Migrate MCP Configuration

1. Preview without modifying the file: fast-agent config migrate-mcp path/to/fast-agent.yaml.
2. Resolve any reported conflicts.
3. Apply with fast-agent config migrate-mcp path/to/fast-agent.yaml --write. The command saves the exact original as path/to/fast-agent.yaml.bak.
4. Inspect the redacted result with fast-agent config show-mcp path/to/fast-agent.yaml --view effective.

The primary shape changes from a named list:

mcp:
  targets:
    - name: docs
      target: https://example.com/mcp

to a server map:

mcp:
  servers:
    docs:
      target: https://example.com/mcp

• Moved paths: mcp.targets → mcp.servers, top-level auto_sampling → mcp.client.auto_sampling, and top-level mcp_timeline → mcp.diagnostics.timeline.
• Resolve conflicts before rerunning. The command refuses files containing both an old and new path, duplicate migrated server names, or a target combined with source fields such as transport, url, command, args, or connector_id.
• Runtime commands are now explicit: /mcp attach docs attaches the configured docs definition; /connect TARGET and /mcp connect TARGET always create an ad-hoc session definition. /mcp and /mcp status show status.
• /mcpstatus remains available temporarily and emits a deprecation warning.
• Startup --url is repeatable. Prefer one flag per URL; comma-separated input is temporary compatibility behavior.
• Current schema: Connect to MCP Servers and Configuration Reference.