MCP CLI Command Interface / Claude Code v2.0.34

What: A new command-line interface for interacting with MCP (Model Context Protocol) servers directly from bash commands within Claude Code sessions.

How to use:

# Discover available MCP servers and tools
mcp-cli servers                        # List all connected MCP servers
mcp-cli tools [server]                 # List available tools
mcp-cli grep "weather"                 # Search tools by keyword

# Get tool schema (REQUIRED before calling any tool)
mcp-cli info slack/search_private      # View JSON schema for parameters

# Invoke MCP tools
mcp-cli call slack/search_private '{"query": "mentions", "max_results": 10}'

# Use stdin for complex JSON
mcp-cli call api/send_request - <<'EOF'
{
  "endpoint": "/data",
  "headers": {"Authorization": "Bearer token"}
}
EOF

Details:

Enabled via ENABLE_EXPERIMENTAL_MCP_CLI environment variable
Claude must call mcp-cli info before any mcp-cli call to check parameter schemas
Includes full Commander.js CLI with multiple subcommands
Automatically tracked with telemetry event tengu_mcp_cli_command_executed
Evidence: Command parser Re() at line 3935, handler so2() at line 493008, entry point check at line 493024 in pretty-v2.0.34.js