# Core

> Core is an operating system for autonomous employees and an account for agent capabilities, inference, and tools.

## Start here

- [Agent setup](https://core.so/SKILL.md): Fast browser-approved account connection for Codex, Claude Code, and other agents.
- [MCP account access](https://docs.core.so/mcp-account-access.md): Account tools, asynchronous operations, approvals, and credential boundaries.

## Product documentation

- [Model router and project keys](https://docs.core.so/api-keys-and-inference.md): Create a project-scoped core_sk_ key and call routed models through Core.
- [Billing and credits](https://docs.core.so/billing-and-credits.md): Understand the shared organization balance, spend attribution, limits, and failure charges.
- [Building apps with Core Agent](https://docs.core.so/building-apps.md): Ask an agent to build, preview, connect Core services, and publish an application.
- [Core Agent](https://docs.core.so/core-agent.md): Understand Core's durable agent, tasks, runs, workspace, and team access.
- [Tool store and rankings](https://docs.core.so/core-store.md): Search callable capabilities, distinguish supply types, and interpret trust and ranking data.
- [MCP account access](https://docs.core.so/mcp-account-access.md): Connect an AI agent once, select the correct Core primitive, and handle operations and approvals.
- [Publishing tools](https://docs.core.so/publishing-supply.md): Publish a public MCP tool, pin its schema, and understand dispatch eligibility.