],{"class":696},"evlog\u002Faxiom",[687,819,798],{"class":779},[687,821,823],{"class":689,"line":822},3,[687,824,826],{"emptyLinePlaceholder":825},true,"\n",[687,828,830,833,836,839,842],{"class":689,"line":829},4,[687,831,832],{"class":775},"export",[687,834,835],{"class":775}," default",[687,837,784],{"class":838},"s2Zo4",[687,840,841],{"class":783},"(",[687,843,844],{"class":779},"{\n",[687,846,848,852,854,856,859,861,863,866,868,870,873,876,878],{"class":689,"line":847},5,[687,849,851],{"class":850},"swJcz","  init",[687,853,763],{"class":779},[687,855,780],{"class":779},[687,857,858],{"class":850}," env",[687,860,763],{"class":779},[687,862,780],{"class":779},[687,864,865],{"class":850}," service",[687,867,763],{"class":779},[687,869,793],{"class":779},[687,871,872],{"class":696},"my-agent",[687,874,875],{"class":779},"'",[687,877,787],{"class":779},[687,879,880],{"class":779}," },\n",[687,882,884,887,889,891,894],{"class":689,"line":883},6,[687,885,886],{"class":850},"  drain",[687,888,763],{"class":779},[687,890,808],{"class":838},[687,892,893],{"class":783},"()",[687,895,896],{"class":779},",\n",[687,898,900,903,905,908,912,915,919],{"class":689,"line":899},7,[687,901,902],{"class":838},"  enrich",[687,904,763],{"class":779},[687,906,907],{"class":779}," (",[687,909,911],{"class":910},"sHdIc","ctx",[687,913,914],{"class":779},")",[687,916,918],{"class":917},"spNyl"," =>",[687,920,921],{"class":779}," {\n",[687,923,925,928,931,934,936,939,942,945,947,950,952],{"class":689,"line":924},8,[687,926,927],{"class":783},"    ctx",[687,929,930],{"class":779},".",[687,932,933],{"class":783},"event",[687,935,930],{"class":779},[687,937,938],{"class":783},"region",[687,940,941],{"class":779}," =",[687,943,944],{"class":783}," process",[687,946,930],{"class":779},[687,948,949],{"class":783},"env",[687,951,930],{"class":779},[687,953,954],{"class":783},"VERCEL_REGION\n",[687,956,958],{"class":689,"line":957},9,[687,959,960],{"class":779},"  },\n",[687,962,964,967],{"class":689,"line":963},10,[687,965,966],{"class":779},"}",[687,968,969],{"class":783},")\n",[521,971,972,973,976,977,980],{},"eve auto-discovers hook files under ",[540,974,975],{},"agent\u002Fhooks\u002F",". No HTTP middleware — the unit of work is an agent ",[531,978,979],{},"turn",", not a request.",[669,982,984],{"id":983},"_3-log-business-context-from-tools","3. Log business context from tools",[521,986,987,990,991,994,995,998,999,1002,1003,1006,1007,1010],{},[540,988,989],{},"defineEvlogHook()"," binds the turn logger via ",[531,992,993],{},"AsyncLocalStorage"," on ",[540,996,997],{},"turn.started",". Inside tool ",[540,1000,1001],{},"execute()"," handlers, call ",[540,1004,1005],{},"useLogger()"," with no arguments — same ergonomics as ",[540,1008,1009],{},"useLogger(event)"," in Nuxt or Hono.",[521,1012,1013,1014,1019],{},"In the ",[524,1015,1018],{"href":1016,"rel":1017},"https:\u002F\u002Fgithub.com\u002FHugoRCD\u002Fevlog\u002Ftree\u002Fmain\u002Fexamples\u002Feve",[528],"example agent",", support tools attach customer and order context as the agent works a refund:",[677,1021,1024],{"className":766,"code":1022,"filename":1023,"language":768,"meta":683,"style":683},"import { defineTool } from 'eve\u002Ftools'\nimport { useLogger } from 'evlog\u002Feve'\nimport { z } from 'zod'\n\nexport default defineTool({\n  description: 'Look up an order by id.',\n  inputSchema: z.object({ orderId: z.string() }),\n  async execute({ orderId }) {\n    const order = await fetchOrder(orderId)\n    const log = useLogger()\n    log.set({ order: { id: order.id, amount: order.amount, status: order.status } })\n    return order\n  },\n})\n","agent\u002Ftools\u002Flookup_order.ts",[540,1025,1026,1046,1065,1085,1089,1101,1117,1157,1175,1198,1212,1280,1289,1294],{"__ignoreMap":683},[687,1027,1028,1030,1032,1035,1037,1039,1041,1044],{"class":689,"line":690},[687,1029,776],{"class":775},[687,1031,780],{"class":779},[687,1033,1034],{"class":783}," defineTool",[687,1036,787],{"class":779},[687,1038,790],{"class":775},[687,1040,793],{"class":779},[687,1042,1043],{"class":696},"eve\u002Ftools",[687,1045,798],{"class":779},[687,1047,1048,1050,1052,1055,1057,1059,1061,1063],{"class":689,"line":801},[687,1049,776],{"class":775},[687,1051,780],{"class":779},[687,1053,1054],{"class":783}," useLogger",[687,1056,787],{"class":779},[687,1058,790],{"class":775},[687,1060,793],{"class":779},[687,1062,546],{"class":696},[687,1064,798],{"class":779},[687,1066,1067,1069,1071,1074,1076,1078,1080,1083],{"class":689,"line":822},[687,1068,776],{"class":775},[687,1070,780],{"class":779},[687,1072,1073],{"class":783}," z",[687,1075,787],{"class":779},[687,1077,790],{"class":775},[687,1079,793],{"class":779},[687,1081,1082],{"class":696},"zod",[687,1084,798],{"class":779},[687,1086,1087],{"class":689,"line":829},[687,1088,826],{"emptyLinePlaceholder":825},[687,1090,1091,1093,1095,1097,1099],{"class":689,"line":847},[687,1092,832],{"class":775},[687,1094,835],{"class":775},[687,1096,1034],{"class":838},[687,1098,841],{"class":783},[687,1100,844],{"class":779},[687,1102,1103,1106,1108,1110,1113,1115],{"class":689,"line":883},[687,1104,1105],{"class":850},"  description",[687,1107,763],{"class":779},[687,1109,793],{"class":779},[687,1111,1112],{"class":696},"Look up an order by id.",[687,1114,875],{"class":779},[687,1116,896],{"class":779},[687,1118,1119,1122,1124,1126,1128,1131,1133,1136,1139,1141,1143,1145,1148,1151,1153,1155],{"class":689,"line":899},[687,1120,1121],{"class":850},"  inputSchema",[687,1123,763],{"class":779},[687,1125,1073],{"class":783},[687,1127,930],{"class":779},[687,1129,1130],{"class":838},"object",[687,1132,841],{"class":783},[687,1134,1135],{"class":779},"{",[687,1137,1138],{"class":850}," orderId",[687,1140,763],{"class":779},[687,1142,1073],{"class":783},[687,1144,930],{"class":779},[687,1146,1147],{"class":838},"string",[687,1149,1150],{"class":783},"() ",[687,1152,966],{"class":779},[687,1154,914],{"class":783},[687,1156,896],{"class":779},[687,1158,1159,1162,1165,1168,1170,1173],{"class":689,"line":924},[687,1160,1161],{"class":917},"  async",[687,1163,1164],{"class":850}," execute",[687,1166,1167],{"class":779},"({",[687,1169,1138],{"class":910},[687,1171,1172],{"class":779}," })",[687,1174,921],{"class":779},[687,1176,1177,1180,1183,1185,1188,1191,1193,1196],{"class":689,"line":957},[687,1178,1179],{"class":917},"    const",[687,1181,1182],{"class":783}," order",[687,1184,941],{"class":779},[687,1186,1187],{"class":775}," await",[687,1189,1190],{"class":838}," fetchOrder",[687,1192,841],{"class":850},[687,1194,1195],{"class":783},"orderId",[687,1197,969],{"class":850},[687,1199,1200,1202,1205,1207,1209],{"class":689,"line":963},[687,1201,1179],{"class":917},[687,1203,1204],{"class":783}," log",[687,1206,941],{"class":779},[687,1208,1054],{"class":838},[687,1210,1211],{"class":850},"()\n",[687,1213,1215,1218,1220,1223,1225,1227,1229,1231,1233,1236,1238,1240,1242,1245,1248,1251,1253,1255,1257,1260,1262,1265,1267,1269,1271,1274,1276,1278],{"class":689,"line":1214},11,[687,1216,1217],{"class":783},"    log",[687,1219,930],{"class":779},[687,1221,1222],{"class":838},"set",[687,1224,841],{"class":850},[687,1226,1135],{"class":779},[687,1228,1182],{"class":850},[687,1230,763],{"class":779},[687,1232,780],{"class":779},[687,1234,1235],{"class":850}," id",[687,1237,763],{"class":779},[687,1239,1182],{"class":783},[687,1241,930],{"class":779},[687,1243,1244],{"class":783},"id",[687,1246,1247],{"class":779},",",[687,1249,1250],{"class":850}," amount",[687,1252,763],{"class":779},[687,1254,1182],{"class":783},[687,1256,930],{"class":779},[687,1258,1259],{"class":783},"amount",[687,1261,1247],{"class":779},[687,1263,1264],{"class":850}," status",[687,1266,763],{"class":779},[687,1268,1182],{"class":783},[687,1270,930],{"class":779},[687,1272,1273],{"class":783},"status",[687,1275,787],{"class":779},[687,1277,787],{"class":779},[687,1279,969],{"class":850},[687,1281,1283,1286],{"class":689,"line":1282},12,[687,1284,1285],{"class":775},"    