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The turn logger is bound via AsyncLocalStorage when defineEvlogHook() is registered; pass ctx only if ALS is unavailable in your runtime",[605,618,619],{},"User message content is omitted by default (message: 'omit'); use 'preview' or 'full' only after reviewing PII policy",[605,621,622],{},"Optionally add agent\u002Finstrumentation.ts with defineEvlogInstrumentation from 'evlog\u002Feve' to join OTel spans to the wide events",[605,624,625],{},"Keep eve Agent Runs. evlog\u002Feve is additive",[544,627,628,629,633,634],{},"Docs: ",[547,630,631],{"href":631,"rel":632},"https:\u002F\u002Fwww.evlog.dev\u002Fuse-cases\u002Feve",[551],"\nAdapters: ",[547,635,636],{"href":636,"rel":637},"https:\u002F\u002Fwww.evlog.dev\u002Fintegrate\u002Fadapters\u002Foverview",[551],[639,640,642],"h2",{"id":641},"when-to-use-what","When to use what",[644,645,646,659],"table",{},[647,648,649],"thead",{},[650,651,652,656],"tr",{},[653,654,655],"th",{},"Need",[653,657,658],{},"Use",[660,661,662,674,686,697],"tbody",{},[650,663,664,668],{},[665,666,667],"td",{},"Debug a session in Vercel",[665,669,670,671,673],{},"eve ",[554,672,556],{}," (automatic)",[650,675,676,679],{},[665,677,678],{},"Span-level traces in Datadog \u002F Honeycomb",[665,680,670,681,685],{},[554,682,683],{},[563,684,565],{}," + OTel exporter",[650,687,688,691],{},[665,689,690],{},"Wide events to Axiom \u002F Better Stack \u002F FS, billing, audit, tail sampling",[665,692,693],{},[554,694,695],{},[563,696,569],{},[650,698,699,702],{},[665,700,701],{},"Jumping from a span to its wide event, and back",[665,703,704,709,710],{},[554,705,706],{},[563,707,708],{},"defineEvlogInstrumentation()"," — ",[547,711,713],{"href":712},"#correlate-traces-with-wide-events","below",[639,715,25],{"id":716},"quick-start",[718,719,721],"h3",{"id":720},"_1-install","1. Install",[723,724,725,753,769,785],"code-group",{},[726,727,733],"pre",{"className":728,"code":729,"filename":730,"language":731,"meta":732,"style":732},"language-bash shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","pnpm add evlog eve\n","pnpm","bash","",[563,734,735],{"__ignoreMap":732},[736,737,740,743,747,750],"span",{"class":738,"line":739},"line",1,[736,741,730],{"class":742},"sBMFI",[736,744,746],{"class":745},"sfazB"," add",[736,748,749],{"class":745}," evlog",[736,751,752],{"class":745}," eve\n",[726,754,757],{"className":728,"code":755,"filename":756,"language":731,"meta":732,"style":732},"bun add evlog eve\n","bun",[563,758,759],{"__ignoreMap":732},[736,760,761,763,765,767],{"class":738,"line":739},[736,762,756],{"class":742},[736,764,746],{"class":745},[736,766,749],{"class":745},[736,768,752],{"class":745},[726,770,773],{"className":728,"code":771,"filename":772,"language":731,"meta":732,"style":732},"yarn add evlog eve\n","yarn",[563,774,775],{"__ignoreMap":732},[736,776,777,779,781,783],{"class":738,"line":739},[736,778,772],{"class":742},[736,780,746],{"class":745},[736,782,749],{"class":745},[736,784,752],{"class":745},[726,786,789],{"className":728,"code":787,"filename":788,"language":731,"meta":732,"style":732},"npm install evlog eve\n","npm",[563,790,791],{"__ignoreMap":732},[736,792,793,795,798,800],{"class":738,"line":739},[736,794,788],{"class":742},[736,796,797],{"class":745}," install",[736,799,749],{"class":745},[736,801,752],{"class":745},[718,803,805],{"id":804},"_2-add-the-hook","2. Add the hook",[544,807,808,809,812],{},"Create ",[563,810,811],{},"agent\u002Fhooks\u002Fevlog.ts",":",[726,814,818],{"className":815,"code":816,"filename":811,"language":817,"meta":732,"style":732},"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",[563,819,820,848,869,876,894,930,946,971,1004,1010],{"__ignoreMap":732},[736,821,822,826,830,834,837,840,843,845],{"class":738,"line":739},[736,823,825],{"class":824},"s7zQu","import",[736,827,829],{"class":828},"sMK4o"," {",[736,831,833],{"class":832},"sTEyZ"," defineEvlogHook",[736,835,836],{"class":828}," }",[736,838,839],{"class":824}," from",[736,841,842],{"class":828}," '",[736,844,569],{"class":745},[736,846,847],{"class":828},"'\n",[736,849,851,853,855,858,860,862,864,867],{"class":738,"line":850},2,[736,852,825],{"class":824},[736,854,829],{"class":828},[736,856,857],{"class":832}," createAxiomDrain",[736,859,836],{"class":828},[736,861,839],{"class":824},[736,863,842],{"class":828},[736,865,866],{"class":745},"evlog\u002Faxiom",[736,868,847],{"class":828},[736,870,872],{"class":738,"line":871},3,[736,873,875],{"emptyLinePlaceholder":874},true,"\n",[736,877,879,882,885,888,891],{"class":738,"line":878},4,[736,880,881],{"class":824},"export",[736,883,884],{"class":824}," default",[736,886,833],{"class":887},"s2Zo4",[736,889,890],{"class":832},"(",[736,892,893],{"class":828},"{\n",[736,895,897,901,903,905,908,910,912,915,917,919,922,925,927],{"class":738,"line":896},5,[736,898,900],{"class":899},"swJcz"," init",[736,902,812],{"class":828},[736,904,829],{"class":828},[736,906,907],{"class":899}," env",[736,909,812],{"class":828},[736,911,829],{"class":828},[736,913,914],{"class":899}," service",[736,916,812],{"class":828},[736,918,842],{"class":828},[736,920,921],{"class":745},"my-agent",[736,923,924],{"class":828},"'",[736,926,836],{"class":828},[736,928,929],{"class":828}," },\n",[736,931,933,936,938,940,943],{"class":738,"line":932},6,[736,934,935],{"class":899}," drain",[736,937,812],{"class":828},[736,939,857],{"class":887},[736,941,942],{"class":832},"()",[736,944,945],{"class":828},",\n",[736,947,949,952,954,957,961,964,968],{"class":738,"line":948},7,[736,950,951],{"class":887}," enrich",[736,953,812],{"class":828},[736,955,956],{"class":828}," (",[736,958,960],{"class":959},"sHdIc","ctx",[736,962,963],{"class":828},")",[736,965,967],{"class":966},"spNyl"," =>",[736,969,970],{"class":828}," {\n",[736,972,974,977,980,983,985,988,991,994,996,999,1001],{"class":738,"line":973},8,[736,975,976],{"class":832}," ctx",[736,978,979],{"class":828},".",[736,981,982],{"class":832},"event",[736,984,979],{"class":828},[736,986,987],{"class":832},"region",[736,989,990],{"class":828}," =",[736,992,993],{"class":832}," process",[736,995,979],{"class":828},[736,997,998],{"class":832},"env",[736,1000,979],{"class":828},[736,1002,1003],{"class":832},"VERCEL_REGION\n",[736,1005,1007],{"class":738,"line":1006},9,[736,1008,1009],{"class":828}," },\n",[736,1011,1013,1016],{"class":738,"line":1012},10,[736,1014,1015],{"class":828},"}",[736,1017,1018],{"class":832},")\n",[544,1020,1021,1022,1025,1026,1029],{},"eve auto-discovers hook files under ",[563,1023,1024],{},"agent\u002Fhooks\u002F",". No HTTP middleware, because the unit of work is an agent ",[554,1027,1028],{},"turn",", not a request.",[718,1031,1033],{"id":1032},"_3-log-business-context-from-tools","3. Log business context from tools",[544,1035,1036,1039,1040,1043,1044,1047,1048,1051,1052,1055,1056,1059],{},[563,1037,1038],{},"defineEvlogHook()"," binds the turn logger via ",[554,1041,1042],{},"AsyncLocalStorage"," on ",[563,1045,1046],{},"turn.started",". Inside tool ",[563,1049,1050],{},"execute()"," handlers, call ",[563,1053,1054],{},"useLogger()"," with no arguments, the same ergonomics as ",[563,1057,1058],{},"useLogger(event)"," in Nuxt or Hono.",[544,1061,1062,1063,1068],{},"In