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Install",[679,680,681,709,725,741],"code-group",{},[682,683,689],"pre",{"className":684,"code":685,"filename":686,"language":687,"meta":688,"style":688},"language-bash shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","pnpm add evlog eve\n","pnpm","bash","",[545,690,691],{"__ignoreMap":688},[692,693,696,699,703,706],"span",{"class":694,"line":695},"line",1,[692,697,686],{"class":698},"sBMFI",[692,700,702],{"class":701},"sfazB"," add",[692,704,705],{"class":701}," evlog",[692,707,708],{"class":701}," eve\n",[682,710,713],{"className":684,"code":711,"filename":712,"language":687,"meta":688,"style":688},"bun add evlog eve\n","bun",[545,714,715],{"__ignoreMap":688},[692,716,717,719,721,723],{"class":694,"line":695},[692,718,712],{"class":698},[692,720,702],{"class":701},[692,722,705],{"class":701},[692,724,708],{"class":701},[682,726,729],{"className":684,"code":727,"filename":728,"language":687,"meta":688,"style":688},"yarn add evlog eve\n","yarn",[545,730,731],{"__ignoreMap":688},[692,732,733,735,737,739],{"class":694,"line":695},[692,734,728],{"class":698},[692,736,702],{"class":701},[692,738,705],{"class":701},[692,740,708],{"class":701},[682,742,745],{"className":684,"code":743,"filename":744,"language":687,"meta":688,"style":688},"npm install evlog eve\n","npm",[545,746,747],{"__ignoreMap":688},[692,748,749,751,754,756],{"class":694,"line":695},[692,750,744],{"class":698},[692,752,753],{"class":701}," install",[692,755,705],{"class":701},[692,757,708],{"class":701},[674,759,761],{"id":760},"_2-add-the-hook","2. Add the hook",[526,763,764,765,768],{},"Create ",[545,766,767],{},"agent\u002Fhooks\u002Fevlog.ts",":",[682,770,774],{"className":771,"code":772,"filename":767,"language":773,"meta":688,"style":688},"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",[545,775,776,804,825,832,850,886,902,927,960,966],{"__ignoreMap":688},[692,777,778,782,786,790,793,796,799,801],{"class":694,"line":695},[692,779,781],{"class":780},"s7zQu","import",[692,783,785],{"class":784},"sMK4o"," {",[692,787,789],{"class":788},"sTEyZ"," defineEvlogHook",[692,791,792],{"class":784}," }",[692,794,795],{"class":780}," from",[692,797,798],{"class":784}," '",[692,800,551],{"class":701},[692,802,803],{"class":784},"'\n",[692,805,807,809,811,814,816,818,820,823],{"class":694,"line":806},2,[692,808,781],{"class":780},[692,810,785],{"class":784},[692,812,813],{"class":788}," createAxiomDrain",[692,815,792],{"class":784},[692,817,795],{"class":780},[692,819,798],{"class":784},[692,821,822],{"class":701},"evlog\u002Faxiom",[692,824,803],{"class":784},[692,826,828],{"class":694,"line":827},3,[692,829,831],{"emptyLinePlaceholder":830},true,"\n",[692,833,835,838,841,844,847],{"class":694,"line":834},4,[692,836,837],{"class":780},"export",[692,839,840],{"class":780}," default",[692,842,789],{"class":843},"s2Zo4",[692,845,846],{"class":788},"(",[692,848,849],{"class":784},"{\n",[692,851,853,857,859,861,864,866,868,871,873,875,878,881,883],{"class":694,"line":852},5,[692,854,856],{"class":855},"swJcz","  