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

# Integrations

> Everything you connect once that every project inherits.

Agents are only as capable as the services they can reach. Integrations are the services, credentials, servers, and custom instructions you connect once — every project you build on pre.dev picks them up automatically.

<Note>
  Open your Integrations at **[pre.dev/projects/integrations](https://pre.dev/projects/integrations)**. Changes propagate to every project.
</Note>

## The four types

<CardGroup cols={2}>
  <Card title="OAuth Connectors" icon="plug" href="/coding-agent/integrations/oauth">
    Sign in once to let pre.dev read and write to external services on your behalf.
  </Card>

  <Card title="Agent Skills" icon="wand-magic-sparkles" href="/coding-agent/integrations/skills">
    Custom instructions injected into the agent prompt for every project.
  </Card>

  <Card title="MCP Servers" icon="server" href="/coding-agent/integrations/mcp-servers">
    Connect external tool servers to extend what pre.dev can do.
  </Card>

  <Card title="API Keys" icon="key" href="/coding-agent/integrations/api-keys">
    API keys and secrets for authenticating with third-party services.
  </Card>
</CardGroup>

## How agents use your integrations

When a build agent picks up a task, it scans your integrations and makes decisions:

* Needs to send email? It finds your **Resend** or **SendGrid** API key and wires it up in the `.env`.
* Needs to read your Linear issues? It uses the **Linear OAuth** connector you signed in with.
* Needs to follow a style guide? It picks up your **Agent Skill** that says "always use Tailwind, never write inline styles."
* Needs a custom tool outside our built-ins? It calls your **MCP Server** as if it were a native tool.

No placeholder credentials. No stub implementations. Agents build with the real thing.

## Security

* API keys are **encrypted at rest** and only decrypted inside sandboxed build agents
* OAuth tokens are scoped to the services you explicitly connect and revocable at any time
* No key or secret ever appears in generated code or PR diffs — they're injected via the project's `.env`
* Integrations are scoped to your account (or organization, for enterprise) and never shared between users