[bot] Add model fallback lists, CIMD OAuth, and recent model updates to Learning Hub

[github-actions]

Summary

Checked GitHub Copilot CLI changelog (v1.0.79 – v1.0.83, covering the last ~7 days) for updates relevant to the Learning Hub (excluding cli-for-beginners, which is maintained separately).

New features found

• Custom agent model fallback lists (v1.0.83): model in agent frontmatter can now be an array tried in order, with model-policy: required to lock model changes to that list.
• MCP OAuth CIMD support (v1.0.83): Client ID Metadata Document support for MCP OAuth sign-in.
• New models: claude-fable-5.1 (v1.0.83), kimi-k3 (v1.0.79) — supplementing existing entries for Grok 4.5/4.6, Gemini 3.7 Flash, Claude Opus 5.
• Retired Claude/Gemini models removed from the /model picker (v1.0.83) — noted for accuracy.

Pages updated

• website/src/content/docs/learning-hub/building-custom-agents.md — documented model fallback arrays and model-policy.
• website/src/content/docs/learning-hub/copilot-configuration-basics.md — added kimi-k3, claude-fable-5.1, and note on retired model removal to the model aliases section.
• website/src/content/docs/learning-hub/understanding-mcp-servers.md — documented CIMD support for MCP OAuth.

All three pages had their lastUpdated front matter bumped to 2026-09-04.

Source

• https://github.com/github/copilot-cli/blob/main/changelog.md (releases 1.0.79–1.0.83, 2026-08-10 to 2026-09-04)

No new dedicated page was warranted — these are incremental feature additions to existing documented areas rather than a major new capability requiring standalone documentation.

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.

Generated by Learning Hub Updater · auto · 69.4 AIC · ⌖ 7.25 AIC · ⊞ 8.7K · ◷

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