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BadRequestException,
Injectable,
Logger,
NotFoundException,
OnModuleDestroy,
OnModuleInit,
} from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';
import { In, Repository } from 'typeorm';
import { McpConfig, McpTool } from '../core-entities';
import { Client } from '@modelcontextprotocol/sdk/client/index.js';
import { StdioClientTransport } from '@modelcontextprotocol/sdk/client/stdio.js';
import { LlmFunctionTool } from '../llm-provider/llm-provider.interface';
// Local interface to match the shape of a tool from the MCP SDK
// Properties are optional to match the inferred type from the SDK.
interface McpSdkTool {
name?: string;
description?: string;
inputSchema?: Record<string, any>;
}
@Injectable()
export class McpService implements OnModuleInit, OnModuleDestroy {
private readonly logger = new Logger(McpService.name);
private readonly activeClients = new Map<string, Client>();
constructor(
@InjectRepository(McpConfig)
private readonly mcpConfigRepository: Repository<McpConfig>,
@InjectRepository(McpTool)
private readonly mcpToolRepository: Repository<McpTool>,
) {}
async onModuleInit() {
this.logger.log('Initializing MCP connections...');
const configs = await this.mcpConfigRepository.find({
where: { is_active: true },
});
if (configs.length === 0) {
this.logger.warn(
'No active MCP configurations found. MCP tools will be unavailable.',
);
return;
}
for (const config of configs) {
await this.connectToServer(config);
}
}
async onModuleDestroy() {
this.logger.log('Closing all active MCP connections...');
await Promise.all(
Array.from(this.activeClients.keys()).map((serverName) =>
this.disconnectFromServer(serverName),
),
);
}
public async connectToServer(config: McpConfig) {
const { server_name, command, args, env } = config;
Iif (this.activeClients.has(server_name)) {
this.logger.log(`Already connected to ${server_name}. Skipping.`);
return;
}
this.logger.log(`Attempting to connect to MCP server: ${server_name}`);
try {
const transport = new StdioClientTransport({ command, args, env });
const client = new Client({
name: `repoburg-backend-${server_name}`,
version: '1.0.0',
});
client.connect(transport);
const toolsResult = await client.listTools();
Iif (!toolsResult || !toolsResult.tools) {
throw new Error('Invalid or empty tool list received from server.');
}
this.logger.log(
`Connected to ${server_name}. Discovered ${toolsResult.tools.length} tools.`,
);
this.activeClients.set(server_name, client);
await this.syncToolsToDb(server_name, toolsResult.tools as McpSdkTool[]);
} catch (e) {
this.logger.error(
`Failed to connect to MCP server "${server_name}": ${e.message}`,
);
}
}
public async disconnectFromServer(serverName: string) {
const client = this.activeClients.get(serverName);
Iif (client) {
try {
await client.close();
this.activeClients.delete(serverName);
this.logger.log(`Disconnected from ${serverName}`);
} catch (e) {
this.logger.error(
`Error disconnecting from ${serverName}: ${e.message}`,
);
}
}
}
private async syncToolsToDb(serverName: string, tools: McpSdkTool[]) {
this.logger.log(`Syncing tools for server: ${serverName}`);
const validTools = tools.filter(
(tool): tool is Required<Pick<McpSdkTool, 'name'>> & McpSdkTool =>
!!tool.name,
);
const existingTools = await this.mcpToolRepository.find({
where: { server_name: serverName },
});
const existingToolsMap = new Map(
existingTools.map((t) => [t.tool_name, t]),
);
const toolsToSave: McpTool[] = [];
for (const sdkTool of validTools) {
const existingTool = existingToolsMap.get(sdkTool.name);
if (existingTool) {
// Update existing tool but preserve its active state
existingTool.description = sdkTool.description || '';
existingTool.input_schema = sdkTool.inputSchema || {};
toolsToSave.push(existingTool);
} else {