init",[692,858,768],{"class":784},[692,860,785],{"class":784},[692,862,863],{"class":855}," env",[692,865,768],{"class":784},[692,867,785],{"class":784},[692,869,870],{"class":855}," service",[692,872,768],{"class":784},[692,874,798],{"class":784},[692,876,877],{"class":701},"my-agent",[692,879,880],{"class":784},"'",[692,882,792],{"class":784},[692,884,885],{"class":784}," },\n",[692,887,889,892,894,896,899],{"class":694,"line":888},6,[692,890,891],{"class":855},"  drain",[692,893,768],{"class":784},[692,895,813],{"class":843},[692,897,898],{"class":788},"()",[692,900,901],{"class":784},",\n",[692,903,905,908,910,913,917,920,924],{"class":694,"line":904},7,[692,906,907],{"class":843},"  enrich",[692,909,768],{"class":784},[692,911,912],{"class":784}," (",[692,914,916],{"class":915},"sHdIc","ctx",[692,918,919],{"class":784},")",[692,921,923],{"class":922},"spNyl"," =>",[692,925,926],{"class":784}," {\n",[692,928,930,933,936,939,941,944,947,950,952,955,957],{"class":694,"line":929},8,[692,931,932],{"class":788},"    ctx",[692,934,935],{"class":784},".",[692,937,938],{"class":788},"event",[692,940,935],{"class":784},[692,942,943],{"class":788},"region",[692,945,946],{"class":784}," =",[692,948,949],{"class":788}," process",[692,951,935],{"class":784},[692,953,954],{"class":788},"env",[692,956,935],{"class":784},[692,958,959],{"class":788},"VERCEL_REGION\n",[692,961,963],{"class":694,"line":962},9,[692,964,965],{"class":784},"  },\n",[692,967,969,972],{"class":694,"line":968},10,[692,970,971],{"class":784},"}",[692,973,974],{"class":788},")\n",[526,976,977,978,981,982,985],{},"eve auto-discovers hook files under ",[545,979,980],{},"agent\u002Fhooks\u002F",". No HTTP middleware — the unit of work is an agent ",[536,983,984],{},"turn",", not a request.",[674,987,989],{"id":988},"_3-log-business-context-from-tools","3. Log business context from tools",[526,991,992,995,996,999,1000,1003,1004,1007,1008,1011,1012,1015],{},[545,993,994],{},"defineEvlogHook()"," binds the turn logger via ",[536,997,998],{},"AsyncLocalStorage"," on ",[545,1001,1002],{},"turn.started",". Inside tool ",[545,1005,1006],{},"execute()"," handlers, call ",[545,1009,1010],{},"useLogger()"," with no arguments — same ergonomics as ",[545,1013,1014],{},"useLogger(event)"," in Nuxt or Hono.",[526,1017,1018,1019,1024],{},"In the ",[529,1020,1023],{"href":1021,"rel":1022},"https:\u002F\u002Fgithub.com\u002FHugoRCD\u002Fevlog\u002Ftree\u002Fmain\u002Fexamples\u002Feve",[533],"example agent",", support tools attach customer and order context as the agent works a refund:",[682,1026,1029],{"className":771,"code":1027,"filename":1028,"language":773,"meta":688,"style":688},"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",[545,1030,1031,1051,1070,1090,1094,1106,1122,1162,1180,1203,1217,1285,1294,1299],{"__ignoreMap":688},[692,1032,1033,1035,1037,1040,1042,1044,1046,1049],{"class":694,"line":695},[692,1034,781],{"class":780},[692,1036,785],{"class":784},[692,1038,1039],{"class":788}," defineTool",[692,1041,792],{"class":784},[692,1043,795],{"class":780},[692,1045,798],{"class":784},[692,1047,1048],{"class":701},"eve\u002Ftools",[692,1050,803],{"class":784},[692,1052,1053,1055,1057,1060,1062,1064,1066,1068],{"class":694,"line":806},[692,1054,781],{"class":780},[692,1056,785],{"class":784},[692,1058,1059],{"class":788}," useLogger",[692,1061,792],{"class":784},[692,1063,795],{"class":780},[692,1065,798],{"class":784},[692,1067,551],{"class":701},[692,1069