X_MCP_RESOURCE_DUPLICATE
Means
two resources claim one MCP resource URI
Typical cause
an app resource registered at a ultimate:// URI the framework already publishes, or one registerAll batch listing a URI twice. Resources used to Map.set-overwrite while tools threw, so resources/read answered from whichever provider was wired last
Fix
give one its own URI — register({ uri: 'ultimate://manifest-<what-it-is>', … }) — or drop the duplicate registration