// Create new tool, will default to is_active: true
toolsToSave.push(
this.mcpToolRepository.create({
server_name: serverName,
tool_name: sdkTool.name,
description: sdkTool.description || '',
input_schema: sdkTool.inputSchema || {},
}),
);
}
}
await this.mcpToolRepository.save(toolsToSave);
const newToolNames = validTools.map((t) => t.name);
const toolsToDelete = existingTools.filter(
(t) => !newToolNames.includes(t.tool_name),
);
Iif (toolsToDelete.length > 0) {
await this.mcpToolRepository.remove(toolsToDelete);
}
this.logger.log(
`Successfully synced tools for ${serverName}. Saved: ${toolsToSave.length}, Deleted: ${toolsToDelete.length}`,
);
}
public async createMcpConfig(configJson: string): Promise<McpConfig> {
let parsedConfig: any;
try {
parsedConfig = JSON.parse(configJson);
} catch (e) {
throw new BadRequestException('Invalid JSON format.');
}
const serverName = Object.keys(parsedConfig)[0];
Iif (!serverName) {
throw new BadRequestException(
'JSON must have a root key as the server name.',
);
}
const configData = parsedConfig[serverName];
Iif (!configData || !configData.command || !configData.args) {
throw new BadRequestException(
'Configuration must include "command" and "args" properties.',
);
}
const existingConfig = await this.mcpConfigRepository.findOneBy({
server_name: serverName,
});
Iif (existingConfig) {
throw new BadRequestException(
`A configuration for "${serverName}" already exists.`,
);
}
const newConfig = this.mcpConfigRepository.create({
server_name: serverName,
command: configData.command,
args: configData.args,
env: configData.env || {},
is_active: true,
});
const savedConfig = await this.mcpConfigRepository.save(newConfig);
await this.connectToServer(savedConfig);
return savedConfig;
}
public async updateMcpConfigStatus(
serverName: string,
isActive: boolean,
): Promise<McpConfig> {
const config = await this.mcpConfigRepository.findOneBy({
server_name: serverName,
});
Iif (!config) {
throw new NotFoundException(
`MCP configuration for "${serverName}" not found.`,
);
}
config.is_active = isActive;
await this.mcpConfigRepository.save(config);
if (isActive) {
await this.connectToServer(config);
} else {
await this.disconnectFromServer(serverName);
// Do not remove tools from DB, just mark them as inactive conceptually
}
return config;
}
public async deleteMcpConfig(serverName: string): Promise<void> {
const config = await this.mcpConfigRepository.findOneBy({
server_name: serverName,
});
Iif (!config) {
throw new NotFoundException(
`MCP configuration for "${serverName}" not found.`,
);
}
await this.disconnectFromServer(serverName);
await this.mcpToolRepository.delete({ server_name: serverName });
await this.mcpConfigRepository.remove(config);
}
public async batchUpdateToolStatus(
toolIds: string[],
isActive: boolean,
): Promise<{ affected: number }> {
Iif (toolIds.length === 0) {
return { affected: 0 };
}
const result = await this.mcpToolRepository.update(
{ id: In(toolIds) },
{ is_active: isActive },
);
return { affected: result.affected || 0 };
}
public async getMcpServers(): Promise<any[]> {
const configs = await this.mcpConfigRepository.find({
order: { server_name: 'ASC' },
});
const tools = await this.mcpToolRepository.find({
order: { tool_name: 'ASC' },
});
const toolsByServer = new Map<string, any[]>();
for (const tool of tools) {
Iif (!toolsByServer.has(tool.server_name)) {
toolsByServer.set(tool.server_name, []);
}
toolsByServer.get(tool.server_name).push({
id: tool.id,
tool_name: tool.tool_name,
description: tool.description,
input_schema: tool.input_schema,
is_active: tool.is_active,
});
}
return configs.map((config) => ({
server_name: config.server_name,
description: `Tools available from the ${config.server_name} server.`,
is_active: config.is_active,
tools: toolsByServer.get(config.server_name) || [],
