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Each page in this section ships with a ",[591,592,593],"code",{},"::prompt"," block you can drop into Cursor \u002F Claude to scaffold the integration in your own app.",[596,597,599],"h2",{"id":598},"mental-model","Mental model",[601,602,608],"pre",{"className":603,"code":605,"language":606,"meta":607},[604],"language-text","your app code\n     │\n     │  emit\n     ▼\n┌──────────────────────────────────────────────────────────────────┐\n│   evlog pipeline                                                 │\n│                                                                  │\n│   request lifecycle  →  enrich  →  tail sample  →  drain         │\n│                                                                  │\n└──────────────────────────────────────────────────────────────────┘\n     │                                                  │\n     │  observe (no mutation)                           │  ship\n     ▼                                                  ▼\n┌─────────────────────────────────────────┐    ┌─────────────────────┐\n│   stream (in-process + SSE bridge)      │    │   custom drains     │\n│   fs reader (NDJSON history)            │    │   drain pipeline    │\n│   diagnostics channel (evlog.event)     │    │   (batch + fanout)  │\n│   consumer recipes (devtools, dashboards)│    │                     │\n└─────────────────────────────────────────┘    └─────────────────────┘\n","text","",[591,609,605],{"__ignoreMap":607},[596,611,613],{"id":612},"three-ways-to-extend","Three ways to extend",[615,616,618],"h3",{"id":617},"observe-the-pipeline-no-mutation","Observe the pipeline (no mutation)",[574,620,621,622,625,626,629],{},"Subscribe to events without changing what gets emitted. The stream is the live feed, the fs reader is the historic log, the diagnostics channel lets a consumer subscribe by channel name alone, and consumer recipes show you how to wire any of them to a devtool, dashboard, CLI tail, or ",[591,623,624],{},"curl"," + ",[591,627,628],{},"jq",".",[631,632,633,646],"table",{},[634,635,636],"thead",{},[637,638,639,643],"tr",{},[640,641,642],"th",{},"You want to…",[640,644,645],{},"Use",[647,648,649,660,669,683],"tbody",{},[637,650,651,655],{},[652,653,654],"td",{},"Subscribe to live events (in-process or over SSE for browsers \u002F CLIs)",[652,656,657],{},[658,659,454],"a",{"href":455},[637,661,662,665],{},[652,663,664],{},"Replay or tail historic events from disk",[652,666,667],{},[658,668,468],{"href":469},[637,670,671,678],{},[652,672,673,674,625,676],{},"Build a small consumer panel, devtool, or pipe to ",[591,675,624],{},[591,677,628],{},[652,679,680],{},[658,681,682],{"href":473},"Consumer recipes",[637,684,685,688],{},[652,686,687],{},"Let a consumer subscribe without importing evlog, or reach a Cloudflare Tail Worker",[652,689,690],{},[658,691,464],{"href":465},[615,693,695],{"id":694},"plug-into-the-pipeline","Plug into the pipeline",[574,697,698,699,702],{},"Hook into the pipeline at one or more of its lifecycle stages. The four pages below cover the entire extension surface. Pick one when you have a single concern, pick ",[591,700,701],{},"definePlugin"," when you have several.",[631,704,705,713],{},[634,706,707],{},[637,708,709,711],{},[640,710,642],{},[640,712,645],{},[647,714,715,724,733,742],{},[637,716,717,720],{},[652,718,719],{},"React to lifecycle events from a single cohesive object (multiple hooks share state)",[652,721,722],{},[658,723,477],{"href":478},[637,725,726,729],{},[652,727,728],{},"Add a derived field on every event automatically",[652,730,731],{},[658,732,481],{"href":482},[637,734,735,738],{},[652,736,737],{},"Decide post-hoc whether to keep an event (status, duration, custom logic)",[652,739,740],{},[658,741,485],{"href":486},[637,743,744,755],{},[652,745,746,747,750,751,754],{},"Identify your evlog traffic on the receiver side (override ",[591,748,749],{},"User-Agent"," \u002F ",[591,752,753],{},"X-Evlog-Source",")",[652,756,757],{},[658,758,489],{"href":490},[615,760,762],{"id":761},"build-your-own-bricks","Build your own bricks",[574,764,765],{},"When the built-in adapters or framework integrations don't cover what you need, the toolkit lets you build your own with the same shape and ergonomics.",[631,767,768,776],{},[634,769,770],{},[637,771,772,774],{},[640,773,642],{},[640,775,645],{},[647,777,778,787,796],{},[637,779,780,783],{},[652,781,782],{},"Ship events to a backend without a built-in adapter (HTTP or any other transport)",[652,784,785],{},[658,786,494],{"href":495},[637,788,789,792],{},[652,790,791],{},"Wrap any drain in batch + retry + fanout for production",[652,793,794],{},[658,795,499],{"href":500},[637,797,798,801],{},[652,799,800],{},"Support a framework that's not in the list, or a non-HTTP runtime",[652,802,803],{},[658,804,805],{"href":460},"Custom framework integration",[596,807,809],{"id":808},"what-works-where","What works where",[574,811,812,813,816,817,820,821,824],{},"Only the ",[658,814,815],{"href":455},"stream"," (in-process bus + SSE bridge) is ",[578,818,819],{},"local-only",": it lives inside one Node \u002F Bun \u002F Deno process and does not work on serverless platforms (Vercel Functions, Cloudflare Workers, AWS Lambda). The ",[658,822,823],{"href":455},"stream page"," explains the constraint in detail.",[574,826,827,828,830,831,830,834,830,837,830,840,830,843,830,846,830,849,852],{},"Everything else, from ",[658,829,468],{"href":469},", ",[658,832,833],{"href":478},"plugins",[658,835,836],{"href":482},"custom enrichers",[658,838,839],{"href":486},"tail sampling",[658,841,842],{"href":490},"identity headers",[658,844,845],{"href":495},"custom drains",[658,847,848],{"href":500},"drain pipeline",[658,850,851],{"href":460},"custom framework integration",", runs everywhere evlog runs.",{"title":607,"searchDepth":854,"depth":854,"links":855},2,[856,857,863],{"id":598,"depth":854,"text":599},{"id":612,"depth":854,"text":613,"children":858},[859,861,862],{"id":617,"depth":860,"text":618},3,{"id":694,"depth":860,"text":695},{"id":761,"depth":860,"text":762},{"id":808,"depth":854,"text":809},"Observe what flows through the pipeline, plug into it, or build your own bricks. The map of every extension point evlog exposes.","md",[867,871,872],{"label":454,"icon":868,"to":455,"color":869,"variant":870},"i-lucide-radio","neutral","subtle",{"label":477,"icon":452,"to":478,"color":869,"variant":870},{"label":873,"icon":497,"to":495,"color":869,"variant":870},"Custom Drains",{},{"title":36,"icon":452},{"title":569,"description":864},"V_xDrKj8z8Ae6zV4vG6-iM5Kremy5pcLHNHZIqRw0Ss",[879,881],{"title":440,"path":441,"stem":442,"description":880,"icon":443,"children":-1},"One evlog wide event per eve agent turn: token usage, tool executions, and business context, through your own drains and tail sampling.",{"title":454,"path":455,"stem":456,"description":882,"icon":457,"children":-1},"Subscribe to wide events flowing through evlog — in-process with createStreamDrain, or over the network with the local SSE stream server.",1788921634837]