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Merge pull request #495 from koic/subscriptions_listen

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Serve the `subscriptions/listen` notification stream per SEP-2575
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Koichi ITO 2026-08-13 23:05:35 +09:00 • committed by GitHub
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1 changed files with 719 additions and 4 deletions
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27
test/mcp/server_test.rb
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@ -130,7 +130,9 @@ module MCP
result = response[:result]
assert_equal Configuration::SUPPORTED_MODERN_PROTOCOL_VERSIONS, result[:supportedVersions]
assert_equal @server.capabilities, result[:capabilities]
# Without a `subscriptions/listen`-serving transport, the `listChanged` flags are
# stripped from the advertised capabilities (see the dedicated tests below).
assert_equal @server.capabilities.keys, result[:capabilities].keys
# Per the finalized spec (PR #3002), the server identity is the optional `_meta` stamp,
# not a top-level `serverInfo` field.
assert_equal @server_name, result.dig(:_meta, RequestEnvelope::SERVER_INFO_META_KEY, :name)
@ -139,6 +141,29 @@ module MCP
assert_equal "Optional instructions for the client", result[:instructions]
end
test "#handle server/discover strips listChanged and subscribe flags without a listen-serving transport" do
server = Server.new(name: "discover_test", capabilities: {
tools: { listChanged: true },
resources: { listChanged: true, subscribe: true },
logging: {},
})
result = server.handle({ jsonrpc: "2.0", method: "server/discover", id: 1 })[:result]
assert_equal({ tools: {}, resources: {}, logging: {} }, result[:capabilities])
end
test "#handle server/discover keeps listChanged flags when the transport serves subscriptions/listen" do
server = Server.new(name: "discover_test", capabilities: { tools: { listChanged: true } })
transport = mock
transport.stubs(:serves_subscriptions_listen?).returns(true)
server.transport = transport
result = server.handle({ jsonrpc: "2.0", method: "server/discover", id: 1 })[:result]
assert_equal({ tools: { listChanged: true } }, result[:capabilities])
end
test "#handle server/discover responds before initialize and regardless of capabilities" do
# Per SEP-2575, discovery is sessionless: no prior `initialize`, no capability gate.
server = Server.new(name: "discover_test", capabilities: {})