}));
}
public async executeMcpTool(
serverName: string,
toolName: string,
args: any,
): Promise<{ stdout: string; stderr: string }> {
this.logger.log(
`Executing MCP tool: ${serverName}.${toolName} with args: ${JSON.stringify(
args,
)}`,
);
const client = this.activeClients.get(serverName);
Iif (!client) {
const errorMsg = `No active MCP connection found for server: ${serverName}`;
this.logger.error(errorMsg);
return { stdout: '', stderr: errorMsg };
}
try {
const result = await client.callTool({ name: toolName, arguments: args });
const stdout = JSON.stringify(result, null, 2);
return { stdout, stderr: '' };
} catch (e) {
this.logger.error(
`Error calling tool ${toolName} on ${serverName}: ${e.message}`,
);
return { stdout: '', stderr: e.message };
}
}
public async getMcpToolsDefinition(): Promise<string> {
const servers = await this.getMcpServers();
const activeServers = servers.filter((s) => s.is_active);
if (activeServers.length === 0) {
return 'No active MCP servers are currently connected.';
}
let definition = '';
for (const server of activeServers) {
const activeTools = server.tools.filter((t) => t.is_active);
Iif (activeTools.length === 0) continue;
definition += `### Server: ${server.server_name}\n`;
definition += `Description: ${server.description}\n`;
definition += 'Tools:\n';
for (const tool of activeTools) {
definition += `- **${tool.tool_name}**\n`;
definition += ` - Description: ${tool.description}\n`;
definition += ` - Input Schema: \`${JSON.stringify(
tool.input_schema,
)}\`\n`;
}
definition += '\n';
}
return definition;
}
/**
* Get all active MCP tool names in serverName__toolName format.
* Used by SystemPromptsService to populate the MCP tool selection UI.
*/
public async getActiveMcpToolNames(): Promise<string[]> {
const activeConfigs = await this.mcpConfigRepository.find({
where: { is_active: true },
});
if (activeConfigs.length === 0) return [];
const activeTools = await this.mcpToolRepository.find({
where: { is_active: true },
});
if (activeTools.length === 0) return [];
const activeServerNames = new Set(activeConfigs.map((c) => c.server_name));
return activeTools
.filter((t) => activeServerNames.has(t.server_name))
.map((t) => `${t.server_name}__${t.tool_name}`);
}
/**
* Generate LlmFunctionTool definitions for all active MCP tools.
* Each tool is named `{server_name}__{tool_name}` (double underscore).
* These definitions are merged with built-in tool definitions for native tool calling.
*/
public async getActiveMcpToolDefinitions(): Promise<LlmFunctionTool[]> {
const activeConfigs = await this.mcpConfigRepository.find({
where: { is_active: true },
});
if (activeConfigs.length === 0) return [];
const activeTools = await this.mcpToolRepository.find({
where: { is_active: true },
});
if (activeTools.length === 0) return [];
// Only include tools from active servers
const activeServerNames = new Set(activeConfigs.map((c) => c.server_name));
const definitions: LlmFunctionTool[] = [];
for (const tool of activeTools) {
if (!activeServerNames.has(tool.server_name)) continue;
// Use input_schema directly if it's a valid object, otherwise fallback
let parameters = tool.input_schema;
if (!parameters || typeof parameters !== 'object') {
parameters = { type: 'object', properties: {} };
}
// Ensure parameters has the required JSON Schema fields
if (!parameters.type) {
parameters = { type: 'object', ...parameters };
}
definitions.push({
type: 'function',
function: {
name: `${tool.server_name}__${tool.tool_name}`,
description:
tool.description ||
`MCP tool: ${tool.server_name}.${tool.tool_name}`,
parameters,
},
});
}
this.logger.log(
`Generated ${definitions.length} MCP tool definitions from ${activeServerNames.size} active servers.`,
);
return definitions;
}
}
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