Custom headers for the SigV4 MCP server.
IAM role ARN to assume for SigV4 signing. Optional — when omitted, credentials are resolved at runtime via a monitor account association.
AWS region for SigV4 signing. Use '*' for SigV4a multi-region signing.
Deprecated — use mcpRoleArn instead. IAM role ARN to assume for SigV4 signing.
AWS service name for SigV4 signing.