> ## Documentation Index
> Fetch the complete documentation index at: https://docs.tai42.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Concepts

> The core subsystems of the platform, one page per pillar.

The core subsystems of the platform, one page per pillar. Start with the layering
and the manifest — they explain how a server is built and what it loads — then read
the pillars you need.

## Foundations

<CardGroup cols={2}>
  <Card title="The layering" icon="sitemap" href="/concepts/layering">
    Contract, kit, skeleton, and the Studio.
  </Card>

  <Card title="The manifest" icon="scroll" href="/concepts/manifest">
    The single file a server loads at startup.
  </Card>

  <Card title="Tools and extensions" icon="wrench" href="/concepts/tools-and-extensions">
    Atoms of work and the clip-on powers over them.
  </Card>

  <Card title="Presets" icon="layer-group" href="/concepts/presets">
    Versioned, named wraps of a tool.
  </Card>
</CardGroup>

## Agents

<CardGroup cols={2}>
  <Card title="Agents" icon="robot" href="/concepts/agents">
    LLM-driven capabilities and how they are authored.
  </Card>

  <Card title="Deep agents" icon="diagram-project" href="/concepts/deep-agents">
    Multi-step agents and the ready-made set.
  </Card>
</CardGroup>

## Around the tool

<CardGroup cols={2}>
  <Card title="Interactions" icon="comments" href="/concepts/interactions">
    Human-in-the-loop, in-client and external.
  </Card>

  <Card title="Connectors" icon="plug" href="/concepts/connectors">
    OAuth connections to outside apps.
  </Card>

  <Card title="Hooks" icon="anchor" href="/concepts/hooks">
    Bind an inbound event topic to a tool.
  </Card>

  <Card title="Triggers and webhooks" icon="bolt" href="/concepts/triggers-and-webhooks">
    Firing tools from outside events.
  </Card>

  <Card title="Storage and resources" icon="database" href="/concepts/storage-and-resources">
    The ResourceManager and stored content.
  </Card>

  <Card title="Backends" icon="server" href="/concepts/backends">
    Where tools run: background, scheduled, distributed.
  </Card>
</CardGroup>

## Platform surfaces

<CardGroup cols={2}>
  <Card title="Access control" icon="shield-halved" href="/concepts/access-control">
    The jq-policy request-auth gate.
  </Card>

  <Card title="Accounts" icon="user-lock" href="/concepts/accounts">
    Human accounts, sessions, and login flows.
  </Card>

  <Card title="Config and secrets" icon="key" href="/concepts/config-and-secrets">
    Swappable config and secret providers.
  </Card>

  <Card title="Transports" icon="network-wired" href="/concepts/transports">
    HTTP, SSE, STDIO, and the UDS path.
  </Card>

  <Card title="Private tool sets" icon="box" href="/concepts/private-tool-sets">
    Scoped sub-MCP servers.
  </Card>

  <Card title="The MCP-citizen surface" icon="diagram-project" href="/concepts/mcp-citizen-surface">
    MCP-native features and the FastMCP escape hatch.
  </Card>

  <Card title="The versioning spine" icon="code-branch" href="/concepts/versioning-spine">
    One versioned-store primitive, many kinds.
  </Card>

  <Card title="Live operations" icon="gauge-high" href="/concepts/live-operations">
    Operate a server without a restart.
  </Card>

  <Card title="The marketplace" icon="store" href="/concepts/marketplace">
    The plugin index: listings, items, versions, advisories.
  </Card>
</CardGroup>