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# Visual Studio Code 1.143 (Insiders)

**[Visual Studio Code](https://daily.dev/sources/vscode)** · 3 min read · 0 upvotes · 0 comments

## Summary

VS Code's 1.143 Insiders build adds a stream of Agent Host and Copilot chat improvements. The editor's diagnostic highlight limit rises to 5,000 per file, with a language status warning when limits are hit. Agent Host chats gain live output for detached background shells, a 'Stop Shell' action, and '/fork <title>' or '/fork prompt <prompt>' commands. Workspace-root .mcp.json files support environment variable expansion with '${VAR}' and '${VAR:-default}' for MCP server configuration values, and experimental Voice Mode adds GPT-Live support with your OpenAI API key where client BYOK is allowed.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://code.visualstudio.com/updates/v1_143>

## Questions this post answers

### How do I use environment variable expansion in VS Code's .mcp.json file?

Workspace-root .mcp.json files support '${VAR}' and '${VAR:-default}' syntax for environment variable expansion in MCP server configuration values, as of VS Code 1.143 Insiders. This lets you reference environment variables directly in MCP server configs, with a fallback default value when the variable is unset.

_Developers wiring up MCP servers can track config syntax changes like this one on daily.dev._

### How do I stop a background shell running in a VS Code Copilot Agent Host chat?

VS Code 1.143 Insiders adds a 'Stop Shell' action for both attached and detached background shells in Agent Host chats, letting you stop a running command without ending the whole chat session. Detached background shells can also show their live output in the chat after the response completes.

_Those relying on agent host shells for long-running tasks follow workflow updates like this on daily.dev._

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---

Tags: [#github](https://daily.dev/tags/github), [#mcp](https://daily.dev/tags/mcp), [#vscode](https://daily.dev/tags/vscode)

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