,803],{"class":784},[692,1071,1072,1074,1076,1079,1081,1083,1085,1088],{"class":694,"line":827},[692,1073,781],{"class":780},[692,1075,785],{"class":784},[692,1077,1078],{"class":788}," z",[692,1080,792],{"class":784},[692,1082,795],{"class":780},[692,1084,798],{"class":784},[692,1086,1087],{"class":701},"zod",[692,1089,803],{"class":784},[692,1091,1092],{"class":694,"line":834},[692,1093,831],{"emptyLinePlaceholder":830},[692,1095,1096,1098,1100,1102,1104],{"class":694,"line":852},[692,1097,837],{"class":780},[692,1099,840],{"class":780},[692,1101,1039],{"class":843},[692,1103,846],{"class":788},[692,1105,849],{"class":784},[692,1107,1108,1111,1113,1115,1118,1120],{"class":694,"line":888},[692,1109,1110],{"class":855},"  description",[692,1112,768],{"class":784},[692,1114,798],{"class":784},[692,1116,1117],{"class":701},"Look up an order by id.",[692,1119,880],{"class":784},[692,1121,901],{"class":784},[692,1123,1124,1127,1129,1131,1133,1136,1138,1141,1144,1146,1148,1150,1153,1156,1158,1160],{"class":694,"line":904},[692,1125,1126],{"class":855},"  inputSchema",[692,1128,768],{"class":784},[692,1130,1078],{"class":788},[692,1132,935],{"class":784},[692,1134,1135],{"class":843},"object",[692,1137,846],{"class":788},[692,1139,1140],{"class":784},"{",[692,1142,1143],{"class":855}," orderId",[692,1145,768],{"class":784},[692,1147,1078],{"class":788},[692,1149,935],{"class":784},[692,1151,1152],{"class":843},"string",[692,1154,1155],{"class":788},"() ",[692,1157,971],{"class":784},[692,1159,919],{"class":788},[692,1161,901],{"class":784},[692,1163,1164,1167,1170,1173,1175,1178],{"class":694,"line":929},[692,1165,1166],{"class":922},"  async",[692,1168,1169],{"class":855}," execute",[692,1171,1172],{"class":784},"({",[692,1174,1143],{"class":915},[692,1176,1177],{"class":784}," })",[692,1179,926],{"class":784},[692,1181,1182,1185,1188,1190,1193,1196,1198,1201],{"class":694,"line":962},[692,1183,1184],{"class":922},"    const",[692,1186,1187],{"class":788}," order",[692,1189,946],{"class":784},[692,1191,1192],{"class":780}," await",[692,1194,1195],{"class":843}," fetchOrder",[692,1197,846],{"class":855},[692,1199,1200],{"class":788},"orderId",[692,1202,974],{"class":855},[692,1204,1205,1207,1210,1212,1214],{"class":694,"line":968},[692,1206,1184],{"class":922},[692,1208,1209],{"class":788}," log",[692,1211,946],{"class":784},[692,1213,1059],{"class":843},[692,1215,1216],{"class":855},"()\n",[692,1218,1220,1223,1225,1228,1230,1232,1234,1236,1238,1241,1243,1245,1247,1250,1253,1256,1258,1260,1262,1265,1267,1270,1272,1274,1276,1279,1281,1283],{"class":694,"line":1219},11,[692,1221,1222],{"class":788},"    log",[692,1224,935],{"class":784},[692,1226,1227],{"class":843},"set",[692,1229,846],{"class":855},[692,1231,1140],{"class":784},[692,1233,1187],{"class":855},[692,1235,768],{"class":784},[692,1237,785],{"class":784},[692,1239,1240],{"class":855}," id",[692,1242,768],{"class":784},[692,1244,1187],{"class":788},[692,1246,935],{"class":784},[692,1248,1249],{"class":788},"id",[692,1251,1252],{"class":784},",",[692,1254,1255],{"class":855}," amount",[692,1257,768],{"class":784},[692,1259,1187],{"class":788},[692,1261,935],{"class":784},[692,1263,1264],{"class":788},"amount",[692,1266,1252],{"class":784},[692,1268,1269],{"class":855}," status",[692,1271,768],{"class":784},[692,1273,1187],{"class":788},[692,1275,935],{"class":784},[692,1277,1278],{"class":788},"status",[692,1280,792],{"class":784},[692,1282,792],{"class":784},[692,1284,974],{"class":855},[692,1286,1288,1291],{"class":694,"line":1287},12,[692,1289,1290],{"class":780},"    