diff options
Diffstat (limited to 'internal/mcp/server.go')
| -rw-r--r-- | internal/mcp/server.go | 25 |
1 files changed, 18 insertions, 7 deletions
diff --git a/internal/mcp/server.go b/internal/mcp/server.go index 4bc66dd..6ac7537 100644 --- a/internal/mcp/server.go +++ b/internal/mcp/server.go @@ -107,13 +107,13 @@ func (s *Server) handleInitialize(req Request) { s.logger.Printf("initialize from client: %s %s (protocol: %s)", params.ClientInfo.Name, params.ClientInfo.Version, params.ProtocolVersion) - // Validate protocol version (accept both old and new versions for compatibility) - if params.ProtocolVersion != "2024-11-05" && params.ProtocolVersion != "2025-06-18" { - s.logger.Printf("warning: unsupported protocol version: %s", params.ProtocolVersion) - } + // Negotiate protocol version: echo client's version if valid, otherwise use latest. + // This follows the MCP spec where the server responds with a version it supports. + negotiatedVersion := negotiateProtocolVersion(params.ProtocolVersion) + s.logger.Printf("negotiated protocol version: %s", negotiatedVersion) result := InitializeResult{ - ProtocolVersion: "2025-06-18", + ProtocolVersion: negotiatedVersion, Capabilities: ServerCapabilities{ Prompts: &PromptsCapability{ ListChanged: false, @@ -133,6 +133,17 @@ func (s *Server) handleInitialize(req Request) { s.sendResponse(req.ID, result) } +// negotiateProtocolVersion returns the client's version if supported, +// otherwise returns the latest version this server supports. +func negotiateProtocolVersion(clientVersion string) string { + for _, v := range ValidProtocolVersions { + if v == clientVersion { + return clientVersion + } + } + return LatestProtocolVersion +} + // handleInitialized processes the initialized notification. // This is sent by the client after receiving initialize response. func (s *Server) handleInitialized(_ Request) { @@ -166,8 +177,8 @@ func (s *Server) handlePromptsList(req Request) { return } - // Convert to PromptInfo - var infos []PromptInfo + // Convert to PromptInfo (initialize as empty slice so JSON marshals as [] not null) + infos := make([]PromptInfo, 0, len(prompts)) for _, p := range prompts { args := make([]PromptArgument, len(p.Arguments)) for i, a := range p.Arguments { |