return",[687,1287,1288],{"class":783}," order\n",[687,1290,1292],{"class":689,"line":1291},13,[687,1293,960],{"class":779},[687,1295,1297,1299],{"class":689,"line":1296},14,[687,1298,966],{"class":779},[687,1300,969],{"class":783},[553,1302,1304,1307,1308,1310,1311,1313,1314,1317,1318,1320],{"color":1303,"icon":131},"neutral",[531,1305,1306],{},"Fallback:"," if ",[540,1309,1005],{}," throws outside a turn, pass eve tool ",[540,1312,911],{},": ",[540,1315,1316],{},"useLogger(ctx)",". This covers separate hook\u002Ftool bundles or runtimes where AsyncLocalStorage does not propagate. With a standard eve agent layout and ",[540,1319,762],{}," registered, you should not need it.",[669,1322,1324],{"id":1323},"_4-nextjs-web-chat-optional","4. Next.js web chat (optional)",[521,1326,1327,1328,1331,1332,1335,1336,1339,1340,1335,1343,1346,1347,1350,1351,1354,1355,1358,1359,930],{},"Wrap ",[540,1329,1330],{},"next.config.ts"," with ",[540,1333,1334],{},"withEve()"," from ",[540,1337,1338],{},"eve\u002Fnext"," and use ",[540,1341,1342],{},"useEveAgent()",[540,1344,1345],{},"eve\u002Freact"," in your app. eve starts alongside ",[540,1348,1349],{},"next dev"," and proxies ",[540,1352,1353],{},"\u002Feve\u002Fv1\u002F*"," on the same origin — tool calls, approvals, and ",[540,1356,1357],{},"ask_question"," work out of the box. See the ",[524,1360,1018],{"href":1016,"rel":1361},[528],[607,1363,1365],{"id":1364},"wide-event-shape","Wide event shape",[521,1367,1368],{},"Each completed turn emits one event:",[677,1370,1375],{"className":1371,"code":1372,"filename":1373,"language":1374,"meta":683,"style":683},"language-json shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","{\n  \"method\": \"EVE\",\n  \"path\": \"\u002Fsessions\u002Fsess_abc\u002Fturns\u002Fturn_0\",\n  \"status\": 200,\n  \"duration\": \"7.9s\",\n  \"service\": \"clearbill-support-agent\",\n  \"eve\": {\n    \"sessionId\": \"sess_abc\",\n    \"turnId\": \"turn_0\",\n    \"turnSequence\": 0,\n    \"phase\": \"awaiting-approval\",\n    \"sessionTurns\": 1\n  },\n  \"customer\": { \"slug\": \"acme-corp\", \"plan\": \"enterprise\" },\n  \"order\": { \"id\": \"4821\", \"amount\": 890, \"currency\": \"USD\" },\n  \"approval\": { \"status\": \"pending\", \"tool\": \"issue_refund\" },\n  \"ai\": {\n    \"calls\": 2,\n    \"steps\": 2,\n    \"inputTokens\": 11724,\n    \"outputTokens\": 282,\n    \"finishReason\": \"tool-calls\",\n    \"tools\": [\n      { \"name\": \"lookup_customer\", \"durationMs\": 26, \"success\": true },\n      { \"name\": \"lookup_order\", \"durationMs\": 13, \"success\": true }\n    ]\n  }\n}\n","Wide Event — turn awaiting approval","json",[540,1376,1377,1381,1404,1424,1440,1460,1480,1492,1513,1533,1549,1569,1583,1587,1636,1698,1747,1761,1778,1794,1811,1828,1849,1864,1916,1964,1970,1976],{"__ignoreMap":683},[687,1378,1379],{"class":689,"line":690},[687,1380,844],{"class":779},[687,1382,1383,1386,1389,1392,1394,1397,1400,1402],{"class":689,"line":801},[687,1384,1385],{"class":779},"  \"",[687,1387,1388],{"class":917},"method",[687,1390,1391],{"class":779},"\"",[687,1393,763],{"class":779},[687,1395,1396],{"class":779}," 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 }\n",[687,1977,1979],{"class":689,"line":1978},28,[687,1980,1981],{"class":779},"}\n",[521,1983,1984],{},"After approval, the next turn carries the outcome:",[677,1986,1989],{"className":1371,"code":1987,"filename":1988,"language":1374,"meta":683,"style":683},"{\n  \"path\": \"\u002Fsessions\u002Fsess_abc\u002Fturns\u002Fturn_1\",\n  \"eve\": {\n    \"sessionId\": \"sess_abc\",\n    \"turnId\": \"turn_1\",\n    \"turnSequence\": 1,\n    \"sessionTurns\": 2\n  },\n  \"refund\": { \"orderId\": \"4821\", \"amount\": 890, \"status\": \"refunded\" },\n  \"audit\": { \"action\": \"refund.issued\", \"target\": { \"type\": \"order\", \"id\": \"4821\" } },\n  \"approval\": { \"status\": \"approved\", \"tool\": \"issue_refund\" },\n  \"ai\": {\n    \"tools\": [{ \"name\": \"issue_refund\", \"durationMs\": 993, \"success\": true }],\n    \"finishReason\": \"stop\"\n  }\n}\n","Wide Event — refund 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}],\n",[687,2343,2344,2346,2348,2350,2352,2354,2357],{"class":689,"line":1296},[687,2345,1496],{"class":779},[687,2347,1835],{"class":693},[687,2349,1391],{"class":779},[687,2351,763],{"class":779},[687,2353,1396],{"class":779},[687,2355,2356],{"class":696},"stop",[687,2358,2359],{"class":779},"\"\n",[687,2361,2362],{"class":689,"line":1638},[687,2363,1975],{"class":779},[687,2365,2366],{"class":689,"line":1700},[687,2367,1981],{"class":779},[521,2369,2370,2371,2374,2375,2374,2378,2381,2382,2384,2385,2388,2389,2392,2393,2396,2397,2374,2399,2374,2402,2405],{},"Token usage and tool executions are accumulated from eve stream events (",[540,2372,2373],{},"step.completed",", ",[540,2376,2377],{},"actions.requested",[540,2379,2380],{},"action.result","). Business fields set via ",[540,2383,1005],{}," carry across turns in the same session. Link turns in analytics with ",[540,2386,2387],{},"eve.sessionId"," + ",[540,2390,2391],{},"eve.turnSequence"," — each event stays self-contained. ",[540,2394,2395],{},"eve.phase"," is only set for non-routine endings (",[540,2398,1564],{},[540,2400,2401],{},"rejected",[540,2403,2404],{},"failed",").",[607,2407,2409],{"id":2408},"production","Production",[521,2411,2412],{},"Long-running eve agents should disable terminal pretty-printing and use a non-blocking drain:",[677,2414,2416],{"className":766,"code":2415,"filename":762,"language":768,"meta":683,"style":683},"import { defineEvlogHook } from 'evlog\u002Feve'\nimport { createAxiomDrain } from 'evlog\u002Faxiom'\nimport { createDrainPipeline } from 'evlog\u002Fpipeline'\n\nconst drain = createDrainPipeline({ batch: { size: 50, intervalMs: 5000 } })(\n  createAxiomDrain(),\n)\n\nexport default defineEvlogHook({\n  init: {\n    env: { service: 'my-agent', environment: 'production' },\n    pretty: false,\n    sampling: { rates: { info: 10 } },\n  },\n  drain,\n  maxSessions: 256,\n})\n",[540,2417,2418,2436,2454,2474,2478,2527,2536,2540,2544,2556,2564,2598,2611,2639,2643,2649,2661],{"__ignoreMap":683},[687,2419,2420,2422,2424,2426,2428,2430,2432,2434],{"class":689,"line":690},[687,2421,776],{"class":775},[687,2423,780],{"class":779},[687,2425,784],{"class":783},[687,2427,787],{"class":779},[687,2429,790],{"class":775},[687,2431,793],{"class":779},[687,2433,546],{"class":696},[687,2435,798],{"class":779},[687,2437,2438,2440,2442,2444,2446,2448,2450,2452],{"class":689,"line":801},[687,2439,776],{"class":775},[687,2441,780],{"class":779},[687,2443,808],{"class":783},[687,2445,787],{"class":779},[687,2447,790],{"class":775},[687,2449,793],{"class":779},[687,2451,817],{"class":696},[687,2453,798],{"class":779},[687,2455,2456,2458,2460,2463,2465,2467,2469,2472],{"class":689,"line":822},[687,2457,776],{"class":775},[687,2459,780],{"class":779},[687,2461,2462],{"class":783}," createDrainPipeline",[687,2464,787],{"class":779},[687,2466,790],{"class":775},[687,2468,793],{"class":779},[687,2470,2471],{"class":696},"evlog\u002Fpipeline",[687,2473,798],{"class":779},[687,2475,2476],{"class":689,"line":829},[687,2477,826],{"emptyLinePlaceholder":825},[687,2479,2480,2483,2486,2489,2491,2493,2495,2498,2500,2502,2505,2507,2510,2512,2515,2517,2520,2522,2524],{"class":689,"line":847},[687,2481,2482],{"class":917},"const",[687,2484,2485],{"class":783}," drain ",[687,2487,2488],{"class":779},"=",[687,2490,2462],{"class":838},[687,2492,841],{"class":783},[687,2494,1135],{"class":779},[687,2496,2497],{"class":850}," batch",[687,2499,763],{"class":779},[687,2501,780],{"class":779},[687,2503,2504],{"class":850}," size",[687,2506,763],{"class":779},[687,2508,2509],{"class":1436}," 50",[687,2511,1247],{"class":779},[687,2513,2514],{"class":850}," intervalMs",[687,2516,763],{"class":779},[687,2518,2519],{"class":1436}," 5000",[687,2521,787],{"class":779},[687,2523,787],{"class":779},[687,2525,2526],{"class":783},")(\n",[687,2528,2529,2532,2534],{"class":689,"line":883},[687,2530,2531],{"class":838},"  createAxiomDrain",[687,2533,893],{"class":783},[687,2535,896],{"class":779},[687,2537,2538],{"class":689,"line":899},[687,2539,969],{"class":783},[687,2541,2542],{"class":689,"line":924},[687,2543,826],{"emptyLinePlaceholder":825},[687,2545,2546,2548,2550,2552,2554],{"class":689,"line":957},[687,2547,832],{"class":775},[687,2549,835],{"class":775},[687,2551,784],{"class":838},[687,2553,841],{"class":783},[687,2555,844],{"class":779},[687,2557,2558,2560,2562],{"class":689,"line":963},[687,2559,851],{"class":850},[687,2561,763],{"class":779},[687,2563,921],{"class":779},[687,2565,2566,2569,2571,2573,2575,2577,2579,2581,2583,2585,2588,2590,2592,2594,2596],{"class":689,"line":1214},[687,2567,2568],{"class":850},"    env",[687,2570,763],{"class":779},[687,2572,780],{"class":779},[687,2574,865],{"class":850},[687,2576,763],{"class":779},[687,2578,793],{"class":779},[687,2580,872],{"class":696},[687,2582,875],{"class":779},[687,2584,1247],{"class":779},[687,2586,2587],{"class":850}," environment",[687,2589,763],{"class":779},[687,2591,793],{"class":779},[687,2593,2408],{"class":696},[687,2595,875],{"class":779},[687,2597,880],{"class":779},[687,2599,2600,2603,2605,2609],{"class":689,"line":1282},[687,2601,2602],{"class":850},"    pretty",[687,2604,763],{"class":779},[687,2606,2608],{"class":2607},"sfNiH"," false",[687,2610,896],{"class":779},[687,2612,2613,2616,2618,2620,2623,2625,2627,2630,2632,2635,2637],{"class":689,"line":1291},[687,2614,2615],{"class":850},"    sampling",[687,2617,763],{"class":779},[687,2619,780],{"class":779},[687,2621,2622],{"class":850}," rates",[687,2624,763],{"class":779},[687,2626,780],{"class":779},[687,2628,2629],{"class":850}," info",[687,2631,763],{"class":779},[687,2633,2634],{"class":1436}," 10",[687,2636,787],{"class":779},[687,2638,880],{"class":779},[687,2640,2641],{"class":689,"line":1296},[687,2642,960],{"class":779},[687,2644,2645,2647],{"class":689,"line":1638},[687,2646,886],{"class":783},[687,2648,896],{"class":779},[687,2650,2651,2654,2656,2659],{"class":689,"line":1700},[687,2652,2653],{"class":850},"  maxSessions",[687,2655,763],{"class":779},[687,2657,2658],{"class":1436}," 256",[687,2660,896],{"class":779},[687,2662,2663,2665],{"class":689,"line":1749},[687,2664,966],{"class":779},[687,2666,969],{"class":783},[612,2668,2669,2679],{},[615,2670,2671],{},[618,2672,2673,2676],{},[621,2674,2675],{},"Concern",[621,2677,2678],{},"Recommendation",[628,2680,2681,2692,2700,2711,2725],{},[618,2682,2683,2686],{},[633,2684,2685],{},"Terminal output",[633,2687,2688,2691],{},[540,2689,2690],{},"init.pretty: false"," — pretty-print is for local dev only",[618,2693,2694,2697],{},[633,2695,2696],{},"Drain latency",[633,2698,2699],{},"Batch or async HTTP drains; never block the turn on I\u002FO",[618,2701,2702,2705],{},[633,2703,2704],{},"Head sampling",[633,2706,2707,2710],{},[540,2708,2709],{},"init.sampling.rates"," — eve emits one event per turn, not per