the ",[547,1064,1067],{"href":1065,"rel":1066},"https:\u002F\u002Fgithub.com\u002FHugoRCD\u002Fevlog\u002Ftree\u002Fmain\u002Fexamples\u002Feve",[551],"example agent",", support tools attach customer and order context as the agent works a refund:",[726,1070,1073],{"className":815,"code":1071,"filename":1072,"language":817,"meta":732,"style":732},"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",[563,1074,1075,1095,1114,1134,1138,1150,1166,1206,1224,1247,1261,1329,1338,1343],{"__ignoreMap":732},[736,1076,1077,1079,1081,1084,1086,1088,1090,1093],{"class":738,"line":739},[736,1078,825],{"class":824},[736,1080,829],{"class":828},[736,1082,1083],{"class":832}," defineTool",[736,1085,836],{"class":828},[736,1087,839],{"class":824},[736,1089,842],{"class":828},[736,1091,1092],{"class":745},"eve\u002Ftools",[736,1094,847],{"class":828},[736,1096,1097,1099,1101,1104,1106,1108,1110,1112],{"class":738,"line":850},[736,1098,825],{"class":824},[736,1100,829],{"class":828},[736,1102,1103],{"class":832}," useLogger",[736,1105,836],{"class":828},[736,1107,839],{"class":824},[736,1109,842],{"class":828},[736,1111,569],{"class":745},[736,1113,847],{"class":828},[736,1115,1116,1118,1120,1123,1125,1127,1129,1132],{"class":738,"line":871},[736,1117,825],{"class":824},[736,1119,829],{"class":828},[736,1121,1122],{"class":832}," z",[736,1124,836],{"class":828},[736,1126,839],{"class":824},[736,1128,842],{"class":828},[736,1130,1131],{"class":745},"zod",[736,1133,847],{"class":828},[736,1135,1136],{"class":738,"line":878},[736,1137,875],{"emptyLinePlaceholder":874},[736,1139,1140,1142,1144,1146,1148],{"class":738,"line":896},[736,1141,881],{"class":824},[736,1143,884],{"class":824},[736,1145,1083],{"class":887},[736,1147,890],{"class":832},[736,1149,893],{"class":828},[736,1151,1152,1155,1157,1159,1162,1164],{"class":738,"line":932},[736,1153,1154],{"class":899}," description",[736,1156,812],{"class":828},[736,1158,842],{"class":828},[736,1160,1161],{"class":745},"Look up an order by id.",[736,1163,924],{"class":828},[736,1165,945],{"class":828},[736,1167,1168,1171,1173,1175,1177,1180,1182,1185,1188,1190,1192,1194,1197,1200,1202,1204],{"class":738,"line":948},[736,1169,1170],{"class":899}," inputSchema",[736,1172,812],{"class":828},[736,1174,1122],{"class":832},[736,1176,979],{"class":828},[736,1178,1179],{"class":887},"object",[736,1181,890],{"class":832},[736,1183,1184],{"class":828},"{",[736,1186,1187],{"class":899}," orderId",[736,1189,812],{"class":828},[736,1191,1122],{"class":832},[736,1193,979],{"class":828},[736,1195,1196],{"class":887},"string",[736,1198,1199],{"class":832},"() ",[736,1201,1015],{"class":828},[736,1203,963],{"class":832},[736,1205,945],{"class":828},[736,1207,1208,1211,1214,1217,1219,1222],{"class":738,"line":973},[736,1209,1210],{"class":966}," async",[736,1212,1213],{"class":899}," execute",[736,1215,1216],{"class":828},"({",[736,1218,1187],{"class":959},[736,1220,1221],{"class":828}," })",[736,1223,970],{"class":828},[736,1225,1226,1229,1232,1234,1237,1240,1242,1245],{"class":738,"line":1006},[736,1227,1228],{"class":966}," const",[736,1230,1231],{"class":832}," order",[736,1233,990],{"class":828},[736,1235,1236],{"class":824}," await",[736,1238,1239],{"class":887}," fetchOrder",[736,1241,890],{"class":899},[736,1243,1244],{"class":832},"orderId",[736,1246,1018],{"class":899},[736,1248,1249,1251,1254,1256,1258],{"class":738,"line":1012},[736,1250,1228],{"class":966},[736,1252,1253],{"class":832}," log",[736,1255,990],{"class":828},[736,1257,1103],{"class":887},[736,1259,1260],{"class":899},"()\n",[736,1262,1264,1267,1269,1272,1274,1276,1278,1280,1282,1285,1287,1289,1291,1294,1297,1300,1302,1304,1306,1309,1311,1314,1316,1318,1320,1323,1325,1327],{"class":738,"line":1263},11,[736,1265,1266],{"class":832}," log",[736,1268,979],{"class":828},[736,1270,1271],{"class":887},"set",[736,1273,890],{"class":899},[736,1275,1184],{"class":828},[736,1277,1231],{"class":899},[736,1279,812],{"class":828},[736,1281,829],{"class":828},[736,1283,1284],{"class":899}," id",[736,1286,812],{"class":828},[736,1288,1231],{"class":832},[736,1290,979],{"class":828},[736,1292,1293],{"class":832},"id",[736,1295,1296],{"class":828},",",[736,1298,1299],{"class":899}," amount",[736,1301,812],{"class":828},[736,1303,1231],{"class":832},[736,1305,979],{"class":828},[736,1307,1308],{"class":832},"amount",[736,1310,1296],{"class":828},[736,1312,1313],{"class":899}," status",[736,1315,812],{"class":828},[736,1317,1231],{"class":832},[736,1319,979],{"class":828},[736,1321,1322],{"class":832},"status",[736,1324,836],{"class":828},[736,1326,836],{"class":828},[736,1328,1018],{"class":899},[736,1330,1332,1335],{"class":738,"line":1331},12,[736,1333,1334],{"class":824}," return",[736,1336,1337],{"class":832}," order\n",[736,1339,1341],{"class":738,"line":1340},13,[736,1342,1009],{"class":828},[736,1344,1346,1348],{"class":738,"line":1345},14,[736,1347,1015],{"class":828},[736,1349,1018],{"class":832},[576,1351,1353,1356,1357,1359,1360,1362,1363,1366,1367,1369],{"color":1352,"icon":136},"neutral",[554,1354,1355],{},"Fallback:"," if ",[563,1358,1054],{}," throws outside a turn, pass eve tool ",[563,1361,960],{},": ",[563,1364,1365],{},"useLogger(ctx)",". This covers separate hook\u002Ftool bundles or runtimes where AsyncLocalStorage does not propagate. With a standard eve agent layout and ",[563,1368,811],{}," registered, you should not need it.",[718,1371,1373],{"id":1372},"_4-nextjs-web-chat-optional","4. Next.js web chat (optional)",[544,1375,1376,1377,1380,1381,1384,1385,1388,1389,1384,1392,1395,1396,1399,1400,1403,1404,1407,1408,979],{},"Wrap ",[563,1378,1379],{},"next.config.ts"," with ",[563,1382,1383],{},"withEve()"," from ",[563,1386,1387],{},"eve\u002Fnext"," and use ",[563,1390,1391],{},"useEveAgent()",[563,1393,1394],{},"eve\u002Freact"," in your app. eve starts alongside ",[563,1397,1398],{},"next dev"," and proxies ",[563,1401,1402],{},"\u002Feve\u002Fv1\u002F*"," on the same origin, so tool calls, approvals, and ",[563,1405,1406],{},"ask_question"," work out of the box. See the ",[547,1409,1067],{"href":1065,"rel":1410},[551],[639,1412,1414],{"id":1413},"wide-event-shape","Wide event shape",[544,1416,1417],{},"Each completed turn emits one event:",[726,1419,1424],{"className":1420,"code":1421,"filename":1422,"language":1423,"meta":732,"style":732},"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 \"durationMs\": 7903,\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 \"model\": 