Claude Code defers every MCP tool behind ToolSearch by default, so a fresh session sees only the tool name until the model searches for it. The explore tool now carries `_meta: { "anthropic/alwaysLoad": true }`, which exempts it on existing installs, and the Claude Code installer target writes `alwaysLoad: true` on the server entry (re-running install adds the key to an older entry). Copilot CLI tool search holds MCP tools back the same way once ~30 tools are connected, so its entry carries `deferTools: "never"`.
The two-file reachability fixture from #1709: a `function text()` nested in
one file, a `settled.value.text()` call in another. The caller must not get
a `calls` edge onto the closure; the in-container call still resolves.
Aaron Queen