token",[618,2712,2713,2715],{},[633,2714,206],{},[633,2716,2717,2720,2721,2724],{},[540,2718,2719],{},"maxSessions"," (default ",[540,2722,2723],{},"256",") evicts oldest idle session state",[618,2726,2727,2730],{},[633,2728,2729],{},"Load",[633,2731,2732],{},"Hook handlers are O(1) per stream event; cost is dominated by your drain",[607,2734,326],{"id":2735},"options",[612,2737,2738,2748],{},[615,2739,2740],{},[618,2741,2742,2745],{},[621,2743,2744],{},"Option",[621,2746,2747],{},"Description",[628,2749,2750,2763,2785,2799,2822,2833],{},[618,2751,2752,2756],{},[633,2753,2754],{},[540,2755,89],{},[633,2757,2758,2759,2762],{},"Passed to ",[540,2760,2761],{},"initLogger()"," on first hook invocation",[618,2764,2765,2780],{},[633,2766,2767,2770,2771,2770,2774,2770,2777],{},[540,2768,2769],{},"drain"," \u002F ",[540,2772,2773],{},"enrich",[540,2775,2776],{},"keep",[540,2778,2779],{},"plugins",[633,2781,2782,2783,914],{},"Same as HTTP integrations (",[524,2784,2779],{"href":460},[618,2786,2787,2792],{},[633,2788,2789],{},[540,2790,2791],{},"redactMessage",[633,2793,2794,2795,2798],{},"Default ",[540,2796,2797],{},"true"," — omits user message text from the wide event",[618,2800,2801,2809],{},[633,2802,2803,2770,2806],{},[540,2804,2805],{},"cost",[540,2807,2808],{},"model",[633,2810,2811,2812,1335,2815,2818,2819],{},"Optional token pricing (",[540,2813,2814],{},"ModelCost",[540,2816,2817],{},"evlog\u002Fai",") → ",[540,2820,2821],{},"ai.estimatedCost",[618,2823,2824,2828],{},[633,2825,2826],{},[540,2827,2719],{},[633,2829,2830,2831,914],{},"In-memory session cap for context carry-over (default ",[540,2832,2723],{},[618,2834,2835,2843],{},[633,2836,2837,2770,2840],{},[540,2838,2839],{},"include",[540,2841,2842],{},"exclude",[633,2844,2845,2846,914],{},"Route-style filters on turn paths (",[540,2847,2848],{},"\u002Fsessions\u002F*\u002Fturns\u002F*",[607,2850,467],{"id":2851},"tail-sampling",[521,2853,2854,2855,2857],{},"Use ",[540,2856,2776],{}," to force-keep turns with failed tools or high token usage:",[677,2859,2861],{"className":766,"code":2860,"filename":762,"language":768,"meta":683,"style":683},"export default defineEvlogHook({\n  drain: createAxiomDrain(),\n  keep: (ctx) => {\n    const ai = ctx.context.ai as {\n      inputTokens?: number\n      outputTokens?: number\n      tools?: Array\u003C{ success: boolean }>\n    } | undefined\n    const totalTokens = (ai?.inputTokens ?? 0) + (ai?.outputTokens ?? 0)\n    if (totalTokens > 10_000) ctx.shouldKeep = true\n    if (ai?.tools?.some(t => !t.success)) ctx.shouldKeep = true\n  },\n})\n",[540,2862,2863,2875,2887,2904,2930,2941,2950,2974,2985,3028,3058,3104,3108],{"__ignoreMap":683},[687,2864,2865,2867,2869,2871,2873],{"class":689,"line":690},[687,2866,832],{"class":775},[687,2868,835],{"class":775},[687,2870,784],{"class":838},[687,2872,841],{"class":783},[687,2874,844],{"class":779},[687,2876,2877,2879,2881,2883,2885],{"class":689,"line":801},[687,2878,886],{"class":850},[687,2880,763],{"class":779},[687,2882,808],{"class":838},[687,2884,893],{"class":783},[687,2886,896],{"class":779},[687,2888,2889,2892,2894,2896,2898,2900,2902],{"class":689,"line":822},[687,2890,2891],{"class":838},"  keep",[687,2893,763],{"class":779},[687,2895,907],{"class":779},[687,2897,911],{"class":910},[687,2899,914],{"class":779},[687,2901,918],{"class":917},[687,2903,921],{"class":779},[687,2905,2906,2908,2911,2913,2916,2918,2921,2923,2925,2928],{"class":689,"line":829},[687,2907,1179],{"class":917},[687,2909,2910],{"class":783}," ai",[687,2912,941],{"class":779},[687,2914,2915],{"class":783}," ctx",[687,2917,930],{"class":779},[687,2919,2920],{"class":783},"context",[687,2922,930],{"class":779},[687,2924,1754],{"class":783},[687,2926,2927],{"class":775}," as",[687,2929,921],{"class":779},[687,2931,2932,2935,2938],{"class":689,"line":847},[687,2933,2934],{"class":850},"      