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Same philosophy as HTTP logging: ",[598,599,600],"strong",{},"one command execution → one structured event",", not a stream of analytics calls.",[603,604,605,630,644,658],"code-group",{},[606,607,613],"pre",{"className":608,"code":609,"filename":610,"language":611,"meta":612,"style":612},"language-bash shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","pnpm add @evlog\u002Ftelemetry\n","pnpm","bash","",[585,614,615],{"__ignoreMap":612},[616,617,620,623,627],"span",{"class":618,"line":619},"line",1,[616,621,610],{"class":622},"sBMFI",[616,624,626],{"class":625},"sfazB"," add",[616,628,629],{"class":625}," @evlog\u002Ftelemetry\n",[606,631,634],{"className":608,"code":632,"filename":633,"language":611,"meta":612,"style":612},"bun add @evlog\u002Ftelemetry\n","bun",[585,635,636],{"__ignoreMap":612},[616,637,638,640,642],{"class":618,"line":619},[616,639,633],{"class":622},[616,641,626],{"class":625},[616,643,629],{"class":625},[606,645,648],{"className":608,"code":646,"filename":647,"language":611,"meta":612,"style":612},"yarn add @evlog\u002Ftelemetry\n","yarn",[585,649,650],{"__ignoreMap":612},[616,651,652,654,656],{"class":618,"line":619},[616,653,647],{"class":622},[616,655,626],{"class":625},[616,657,629],{"class":625},[606,659,662],{"className":608,"code":660,"filename":661,"language":611,"meta":612,"style":612},"npm install @evlog\u002Ftelemetry\n","npm",[585,663,664],{"__ignoreMap":612},[616,665,666,668,671],{"class":618,"line":619},[616,667,661],{"class":622},[616,669,670],{"class":625}," install",[616,672,629],{"class":625},[582,674,675,676,679,680,683],{},"You get command name, sanitized flags, duration, and outcome automatically. Call ",[585,677,678],{},"telemetry.set()"," only when you have extra counters, numbers and booleans by default. Raw ",[585,681,682],{},"argv"," is never read; disclosure is generated from your runtime config so it cannot drift from what you actually collect.",[685,686,689,692,842],"prompt",{":actions":687,"description":688,"icon":112},"[\"copy\",\"cursor\",\"claude\"]","Add anonymous telemetry to my CLI or script",[582,690,691],{},"Add privacy-respecting telemetry to my CLI, script, or GitHub Action with @evlog\u002Ftelemetry.",[693,694,695,711,718,732,742,760,774,787,793,804,815],"ul",{},[696,697,698,699,702,703,706,707,710],"li",{},"Detect my entrypoint: citty CLI (",[585,700,701],{},"withTelemetry","), standalone script (",[585,704,705],{},"createTelemetry","), or GitHub Actions (",[585,708,709],{},"createGitHubActionsTelemetry",")",[696,712,713,714,717],{},"Install: ",[585,715,716],{},"pnpm add @evlog\u002Ftelemetry"," (or npm\u002Fyarn\u002Fbun)",[696,719,720,721,724,725,728,729],{},"Citty: wrap the root command in ",[585,722,723],{},"withTelemetry()"," in ",[585,726,727],{},"src\u002Findex.ts"," and add ",[585,730,731],{},"defineTelemetryCommands({ name: TOOL })",[696,733,734,735,738,739],{},"Script \u002F migrator: ",[585,736,737],{},"createTelemetry({ name, version })"," and wrap each logical unit with ",[585,740,741],{},"t.run('command', fn)",[696,743,744,745,748,749,752,753,756,757],{},"GitHub Actions: ",[585,746,747],{},"createGitHubActionsTelemetry()",". Only ",[585,750,751],{},"GITHUB_ACTION"," \u002F ",[585,754,755],{},"GITHUB_EVENT_NAME"," are injected into ",[585,758,759],{},"custom",[696,761,762,763,752,766,769,770,773],{},"Declare ",[585,764,765],{},"collect.flags",[585,767,768],{},"collect.fields"," for any string values you need beyond the ",[585,771,772],{},"\"\u003Cset>\""," marker",[696,775,776,777,779,780,782,783],{},"Put your product schema in ",[585,778,759],{}," via ",[585,781,678],{},", see ",[590,784,786],{"href":785},"\u002Fuse-cases\u002Ftelemetry\u002Freference#extending-the-schema","Extending the schema",[696,788,789,790,792],{},"Call ",[585,791,678],{}," for business counters (numbers\u002Fbooleans) inside handlers or helpers on the same async stack",[696,794,795,796,799,800,803],{},"Run ",[585,797,798],{},"generateDisclosure()"," and commit ",[585,801,802],{},"TELEMETRY.md"," beside the tool",[696,805,806,807,810,811,814],{},"Bake an ingestion URL in ",[585,808,809],{},"endpoint"," (or ",[585,812,813],{},"EVLOG_TELEMETRY_ENDPOINT","). The local outbox is a buffer, not the destination",[696,816,817,818,821,822,825,826,829,830,833,834,837,838,841],{},"Ship ",[585,819,820],{},"POST \u002Fapi\u002Ftelemetry\u002Fingest"," on my app: use ",[585,823,824],{},"parseIngestBody()"," from ",[585,827,828],{},"@evlog\u002Ftelemetry\u002Fingest"," with ",[585,831,832],{},"allowedTools"," + ",[585,835,836],{},"allowedCustomKeys",", dedupe on ",[585,839,840],{},"idempotencyKey",", return 204 on success",[582,843,844,845],{},"Docs: ",[590,846,847],{"href":847,"rel":848},"https:\u002F\u002Fwww.evlog.dev\u002Fuse-cases\u002Ftelemetry\u002Foverview",[594],[850,851,853],"h2",{"id":852},"from-cli-to-your-backend","From CLI to your backend",[582,855,856,857,860,861,864,865,868],{},"The disk outbox (",[585,858,859],{},"~\u002F.config\u002F{toolName}\u002Ftelemetry\u002Foutbox.ndjson",") is a ",[598,862,863],{},"reliability buffer",", not where telemetry lives long-term. Each run appends one event locally, then the HTTP drain POSTs the backlog to ",[598,866,867],{},"your"," ingestion endpoint. Short-lived CI jobs and offline machines drain on the next invocation.",[870,871,872,882,893,901,911,921,930],"ol",{},[696,873,874,877,878,881],{},[598,875,876],{},"Run",": ",[585,879,880],{},"my-tool doctor"," executes on the user's machine",[696,883,884,877,887,889,890],{},[598,885,886],{},"Capture",[585,888,587],{}," sanitizes flags, checks consent, and records one ",[585,891,892],{},"RunEvent",[696,894,895,898,899],{},[598,896,897],{},"Buffer",": the event appends to ",[585,900,859],{},[696,902,903,906,907,910],{},[598,904,905],{},"Send",": on flush, POST ",[585,908,909],{},"{ events: RunEvent[] }"," to your ingest URL",[696,912,913,877,916,918,919,710],{},[598,914,915],{},"Validate",[585,917,824],{}," allowlists tools and custom keys (",[590,920,431],{"href":432},[696,922,923,926,927,929],{},[598,924,925],{},"Store",": dedupe on ",[585,928,840],{},", then DB \u002F warehouse \u002F evlog drain",[696,931,932,935,936,939],{},[598,933,934],{},"Ack",": on ",[585,937,938],{},"2xx",", delivered keys are removed from the outbox",[606,941,946],{"className":942,"code":944,"language":945,"meta":612},[943],"language-text","CLI → @evlog\u002Ftelemetry → outbox.ndjson → POST \u002Fingest → validate → store\n","text",[585,947,944],{"__ignoreMap":612},[582,949,950],{},"Nothing is sent until you configure an endpoint and the server returns a success status. Until then, events stay in the outbox (or are purged on opt-out).",[850,952,954],{"id":953},"why-install-it","Why install it",[582,956,957],{},"You can wire anonymous usage telemetry yourself: outbox file, consent flags, flag sanitization, disclosure markdown, ingest validation, first-run notice. Or you add one dependency and get the evlog playbook baked