manifest.json is the technical backbone of the DXT extension , using JSON structured format to define three key dimensions : the basic metadata ( including dxt_version, name and other version identification ) , server configuration ( specify the type of runtime , entry file and startup parameters ) and user-configurable items ( such as API keys , directory permissions , etc. ) . The file supports environment variable substitutions such as ${HOME}, allows developers to declare constraints such as required/multiple, and allows users to complete complex configurations through a GUI interface. dxt validate command provided by Anthropic automatically verifies the compliance of incoming configurations.
This answer comes from the articleDesktop Extensions (DXT): Packaging tool to simplify local MCP server installationThe
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