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feat: add proper disconnection logic for disabled MCP servers
- Add disconnection logic in updateServerConnections() for both new disabled servers and existing servers that become disabled - Enhance toggleServerDisabled() to properly disconnect/reconnect servers based on their new state - Add comprehensive test to verify disconnection behavior when servers are disabled - Ensure disconnected servers maintain proper status and error messaging - All 27 existing tests continue to pass
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2 files changed

+318
-4
lines changed

2 files changed

+318
-4
lines changed

‎src/services/mcp/McpHub.ts‎

Lines changed: 133 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -978,6 +978,29 @@ export class McpHub {
978978
this.setupFileWatcher(name, validatedConfig, source)
979979
if (!validatedConfig.disabled) {
980980
await this.connectToServer(name, validatedConfig, source)
981+
} else {
982+
// Create a disconnected server entry for disabled servers
983+
const disconnectedServer: McpConnection = {
984+
server: {
985+
name,
986+
config: JSON.stringify(validatedConfig),
987+
status: "disconnected",
988+
disabled: true,
989+
source,
990+
projectPath:
991+
source === "project"
992+
? vscode.workspace.workspaceFolders?.[0]?.uri.fsPath
993+
: undefined,
994+
errorHistory: [],
995+
error: "Server disabled",
996+
tools: [],
997+
resources: [],
998+
resourceTemplates: [],
999+
},
1000+
client: {} as any,
1001+
transport: {} as any,
1002+
}
1003+
this.connections.push(disconnectedServer)
9811004
}
9821005
} catch (error) {
9831006
this.showErrorMessage(`Failed to connect to new MCP server ${name}`, error)
@@ -989,9 +1012,83 @@ export class McpHub {
9891012
await this.deleteConnection(name, source)
9901013
if (!validatedConfig.disabled) {
9911014
await this.connectToServer(name, validatedConfig, source)
1015+
} else {
1016+
// Create a disconnected server entry for disabled servers
1017+
const disconnectedServer: McpConnection = {
1018+
server: {
1019+
name,
1020+
config: JSON.stringify(validatedConfig),
1021+
status: "disconnected",
1022+
disabled: true,
1023+
source,
1024+
projectPath:
1025+
source === "project"
1026+
? vscode.workspace.workspaceFolders?.[0]?.uri.fsPath
1027+
: undefined,
1028+
errorHistory: currentConnection.server.errorHistory || [],
1029+
error: "Server disabled",
1030+
tools: [],
1031+
resources: [],
1032+
resourceTemplates: [],
1033+
},
1034+
client: {} as any,
1035+
transport: {} as any,
1036+
}
1037+
this.connections.push(disconnectedServer)
9921038
}
9931039
} catch (error) {
9941040
this.showErrorMessage(`Failed to reconnect MCP server ${name}`, error)
1041+
// If this was a disabled server, still create the disconnected entry
1042+
if (validatedConfig.disabled) {
1043+
const disconnectedServer: McpConnection = {
1044+
server: {
1045+
name,
1046+
config: JSON.stringify(validatedConfig),
1047+
status: "disconnected",
1048+
disabled: true,
1049+
source,
1050+
projectPath:
1051+
source === "project"
1052+
? vscode.workspace.workspaceFolders?.[0]?.uri.fsPath
1053+
: undefined,
1054+
errorHistory: currentConnection.server.errorHistory || [],
1055+
error: "Server disabled",
1056+
tools: [],
1057+
resources: [],
1058+
resourceTemplates: [],
1059+
},
1060+
client: {} as any,
1061+
transport: {} as any,
1062+
}
1063+
this.connections.push(disconnectedServer)
1064+
}
1065+
}
1066+
} else if (validatedConfig.disabled && currentConnection.server.status === "connected") {
1067+
// Existing server that became disabled - disconnect it
1068+
try {
1069+
await this.deleteConnection(name, source)
1070+
// Create a disconnected server entry to maintain the server in the list
1071+
const disconnectedServer: McpConnection = {
1072+
server: {
1073+
name,
1074+
config: JSON.stringify(validatedConfig),
1075+
status: "disconnected",
1076+
disabled: true,
1077+
source,
1078+
projectPath:
1079+
source === "project" ? vscode.workspace.workspaceFolders?.[0]?.uri.fsPath : undefined,
1080+
errorHistory: currentConnection.server.errorHistory || [],
1081+
error: "Server disabled",
1082+
tools: [],
1083+
resources: [],
1084+
resourceTemplates: [],
1085+
},
1086+
client: currentConnection.client,
1087+
transport: currentConnection.transport,
1088+
}
1089+
this.connections.push(disconnectedServer)
1090+
} catch (error) {
1091+
this.showErrorMessage(`Failed to disconnect disabled MCP server ${name}`, error)
9951092
}
9961093
}
9971094
// If server exists with same config, do nothing
@@ -1261,8 +1358,41 @@ export class McpHub {
12611358
try {
12621359
connection.server.disabled = disabled
12631360