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2\n",[736,2211,2212],{"class":738,"line":973},[736,2213,1009],{"class":828},[736,2215,2216,2218,2221,2223,2225,2227,2229,2231,2233,2235,2237,2239,2241,2243,2245,2247,2249,2251,2253,2255,2257,2259,2261,2263,2265,2268,2270],{"class":738,"line":1006},[736,2217,1434],{"class":828},[736,2219,2220],{"class":966},"refund",[736,2222,1440],{"class":828},[736,2224,812],{"class":828},[736,2226,829],{"class":828},[736,2228,1445],{"class":828},[736,2230,1244],{"class":742},[736,2232,1440],{"class":828},[736,2234,812],{"class":828},[736,2236,1445],{"class":828},[736,2238,1728],{"class":745},[736,2240,1440],{"class":828},[736,2242,1296],{"class":828},[736,2244,1445],{"class":828},[736,2246,1308],{"class":742},[736,2248,1440],{"class":828},[736,2250,812],{"class":828},[736,2252,1743],{"class":1485},[736,2254,1296],{"class":828},[736,2256,1445],{"class":828},[736,2258,1322],{"class":742},[736,2260,1440],{"class":828},[736,2262,812],{"class":828},[736,2264,1445],{"class":828},[736,2266,2267],{"class":745},"refunded",[736,2269,1440],{"class":828},[736,2271,929],{"class":828},[736,2273,2274,2276,2279,2281,2283,2285,2287,2290,2292,2294,2296,2299,2301,2303,2305,2308,2310,2312,2314,2316,2319,2321,2323,2325,2327,2329,2331,2333,2335,2337,2339,2341,2343,2345,2347],{"class":738,"line":1012},[736,2275,1434],{"class":828},[736,2277,2278],{"class":966},"audit",[736,2280,1440],{"class":828},[736,2282,812],{"class":828},[736,2284,829],{"class":828},[736,2286,1445],{"class":828},[736,2288,2289],{"class":742},"action",[736,2291,1440],{"class":828},[736,2293,812],{"class":828},[736,2295,1445],{"class":828},[736,2297,2298],{"class":745},"refund.issued",[736,2300,1440],{"class":828},[736,2302,1296],{"class":828},[736,2304,1445],{"class":828},[736,2306,2307],{"class":742},"target",[736,2309,1440],{"class":828},[736,2311,812],{"class":828},[736,2313,829],{"class":828},[736,2315,1445],{"class":828},[736,2317,2318],{"class":1485},"type",[736,2320,1440],{"class":828},[736,2322,812],{"class":828},[736,2324,1445],{"class":828},[736,2326,1709],{"class":745},[736,2328,1440],{"class":828},[736,2330,1296],{"class":828},[736,2332,1445],{"class":828},[736,2334,1293],{"class":1485},[736,2336,1440],{"class":828},[736,2338,812],{"class":828},[736,2340,1445],{"class":828},[736,2342,1728],{"class":745},[736,2344,1440],{"class":828},[736,2346,836],{"class":828},[736,2348,929],{"class":828},[736,2350,2351,2353,2355,2357,2359,2361,2363,2365,2367,2369,2371,2374,2376,2378,2380,2382,2384,2386,2388,2390,2392],{"class":738,"line":1263},[736,2352,1434],{"class":828},[736,2354,1771],{"class":966},[736,2356,1440],{"class":828},[736,2358,812],{"class":828},[736,2360,829],{"class":828},[736,2362,1445],{"class":828},[736,2364,1322],{"class":742},[736,2366,1440],{"class":828},[736,2368,812],{"class":828},[736,2370,1445],{"class":828},[736,2372,2373],{"class":745},"approved",[736,2375,1440],{"class":828},[736,2377,1296],{"class":828},[736,2379,1445],{"class":828},[736,2381,1799],{"class":742},[736,2383,1440],{"class":828},[736,2385,812],{"class":828},[736,2387,1445],{"class":828},[736,2389,1808],{"class":745},[736,2391,1440],{"class":828},[736,2393,929],{"class":828},[736,2395,2396,2398,2400,2402,2404],{"class":738,"line":1331},[736,2397,1434],{"class":828},[736,2399,1820],{"class":966},[736,2401,1440],{"class":828},[736,2403,812],{"class":828},[736,2405,970],{"class":828},[736,2407,2408,2410,2412,2414,2416,2419,2421,2423,2425,2427,2429,2431,2433,2435,2437,2439,2441,2443,2446,2448,2450,2452,2454,2456,2458],{"class":738,"line":1340},[736,2409,1561],{"class":828},[736,2411,1964],{"class":742},[736,2413,1440],{"class":828},[736,2415,812],{"class":828},[736,2417,2418],{"class":828}," [{",[736,2420,1445],{"class":828},[736,2422,1982],{"class":1485},[736,2424,1440],{"class":828},[736,2426,812],{"class":828},[736,2428,1445],{"class":828},[736,2430,1808],{"class":745},[736,2432,1440],{"class":828},[736,2434,1296],{"class":828},[736,2436,1445],{"class":828},[736,2438,1515],{"class":1485},[736,2440,1440],{"class":828},[736,2442,812],{"class":828},[736,2444,2445],{"class":1485}," 993",[736,2447,1296],{"class":828},[736,2449,1445],{"class":828},[736,2451,2013],{"class":1485},[736,2453,1440],{"class":828},[736,2455,812],{"class":828},[736,2457,2079],{"class":828},[736,2459,2460],{"class":828}," }],\n",[736,2462,2463,2465,2467,2469,2471,2473,2476],{"class":738,"line":1345},[736,2464,1561],{"class":828},[736,2466,1943],{"class":742},[736,2468,1440],{"class":828},[736,2470,812],{"class":828},[736,2472,1445],{"class":828},[736,2474,2475],{"class":745},"stop",[736,2477,2478],{"class":828},"\"\n",[736,2480,2481],{"class":738,"line":1654},[736,2482,2094],{"class":828},[736,2484,2485],{"class":738,"line":1704},[736,2486,2100],{"class":828},[544,2488,2489,2490,2493,2494,2493,2497,2500,2501,2503,2504,2507,2508,2511,2512,2515,2516,2493,2518,2493,2521,2493,2524,2493,2527,979],{},"Token usage and tool executions are accumulated from eve stream events (",[563,2491,2492],{},"step.completed",", ",[563,2495,2496],{},"actions.requested",[563,2498,2499],{},"action.result","). Business fields set via ",[563,2502,1054],{}," carry across turns in the same session. Link turns in analytics with ",[563,2505,2506],{},"eve.sessionId"," + ",[563,2509,2510],{},"eve.turnSequence",", and each event stays self-contained. ",[563,2513,2514],{},"eve.phase"," is only set for non-routine endings: ",[563,2517,1629],{},[563,2519,2520],{},"awaiting-authorization",[563,2522,2523],{},"rejected",[563,2525,2526],{},"cancelled",[563,2528,2529],{},"failed",[718,2531,2533],{"id":2532},"everything-the-turn-can-report","Everything the turn can report",[544,2535,2536],{},"Beyond the identifiers above, a turn records what eve reports about it. Every field is optional and appears only when the turn produced it.",[644,2538,2539,2549],{},[647,2540,2541],{},[650,2542,2543,2546],{},[653,2544,2545],{},"Field",[653,2547,2548],{},"What it tells you",[660,2550,2551,2571,2598,2611,2628,2642,2655,2665,2681,2691,2701,2715,2732,2757],{},[650,2552,2553,2558],{},[665,2554,2555],{},[563,2556,2557],{},"eve.runtime",[665,2559,2560,2561,2564,2565,2564,2568],{},"eve version, agent id, model, and the deployed ",[563,2562,2563],{},"gitSha"," \u002F ",[563,2566,2567],{},"gitBranch",[563,2569,2570],{},"deployedAt",[650,2572,2573,2578],{},[665,2574,2575],{},[563,2576,2577],{},"eve.caller",[665,2579,2580,2581,2493,2584,588,2587,2590,2591,588,2594,2597],{},"Who triggered the turn: ",[563,2582,2583],{},"principalId",[563,2585,2586],{},"principalType",[563,2588,2589],{},"authenticator",". On a multi-user channel this is what you group cost and volume by. ",[563,2592,2593],{},"subject",[563,2595,2596],{},"attributes"," are never recorded — a channel may put a name or an email in them",[650,2599,2600,2605],{},[665,2601,2602],{},[563,2603,2604],{},"eve.parent",[665,2606,2607,2608],{},"Parent and root session ids for a subagent run — rebuild the delegation tree with ",[563,2609,2610],{},"rootSessionId",[650,2612,2613,2618],{},[665,2614,2615],{},[563,2616,2617],{},"eve.authorizations",[665,2619,2620,2621,2493,2624,2627],{},"Connection sign-ins with their ",[563,2622,2623],{},"outcome",[563,2625,2626],{},"reason"," and duration",[650,2629,2630,2635],{},[665,2631,2632],{},[563,2633,2634],{},"eve.compaction",[665,2636,2637,2638,2641],{},"How many compactions ran, on which model, and ",[563,2639,2640],{},"inputTokensAtTrigger"," — how full the context was when the first one fired",[650,2643,2644,2652],{},[665,2645,2646,2564,2649],{},[563,2647,2648],{},"eve.stepFailures",[563,2650,2651],{},"eve.failedSteps",[665,2653,2654],{},"Model calls that failed, including on a turn that then succeeded on retry",[650,2656,2657,2662],{},[665,2658,2659],{},[563,2660,2661],{},"eve.subagents",[665,2663,2664],{},"Delegations with their status and duration",[650,2666,2667,2672],{},[665,2668,2669],{},[563,2670,2671],{},"eve.reasoning",[665,2673,2674,588,2677,2680],{},[563,2675,2676],{},"blocks",[563,2678,2679],{},"chars"," — the