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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"spec defines improper error codes","articleBody":"The specification sometimes defines error codes, but these codes are in the JSON-RPC2 implementation space, not the application space.\n\nFor example, in [the Resources section](https://modelcontextprotocol.io/specification/2025-03-26/server/resources#resource-templates), the \"Resource not found\" error is given the value -32002.\n[The JSON-RPC2 spec](https://www.jsonrpc.org/specification) section 5.1 says that codes from -32000 to -32099 are reserved for \"implementation-defined server-errors.\" This means JSON-RPC2 implementations, as the next sentence clarifies: \"The remainder of the space is available for application defined errors.\"\n\nSince MCP is an application, not a JSON-RPC2 implementation, it should use codes above -32000.\n","author":{"url":"https://github.com/jba","@type":"Person","name":"jba"},"datePublished":"2025-05-11T13:34:38.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/509/modelcontextprotocol/issues/509"}