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Fix protocol issue during startup #6

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Fix protocol issue during startup #6

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Fix protocol issue 
Claude Code does not always send the `listChanged` field during the
handshake. This can prevent a server built with this library to fail
during startup.
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@kapunga
kapunga committed Sep 6, 2025
commit 468854481fd419a816e5692a999008a5d8e3e625
2 changes: 1 addition & 1 deletion mcp/protocol/src/main/scala/ch/linkyard/mcp/protocol/lifecycle.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -143,7 +143,7 @@ object Initialize:
}

given Decoder[Changable] = Decoder.instance { c =>
c.downField("listChanged").as[Boolean].map(Changable.apply)
c.downField("listChanged").as[Option[Boolean]].map(_.getOrElse(false)).map(Changable.apply)
}

case class Subscribable(subscribe: Boolean, listChanged: Boolean)
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