size of the model's thinking, never its content",[650,2682,2683,2688],{},[665,2684,2685],{},[563,2686,2687],{},"eve.result",[665,2689,2690],{},"The structured result, for an agent with an output schema",[650,2692,2693,2698],{},[665,2694,2695],{},[563,2696,2697],{},"eve.contextCleared",[665,2699,2700],{},"The durable history was wiped during this turn",[650,2702,2703,2708],{},[665,2704,2705],{},[563,2706,2707],{},"message.responseChars",[665,2709,2710,2711,2714],{},"Length of the agent's response, recorded whatever the ",[563,2712,2713],{},"message"," mode",[650,2716,2717,2722],{},[665,2718,2719],{},[563,2720,2721],{},"ai.costUsd",[665,2723,2724,2725,2728,2729],{},"Cost as reported by eve. ",[563,2726,2727],{},"ai.estimatedCost"," is the fallback computed from ",[563,2730,2731],{},"cost",[650,2733,2734,2742],{},[665,2735,2736,2564,2739],{},[563,2737,2738],{},"ai.model",[563,2740,2741],{},"ai.provider",[665,2743,2744,2745,2747,2748,2750,2751,2753,2754],{},"The gateway slug (",[563,2746,1843],{},") and the resolved provider (",[563,2749,1864],{},") that served the turn. ",[563,2752,2741],{}," is split from the model id eve reports on ",[563,2755,2756],{},"session.started",[650,2758,2759,2764],{},[665,2760,2761],{},[563,2762,2763],{},"ai.tools[].inputTokens",[665,2765,2766],{},"The input tokens a tool result added to the next model call: the delta between the step that called the tool and the step that consumed its result. Parallel results in one step share the delta evenly; left unset when the turn ended before the result was consumed, or when a compaction reset the context",[639,2768,2770],{"id":2769},"correlate-traces-with-wide-events","Correlate traces with wide events",[544,2772,2773,2774,2776],{},"A wide event and an Agent Runs span describe the same turn, but nothing joins them on its own. ",[563,2775,708],{}," stamps evlog's turn identity onto eve's AI SDK spans:",[726,2778,2780],{"className":815,"code":2779,"filename":565,"language":817,"meta":732,"style":732},"import { defineEvlogInstrumentation } from 'evlog\u002Feve'\n\nexport default defineEvlogInstrumentation()\n",[563,2781,2782,2801,2805],{"__ignoreMap":732},[736,2783,2784,2786,2788,2791,2793,2795,2797,2799],{"class":738,"line":739},[736,2785,825],{"class":824},[736,2787,829],{"class":828},[736,2789,2790],{"class":832}," defineEvlogInstrumentation",[736,2792,836],{"class":828},[736,2794,839],{"class":824},[736,2796,842],{"class":828},[736,2798,569],{"class":745},[736,2800,847],{"class":828},[736,2802,2803],{"class":738,"line":850},[736,2804,875],{"emptyLinePlaceholder":874},[736,2806,2807,2809,2811,2813],{"class":738,"line":871},[736,2808,881],{"class":824},[736,2810,884],{"class":824},[736,2812,2790],{"class":887},[736,2814,1260],{"class":832},[544,2816,2817,2818,588,2821,2824,2825,588,2828,2830],{},"Every model-call span, and its children, then carries ",[563,2819,2820],{},"evlog.request_id",[563,2822,2823],{},"evlog.session_id",", the same values the wide event reports as ",[563,2826,2827],{},"requestId",[563,2829,2506],{},". Jump from a trace in Braintrust, Datadog or Agent Runs straight to the event in your drain, and back.",[544,2832,2833,2834,2837,2838,2841],{},"Without ",[563,2835,2836],{},"setup",", OpenTelemetry export is untouched: eve keeps writing its local traces, readable with ",[563,2839,2840],{},"eve traces",". Pass one to export elsewhere:",[726,2843,2845],{"className":815,"code":2844,"filename":565,"language":817,"meta":732,"style":732},"import { defineEvlogInstrumentation } from 'evlog\u002Feve'\nimport { registerOTel } from '@vercel\u002Fotel'\n\nexport default defineEvlogInstrumentation({\n setup: ({ agentName }) => registerOTel({ serviceName: agentName }),\n})\n",[563,2846,2847,2865,2885,2889,2901,2938],{"__ignoreMap":732},[736,2848,2849,2851,2853,2855,2857,2859,2861,2863],{"class":738,"line":739},[736,2850,825],{"class":824},[736,2852,829],{"class":828},[736,2854,2790],{"class":832},[736,2856,836],{"class":828},[736,2858,839],{"class":824},[736,2860,842],{"class":828},[736,2862,569],{"class":745},[736,2864,847],{"class":828},[736,2866,2867,2869,2871,2874,2876,2878,2880,2883],{"class":738,"line":850},[736,2868,825],{"class":824},[736,2870,829],{"class":828},[736,2872,2873],{"class":832}," registerOTel",[736,2875,836],{"class":828},[736,2877,839],{"class":824},[736,2879,842],{"class":828},[736,2881,2882],{"class":745},"@vercel\u002Fotel",[736,2884,847],{"class":828},[736,2886,2887],{"class":738,"line":871},[736,2888,875],{"emptyLinePlaceholder":874},[736,2890,2891,2893,2895,2897,2899],{"class":738,"line":878},[736,2892,881],{"class":824},[736,2894,884],{"class":824},[736,2896,2790],{"class":887},[736,2898,890],{"class":832},[736,2900,893],{"class":828},[736,2902,2903,2906,2908,2911,2914,2916,2918,2920,2922,2924,2927,2929,2932,2934,2936],{"class":738,"line":896},[736,2904,2905],{"class":887}," setup",[736,2907,812],{"class":828},[736,2909,2910],{"class":828}," ({",[736,2912,2913],{"class":959}," agentName",[736,2915,1221],{"class":828},[736,2917,967],{"class":966},[736,2919,2873],{"class":887},[736,2921,890],{"class":832},[736,2923,1184],{"class":828},[736,2925,2926],{"class":899}," serviceName",[736,2928,812],{"class":828},[736,2930,2931],{"class":832}," agentName ",[736,2933,1015],{"class":828},[736,2935,963],{"class":832},[736,2937,945],{"class":828},[736,2939,2940,2942],{"class":738,"line":932},[736,2941,1015],{"class":828},[736,2943,1018],{"class":832},[544,2945,2946,2493,2949,2493,2952,588,2955,2958,2959,979],{},[563,2947,2948],{},"functionId",[563,2950,2951],{},"recordInputs",[563,2953,2954],{},"recordOutputs",[563,2956,2957],{},"traceChannelRequests"," pass straight through to eve's ",[563,2960,2961],{},"defineInstrumentation",[718,2963,2965],{"id":2964},"alongside-another-observability-backend","Alongside another observability backend",[544,2967,2968,2970,2971,2973,2974,2977,2978,2981],{},[563,2969,708],{}," is the shortcut for an agent whose instrumentation is evlog's alone. It owns the file, and an agent has exactly one ",[563,2972,565],{},", so every observability item in eve's registry writes that same path, which is why ",[563,2975,2976],{},"eve add instrumentation\u002Fsentry"," after ",[563,2979,2980],{},"eve add instrumentation\u002Fposthog"," refuses rather than clobbering the first.",[544,2983,2984,2985,2987,2988,2991],{},"Once another backend is in play, write the file yourself with eve's own ",[563,2986,2961],{}," and spread ",[563,2989,2990],{},"evlogRuntimeContext"," into your runtime context. evlog contributes attributes to your instrumentation instead of wrapping it:",[726,2993,2995],{"className":815,"code":2994,"filename":565,"language":817,"meta":732,"style":732},"import { BatchSpanProcessor, SimpleSpanProcessor } from '@opentelemetry\u002Fsdk-trace-base'\nimport { PostHogTraceExporter } from '@posthog\u002Fai\u002Fotel'\nimport { OTLPHttpProtoTraceExporter, registerOTel } from '@vercel\u002Fotel'\nimport { defineInstrumentation } from 'eve\u002Finstrumentation'\nimport { evlogRuntimeContext } from 'evlog\u002Feve'\n\nexport default defineInstrumentation({\n \u002F\u002F One provider, one span processor per backend. Items that generate\n \u002F\u002F `traceExporter` (Sentry, Datadog, Arize, Jaeger, Braintrust, Honeycomb)\n \u002F\u002F become an entry in this array. Call registerOTel once, not once per backend.