docs: update Learning Hub with CLI v1.0.40–v1.0.41 features (#1626)

Add documentation for features shipped in Copilot CLI v1.0.40 and
the v1.0.41 prerelease builds that weren't yet covered in the Hub:

- copilot-configuration-basics.md: document --attachment flag for
  attaching images/documents in prompt mode (-p)
- automating-with-hooks.md: extend the prompt mode security callout
  to cover the new GITHUB_COPILOT_PROMPT_MODE_EXTENSIONS env var
  (user extensions load by default; project extensions need opt-in)
- building-custom-agents.md: note that ACP clients receive the
  agent's live plan in real time for multi-step tasks (v1.0.40+)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
This commit is contained in:
github-actions[bot]
2026-05-06 10:05:48 +10:00
committed by GitHub
parent ce516684b5
commit 8788c5d142
3 changed files with 15 additions and 5 deletions
@@ -3,7 +3,7 @@ title: 'Building Custom Agents'
description: 'Learn how to create specialized GitHub Copilot agents with custom personas, tool integrations, and domain expertise.'
authors:
- GitHub Copilot Learning Hub Team
lastUpdated: 2026-05-04
lastUpdated: 2026-05-05
estimatedReadingTime: '10 minutes'
tags:
- agents
@@ -264,7 +264,7 @@ Keep agents focused—one persona per file. If you find an agent trying to do to
A: In VS Code, open Copilot Chat and use the agent picker dropdown at the top of the chat panel. Your custom agents appear alongside built-in options. You can also `@mention` an agent by name.
In Copilot CLI, custom agents are discoverable via the agent picker inside a session. Clients that integrate with Copilot CLI using the **Agent Coordination Protocol (ACP)** can also list available custom agents and switch between them programmatically via the `agent` session configuration option (v1.0.40+). This allows tools like Zed, Neovim plugins, and CI pipelines driving Copilot via ACP to surface the agent picker and switch agents without requiring a slash command.
In Copilot CLI, custom agents are discoverable via the agent picker inside a session. Clients that integrate with Copilot CLI using the **Agent Coordination Protocol (ACP)** can also list available custom agents and switch between them programmatically via the `agent` session configuration option (v1.0.40+). This allows tools like Zed, Neovim plugins, and CI pipelines driving Copilot via ACP to surface the agent picker and switch agents without requiring a slash command. ACP clients also receive the agent's **live plan** as it works through multi-step tasks (v1.0.40+), so they can display real-time progress to their users without waiting for each turn to complete.
**Q: Can agents use skills?**