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PR #3200 introduced per-agent `skills_local=ignore` isolation that mirrors the host's Claude config dir into a per-task scratch dir, omitting `skills/` to keep broken local skills out of the CLI's discovery path. The mirror walks entries inside `hostConfigDir` (default: `$HOME/.claude/`), but Claude Code's default layout stores its main config — login state, project history — at `$HOME/.claude.json`, a *sibling* of `~/.claude/` rather than inside it. Once `CLAUDE_CONFIG_DIR=$ISOLATED` is set, the CLI looks for `$ISOLATED/.claude.json`, finds only `backups/.claude.json.backup.*` (those live inside `~/.claude/` and DO get mirrored), and exits with: Claude configuration file not found at: …/.claude.json Not logged in · Please run /login — so every agent with `skills_local=ignore` on a host using the default Claude layout dies on the first turn. Flipping the toggle back to "merge" restores the host CLAUDE_CONFIG_DIR and recovers the agent; that's the workaround Bohan flagged in MUL-2661. Fix: after the existing `mirrorHostClaudeExceptSkills`, run a new `mirrorHostClaudeJSONIfMissing` that pulls `$HOME/.claude.json` into the scratch dir as `.claude.json` when (a) the dest doesn't already have one and (b) the host source dir is the default `$HOME/.claude/`. The custom-CLAUDE_CONFIG_DIR path is left alone because a pinned custom dir is expected to be self-contained — silently borrowing `$HOME/.claude.json` from a different account would mask credential drift. The helper goes through `createFileLink`, so it inherits the same symlink → junction → hardlink → copy fallback chain the rest of the mirror uses on Windows-without-Developer-Mode hosts. Tests: - `TestMirrorHostClaudeJSONIfMissing_DefaultLayoutMirrorsParentFile` covers the happy path with an injected `homeDir`/`fileLink`. - `TestMirrorHostClaudeJSONIfMissing_AlreadyPresentNoop` asserts a pre-existing dest `.claude.json` (from a custom CLAUDE_CONFIG_DIR mirror) is not overwritten. - `TestMirrorHostClaudeJSONIfMissing_CustomHostDirSkipped` locks in the custom-host-dir gate. - `TestMirrorHostClaudeJSONIfMissing_MissingSourceNoop` documents the env-var-auth-only / fresh-install case. - `TestClaudeExecuteIsolatesProvidesClaudeJSONFromHome` is the end-to-end MUL-2661 regression: a fake `\$HOME` with the default split layout, `skills_local=ignore`, fake claude binary that prints whatever `.claude.json` reaches the scratch dir. Asserts the file rides through. Verified the test fails (with the documented MUL-2661 error message) when the new mirror call is removed. Verification: - `go test ./pkg/agent/...` green (full agent suite). - `GOOS=windows GOARCH=amd64 go vet ./pkg/agent/...` clean. Co-authored-by: multica-agent <github@multica.ai>