\n setup: ({ agentName }) => registerOTel({\n serviceName: agentName,\n spanProcessors: [\n new SimpleSpanProcessor(new PostHogTraceExporter({\n projectToken: process.env.POSTHOG_PROJECT_TOKEN!,\n })),\n new BatchSpanProcessor(new OTLPHttpProtoTraceExporter({\n url: process.env.SENTRY_OTLP_TRACES_ENDPOINT!,\n headers: { 'x-sentry-auth': `sentry sentry_key=${process.env.SENTRY_PUBLIC_KEY}` },\n })),\n ],\n }),\n events: {\n 'step.started': (input) => {\n const principalId = input.session.auth.initiator?.principalId\n ?? input.session.auth.current?.principalId\n return {\n runtimeContext: {\n ...evlogRuntimeContext(input),\n \u002F\u002F Omitted rather than blank: an empty attribute reads as an empty id.\n ...(principalId ? { posthog_distinct_id: principalId } : {}),\n },\n }\n },\n },\n})\n",[563,2996,2997,3022,3042,3065,3085,3104,3108,3120,3126,3131,3136,3156,3167,3176,3194,3215,3225,3241,3261,3305,3313,3320,3329,3338,3361,3395,3419,3426,3435,3450,3455,3487,3493,3499,3505,3510],{"__ignoreMap":732},[736,2998,2999,3001,3003,3006,3008,3011,3013,3015,3017,3020],{"class":738,"line":739},[736,3000,825],{"class":824},[736,3002,829],{"class":828},[736,3004,3005],{"class":832}," BatchSpanProcessor",[736,3007,1296],{"class":828},[736,3009,3010],{"class":832}," SimpleSpanProcessor",[736,3012,836],{"class":828},[736,3014,839],{"class":824},[736,3016,842],{"class":828},[736,3018,3019],{"class":745},"@opentelemetry\u002Fsdk-trace-base",[736,3021,847],{"class":828},[736,3023,3024,3026,3028,3031,3033,3035,3037,3040],{"class":738,"line":850},[736,3025,825],{"class":824},[736,3027,829],{"class":828},[736,3029,3030],{"class":832}," PostHogTraceExporter",[736,3032,836],{"class":828},[736,3034,839],{"class":824},[736,3036,842],{"class":828},[736,3038,3039],{"class":745},"@posthog\u002Fai\u002Fotel",[736,3041,847],{"class":828},[736,3043,3044,3046,3048,3051,3053,3055,3057,3059,3061,3063],{"class":738,"line":871},[736,3045,825],{"class":824},[736,3047,829],{"class":828},[736,3049,3050],{"class":832}," OTLPHttpProtoTraceExporter",[736,3052,1296],{"class":828},[736,3054,2873],{"class":832},[736,3056,836],{"class":828},[736,3058,839],{"class":824},[736,3060,842],{"class":828},[736,3062,2882],{"class":745},[736,3064,847],{"class":828},[736,3066,3067,3069,3071,3074,3076,3078,3080,3083],{"class":738,"line":878},[736,3068,825],{"class":824},[736,3070,829],{"class":828},[736,3072,3073],{"class":832}," defineInstrumentation",[736,3075,836],{"class":828},[736,3077,839],{"class":824},[736,3079,842],{"class":828},[736,3081,3082],{"class":745},"eve\u002Finstrumentation",[736,3084,847],{"class":828},[736,3086,3087,3089,3091,3094,3096,3098,3100,3102],{"class":738,"line":896},[736,3088,825],{"class":824},[736,3090,829],{"class":828},[736,3092,3093],{"class":832}," evlogRuntimeContext",[736,3095,836],{"class":828},[736,3097,839],{"class":824},[736,3099,842],{"class":828},[736,3101,569],{"class":745},[736,3103,847],{"class":828},[736,3105,3106],{"class":738,"line":932},[736,3107,875],{"emptyLinePlaceholder":874},[736,3109,3110,3112,3114,3116,3118],{"class":738,"line":948},[736,3111,881],{"class":824},[736,3113,884],{"class":824},[736,3115,3073],{"class":887},[736,3117,890],{"class":832},[736,3119,893],{"class":828},[736,3121,3122],{"class":738,"line":973},[736,3123,3125],{"class":3124},"sHwdD"," \u002F\u002F One provider, one span processor per backend. Items that generate\n",[736,3127,3128],{"class":738,"line":1006},[736,3129,3130],{"class":3124}," \u002F\u002F `traceExporter` (Sentry, Datadog, Arize, Jaeger, Braintrust, Honeycomb)\n",[736,3132,3133],{"class":738,"line":1012},[736,3134,3135],{"class":3124}," \u002F\u002F become an entry in this array. Call registerOTel once, not once per backend.\n",[736,3137,3138,3140,3142,3144,3146,3148,3150,3152,3154],{"class":738,"line":1263},[736,3139,2905],{"class":887},[736,3141,812],{"class":828},[736,3143,2910],{"class":828},[736,3145,2913],{"class":959},[736,3147,1221],{"class":828},[736,3149,967],{"class":966},[736,3151,2873],{"class":887},[736,3153,890],{"class":832},[736,3155,893],{"class":828},[736,3157,3158,3161,3163,3165],{"class":738,"line":1331},[736,3159,3160],{"class":899}," serviceName",[736,3162,812],{"class":828},[736,3164,2913],{"class":832},[736,3166,945],{"class":828},[736,3168,3169,3172,3174],{"class":738,"line":1340},[736,3170,3171],{"class":899}," spanProcessors",[736,3173,812],{"class":828},[736,3175,1971],{"class":832},[736,3177,3178,3181,3183,3185,3188,3190,3192],{"class":738,"line":1345},[736,3179,3180],{"class":828}," new",[736,3182,3010],{"class":887},[736,3184,890],{"class":832},[736,3186,3187],{"class":828},"new",[736,3189,3030],{"class":887},[736,3191,890],{"class":832},[736,3193,893],{"class":828},[736,3195,3196,3199,3201,3203,3205,3207,3209,3212],{"class":738,"line":1654},[736,3197,3198],{"class":899}," projectToken",[736,3200,812],{"class":828},[736,3202,993],{"class":832},[736,3204,979],{"class":828},[736,3206,998],{"class":832},[736,3208,979],{"class":828},[736,3210,3211],{"class":832},"POSTHOG_PROJECT_TOKEN",[736,3213,3214],{"class":828},"!,\n",[736,3216,3217,3220,3223],{"class":738,"line":1704},[736,3218,3219],{"class":828}," }",[736,3221,3222],{"class":832},"))",[736,3224,945],{"class":828},[736,3226,3227,3229,3231,3233,3235,3237,3239],{"class":738,"line":1766},[736,3228,3180],{"class":828},[736,3230,3005],{"class":887},[736,3232,890],{"class":832},[736,3234,3187],{"class":828},[736,3236,3050],{"class":887},[736,3238,890],{"class":832},[736,3240,893],{"class":828},[736,3242,3243,3246,3248,3250,3252,3254,3256,3259],{"class":738,"line":1815},[736,3244,3245],{"class":899}," url",[736,3247,812],{"class":828},[736,3249,993],{"class":832},[736,3251,979],{"class":828},[736,3253,998],{"class":832},[736,3255,979],{"class":828},[736,3257,3258],{"class":832},"SENTRY_OTLP_TRACES_ENDPOINT",[736,3260,3214],{"class":828},[736,3262,3263,3266,3268,3270,3272,3275,3277,3279,3282,3285,3288,3291,3293,3295,3297,3300,3303],{"class":738,"line":1829},[736,3264,3265],{"class":899}," headers",[736,3267,812],{"class":828},[736,3269,829],{"class":828},[736,3271,842],{"class":828},[736,3273,3274],{"class":899},"x-sentry-auth",[736,3276,924],{"class":828},[736,3278,812],{"class":828},[736,3280,3281],{"class":828}," `",[736,3283,3284],{"class":745},"sentry