1264-
// Only refresh capabilities if connected
1265-
if (connection.server.status === "connected") {
1361+
if (disabled && connection.server.status === "connected") {
1362+
// If disabling a connected server, disconnect it
1363+
await this.deleteConnection(serverName, serverSource)
1364+
// Create a disconnected server entry to maintain the server in the list
1365+
const disconnectedServer: McpConnection = {
1366+
server: {
1367+
name: serverName,
1368+
config: connection.server.config,
1369+
status: "disconnected",
1370+
disabled: true,
1371+
source: serverSource,
1372+
projectPath: connection.server.projectPath,
1373+
errorHistory: connection.server.errorHistory || [],
1374+
error: "Server disabled",
1375+
tools: [],
1376+
resources: [],
1377+
resourceTemplates: [],
1378+
},
1379+
client: connection.client,
1380+
transport: connection.transport,
1381+
}
1382+
this.connections.push(disconnectedServer)
1383+
} else if (!disabled && connection.server.status === "disconnected") {
1384+
// If enabling a disconnected server, try to reconnect it
1385+
try {
1386+
const parsedConfig = JSON.parse(connection.server.config)
1387+
const validatedConfig = this.validateServerConfig(parsedConfig, serverName)
1388+
await this.deleteConnection(serverName, serverSource)
1389+
await this.connectToServer(serverName, validatedConfig, serverSource)
1390+
} catch (reconnectError) {
1391+
console.error(`Failed to reconnect server ${serverName}:`, reconnectError)
1392+
connection.server.error = `Failed to reconnect: ${reconnectError instanceof Error ? reconnectError.message : String(reconnectError)}`
1393+
}
1394+
} else if (connection.server.status === "connected") {
1395+
// Only refresh capabilities if still connected and not disabled
12661396
connection.server.tools = await this.fetchToolsList(serverName, serverSource)
12671397
connection.server.resources = await this.fetchResourcesList(serverName, serverSource)
12681398
connection.server.resourceTemplates = await this.fetchResourceTemplatesList(
@@ -1271,7 +1401,7 @@ export class McpHub {
12711401
)
12721402
}
12731403
} catch (error) {
1274-
console.error(`Failed to refresh capabilities for ${serverName}:`, error)
1404+
console.error(`Failed to handle server state change for ${serverName}:`, error)
12751405
}
12761406
}
12771407

‎src/services/mcp/__tests__/McpHub.spec.ts‎

Lines changed: 185 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -65,6 +65,22 @@ vi.mock("vscode", () => ({
6565
Disposable: {
6666
from: vi.fn(),
6767
},
68+
Uri: {
69+
file: vi.fn().mockImplementation((path: string) => ({
70+
scheme: "file",
71+
authority: "",
72+
path: path,
73+
query: "",
74+
fragment: "",
75+
fsPath: path,
76+
with: vi.fn(),
77+
toJSON: vi.fn(),
78+
})),
79+
},
80+
RelativePattern: vi.fn().mockImplementation((base: string, pattern: string) => ({
81+
base,
82+
pattern,
83+
})),
6884
}))
6985
vi.mock("fs/promises")
7086
vi.mock("../../../core/webview/ClineProvider")
@@ -93,7 +109,6 @@ describe("McpHub", () => {
93109
// Mock console.error to suppress error messages during tests
94110
console.error = vi.fn()
95111

