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import { SquadService } from '../core/mcp';
import { SquadConfigService } from '../core/config';
import * as readline from 'readline';
interface IMcpRequest {
method: string;
params?: Record<string, unknown>;
id?: string | number;
}
interface IMcpResponse {
jsonrpc: '2.0';
result?: unknown;
error?: {
code: number;
message: string;
};
id?: string | number;
}
@Command({
name: 'mcp',
description: 'Squad MCP stdio server'
})
export class McpCliCommand extends CommandRunner {
constructor(
private readonly squadService: SquadService,
private readonly configService: SquadConfigService
) {
super();
}
// Accept CLI options (nest-commander)
// Config also parses process.argv (options are optional).
@Option({
flags: '--engine <engine>',
description: 'Engine to use: cursor-agent | claude | codex'
})
parseEngine(value: string): string {
return value;
}
@Option({
flags: '--execution-mode <mode>',
description:
'Execution mode when using a custom template: ' +
'sequential | parallel'
})
parseExecutionMode(value: string): string {
return value;
}
@Option({
flags: '--sequential',
description:
'Shorthand to force sequential execution ' +
'when using a custom template'
})
parseSequential(): boolean {
return true;
}
@Option({
flags: '--state-mode <mode>',
description: 'State mode: stateless | stateful'
})
parseStateMode(value: string): string {
return value;
}
async run(
_passedParams?: string[],
_options?: Record<string, unknown>
): Promise<void> {
// Use stderr for readline output to
// avoid interfering with JSON-RPC on stdout
const rl = readline.createInterface({
input: process.stdin,
output: process.stderr,
terminal: false
});
rl.on('line', async (line: string) => {
try {
const request: IMcpRequest = JSON.parse(line);
const response = await this.handleRequest(request);
// Only send response if it has an id (not a notification)
if (response.id !== undefined) {
this.sendResponse(response);
}
} catch (error) {
const errorResponse: IMcpResponse = {
jsonrpc: '2.0',
error: {
code: -32700,
message:
error instanceof Error ? error.message : 'Parse error'
},
id: undefined // Parse errors should include id if request had one
};
// Try to extract id from the original request if possible
try {
const request: IMcpRequest = JSON.parse(line);
Eif (request.id !== undefined) {
errorResponse.id = request.id;
this.sendResponse(errorResponse);
}
} catch {
// If we can't parse, don't send response
}
}
});
rl.on('close', () => {
process.exit(0);
});
// Keep process alive
await new Promise(() => {});
}
private async handleRequest(
request: IMcpRequest
): Promise<IMcpResponse> {
const { method, params = {}, id } = request;
try {
let result: unknown;
switch (method) {
case 'initialize':
// MCP protocol initialization
result = {
protocolVersion: '2024-11-05',
capabilities: {
tools: {}
},
serverInfo: {
name: 'gs-squad-mcp',
version: '1.0.2'
}
};
break;
case 'tools/list':
// Return available MCP tools
result = {
tools: [
{
name: 'list_roles',
description: 'List all available role definitions',
inputSchema: {
type: 'object',
properties: {},
required: []
}
},
{
name: 'start_squad_members',
description: 'Spawn one or more role-specialized agents',
inputSchema: {
type: 'object',
properties: {
orchestratorChatId: { type: 'string' },
workspaceId: { type: 'string' },
members: {
type: 'array',
items: {
type: 'object',
properties: {
roleId: { type: 'string' },
task: { type: 'string' },
cwd: { type: 'string' },
chatId: { type: 'string' }
},
required: [ 'roleId', 'task' ]
}
}
},
required: [ 'members' ]
}
}
]
};
break;
case 'tools/call': {
// MCP protocol tool invocation
const toolName = (params as { name?: string }).name;
const toolArguments =
(params as { arguments?: Record<string, unknown> })
.arguments || {};
switch (toolName) {
case 'list_roles':
result = {
content: [
{
type: 'text',
text: JSON.stringify(await this.squadService.listRoles())
}
]
};
break;
case 'start_squad_members': {
const config = this.configService.getConfig();
let toolResult: unknown;
if (config.stateMode === 'stateless') {
toolResult = await this.squadService.startSquadMembersStateless(
toolArguments as unknown as Parameters<
typeof this.squadService.startSquadMembersStateless
>[0]
);
} else {
toolResult = await this.squadService.startSquadMembersStateful(
toolArguments as unknown as Parameters<
typeof this.squadService.startSquadMembersStateful
>[0]
);
}
result = {
content: [
{
type: 'text',
text: JSON.stringify(toolResult)
}
]
};
break;
}
default:
return {
jsonrpc: '2.0',
error: {
code: -32601,
message: `Tool not found: ${toolName}`
},
id
};
}
break;
}
case 'list_roles':
result = await this.squadService.listRoles();
break;
case 'start_squad_members': {
const config = this.configService.getConfig();
if (config.stateMode === 'stateless') {
result = await this.squadService.startSquadMembersStateless(
params as unknown as Parameters<
typeof this.squadService.startSquadMembersStateless
>[0]
);
} else {
result = await this.squadService.startSquadMembersStateful(
params as unknown as Parameters<
typeof this.squadService.startSquadMembersStateful
>[0]
);
}
break;
}
default:
return {
jsonrpc: '2.0',
error: {
code: -32601,
message: `Method not found: ${method}`
},
id
};
}
return { jsonrpc: '2.0', result, id };
} catch (error) {
return {
jsonrpc: '2.0',
error: {
code: -32603,
message:
error instanceof Error ? error.message : 'Internal error'
},
id
};
}
}
private sendResponse(response: IMcpResponse): void {
const json = JSON.stringify(response);
process.stdout.write(json + '\n');
}
}
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