Document VS Code agent-sandbox filesystem restrictions - #70
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The sandbox (chat.agent.sandbox.enabled) blocks read/write outside the workspace, causing Step 0 to fail (MODULE_NOT_FOUND on the check script, EROFS on npm cache, unreadable ~/.jfrog) in ways that look like Agent Guard being disabled. Document the env-var credential workaround and VS Code's sandbox-bypass confirmation as the fix.
Condense to the essential facts and workaround.
"Run once outside sandbox" is Copilot App's wording (a different product), quoted in a still-open VS Code feature request (#333900) asking VS Code to adopt it — not current VS Code UI text. VS Code today shows only its generic tool-confirmation prompt. Verified chat.agent.sandbox.enabled itself directly against VS Code source (src/vs/platform/sandbox/common/settings.ts).
- Env vars fix the ~/.jfrog/ credential path only; MODULE_NOT_FOUND
(sandbox blocks reading the check script itself) needs the bypass/
disable route instead. Split into two bullets.
- Name the actual confirmation mechanism (sandboxBypass: true / "Run
in terminal outside the sandbox?"), verified against
runInTerminalConfirmationTool.ts in microsoft/vscode.
- Note that MCP server env (${input:...}) is resolved by VS Code
itself and unaffected by this sandbox.
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Summary
chat.agent.sandbox.enabled) blocks filesystem access outside the workspace, which surfaces as Step 0 failures (MODULE_NOT_FOUND, unreadable~/.jfrog/,EROFSon npm cache) that look like Agent Guard being disabled but aren't.## VS Code's sandboxsection toharness-vscode.md(mirrors the existing## Codex's sandboxsection) documenting the cause and the env-var credential workaround.Test plan