# Developer Guide

Technical reference for contributors and developers working on the Vellum Assistant platform. These docs cover architecture, security internals, the API surface, and the agent-driven development workflow.

### [Get Started](/docs/developer-guide/get-started)

[Developer on-ramp: repo layout, local dev setup, CLI, HTTP API, and SSE event stream.](/docs/developer-guide/get-started)

### [Architecture](/docs/developer-guide/architecture)

[Platform domains, repo structure, and how the runtime, clients, and gateway fit together.](/docs/developer-guide/architecture)

### [Security & Permissions](/docs/developer-guide/security)

[Sandbox model, credential storage, trust rules, and permission modes.](/docs/developer-guide/security)

### [Features & Capabilities](/docs/developer-guide/features)

[Integrations, dynamic skill authoring, browser automation, attachments, and media embeds.](/docs/developer-guide/features)

### [API & Communication](/docs/developer-guide/api)

[SSE event stream, event payloads, connection management, and remote access via SSH.](/docs/developer-guide/api)

### [Development Workflow](/docs/developer-guide/development-workflow)

[Claude Code slash commands, parallel PR execution, review loops, and the release pipeline.](/docs/developer-guide/development-workflow)