[Bug] - ToolSearch select: syntax fails to match MCP tools by short name

Bug

ToolSearch with select: syntax fails to find MCP tools when using short names. Only full prefixed names work.

Repro

# Fails — returns empty results
ToolSearch(query='select:get_handoff,get_orientation,query_conventions')

# Works — full MCP names
ToolSearch(query='select:mcp__agent-tools__get_handoff,mcp__agent-tools__get_orientation,mcp__agent-tools__query_conventions')

# Works — keyword fallback
ToolSearch(query='handoff orientation conventions')

Expected

select:get_handoff should match mcp__agent-tools__get_handoff via suffix matching, similar to how keyword search finds tools by partial name.

Impact

Adds ~5-10s latency per session when agents (or agent prompts) use select: with short names — the first call fails silently, then a keyword fallback is needed. This affects every onboarding/bootstrap sequence that loads deferred MCP tools.

Environment

• Claude Code CLI (latest)
• MCP server with agent-tools namespace
• Observed across multiple sessions on different machines