# Inkling > Inkling is a single-tenant headless CMS. One Bun process serves its admin, > APIs, media, plugins, realtime socket, and health endpoint; consuming sites > render published content from the delivery API. Use the credential for the audience you are acting as. A delivery key (`ink_…`) can only read published content. An agent key (`inkagt_…`) reaches the admin API within its explicit grants and the issuing account's current role. They are never interchangeable. For a coding task, read the architecture and changelog before editing. For a site-management task, start with the agent operations guide and discover the site's content types before reading or changing entries. ## Start here - [Agent operations guide](https://wess.io/inkling/agent-guide.md): Connect an MCP client, choose safe grants, discover a site, make audited changes, and diagnose refusals. - [Delivery API guide](https://wess.io/inkling/delivery.md): Authentication, routes, response shapes, caching, realtime invalidation, and a complete fetch example. - [Full Inkling context](https://wess.io/inkling/llms-full.txt): The longer codebase and product reference when the focused guides are not enough. ## Maintain Inkling - [Architecture](https://raw.githubusercontent.com/wess/inkling/main/docs/ARCHITECTURE.md): Composition root, route boundaries, persistence, plugins, security, realtime, and operational invariants. - [Repository guide](https://raw.githubusercontent.com/wess/inkling/main/README.md): Setup, capabilities, examples, commands, and release links. - [Changelog](https://raw.githubusercontent.com/wess/inkling/main/CHANGELOG.md): Current behavior, migrations, and release history. - [Configuration reference](https://raw.githubusercontent.com/wess/inkling/main/.env.example): Every runtime variable and its default or requirement. ## Optional - [Human documentation](https://wess.io/inkling/): Start guide, concepts, tutorials, and reference pages. - [Source repository](https://github.com/wess/inkling): TypeScript source, tests, migrations, and bundled plugins.