in.",[959,960,962],"h3",{"id":961},"what-you-get-for-28-kb","What you get for ~28 KB",[964,965,966,977],"table",{},[967,968,969],"thead",{},[970,971,972,975],"tr",{},[973,974],"th",{},[973,976],{},[978,979,980,997,1012,1032],"tbody",{},[970,981,982,988],{},[983,984,985],"td",{},[598,986,987],{},"Published size",[983,989,990,991,993,994,996],{},"~28 KB ESM (",[585,992,587],{},"), ~8.6 KB gzip — standalone, no dependency on ",[585,995,595],{}," core",[970,998,999,1004],{},[983,1000,1001],{},[598,1002,1003],{},"Server ingest only",[983,1005,1006,1008,1009,1011],{},[585,1007,828],{}," ~5 KB (~1.7 KB gzip) — ",[585,1010,824],{}," without pulling citty wiring into your API",[970,1013,1014,1019],{},[983,1015,1016],{},[598,1017,1018],{},"Runtime deps",[983,1020,1021,833,1024,1027,1028,1031],{},[585,1022,1023],{},"citty",[585,1025,1026],{},"std-env"," only — both ",[585,1029,1030],{},"sideEffects: false",", tree-shakeable ESM",[970,1033,1034,1039],{},[983,1035,1036],{},[598,1037,1038],{},"Node",[983,1040,1041,1042,1044],{},"18+ · ESM · ",[585,1043,1030],{}," on the package",[959,1046,1048],{"id":1047},"fits-wherever-your-code-runs","Fits wherever your code runs",[964,1050,1051,1064],{},[967,1052,1053],{},[970,1054,1055,1058,1061],{},[973,1056,1057],{},"Surface",[973,1059,1060],{},"Entry",[973,1062,1063],{},"Lines of integration",[978,1065,1066,1084,1102,1123],{},[970,1067,1068,1073,1078],{},[983,1069,1070],{},[598,1071,1072],{},"citty CLI",[983,1074,1075,1077],{},[585,1076,723],{}," on the root command",[983,1079,1080,1081],{},"One wrapper + optional ",[585,1082,1083],{},"defineTelemetryCommands()",[970,1085,1086,1091,1099],{},[983,1087,1088],{},[598,1089,1090],{},"Script \u002F migrator",[983,1092,1093,833,1096],{},[585,1094,1095],{},"createTelemetry()",[585,1097,1098],{},"t.run()",[983,1100,1101],{},"Wrap each logical run",[970,1103,1104,1109,1113],{},[983,1105,1106],{},[598,1107,1108],{},"GitHub Actions",[983,1110,1111],{},[585,1112,747],{},[983,1114,1115,1116,752,1119,1122],{},"Same as script; ",[585,1117,1118],{},"ghaAction",[585,1120,1121],{},"ghaEvent"," auto-injected",[970,1124,1125,1130,1136],{},[983,1126,1127],{},[598,1128,1129],{},"Your API (ingest)",[983,1131,1132,825,1134],{},[585,1133,824],{},[585,1135,828],{},[983,1137,1138],{},"One validator + one POST route",[582,1140,1141,1142,1145],{},"No framework lock-in. No PostHog \u002F Segment \u002F custom analytics SDK. No second schema to maintain, since disclosure is generated from the same ",[585,1143,1144],{},"collect"," config the CLI uses at runtime.",[959,1147,1149],{"id":1148},"what-you-skip-building","What you skip building",[693,1151,1152,1157,1166,1169,1177,1180,1186,1189],{},[696,1153,1154,1155,710],{},"Privacy-safe flag capture (never reads raw ",[585,1156,682],{},[696,1158,1159,752,1162,1165],{},[585,1160,1161],{},"DO_NOT_TRACK",[585,1163,1164],{},"EVLOG_TELEMETRY"," \u002F persisted opt-out with outbox purge",[696,1167,1168],{},"Disk outbox with lockfile, stale-lock recovery, and backlog drain",[696,1170,1171,1172,833,1174,710],{},"Auto-generated disclosure (",[585,1173,802],{},[585,1175,1176],{},"telemetry status",[696,1178,1179],{},"First-run notice with opt-out instructions",[696,1181,1182,1183,1185],{},"Typed ",[585,1184,678],{}," with allowlisted string fields",[696,1187,1188],{},"Server-side ingest validation aligned with the CLI envelope",[696,1190,1191,1192],{},"Hard guarantee: ",[598,1193,1194],{},"telemetry never throws, never blocks exit",[959,1196,1198],{"id":1197},"the-payoff","The