sentry_key=",[736,3286,3287],{"class":828},"${",[736,3289,3290],{"class":832},"process",[736,3292,979],{"class":828},[736,3294,998],{"class":832},[736,3296,979],{"class":828},[736,3298,3299],{"class":832},"SENTRY_PUBLIC_KEY",[736,3301,3302],{"class":828},"}`",[736,3304,929],{"class":828},[736,3306,3307,3309,3311],{"class":738,"line":1850},[736,3308,3219],{"class":828},[736,3310,3222],{"class":832},[736,3312,945],{"class":828},[736,3314,3315,3318],{"class":738,"line":1871},[736,3316,3317],{"class":832}," ]",[736,3319,945],{"class":828},[736,3321,3322,3325,3327],{"class":738,"line":1888},[736,3323,3324],{"class":828}," }",[736,3326,963],{"class":832},[736,3328,945],{"class":828},[736,3330,3331,3334,3336],{"class":738,"line":1904},[736,3332,3333],{"class":899}," events",[736,3335,812],{"class":828},[736,3337,970],{"class":828},[736,3339,3340,3343,3346,3348,3350,3352,3355,3357,3359],{"class":738,"line":1921},[736,3341,3342],{"class":828}," '",[736,3344,3345],{"class":899},"step.started",[736,3347,924],{"class":828},[736,3349,812],{"class":828},[736,3351,956],{"class":828},[736,3353,3354],{"class":959},"input",[736,3356,963],{"class":828},[736,3358,967],{"class":966},[736,3360,970],{"class":828},[736,3362,3363,3366,3369,3371,3374,3376,3379,3381,3384,3386,3389,3392],{"class":738,"line":1938},[736,3364,3365],{"class":966}," const",[736,3367,3368],{"class":832}," principalId",[736,3370,990],{"class":828},[736,3372,3373],{"class":832}," input",[736,3375,979],{"class":828},[736,3377,3378],{"class":832},"session",[736,3380,979],{"class":828},[736,3382,3383],{"class":832},"auth",[736,3385,979],{"class":828},[736,3387,3388],{"class":832},"initiator",[736,3390,3391],{"class":828},"?.",[736,3393,3394],{"class":832},"principalId\n",[736,3396,3397,3400,3402,3404,3406,3408,3410,3412,3415,3417],{"class":738,"line":1959},[736,3398,3399],{"class":828}," ??",[736,3401,3373],{"class":832},[736,3403,979],{"class":828},[736,3405,3378],{"class":832},[736,3407,979],{"class":828},[736,3409,3383],{"class":832},[736,3411,979],{"class":828},[736,3413,3414],{"class":832},"current",[736,3416,3391],{"class":828},[736,3418,3394],{"class":832},[736,3420,3421,3424],{"class":738,"line":1974},[736,3422,3423],{"class":824}," return",[736,3425,970],{"class":828},[736,3427,3428,3431,3433],{"class":738,"line":2036},[736,3429,3430],{"class":899}," runtimeContext",[736,3432,812],{"class":828},[736,3434,970],{"class":828},[736,3436,3437,3440,3442,3444,3446,3448],{"class":738,"line":2085},[736,3438,3439],{"class":828}," ...",[736,3441,2990],{"class":887},[736,3443,890],{"class":899},[736,3445,3354],{"class":832},[736,3447,963],{"class":899},[736,3449,945],{"class":828},[736,3451,3452],{"class":738,"line":2091},[736,3453,3454],{"class":3124}," \u002F\u002F Omitted rather than blank: an empty attribute reads as an empty id.\n",[736,3456,3457,3459,3461,3463,3466,3468,3471,3473,3475,3477,3480,3483,3485],{"class":738,"line":2097},[736,3458,3439],{"class":828},[736,3460,890],{"class":899},[736,3462,2583],{"class":832},[736,3464,3465],{"class":828}," ?",[736,3467,829],{"class":828},[736,3469,3470],{"class":899}," posthog_distinct_id",[736,3472,812],{"class":828},[736,3474,3368],{"class":832},[736,3476,836],{"class":828},[736,3478,3479],{"class":828}," :",[736,3481,3482],{"class":828}," {}",[736,3484,963],{"class":899},[736,3486,945],{"class":828},[736,3488,3490],{"class":738,"line":3489},32,[736,3491,3492],{"class":828}," },\n",[736,3494,3496],{"class":738,"line":3495},33,[736,3497,3498],{"class":828}," }\n",[736,3500,3502],{"class":738,"line":3501},34,[736,3503,3504],{"class":828}," },\n",[736,3506,3508],{"class":738,"line":3507},35,[736,3509,1009],{"class":828},[736,3511,3513,3515],{"class":738,"line":3512},36,[736,3514,1015],{"class":828},[736,3516,1018],{"class":832},[544,3518,3519,3521,3522,3525,3526,3529],{},[563,3520,2990],{}," returns ",[563,3523,3524],{},"undefined"," outside a tracked turn, and spreading that adds nothing. PostHog is the only registry item that also uses ",[563,3527,3528],{},"events","; the rest only need their span processor. Keep each generated file open while you merge: the env vars and exporter options are the parts worth copying exactly.",[544,3531,3532,3533,3536,3537,3539],{},"Spans and wide events stay joined by attribute, not by trace id: an agent turn has no inbound ",[563,3534,3535],{},"traceparent"," to inherit, so ",[563,3538,2820],{}," is what carries across.",[576,3541,3544,3550,3551,2564,3554,3557,3558,3561,3562,3565,3566,3569,3570,3572],{"color":3542,"icon":3543},"warning","i-lucide-triangle-alert",[554,3545,3546,3547,979],{},"PostHog drops ",[563,3548,3549],{},"evlog.*"," Its exporter forwards the whole span, but the server-side conversion into ",[563,3552,3553],{},"$ai_generation",[563,3555,3556],{},"$ai_span"," events keeps only attributes prefixed ",[563,3559,3560],{},"posthog_",", and strips that prefix. To join on PostHog, repeat the ids under names that survive, since ",[563,3563,3564],{},"posthog_evlog_request_id"," arrives as ",[563,3567,3568],{},"evlog_request_id",". Other OTLP backends receive ",[563,3571,3549],{}," unchanged.",[544,3574,3575,3576,3579],{},"eve applies the runtime context to the step span only, so the generation spans beneath it inherit nothing. On PostHog that means cost lands on events with no identity and no environment. A span processor that copies the turn's ",[563,3577,3578],{},"posthog_*"," attributes onto every child span is what closes the gap.",[544,3581,3582],{},"To close the loop the other way, send the agent's own wide events to PostHog Logs and point the drain at the same principal:",[726,3584,3586],{"className":815,"code":3585,"filename":811,"language":817,"meta":732,"style":732},"import { createPostHogDrain } from 'evlog\u002Fposthog'\nimport { defineEvlogHook } from 'evlog\u002Feve'\n\nexport default defineEvlogHook({\n drain: createPostHogDrain({ distinctIdField: 'eve.caller.principalId' }),\n})\n",[563,3587,3588,3608,3626,3630,3642,3672],{"__ignoreMap":732},[736,3589,3590,3592,3594,3597,3599,3601,3603,3606],{"class":738,"line":739},[736,3591,825],{"class":824},[736,3593,829],{"class":828},[736,3595,3596],{"class":832}," createPostHogDrain",[736,3598,836],{"class":828},[736,3600,839],{"class":824},[736,3602,842],{"class":828},[736,3604,3605],{"class":745},"evlog\u002Fposthog",[736,3607,847],{"class":828},[736,3609,3610,3612,3614,3616,3618,3620,3622,3624],{"class":738,"line":850},[736,3611,825],{"class":824},[736,3613,829],{"class":828},[736,3615,833],{"class":832},[736,3617,836],{"class":828},[736,3619,839],{"class":824},[736,3621,842],{"class":828},[736,3623,569],{"class":745},[736,3625,847],{"class":828},[736,3627,3628],{"class":738,"line":871},[736,3629,875],{"emptyLinePlaceholder":874},[736,3631,3632,3634,3636,3638,3640],{"class":738,"line":878},[736,3633,881],{"class":824},[736,3635,884],{"class":824},[736,3637,833],{"class":887},[736,3639,890],{"class":832},[736,3641,893],{"class":828},[736,3643,3644,3646,3648,3650,3652,3654,3657,3659,3661,3664,3666,3668,3670],{"class":738,"line":896},[736,3645,935],{"class":899},[736,3647,812],{"class":828},[736,3649,3596],{"class":887},[736,3651,890],{"class":832},[736,3653,1184],{"class":828},[736,3655,3656],{"class":899}," distinctIdField",[736,3658,812],{"class":828},[736,3660,842],{"class":828},[736,3662,3663],{"class":745},"eve.caller.principalId",[736,3665,924],{"class":828},[736,3667,836],{"class":828},[736,3669,963],{"class":832},[736,3671,945],{"class":828},[736,3673,3674,3676],{"class":738,"line":932},[736,3675,1015],{"class":828},[736,3677,1018],{"class":832},[544,3679,3680,3681,979],{},"Turns then land on the same PostHog person as the LLM traces they produced. See the ",[547,3682,3684],{"href":3683},"\u002Fintegrate\u002Fadapters\u002Fcloud\u002Fposthog#link-a-log-to-a-person-and-a-session-replay","PostHog adapter",[639,3686,3688],{"id":3687},"production","Production",[544,3690,3691],{},"Long-running eve agents should disable terminal pretty-printing and use a non-blocking