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[bot] Update Learning Hub: VS Code 1.129 agent host, CLI v1.0.71 subagents, BYOK models, and prompt migration#2358

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[bot] Update Learning Hub: VS Code 1.129 agent host, CLI v1.0.71 subagents, BYOK models, and prompt migration#2358
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What was found

Copilot CLI v1.0.71 (2026-07-16)

  • /subagents model picker now preserves each agent's reasoning effort and context tier when reopened

VS Code 1.129 (2026-07-15)

  • Agent host (chat.agentHost.enabled): dedicated process for Copilot/Claude/Codex sessions, aligns with Copilot CLI/SDK, includes session-management tools (list/read/create/message sibling sessions), GitHub Enterprise support
  • ! command prefix in chat to run terminal commands directly without leaving the chat window
  • BYOK models now usable with the Copilot harness in the VS Code Agents window
  • Prompt-file-to-skill migration (experimental): chat.customizations.promptMigration.enabled automates converting *.prompt.md files to skill folders

What was updated

  • agents-and-subagents.md: Added VS Code Agent Host section (with session-management tools and GHE support); noted v1.0.71 /subagents picker preservation; updated platform comparison table
  • building-custom-agents.md: Added BYOK models note in the model selection section
  • copilot-configuration-basics.md: Added chat.agentHost.enabled setting section and ! terminal command prefix section
  • creating-effective-skills.md: Extended the prompts-vs-skills FAQ answer to document the new VS Code 1.129 prompt migration tool

Source announcements

Warning

Firewall blocked 3 domains

The following domains were blocked by the firewall during workflow execution:

  • code.visualstudio.com
  • github.blog
  • nishanil.github.io

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

network:
  allowed:
    - defaults
    - "code.visualstudio.com"
    - "github.blog"
    - "nishanil.github.io"

See Network Configuration for more information.

Generated by Learning Hub Updater · 114 AIC · ⌖ 8.17 AIC · ⊞ 5.8K ·

- agents-and-subagents: add VS Code Agent Host (1.129) section with
  session-management tools; note /subagents model picker now preserves
  reasoning effort and context tier (v1.0.71); update platform table
- building-custom-agents: add BYOK models usable with Copilot harness
  (VS Code 1.129); update model table
- copilot-configuration-basics: add chat.agentHost.enabled setting and
  '!' terminal command prefix from VS Code 1.129
- creating-effective-skills: document prompt-file-to-skill migration
  (experimental, chat.customizations.promptMigration.enabled, VS Code 1.129)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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