[BUG] Experimental agent-teams mode drops Grep and Glob from the tool roster (not ToolSearch-recoverable)

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

With CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS=1, the native Grep and Glob tools are absent from the tool roster entirely — not in the active tool set, and not in the deferred-tools list either, so ToolSearch cannot recover them. This affects both the main loop and spawned subagents (even agents whose definition explicitly declares Grep/Glob in their tool list).

Bash becomes the only available search primitive. With no reliable, purpose-built search tool, the model degrades to reading whole files to locate content — a large, avoidable token cost, and exactly the failure dedicated search tools exist to prevent. It also silently breaks per-agent tool scoping: a custom subagent declaring Grep/Glob never actually receives them.

What Should Happen?

Grep and Glob should be available. Or — consistent with how this build defers other core tools (WebFetch, WebSearch, NotebookEdit appear in the deferred-tools list and are recoverable via ToolSearch) — they should at minimum be deferred and ToolSearch-recoverable. A custom subagent's declared Grep/Glob tools should also materialize rather than being stripped globally.

Error Messages/Logs

# ToolSearch with an exact-name selector for the two tools:
ToolSearch  query="select:Grep,Glob"
=> No matching deferred tools found

Steps to Reproduce

1. Launch Claude Code with CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS=1 (e.g. set in settings.json under env).
2. Inspect the active tool roster — neither Grep nor Glob is present; the only search/read primitives are Bash and Read.
3. Run ToolSearch with select:Grep,Glob → No matching deferred tools found (they are not even deferred).
4. Spawn a subagent whose definition declares Tools: Glob, Grep, Read, Bash, ... and ask it to use Grep/Glob → it reports neither is available, confirming the strip is global, not per-agent.
5. Relaunch with the flag unset → Grep/Glob return. This isolates the cause to the experimental agent-teams mode.

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

Claude Code Version

2.1.186 (Claude Code) — next/latest dist-tag

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other (cmux — a Ghostty-based terminal)

Additional Information

• There is no disallowedTools/disabledTools entry in any settings file, and claude resolves to the unwrapped native binary (no launch-flag wrapper) — so the missing tools are attributable to the experimental flag, not local config.
• Reproduced both in the top-level session and via a spawned subagent.
• Suggested fix: include Grep/Glob in the deferred-tools set under agent-teams mode (same treatment as WebFetch/WebSearch) so ToolSearch can surface them; ideally keep them in the active roster since search is a hot path; and honor a custom subagent's declared tools instead of dropping them globally.