return",[692,1292,1293],{"class":788}," order\n",[692,1295,1297],{"class":694,"line":1296},13,[692,1298,965],{"class":784},[692,1300,1302,1304],{"class":694,"line":1301},14,[692,1303,971],{"class":784},[692,1305,974],{"class":788},[558,1307,1309,1312,1313,1315,1316,1318,1319,1322,1323,1325],{"color":1308,"icon":131},"neutral",[536,1310,1311],{},"Fallback:"," if ",[545,1314,1010],{}," throws outside a turn, pass eve tool ",[545,1317,916],{},": ",[545,1320,1321],{},"useLogger(ctx)",". This covers separate hook\u002Ftool bundles or runtimes where AsyncLocalStorage does not propagate. With a standard eve agent layout and ",[545,1324,767],{}," registered, you should not need it.",[674,1327,1329],{"id":1328},"_4-nextjs-web-chat-optional","4. Next.js web chat (optional)",[526,1331,1332,1333,1336,1337,1340,1341,1344,1345,1340,1348,1351,1352,1355,1356,1359,1360,1363,1364,935],{},"Wrap ",[545,1334,1335],{},"next.config.ts"," with ",[545,1338,1339],{},"withEve()"," from ",[545,1342,1343],{},"eve\u002Fnext"," and use ",[545,1346,1347],{},"useEveAgent()",[545,1349,1350],{},"eve\u002Freact"," in your app. eve starts alongside ",[545,1353,1354],{},"next dev"," and proxies ",[545,1357,1358],{},"\u002Feve\u002Fv1\u002F*"," on the same origin — tool calls, approvals, and ",[545,1361,1362],{},"ask_question"," work out of the box. See the ",[529,1365,1023],{"href":1021,"rel":1366},[533],[612,1368,1370],{"id":1369},"wide-event-shape","Wide event shape",[526,1372,1373],{},"Each completed turn emits one event:",[682,1375,1380],{"className":1376,"code":1377,"filename":1378,"language":1379,"meta":688,"style":688},"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",[545,1381,1382,1386,1409,1429,1445,1465,1485,1497,1518,1538,1554,1574,1588,1592,1641,1703,1752,1766,1783,1799,1816,1833,1854,1869,1921,1969,1975,1981],{"__ignoreMap":688},[692,1383,1384],{"class":694,"line":695},[692,1385,849],{"class":784},[692,1387,1388,1391,1394,1397,1399,1402,1405,1407],{"class":694,"line":806},[692,1389,1390],{"class":784},"  \"",[692,1392,1393],{"class":922},"method",[692,1395,1396],{"class":784},"\"",[692,1398,768],{"class":784},[692,1400,1401],{"class":784}," 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}],\n",[692,2348,2349,2351,2353,2355,2357,2359,2362],{"class":694,"line":1301},[692,2350,1501],{"class":784},[692,2352,1840],{"class":698},[692,2354,1396],{"class":784},[692,2356,768],{"class":784},[692,2358,1401],{"class":784},[692,2360,2361],{"class":701},"stop",[692,2363,2364],{"class":784},"\"\n",[692,2366,2367],{"class":694,"line":1643},[692,2368,1980],{"class":784},[692,2370,2371],{"class":694,"line":1705},[692,2372,1986],{"class":784},[526,2374,2375,2376,2379,2380,2379,2383,2386,2387,2389,2390,2393,2394,2397,2398,2401,2402,2379,2404,2379,2407,2410],{},"Token usage and tool executions are accumulated from eve stream events (",[545,2377,2378],{},"step.completed",", ",[545,2381,2382],{},"actions.requested",[545,2384,2385],{},"action.result","). Business