[bot] Update Learning Hub with CLI v1.0.42–1.0.43 features (May 2026)#1648
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aaronpowell merged 1 commit intoMay 8, 2026
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- understanding-mcp-servers.md: add Troubleshooting section with MCP stderr diagnostics (v1.0.42+) and /mcp show usage guidance - copilot-configuration-basics.md: document -C startup flag (v1.0.42+), Auto mode server-side model routing (v1.0.43+), and /statusline username toggle (v1.0.43+) - agents-and-subagents.md: add rubber-duck agent experimental feature documentation (v1.0.42+) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Pull request overview
Updates the Learning Hub documentation to reflect GitHub Copilot CLI v1.0.42–v1.0.43 changes, focusing on MCP troubleshooting improvements, new CLI flags, model Auto routing behavior, and an experimental rubber-duck agent.
Changes:
- Added an MCP troubleshooting section documenting improved failure warnings (including stderr),
/mcp showusage, and common fixes. - Documented Auto mode server-side model routing,
/statuslineusername toggle, and the new-C <directory>startup flag. - Added an experimental “rubber-duck” agent subsection describing a multi-model subagent pattern.
Show a summary per file
| File | Description |
|---|---|
| website/src/content/docs/learning-hub/understanding-mcp-servers.md | Adds MCP connection troubleshooting guidance and expands best-practice troubleshooting tips. |
| website/src/content/docs/learning-hub/copilot-configuration-basics.md | Updates configuration docs for Auto routing, /statusline username toggle, and -C startup flag. |
| website/src/content/docs/learning-hub/agents-and-subagents.md | Documents the experimental rubber-duck agent and how to enable/select it. |
Copilot's findings
- Files reviewed: 3/3 changed files
- Comments generated: 3
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| ``` | ||
| ⚠ MCP server "postgres" failed to start | ||
| Error: connect ECONNREFUSED 127.0.0.1:5432 |
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| /mcp show # list all servers and their status | ||
| /mcp show postgres # inspect a specific server |
| /agent # open the agent picker and select rubber-duck | ||
| ``` | ||
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| Because it runs as a sub-agent layer rather than replacing your primary model, you keep your current session model and context while the rubber-duck analysis runs in the background. |
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What's new
Updates based on CLI releases v1.0.42 and v1.0.43 (released 2026-05-06), covering the past 7 days of Copilot changes.
New features found
-C <directory>startup flag (likegit -C)/experimental)/statuslinepicker gains a username toggle to show active accountSections updated
understanding-mcp-servers.md/mcp showto check server status and diagnose failurescopilot-configuration-basics.md/statuslinedescription to mention the new username account toggle (v1.0.43+)-Cstartup flag to CLI Startup Flags section (v1.0.42+)agents-and-subagents.mdSource announcements