The Vercel AI SDK frontend renders tool widgets based on tool name
(e.g. "tool-find_block", "tool-run_agent"). The SDK sends tool names
with the MCP prefix (mcp__copilot__find_block) which didn't match
any frontend switch case, causing tool execution to be invisible.
Strip the mcp__copilot__ prefix in the response adapter so tool events
reach the correct frontend widget handlers.