drain:",[726,3693,3695],{"className":815,"code":3694,"filename":811,"language":817,"meta":732,"style":732},"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",[563,3696,3697,3715,3733,3753,3757,3806,3815,3819,3823,3835,3843,3877,3890,3918,3922,3928,3940],{"__ignoreMap":732},[736,3698,3699,3701,3703,3705,3707,3709,3711,3713],{"class":738,"line":739},[736,3700,825],{"class":824},[736,3702,829],{"class":828},[736,3704,833],{"class":832},[736,3706,836],{"class":828},[736,3708,839],{"class":824},[736,3710,842],{"class":828},[736,3712,569],{"class":745},[736,3714,847],{"class":828},[736,3716,3717,3719,3721,3723,3725,3727,3729,3731],{"class":738,"line":850},[736,3718,825],{"class":824},[736,3720,829],{"class":828},[736,3722,857],{"class":832},[736,3724,836],{"class":828},[736,3726,839],{"class":824},[736,3728,842],{"class":828},[736,3730,866],{"class":745},[736,3732,847],{"class":828},[736,3734,3735,3737,3739,3742,3744,3746,3748,3751],{"class":738,"line":871},[736,3736,825],{"class":824},[736,3738,829],{"class":828},[736,3740,3741],{"class":832}," createDrainPipeline",[736,3743,836],{"class":828},[736,3745,839],{"class":824},[736,3747,842],{"class":828},[736,3749,3750],{"class":745},"evlog\u002Fpipeline",[736,3752,847],{"class":828},[736,3754,3755],{"class":738,"line":878},[736,3756,875],{"emptyLinePlaceholder":874},[736,3758,3759,3762,3765,3768,3770,3772,3774,3777,3779,3781,3784,3786,3789,3791,3794,3796,3799,3801,3803],{"class":738,"line":896},[736,3760,3761],{"class":966},"const",[736,3763,3764],{"class":832}," drain ",[736,3766,3767],{"class":828},"=",[736,3769,3741],{"class":887},[736,3771,890],{"class":832},[736,3773,1184],{"class":828},[736,3775,3776],{"class":899}," batch",[736,3778,812],{"class":828},[736,3780,829],{"class":828},[736,3782,3783],{"class":899}," size",[736,3785,812],{"class":828},[736,3787,3788],{"class":1485}," 50",[736,3790,1296],{"class":828},[736,3792,3793],{"class":899}," intervalMs",[736,3795,812],{"class":828},[736,3797,3798],{"class":1485}," 5000",[736,3800,836],{"class":828},[736,3802,836],{"class":828},[736,3804,3805],{"class":832},")(\n",[736,3807,3808,3811,3813],{"class":738,"line":932},[736,3809,3810],{"class":887}," createAxiomDrain",[736,3812,942],{"class":832},[736,3814,945],{"class":828},[736,3816,3817],{"class":738,"line":948},[736,3818,1018],{"class":832},[736,3820,3821],{"class":738,"line":973},[736,3822,875],{"emptyLinePlaceholder":874},[736,3824,3825,3827,3829,3831,3833],{"class":738,"line":1006},[736,3826,881],{"class":824},[736,3828,884],{"class":824},[736,3830,833],{"class":887},[736,3832,890],{"class":832},[736,3834,893],{"class":828},[736,3836,3837,3839,3841],{"class":738,"line":1012},[736,3838,900],{"class":899},[736,3840,812],{"class":828},[736,3842,970],{"class":828},[736,3844,3845,3848,3850,3852,3854,3856,3858,3860,3862,3864,3867,3869,3871,3873,3875],{"class":738,"line":1263},[736,3846,3847],{"class":899}," env",[736,3849,812],{"class":828},[736,3851,829],{"class":828},[736,3853,914],{"class":899},[736,3855,812],{"class":828},[736,3857,842],{"class":828},[736,3859,921],{"class":745},[736,3861,924],{"class":828},[736,3863,1296],{"class":828},[736,3865,3866],{"class":899}," environment",[736,3868,812],{"class":828},[736,3870,842],{"class":828},[736,3872,3687],{"class":745},[736,3874,924],{"class":828},[736,3876,929],{"class":828},[736,3878,3879,3882,3884,3888],{"class":738,"line":1331},[736,3880,3881],{"class":899}," pretty",[736,3883,812],{"class":828},[736,3885,3887],{"class":3886},"sfNiH"," false",[736,3889,945],{"class":828},[736,3891,3892,3895,3897,3899,3902,3904,3906,3909,3911,3914,3916],{"class":738,"line":1340},[736,3893,3894],{"class":899}," sampling",[736,3896,812],{"class":828},[736,3898,829],{"class":828},[736,3900,3901],{"class":899}," rates",[736,3903,812],{"class":828},[736,3905,829],{"class":828},[736,3907,3908],{"class":899}," info",[736,3910,812],{"class":828},[736,3912,3913],{"class":1485}," 10",[736,3915,836],{"class":828},[736,3917,929],{"class":828},[736,3919,3920],{"class":738,"line":1345},[736,3921,1009],{"class":828},[736,3923,3924,3926],{"class":738,"line":1654},[736,3925,935],{"class":832},[736,3927,945],{"class":828},[736,3929,3930,3933,3935,3938],{"class":738,"line":1704},[736,3931,3932],{"class":899}," maxSessions",[736,3934,812],{"class":828},[736,3936,3937],{"class":1485}," 256",[736,3939,945],{"class":828},[736,3941,3942,3944],{"class":738,"line":1766},[736,3943,1015],{"class":828},[736,3945,1018],{"class":832},[644,3947,3948,3958],{},[647,3949,3950],{},[650,3951,3952,3955],{},[653,3953,3954],{},"Concern",[653,3956,3957],{},"Recommendation",[660,3959,3960,3971,3979,3990,4004],{},[650,3961,3962,3965],{},[665,3963,3964],{},"Terminal output",[665,3966,3967,3970],{},[563,3968,3969],{},"init.pretty: false"," — pretty-print is for local dev only",[650,3972,3973,3976],{},[665,3974,3975],{},"Drain latency",[665,3977,3978],{},"Batch or async HTTP drains; never block the turn on I\u002FO",[650,3980,3981,3984],{},[665,3982,3983],{},"Head sampling",[665,3985,3986,3989],{},[563,3987,3988],{},"init.sampling.rates"," — eve emits one event per turn, not per token",[650,3991,3992,3994],{},[665,3993,216],{},[665,3995,3996,3999,4000,4003],{},[563,3997,3998],{},"maxSessions"," (default ",[563,4001,4002],{},"256",") evicts oldest idle session state",[650,4005,4006,4009],{},[665,4007,4008],{},"Load",[665,4010,4011],{},"Hook handlers are O(1) per stream event; cost is dominated by your drain",[639,4013,336],{"id":4014},"options",[644,4016,4017,4027],{},[647,4018,4019],{},[650,4020,4021,4024],{},[653,4022,4023],{},"Option",[653,4025,4026],{},"Description",[660,4028,4029,4042,4063,4083,4099,4112,4133,4144],{},[650,4030,4031,4035],{},[665,4032,4033],{},[563,4034,89],{},[665,4036,4037,4038,4041],{},"Passed to ",[563,4039,4040],{},"initLogger()"," on first hook invocation",[650,4043,4044,4058],{},[665,4045,4046,2564,4049,2564,4052,2564,4055],{},[563,4047,4048],{},"drain",[563,4050,4051],{},"enrich",[563,4053,4054],{},"keep",[563,4056,4057],{},"plugins",[665,4059,4060,4061,963],{},"Same as HTTP integrations (",[547,4062,4057],{"href":474},[650,4064,4065,4069],{},[665,4066,4067],{},[563,4068,2713],{},[665,4070,4071,4074,4075,4078,4079,4082],{},[563,4072,4073],{},"'omit'"," (default), ",[563,4076,4077],{},"'preview'"," or ",[563,4080,4081],{},"'full'"," — how much of the user message and the agent response to record",[650,4084,4085,4090],{},[665,4086,4087],{},[563,4088,4089],{},"messagePreviewLength",[665,4091,4092,4093,4095,4096,963],{},"Characters kept in ",[563,4094,4077],{}," mode (default ",[563,4097,4098],{},"500",[650,4100,4101,4106],{},[665,4102,4103],{},[563,4104,4105],{},"sessionEvent",[665,4107,4108,4111],{},[563,4109,4110],{},"true"," emits one extra event per session, rolling up its turns",[650,4113,4114,4120],{},[665,4115,4116,2564,4118],{},[563,4117,2731],{},[563,4119,1834],{},[665,4121,4122,4123,1384,4126,4129,4130,4132],{},"Fallback token pricing (",[563,4124,4125],{},"ModelCost",[563,4127,4128],{},"evlog\u002Fai",") → ",[563,4131,2727],{},", used only when eve reports no cost",[650,4134,4135,4139],{},[665,4136,4137],{},[563,4138,3998],{},[665,4140,4141,4142,963],{},"In-memory session cap for context carry-over (default ",[563,4143,4002],{},[650,4145,4146,4154],{},[665,4147,4148,2564,4151],{},[563,4149,4150],{},"include",[563,4152,4153],{},"exclude",[665,4155,4156,4157,963],{},"Route-style