inputTokens",[687,2936,2937],{"class":779},"?:",[687,2939,2940],{"class":693}," number\n",[687,2942,2943,2946,2948],{"class":689,"line":883},[687,2944,2945],{"class":850},"      outputTokens",[687,2947,2937],{"class":779},[687,2949,2940],{"class":693},[687,2951,2952,2955,2957,2960,2963,2966,2968,2971],{"class":689,"line":899},[687,2953,2954],{"class":850},"      tools",[687,2956,2937],{"class":779},[687,2958,2959],{"class":693}," Array",[687,2961,2962],{"class":779},"\u003C{",[687,2964,2965],{"class":850}," success",[687,2967,763],{"class":779},[687,2969,2970],{"class":693}," boolean",[687,2972,2973],{"class":779}," }>\n",[687,2975,2976,2979,2982],{"class":689,"line":924},[687,2977,2978],{"class":779},"    }",[687,2980,2981],{"class":779}," |",[687,2983,2984],{"class":693}," undefined\n",[687,2986,2987,2989,2992,2994,2996,2998,3001,3003,3006,3008,3011,3014,3016,3018,3020,3022,3024,3026],{"class":689,"line":957},[687,2988,1179],{"class":917},[687,2990,2991],{"class":783}," totalTokens",[687,2993,941],{"class":779},[687,2995,907],{"class":850},[687,2997,1754],{"class":783},[687,2999,3000],{"class":779},"?.",[687,3002,1801],{"class":783},[687,3004,3005],{"class":779}," ??",[687,3007,1546],{"class":1436},[687,3009,3010],{"class":850},") ",[687,3012,3013],{"class":779},"+",[687,3015,907],{"class":850},[687,3017,1754],{"class":783},[687,3019,3000],{"class":779},[687,3021,1818],{"class":783},[687,3023,3005],{"class":779},[687,3025,1546],{"class":1436},[687,3027,969],{"class":850},[687,3029,3030,3033,3035,3038,3041,3044,3046,3048,3050,3053,3055],{"class":689,"line":963},[687,3031,3032],{"class":775},"    if",[687,3034,907],{"class":850},[687,3036,3037],{"class":783},"totalTokens",[687,3039,3040],{"class":779}," >",[687,3042,3043],{"class":1436}," 10_000",[687,3045,3010],{"class":850},[687,3047,911],{"class":783},[687,3049,930],{"class":779},[687,3051,3052],{"class":783},"shouldKeep",[687,3054,941],{"class":779},[687,3056,3057],{"class":2607}," true\n",[687,3059,3060,3062,3064,3066,3068,3070,3072,3075,3077,3080,3082,3085,3087,3089,3091,3094,3096,3098,3100,3102],{"class":689,"line":1214},[687,3061,3032],{"class":775},[687,3063,907],{"class":850},[687,3065,1754],{"class":783},[687,3067,3000],{"class":779},[687,3069,1856],{"class":783},[687,3071,3000],{"class":779},[687,3073,3074],{"class":838},"some",[687,3076,841],{"class":850},[687,3078,3079],{"class":910},"t",[687,3081,918],{"class":917},[687,3083,3084],{"class":779}," !",[687,3086,3079],{"class":783},[687,3088,930],{"class":779},[687,3090,1906],{"class":783},[687,3092,3093],{"class":850},")) ",[687,3095,911],{"class":783},[687,3097,930],{"class":779},[687,3099,3052],{"class":783},[687,3101,941],{"class":779},[687,3103,3057],{"class":2607},[687,3105,3106],{"class":689,"line":1282},[687,3107,960],{"class":779},[687,3109,3110,3112],{"class":689,"line":1291},[687,3111,966],{"class":779},[687,3113,969],{"class":783},[607,3115,3117],{"id":3116},"audit-logs","Audit logs",[521,3119,3120,3121,3123,3124,3127,3128,3131,3132,3135,3136,1331,3138,930],{},"Combine with ",[524,3122,368],{"href":374},": register ",[540,3125,3126],{},"auditEnricher()"," via ",[540,3129,3130],{},"init.plugins"," or a global plugin, and call ",[540,3133,3134],{},"log.audit()"," inside tools when a human approval gate fires. Tool rejections surface on ",[540,3137,2380],{},[540,3139,3140],{},"status: \"rejected\"",[607,3142,3144],{"id":3143},"run-locally","Run locally",[677,3146,3148],{"className":679,"code":3147,"language":682,"meta":683,"style":683},"git clone https:\u002F\u002Fgithub.com\u002FHugoRCD\u002Fevlog\ncd evlog\npnpm install\npnpm example