fields set via ",[545,2388,1010],{}," carry across turns in the same session. Link turns in analytics with ",[545,2391,2392],{},"eve.sessionId"," + ",[545,2395,2396],{},"eve.turnSequence"," — each event stays self-contained. ",[545,2399,2400],{},"eve.phase"," is only set for non-routine endings (",[545,2403,1569],{},[545,2405,2406],{},"rejected",[545,2408,2409],{},"failed",").",[612,2412,2414],{"id":2413},"production","Production",[526,2416,2417],{},"Long-running eve agents should disable terminal pretty-printing and use a non-blocking drain:",[682,2419,2421],{"className":771,"code":2420,"filename":767,"language":773,"meta":688,"style":688},"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",[545,2422,2423,2441,2459,2479,2483,2532,2541,2545,2549,2561,2569,2603,2616,2644,2648,2654,2666],{"__ignoreMap":688},[692,2424,2425,2427,2429,2431,2433,2435,2437,2439],{"class":694,"line":695},[692,2426,781],{"class":780},[692,2428,785],{"class":784},[692,2430,789],{"class":788},[692,2432,792],{"class":784},[692,2434,795],{"class":780},[692,2436,798],{"class":784},[692,2438,551],{"class":701},[692,2440,803],{"class":784},[692,2442,2443,2445,2447,2449,2451,2453,2455,2457],{"class":694,"line":806},[692,2444,781],{"class":780},[692,2446,785],{"class":784},[692,2448,813],{"class":788},[692,2450,792],{"class":784},[692,2452,795],{"class":780},[692,2454,798],{"class":784},[692,2456,822],{"class":701},[692,2458,803],{"class":784},[692,2460,2461,2463,2465,2468,2470,2472,2474,2477],{"class":694,"line":827},[692,2462,781],{"class":780},[692,2464,785],{"class":784},[692,2466,2467],{"class":788}," createDrainPipeline",[692,2469,792],{"class":784},[692,2471,795],{"class":780},[692,2473,798],{"class":784},[692,2475,2476],{"class":701},"evlog\u002Fpipeline",[692,2478,803],{"class":784},[692,2480,2481],{"class":694,"line":834},[692,2482,831],{"emptyLinePlaceholder":830},[692,2484,2485,2488,2491,2494,2496,2498,2500,2503,2505,2507,2510,2512,2515,2517,2520,2522,2525,2527,2529],{"class":694,"line":852},[692,2486,2487],{"class":922},"const",[692,2489,2490],{"class":788}," drain ",[692,2492,2493],{"class":784},"=",[692,2495,2467],{"class":843},[692,2497,846],{"class":788},[692,2499,1140],{"class":784},[692,2501,2502],{"class":855}," batch",[692,2504,768],{"class":784},[692,2506,785],{"class":784},[692,2508,2509],{"class":855}," size",[692,2511,768],{"class":784},[692,2513,2514],{"class":1441}," 50",[692,2516,1252],{"class":784},[692,2518,2519],{"class":855}," intervalMs",[692,2521,768],{"class":784},[692,2523,2524],{"class":1441}," 5000",[692,2526,792],{"class":784},[692,2528,792],{"class":784},[692,2530,2531],{"class":788},")(\n",[692,2533,2534,2537,2539],{"class":694,"line":888},[692,2535,2536],{"class":843},"  createAxiomDrain",[692,2538,898],{"class":788},[692,2540,901],{"class":784},[692,2542,2543],{"class":694,"line":904},[692,2544,974],{"class":788},[692,2546,2547],{"class":694,"line":929},[692,2548,831],{"emptyLinePlaceholder":830},[692,2550,2551,2553,2555,2557,2559],{"class":694,"line":962},[692,2552,837],{"class":780},[692,2554,840],{"class":780},[692,2556,789],{"class":843},[692,2558,846],{"class":788},[692,2560,849],{"class":784},[692,2562,2563,2565,2567],{"class":694,"line":968},[692,2564,856],{"class":855},[692,2566,768],{"class":784},[692,2568,926],{"class":784},[692,2570,2571,2574,2576,2578,2580,2582,2584,2586,2588,2590,2593,2595,2597,2599,2601],{"class":694,"line":1219},[692,2572,2573],{"class":855},"    