filters on turn paths (",[563,4158,4159],{},"\u002Fsessions\u002F*\u002Fturns\u002F*",[639,4161,481],{"id":4162},"tail-sampling",[544,4164,4165,4166,4168],{},"Use ",[563,4167,4054],{}," to force-keep turns with failed tools or high token usage:",[726,4170,4172],{"className":815,"code":4171,"filename":811,"language":817,"meta":732,"style":732},"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",[563,4173,4174,4186,4198,4215,4241,4252,4261,4285,4296,4338,4368,4414,4418],{"__ignoreMap":732},[736,4175,4176,4178,4180,4182,4184],{"class":738,"line":739},[736,4177,881],{"class":824},[736,4179,884],{"class":824},[736,4181,833],{"class":887},[736,4183,890],{"class":832},[736,4185,893],{"class":828},[736,4187,4188,4190,4192,4194,4196],{"class":738,"line":850},[736,4189,935],{"class":899},[736,4191,812],{"class":828},[736,4193,857],{"class":887},[736,4195,942],{"class":832},[736,4197,945],{"class":828},[736,4199,4200,4203,4205,4207,4209,4211,4213],{"class":738,"line":871},[736,4201,4202],{"class":887}," keep",[736,4204,812],{"class":828},[736,4206,956],{"class":828},[736,4208,960],{"class":959},[736,4210,963],{"class":828},[736,4212,967],{"class":966},[736,4214,970],{"class":828},[736,4216,4217,4219,4222,4224,4227,4229,4232,4234,4236,4239],{"class":738,"line":878},[736,4218,1228],{"class":966},[736,4220,4221],{"class":832}," ai",[736,4223,990],{"class":828},[736,4225,4226],{"class":832}," ctx",[736,4228,979],{"class":828},[736,4230,4231],{"class":832},"context",[736,4233,979],{"class":828},[736,4235,1820],{"class":832},[736,4237,4238],{"class":824}," as",[736,4240,970],{"class":828},[736,4242,4243,4246,4249],{"class":738,"line":896},[736,4244,4245],{"class":899}," inputTokens",[736,4247,4248],{"class":828},"?:",[736,4250,4251],{"class":742}," number\n",[736,4253,4254,4257,4259],{"class":738,"line":932},[736,4255,4256],{"class":899}," outputTokens",[736,4258,4248],{"class":828},[736,4260,4251],{"class":742},[736,4262,4263,4266,4268,4271,4274,4277,4279,4282],{"class":738,"line":948},[736,4264,4265],{"class":899}," tools",[736,4267,4248],{"class":828},[736,4269,4270],{"class":742}," Array",[736,4272,4273],{"class":828},"\u003C{",[736,4275,4276],{"class":899}," success",[736,4278,812],{"class":828},[736,4280,4281],{"class":742}," boolean",[736,4283,4284],{"class":828}," }>\n",[736,4286,4287,4290,4293],{"class":738,"line":973},[736,4288,4289],{"class":828}," }",[736,4291,4292],{"class":828}," |",[736,4294,4295],{"class":742}," undefined\n",[736,4297,4298,4300,4303,4305,4307,4309,4311,4313,4316,4318,4321,4324,4326,4328,4330,4332,4334,4336],{"class":738,"line":1006},[736,4299,1228],{"class":966},[736,4301,4302],{"class":832}," totalTokens",[736,4304,990],{"class":828},[736,4306,956],{"class":899},[736,4308,1820],{"class":832},[736,4310,3391],{"class":828},[736,4312,1909],{"class":832},[736,4314,4315],{"class":828}," ??",[736,4317,1611],{"class":1485},[736,4319,4320],{"class":899},") ",[736,4322,4323],{"class":828},"+",[736,4325,956],{"class":899},[736,4327,1820],{"class":832},[736,4329,3391],{"class":828},[736,4331,1926],{"class":832},[736,4333,4315],{"class":828},[736,4335,1611],{"class":1485},[736,4337,1018],{"class":899},[736,4339,4340,4343,4345,4348,4351,4354,4356,4358,4360,4363,4365],{"class":738,"line":1012},[736,4341,4342],{"class":824}," if",[736,4344,956],{"class":899},[736,4346,4347],{"class":832},"totalTokens",[736,4349,4350],{"class":828}," >",[736,4352,4353],{"class":1485}," 10_000",[736,4355,4320],{"class":899},[736,4357,960],{"class":832},[736,4359,979],{"class":828},[736,4361,4362],{"class":832},"shouldKeep",[736,4364,990],{"class":828},[736,4366,4367],{"class":3886}," true\n",[736,4369,4370,4372,4374,4376,4378,4380,4382,4385,4387,4390,4392,4395,4397,4399,4401,4404,4406,4408,4410,4412],{"class":738,"line":1263},[736,4371,4342],{"class":824},[736,4373,956],{"class":899},[736,4375,1820],{"class":832},[736,4377,3391],{"class":828},[736,4379,1964],{"class":832},[736,4381,3391],{"class":828},[736,4383,4384],{"class":887},"some",[736,4386,890],{"class":899},[736,4388,4389],{"class":959},"t",[736,4391,967],{"class":966},[736,4393,4394],{"class":828}," !",[736,4396,4389],{"class":832},[736,4398,979],{"class":828},[736,4400,2013],{"class":832},[736,4402,4403],{"class":899},")) ",[736,4405,960],{"class":832},[736,4407,979],{"class":828},[736,4409,4362],{"class":832},[736,4411,990],{"class":828},[736,4413,4367],{"class":3886},[736,4415,4416],{"class":738,"line":1331},[736,4417,1009],{"class":828},[736,4419,4420,4422],{"class":738,"line":1340},[736,4421,1015],{"class":828},[736,4423,1018],{"class":832},[639,4425,4427],{"id":4426},"audit-logs","Audit logs",[544,4429,4430,4431,4433,4434,4437,4438,4441,4442,4445,4446,1380,4448,979],{},"Combine with ",[547,4432,378],{"href":384},": register ",[563,4435,4436],{},"auditEnricher()"," via ",[563,4439,4440],{},"init.plugins"," or a global plugin, and call ",[563,4443,4444],{},"log.audit()"," inside tools when a human approval gate fires. Tool rejections surface on ",[563,4447,2499],{},[563,4449,4450],{},"status: \"rejected\"",[639,4452,4454],{"id":4453},"run-locally","Run locally",[726,4456,4458],{"className":728,"code":4457,"language":731,"meta":732,"style":732},"git clone https:\u002F\u002Fgithub.com\u002FHugoRCD\u002Fevlog\ncd evlog\npnpm install\npnpm example eve\n",[563,4459,4460,4471,4479,4486],{"__ignoreMap":732},[736,4461,4462,4465,4468],{"class":738,"line":739},[736,4463,4464],{"class":742},"git",[736,4466,4467],{"class":745}," clone",[736,4469,4470],{"class":745}," https:\u002F\u002Fgithub.com\u002FHugoRCD\u002Fevlog\n",[736,4472,4473,4476],{"class":738,"line":850},[736,4474,4475],{"class":887},"cd",[736,4477,4478],{"class":745}," evlog\n",[736,4480,4481,4483],{"class":738,"line":871},[736,4482,730],{"class":742},[736,4484,4485],{"class":745}," install\n",[736,4487,4488,4490,4493],{"class":738,"line":878},[736,4489,730],{"class":742},[736,4491,4492],{"class":745}," example",[736,4494,752],{"class":745},[544,4496,4497,4498,4501,4502,4505,4506,4509,4510,4516],{},"The ",[563,4499,4500],{},"examples\u002Feve"," project is a ",[554,4503,4504],{},"support refund copilot"," (Clearbill SaaS): lookup customer → lookup order → issue refund, with eve approvals when amount > $100. Run ",[563,4507,4508],{},"pnpm example eve",", open ",[554,4511,4512],{},[547,4513,4514],{"href":4514,"rel":4515},"http:\u002F\u002Flocalhost:3000",[551],", and click a starter prompt.",[639,4518,4520],{"id":4519},"what-to-read-next","What to read next",[602,4522,4523,4531,4539,4545],{},[605,4524,4525,4530],{},[547,4526,4529],{"href":4527,"rel":4528},"https:\u002F\u002Feve.dev\u002Fdocs\u002Fguides\u002Fhooks",[551],"eve hooks guide",": stream event vocabulary",[605,4532,4533,4538],{},[547,4534,4537],{"href":4535,"rel":4536},"https:\u002F\u002Feve.dev\u002Fdocs\u002Fguides\u002Finstrumentation",[551],"eve instrumentation",": OTel spans (complementary)",[605,4540,4541,4544],{},[547,4542,4543],{"href":328},"AI SDK use case",": when you own the model loop directly",[605,4546,4547,4550],{},[547,4548,4549],{"href":143},"Adapters overview",": drain destinations",[4552,4553,4554],"style",{},"html pre.shiki code .sBMFI, html code.shiki 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