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mco: update JSON-RPC error codes to align with updated MCP specification (#1016)

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This PR updates the error codes to align with the updated specifications
in
https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2907

ErrServerClosing and ErrClientClosing are reverted to their 1.6.0
version codes, as they do not overlap anymore with the newly introduced
error codes.
This commit is contained in:
Guglielmo Colombo 2026-06-22 10:27:31 +02:00 • committed by GitHub
commit 3486f6bcaf
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1 changed files with 18 additions and 16 deletions
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14
mcp/shared.go
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@ -355,15 +355,15 @@ func clientSessionMethod[P Params, R Result](f func(*ClientSession, context.Cont
// MCP-specific error codes.
const (
// CodeMissingRequiredClientCapabilities is the JSON-RPC error code defined by
// SEP-2575 for MissingRequiredClientCapabilitiesError.
CodeMissingRequiredClientCapabilities = -32003
// CodeUnsupportedProtocolVersion is the JSON-RPC error code defined by
// SEP-2575 for UnsupportedProtocolVersionError.
CodeUnsupportedProtocolVersion = -32004
// CodeHeaderMismatch indicates that HTTP headers do not match the corresponding values
// in the request body, or that required headers are missing or malformed.
CodeHeaderMismatch = -32001
CodeHeaderMismatch = -32020
// CodeMissingRequiredClientCapabilities is the JSON-RPC error code defined by
// SEP-2575 for MissingRequiredClientCapabilitiesError.
CodeMissingRequiredClientCapabilities = -32021
// CodeUnsupportedProtocolVersion is the JSON-RPC error code defined by
// SEP-2575 for UnsupportedProtocolVersionError.
CodeUnsupportedProtocolVersion = -32022
// CodeURLElicitationRequired indicates that the server requires URL elicitation
// before processing the request. The client should execute the elicitation handler
// with the elicitations provided in the error data.