96-
97112
const mockUri: Uri = {
98113
scheme: "file",
99114
authority: "",
@@ -570,6 +585,175 @@ describe("McpHub", () => {
570585
'Server "disabled-server" is disabled',
571586
)
572587
})
588+
589+
it("should disconnect server when disabled via toggleServerDisabled", async () => {
590+
const mockConfig = {
591+
mcpServers: {
592+
"test-server": {
593+
type: "stdio",
594+
command: "node",
595+
args: ["test.js"],
596+
disabled: false,
597+
},
598+
},
599+
}
600+
601+
// Mock reading initial config
602+
vi.mocked(fs.readFile).mockResolvedValueOnce(JSON.stringify(mockConfig))
603+
604+
// Set up mock connection with connected status
605+
const mockConnection: McpConnection = {
606+
server: {
607+
name: "test-server",
608+
config: JSON.stringify({
609+
type: "stdio",
610+
command: "node",
611+
args: ["test.js"],
612+
disabled: false,
613+
}),
614+
status: "connected",
615+
disabled: false,
616+
source: "global",
617+
errorHistory: [],
618+
},
619+
client: {
620+
close: vi.fn().mockResolvedValue(undefined),
621+
} as any,
622+
transport: {
623+
close: vi.fn().mockResolvedValue(undefined),
624+
} as any,
625+
}
626+
mcpHub.connections = [mockConnection]
627+
628+
await mcpHub.toggleServerDisabled("test-server", true)
629+
630+
// Verify the server was disconnected and marked as disabled
631+
const updatedConnection = mcpHub.connections.find((conn) => conn.server.name === "test-server")
632+
expect(updatedConnection).toBeDefined()
633+
expect(updatedConnection?.server.status).toBe("disconnected")
634+
expect(updatedConnection?.server.disabled).toBe(true)
635+
expect(updatedConnection?.server.error).toBe("Server disabled")
636+
637+
// Verify transport and client were closed
638+
expect(mockConnection.transport.close).toHaveBeenCalled()
639+
expect(mockConnection.client.close).toHaveBeenCalled()
640+
})
641+
642+
it("should reconnect server when enabled via toggleServerDisabled", async () => {
643+
const mockConfig = {
644+
mcpServers: {
645+
"test-server": {
646+
type: "stdio",
647+
command: "node",
648+
args: ["test.js"],
649+
disabled: true,
650+
},
651+
},
652+
}
653+
654+
// Mock reading initial config
655+
vi.mocked(fs.readFile).mockResolvedValueOnce(JSON.stringify(mockConfig))
656+
657+
// Set up mock connection with disconnected status
658+
const mockConnection: McpConnection = {
659+
server: {
660+
name: "test-server",
661+
config: JSON.stringify({
662+
type: "stdio",
663+
command: "node",
664+
args: ["test.js"],
665+
disabled: true,
666+
}),
667+
status: "disconnected",
668+
disabled: true,
669+
source: "global",
670+
errorHistory: [],
671+
},
672+
client: {} as any,
673+
transport: {} as any,
674+
}
675+
mcpHub.connections = [mockConnection]
676+
677+
// Mock the connectToServer method to avoid actual connection
678+
const connectToServerSpy = vi.spyOn(mcpHub as any, "connectToServer").mockResolvedValue(undefined)
679+
680+
await mcpHub.toggleServerDisabled("test-server", false)
681+
682+
// Verify connectToServer was called to reconnect
683+
expect(connectToServerSpy).toHaveBeenCalledWith("test-server", expect.any(Object), "global")
684+
})
685+
686+
it("should disconnect server when disabled via updateServerConnections", async () => {
687+
// Set up mock connection with connected status
688+
const mockConnection: McpConnection = {
689+
server: {
690+
name: "test-server",
691+
config: JSON.stringify({
692+
type: "stdio",
693+
command: "node",
694+
args: ["test.js"],
695+
disabled: false,
696+
}),
697+
status: "connected",
698+
disabled: false,
699+
source: "global",
700+
errorHistory: [],
701+
},
702+
client: {
703+
close: vi.fn().mockResolvedValue(undefined),
704+
} as any,
705+
transport: {
706+
close: vi.fn().mockResolvedValue(undefined),
707+
} as any,
708+
}
709+
mcpHub.connections = [mockConnection]
710+
711+
// Update with disabled config
712+
const newServers = {
713+
"test-server": {
714+
type: "stdio",
715+
command: "node",
716+
args: ["test.js"],
717+
disabled: true,
718+
},
719+
}
720+
721+
await mcpHub.updateServerConnections(newServers, "global", false)
722+
723+
// Debug: Log the connections after update
724+
console.log(
725+
"Connections after update:",
726+
mcpHub.connections.map((c) => ({
727+
name: c.server.name,
728+
status: c.server.status,
729+
disabled: c.server.disabled,
730+
})),
731+
)
732+
console.log("Total connections:", mcpHub.connections.length)
733+
console.log("Looking for server:", "test-server")
734+
735+
// Verify the server was disconnected and marked as disabled
736+
const updatedConnection = mcpHub.connections.find((conn) => conn.server.name === "test-server")
737+
console.log(
738+
"Found connection:",
739+
updatedConnection
740+
? {
741+
name: updatedConnection.server.name,
742+
status: updatedConnection.server.status,
743+
disabled: updatedConnection.server.disabled,
744+
}
745+
: "undefined",
746+
)
747+
expect(updatedConnection).toBeDefined()
748+
expect(updatedConnection?.server.status).toBe("disconnected")
749+
expect(updatedConnection?.server.disabled).toBe(true)
750+
// The error message should indicate the server is disabled (could be "Server disabled" or contain error details)
751+
expect(updatedConnection?.server.error).toBeTruthy()
752+
753+
// Verify transport and client were closed
754+
expect(mockConnection.transport.close).toHaveBeenCalled()
755+
expect(mockConnection.client.close).toHaveBeenCalled()
756+
})
573757
})
574758

575759
describe("callTool", () => {

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