eve\n",[540,3149,3150,3161,3169,3176],{"__ignoreMap":683},[687,3151,3152,3155,3158],{"class":689,"line":690},[687,3153,3154],{"class":693},"git",[687,3156,3157],{"class":696}," clone",[687,3159,3160],{"class":696}," https:\u002F\u002Fgithub.com\u002FHugoRCD\u002Fevlog\n",[687,3162,3163,3166],{"class":689,"line":801},[687,3164,3165],{"class":838},"cd",[687,3167,3168],{"class":696}," evlog\n",[687,3170,3171,3173],{"class":689,"line":822},[687,3172,681],{"class":693},[687,3174,3175],{"class":696}," install\n",[687,3177,3178,3180,3183],{"class":689,"line":829},[687,3179,681],{"class":693},[687,3181,3182],{"class":696}," example",[687,3184,703],{"class":696},[521,3186,3187,3188,3191,3192,3195,3196,3199,3200,3206],{},"The ",[540,3189,3190],{},"examples\u002Feve"," project is a ",[531,3193,3194],{},"support refund copilot"," (Clearbill SaaS): lookup customer → lookup order → issue refund, with eve approvals when amount > $100. Run ",[540,3197,3198],{},"pnpm example eve",", open ",[531,3201,3202],{},[524,3203,3204],{"href":3204,"rel":3205},"http:\u002F\u002Flocalhost:3000",[528],", and click a starter prompt.",[607,3208,3210],{"id":3209},"what-to-read-next","What to read next",[573,3212,3213,3221,3229,3235],{},[576,3214,3215,3220],{},[524,3216,3219],{"href":3217,"rel":3218},"https:\u002F\u002Feve.dev\u002Fdocs\u002Fguides\u002Fhooks",[528],"eve hooks guide"," — stream event vocabulary",[576,3222,3223,3228],{},[524,3224,3227],{"href":3225,"rel":3226},"https:\u002F\u002Feve.dev\u002Fdocs\u002Fguides\u002Finstrumentation",[528],"eve instrumentation"," — OTel spans (complementary)",[576,3230,3231,3234],{},[524,3232,3233],{"href":318},"AI SDK use case"," — when you own the model loop directly",[576,3236,3237,3240],{},[524,3238,3239],{"href":138},"Adapters overview"," — drain destinations",[3242,3243,3244],"style",{},"html pre.shiki code .sBMFI, html code.shiki .sBMFI{--shiki-light:#E2931D;--shiki-default:#FFCB6B;--shiki-dark:#FFCB6B}html pre.shiki code .sfazB, html code.shiki .sfazB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}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 .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 .sMK4o, html code.shiki .sMK4o{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .sTEyZ, html code.shiki .sTEyZ{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}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 .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 .spNyl, html code.shiki .spNyl{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .sbssI, html code.shiki .sbssI{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}html pre.shiki code .sfNiH, html code.shiki .sfNiH{--shiki-light:#FF5370;--shiki-default:#FF9CAC;--shiki-dark:#FF9CAC}",{"title":683,"searchDepth":801,"depth":801,"links":3246},[3247,3248,3254,3255,3256,3257,3258,3259,3260],{"id":609,"depth":801,"text":610},{"id":667,"depth":801,"text":25,"children":3249},[3250,3251,3252,3253],{"id":671,"depth":822,"text":672},{"id":755,"depth":822,"text":756},{"id":983,"depth":822,"text":984},{"id":1323,"depth":822,"text":1324},{"id":1364,"depth":801,"text":1365},{"id":2408,"depth":801,"text":2409},{"id":2735,"depth":801,"text":326},{"id":2851,"depth":801,"text":467},{"id":3116,"depth":801,"text":3117},{"id":3143,"depth":801,"text":3144},{"id":3209,"depth":801,"text":3210},"Export one evlog wide event per eve agent turn — token usage, tool executions, business context, drains, enrichers, and tail sampling alongside Agent Runs and OpenTelemetry.","md",[3264],{"label":3265,"icon":3266,"to":1016,"color":1303,"variant":3267},"Source Code","i-simple-icons-github","subtle",{},{"title":426,"icon":429},{"title":426,"description":3261},"u7Qzmbz2Nso_LAdQ68wPgxOd5CVecwsxKsswChCSofE",[3273,3275],{"title":421,"path":422,"stem":423,"description":3274,"icon":424,"children":-1},"Add derived context to every wide event automatically — user agent, geo, request size, and trace context. 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