Developer shares practical tips for publishing a Claude plugin to Anthropic marketplace

A developer documenting their experience building a Claude plugin found that publishing to the Anthropic marketplace was significantly more demanding than local development. Key pitfalls included a strict manifest schema where fields like required_python_version and runtime_dependencies must be fully populated, and a naming convention requiring a callable named 'main' at the plugin entry point. Dependency mismatches between sandbox and marketplace container environments caused runtime errors even after a plugin was accepted, highlighting the need to pin all dependencies to tested versions using pip freeze. Running the marketplace's own validation script locally before each submission helped reduce lengthy debugging cycles. The developer also used a tool called LoreConvo to track notes, decisions, and dependencies throughout the review and publishing process.