env",[692,2575,768],{"class":784},[692,2577,785],{"class":784},[692,2579,870],{"class":855},[692,2581,768],{"class":784},[692,2583,798],{"class":784},[692,2585,877],{"class":701},[692,2587,880],{"class":784},[692,2589,1252],{"class":784},[692,2591,2592],{"class":855}," environment",[692,2594,768],{"class":784},[692,2596,798],{"class":784},[692,2598,2413],{"class":701},[692,2600,880],{"class":784},[692,2602,885],{"class":784},[692,2604,2605,2608,2610,2614],{"class":694,"line":1287},[692,2606,2607],{"class":855},"    pretty",[692,2609,768],{"class":784},[692,2611,2613],{"class":2612},"sfNiH"," false",[692,2615,901],{"class":784},[692,2617,2618,2621,2623,2625,2628,2630,2632,2635,2637,2640,2642],{"class":694,"line":1296},[692,2619,2620],{"class":855},"    sampling",[692,2622,768],{"class":784},[692,2624,785],{"class":784},[692,2626,2627],{"class":855}," rates",[692,2629,768],{"class":784},[692,2631,785],{"class":784},[692,2633,2634],{"class":855}," info",[692,2636,768],{"class":784},[692,2638,2639],{"class":1441}," 10",[692,2641,792],{"class":784},[692,2643,885],{"class":784},[692,2645,2646],{"class":694,"line":1301},[692,2647,965],{"class":784},[692,2649,2650,2652],{"class":694,"line":1643},[692,2651,891],{"class":788},[692,2653,901],{"class":784},[692,2655,2656,2659,2661,2664],{"class":694,"line":1705},[692,2657,2658],{"class":855},"  maxSessions",[692,2660,768],{"class":784},[692,2662,2663],{"class":1441}," 256",[692,2665,901],{"class":784},[692,2667,2668,2670],{"class":694,"line":1754},[692,2669,971],{"class":784},[692,2671,974],{"class":788},[617,2673,2674,2684],{},[620,2675,2676],{},[623,2677,2678,2681],{},[626,2679,2680],{},"Concern",[626,2682,2683],{},"Recommendation",[633,2685,2686,2697,2705,2716,2730],{},[623,2687,2688,2691],{},[638,2689,2690],{},"Terminal output",[638,2692,2693,2696],{},[545,2694,2695],{},"init.pretty: false"," — pretty-print is for local dev only",[623,2698,2699,2702],{},[638,2700,2701],{},"Drain latency",[638,2703,2704],{},"Batch or async HTTP drains; never block the turn on I\u002FO",[623,2706,2707,2710],{},[638,2708,2709],{},"Head sampling",[638,2711,2712,2715],{},[545,2713,2714],{},"init.sampling.rates"," — eve emits one event per turn, not per token",[623,2717,2718,2720],{},[638,2719,211],{},[638,2721,2722,2725,2726,2729],{},[545,2723,2724],{},"maxSessions"," (default ",[545,2727,2728],{},"256",") evicts oldest idle session state",[623,2731,2732,2735],{},[638,2733,2734],{},"Load",[638,2736,2737],{},"Hook handlers are O(1) per stream event; cost is dominated by your drain",[612,2739,331],{"id":2740},"options",[617,2742,2743,2753],{},[620,2744,2745],{},[623,2746,2747,2750],{},[626,2748,2749],{},"Option",[626,2751,2752],{},"Description",[633,2754,2755,2768,2790,2804,2827,2838],{},[623,2756,2757,2761],{},[638,2758,2759],{},[545,2760,89],{},[638,2762,2763,2764,2767],{},"Passed to ",[545,2765,2766],{},"initLogger()"," on first hook invocation",[623,2769,2770,2785],{},[638,2771,2772,2775,2776,2775,2779,2775,2782],{},[545,2773,2774],{},"drain"," \u002F ",[545,2777,2778],{},"enrich",[545,2780,2781],{},"keep",[545,2783,2784],{},"plugins",[638,2786,2787,2788,919],{},"Same