# Reference





The reference section is the source of truth. Inbound and outbound concept pages aim for *narrative*; reference pages aim for *completeness*.

<Cards>
  <Card icon="<PackageIcon />" title="Packages" href="/docs/reference/packages" description="Every @postel/* package — what it does, what it depends on, and whether it ships today." />

  <Card icon="<CodeIcon />" title="Core API" href="/docs/reference/core" description="Postel() / definePostelConfig(), PostelConfig, the lifecycle API, observability, pagination, and the shared utility types." />

  <Card icon="<InboxIcon />" title="Inbound API" href="/docs/reference/inbound" description="InboundSource config, verify(), every Verifier factory, JWKS, deduplication, and signFixture." />

  <Card icon="<SendIcon />" title="Outbound API" href="/docs/reference/outbound" description="OutboundConfig, the full OutboundApi, and every supporting type — endpoints, keys, tenants, replay, messages." />

  <Card icon="<RepeatIcon />" title="Strategies" href="/docs/reference/strategies" description="The retry, rate-limit, worker, signing, and KMS strategy factories." />

  <Card icon="<CodeIcon />" title="@postel/http" href="/docs/reference/http" description="The framework-agnostic gate every adapter is built on — outcomes, options, the error→status policy." />

  <Card icon="<RepeatIcon />" title="@postel/effect" href="/docs/reference/effect" description="The Effect-TS layer — PostelLive, PostelTag, and the typed error channel." />

  <Card icon="<AlertTriangleIcon />" title="Errors" href="/docs/reference/errors" description="Every PostelError subclass — its code, when it's thrown, and how to recover." />

  <Card icon="<FileTextIcon />" title="Specs & standards" href="/docs/project/specs" description="Wire format (AsyncAPI 3.0), DB schema (SQL DDL), capability specs, ADRs, conformance levels — on the Project tab." />
</Cards>

If a narrative page elsewhere contradicts a reference page, the reference page wins.