> ## Documentation Index
> Fetch the complete documentation index at: https://arklowdocs.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Arklow Documentation

Arklow's goal is to find your infrastructure's ideal supply and demand curve.

Work arrives from your services and queues. Arklow accepts it durably, routes it, and holds excess demand until the destination can absorb it. During a downstream slowdown, excess work remains in Arklow and is released as capacity recovers.

```mermaid actions={false} theme={null}
flowchart LR
    S["Sources"] --> A["Actions"]
    A --> R["Rules"]
    R --> G["Admission"]
    G --> D["Destinations"]
    D --> O["Outcomes"]
    O --> G
```

<br />

<Note>
  Arklow can also track work that happens externally. Use the [SDK](/resources/destinations/sdk/index) when attaching existing pipelines to Arklow is impractical.
</Note>

<Columns cols={2}>
  <Card title="Quickstart" icon="rocket" href="/quickstart">
    Send an action through Arklow and settle its first delivery.
  </Card>

  <Card title="How Arklow works" icon="puzzle-piece" href="/fundamentals/overview">
    One action across lanes, admission, shared capacity, and settlement.
  </Card>
</Columns>

## Core resources

<Columns cols={2}>
  <Card title="Actions" icon="bolt" href="/resources/actions/index">
    Define the work your platform performs.
  </Card>

  <Card title="Sources" icon="arrow-down-to-line" href="/resources/sources/index">
    Bring work in over HTTP or from a queue you already run.
  </Card>

  <Card title="Destinations" icon="arrow-up-from-line" href="/resources/destinations/index">
    Deliver work to webhooks, Pub/Sub, or SDK listeners.
  </Card>

  <Card title="Rules" icon="scale-balanced" href="/resources/rules/index">
    Route, tag, transform, skip, or terminate work before dispatch.
  </Card>
</Columns>

## Capacity management

<Columns cols={2}>
  <Card title="Admission control" icon="gauge" href="/fundamentals/admission-control">
    Waiting, running and unsettled limits, pacing, and caps.
  </Card>

  <Card title="Metrics" icon="chart-line" href="/resources/metrics/index">
    Add the telemetry that already describes your systems.
  </Card>

  <Card title="Capacity pools" icon="boxes-stacked" href="/resources/capacity-pools/index">
    Protect destinations that draw from the same underlying resource.
  </Card>

  <Card title="Scale targets" icon="arrow-up-right-dots" href="/resources/scale-targets/index">
    Connect protected work to capacity Arklow can recommend or manage.
  </Card>
</Columns>

## API reference

<Card title="OpenAPI" icon="code" href="https://api.arklow.io/swagger/ui/json" horizontal>
  Browse the complete HTTP API.
</Card>