[bot] Document multi-model agent lists and MCP CIMD OAuth support

[github-actions]

Summary

Reviewed the past week of GitHub Copilot CLI changelog entries (through v1.0.83) against the Learning Hub and found two new capabilities not yet documented:

1. Multi-model agent lists with model-policy (CLI v1.0.83): Custom agents can now list several models in the model frontmatter field, tried in order until one is available to the user. Pairing this with model-policy: required keeps the model locked to that list for the session.
2. Client ID Metadata Document (CIMD) support for MCP OAuth (CLI v1.0.83): The CLI can now use a CIMD instead of Dynamic Client Registration when signing in to MCP servers over OAuth.

Other recent changelog entries (v1.0.79–v1.0.83) were checked against existing pages and found to already be documented (plugins dashboard availability, hook OpenTelemetry trace context, canvas extensions bundling, etc.) or out of scope for this update.

Sections updated

• website/src/content/docs/learning-hub/building-custom-agents.md — added a note under the model frontmatter field describing multi-model lists and model-policy: required.
• website/src/content/docs/learning-hub/understanding-mcp-servers.md — added a note under Authentication describing CIMD-based OAuth sign-in for MCP servers.
• Bumped lastUpdated on both pages.

Source

• https://github.com/github/copilot-cli/blob/main/changelog.md (v1.0.83 entry)

Warning

Firewall blocked 1 domain

The following domain was blocked by the firewall during workflow execution:

• github.blog

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "github.blog"

See Network Configuration for more information.

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