Built-in `Grep`/`Glob` tools unavailable when `ENABLE_TOOL_SEARCH=1` (not in active set, not discoverable via ToolSearch)

What happened

With ENABLE_TOOL_SEARCH: "1" set in .claude/settings.json env, the built-in Grep and Glob tools are:

1. NOT present in the active tool list, and
2. NOT discoverable via the deferred ToolSearch tool — ToolSearch with query select:Grep,Glob returns No matching deferred tools found.

As a result they are completely inaccessible. The agent repeatedly mis-diagnoses this as "ripgrep is not installed" and falls back to Bash grep, even though ripgrep is installed and working.

Expected

Built-in tools (Grep, Glob, Read, Write, Edit, Bash) should never be deferred/hidden by Tool Search. They should either always be in the active set, or at minimum be discoverable via ToolSearch. There is currently no documented way to pin built-in tools when Tool Search is on (alwaysLoad only applies to MCP servers).

Environment

• Claude Code: 2.1.156
• Platform: macOS (darwin 25.4.0)
• ripgrep: 15.1.0 at /opt/homebrew/bin/rg (installed & working)
• .claude/settings.json env: "ENABLE_TOOL_SEARCH": "1" (project has 200+ MCP tools)

Repro

1. Set "ENABLE_TOOL_SEARCH": "1" in project .claude/settings.json env.
2. Start a session.
3. Observe Grep/Glob are absent from the active tools and not returned by ToolSearch select:Grep,Glob.