echtpost-postcards

SUSPICIOUS: The skill's stated purpose matches its postcard-management capabilities, and the Membrane CLI comes from an official npm package, so this is not outright malicious. The main concern is data-flow integrity: instead of calling EchtPost directly, the skill requires a Membrane account, routes API traffic through Membrane, and relies on Membrane to store/refresh credentials server-side. That third-party intermediary is broader than a direct EchtPost integration and raises medium security risk, but the overall footprint is still plausibly related to the stated purpose.