payoff",[582,1200,1201],{},"Once ingest is live you can answer product questions that CLI authors usually guess at:",[693,1203,1204,1215,1226,1233,1240],{},[696,1205,1206,1207,1209,1210,1209,1213,710],{},"Which commands are actually used (",[585,1208,119],{}," vs ",[585,1211,1212],{},"sync",[585,1214,1176],{},[696,1216,1217,1218,1221,1222,1225],{},"Where runs fail (",[585,1219,1220],{},"outcome",", ",[585,1223,1224],{},"errorCode",", version breakdown)",[696,1227,1228,1229,1232],{},"How long operations take (",[585,1230,1231],{},"durationMs"," per command)",[696,1234,1235,1236,1239],{},"Which versions are still in the wild (",[585,1237,1238],{},"tool.version"," on every event)",[696,1241,1242,1243,1221,1246,1221,1249,710],{},"Whether CI or local dev dominates (",[585,1244,1245],{},"env.ci",[585,1247,1248],{},"env.agent",[585,1250,1251],{},"env.tty",[582,1253,1254],{},"All from one wide event per run, the same mental model as evlog on the server, without bolting a browser analytics stack onto a terminal tool.",[1256,1257,1260,1261,877,1268,1221,1271,1274,1275,1277],"callout",{"color":1258,"icon":1259},"neutral","i-lucide-package","Try it locally: ",[590,1262,1265],{"href":1263,"rel":1264},"https:\u002F\u002Fgithub.com\u002Fevloghq\u002Fevlog\u002Ftree\u002Fmain\u002Fexamples\u002Ftelemetry-playground",[594],[585,1266,1267],{},"examples\u002Ftelemetry-playground",[585,1269,1270],{},"pnpm run cli -- doctor",[585,1272,1273],{},"EVLOG_TELEMETRY_DEBUG=1"," to inspect payloads, ",[585,1276,1176],{}," for disclosure.",[850,1279,1281],{"id":1280},"see-also","See also",[693,1283,1284,1289,1294,1299,1305],{},[696,1285,1286,1288],{},[590,1287,426],{"href":427},": citty, scripts, GitHub Actions, delivery config",[696,1290,1291,1293],{},[590,1292,431],{"href":432},": server endpoint, validation, storage",[696,1295,1296,1298],{},[590,1297,436],{"href":437},": envelope, schema extensions, disclosure, consent",[696,1300,1301,1304],{},[590,1302,1303],{"href":393},"Audit",": wide events for security-sensitive actions",[696,1306,1307,1309],{},[590,1308,508],{"href":509},": forward ingested events into Axiom, Datadog, OTLP, or a custom store",[1311,1312,1313],"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);}",{"title":612,"searchDepth":1315,"depth":1315,"links":1316},2,[1317,1318,1325],{"id":852,"depth":1315,"text":853},{"id":953,"depth":1315,"text":954,"children":1319},[1320,1322,1323,1324],{"id":961,"depth":1321,"text":962},3,{"id":1047,"depth":1321,"text":1048},{"id":1148,"depth":1321,"text":1149},{"id":1197,"depth":1321,"text":1198},{"id":1280,"depth":1315,"text":1281},"One event per run for CLIs and automation, with privacy-safe flags, consent, an outbox, and disclosure generated from the same config.","md",[1329,1331,1332],{"label":426,"icon":429,"to":427,"color":1258,"variant":1330},"subtle",{"label":431,"icon":434,"to":432,"color":1258,"variant":1330},{"label":436,"icon":84,"to":437,"color":1258,"variant":1330},{},{"title":41,"icon":44},{"title":124,"description":1326},"Gb7FHqy5yh1KpnsU8Ghkee_rw-LOn-NRxW1nZ6xcYk8",[1338,1340],{"title":415,"path":416,"stem":417,"description":1339,"icon":84,"children":-1},"File system, Axiom, and Postgres recipes for audit logs, plus mockAudit for tests and the full API reference.",{"title":426,"path":427,"stem":428,"description":1341,"icon":429,"children":-1},"Wire @evlog\u002Ftelemetry into citty CLIs, standalone scripts, and GitHub Actions — delivery config, automatic flag capture, telemetry.set(), and debug mode.",1789915913882]