as HTTP integrations (",[529,2789,2784],{"href":465},[623,2791,2792,2797],{},[638,2793,2794],{},[545,2795,2796],{},"redactMessage",[638,2798,2799,2800,2803],{},"Default ",[545,2801,2802],{},"true"," — omits user message text from the wide event",[623,2805,2806,2814],{},[638,2807,2808,2775,2811],{},[545,2809,2810],{},"cost",[545,2812,2813],{},"model",[638,2815,2816,2817,1340,2820,2823,2824],{},"Optional token pricing (",[545,2818,2819],{},"ModelCost",[545,2821,2822],{},"evlog\u002Fai",") → ",[545,2825,2826],{},"ai.estimatedCost",[623,2828,2829,2833],{},[638,2830,2831],{},[545,2832,2724],{},[638,2834,2835,2836,919],{},"In-memory session cap for context carry-over (default ",[545,2837,2728],{},[623,2839,2840,2848],{},[638,2841,2842,2775,2845],{},[545,2843,2844],{},"include",[545,2846,2847],{},"exclude",[638,2849,2850,2851,919],{},"Route-style filters on turn paths (",[545,2852,2853],{},"\u002Fsessions\u002F*\u002Fturns\u002F*",[612,2855,472],{"id":2856},"tail-sampling",[526,2858,2859,2860,2862],{},"Use ",[545,2861,2781],{}," to force-keep turns with failed tools or high token usage:",[682,2864,2866],{"className":771,"code":2865,"filename":767,"language":773,"meta":688,"style":688},"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",[545,2867,2868,2880,2892,2909,2935,2946,2955,2979,2990,3033,3063,3109,3113],{"__ignoreMap":688},[692,2869,2870,2872,2874,2876,2878],{"class":694,"line":695},[692,2871,837],{"class":780},[692,2873,840],{"class":780},[692,2875,789],{"class":843},[692,2877,846],{"class":788},[692,2879,849],{"class":784},[692,2881,2882,2884,2886,2888,2890],{"class":694,"line":806},[692,2883,891],{"class":855},[692,2885,768],{"class":784},[692,2887,813],{"class":843},[692,2889,898],{"class":788},[692,2891,901],{"class":784},[692,2893,2894,2897,2899,2901,2903,2905,2907],{"class":694,"line":827},[692,2895,2896],{"class":843},"  keep",[692,2898,768],{"class":784},[692,2900,912],{"class":784},[692,2902,916],{"class":915},[692,2904,919],{"class":784},[692,2906,923],{"class":922},[692,2908,926],{"class":784},[692,2910,2911,2913,2916,2918,2921,2923,2926,2928,2930,2933],{"class":694,"line":834},[692,2912,1184],{"class":922},[692,2914,2915],{"class":788}," ai",[692,2917,946],{"class":784},[692,2919,2920],{"class":788}," ctx",[692,2922,935],{"class":784},[692,2924,2925],{"class":788},"context",[692,2927,935],{"class":784},[692,2929,1759],{"class":788},[692,2931,2932],{"class":780}," as",[692,2934,926],{"class":784},[692,2936,2937,2940,2943],{"class":694,"line":852},[692,2938,2939],{"class":855},"      inputTokens",[692,2941,2942],{"class":784},"?:",[692,2944,2945],{"class":698}," number\n",[692,2947,2948,2951,2953],{"class":694,"line":888},[692,2949,2950],{"class":855},"      outputTokens",[692,2952,2942],{"class":784},[692,2954,2945],{"class":698},[692,2956,2957,2960,2962,2965,2968,2971,2973,2976],{"class":694,"line":904},[692,2958,2959],{"class":855},"      tools",[692,2961,2942],{"class":784},[692,2963,2964],{"class":698}," Array",[692,2966,2967],{"class":784},"\u003C{",[692,2969,2970],{"class":855}," success",[692,2972,768],{"class":784},[692,2974,2975],{"class":698}," boolean",[692,2977,2978],{"class":784}," 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