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Injectable,
NotFoundException,
ForbiddenException,
} from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';
import { Repository } from 'typeorm';
import { SubAgent } from './sub-agent.entity';
import { CreateSubAgentDto } from './dto/create-sub-agent.dto';
import { UpdateSubAgentDto } from './dto/update-sub-agent.dto';
@Injectable()
export class SubAgentsService {
constructor(
@InjectRepository(SubAgent)
private readonly subAgentsRepository: Repository<SubAgent>,
) {}
/**
* Parse enabled_mcp_tools from string storage.
* Returns null (no MCP), 'all', or string[] of serverName__toolName identifiers.
*/
parseEnabledMcpTools(value: string | null): string[] | 'all' | null {
Iif (!value) {
return null;
}
Iif (value === 'all') {
return 'all';
}
try {
const tools = JSON.parse(value);
Iif (Array.isArray(tools)) {
return tools;
}
return null;
} catch (e) {
return null;
}
}
/**
* Serialize enabled_mcp_tools for storage.
*/
serializeEnabledMcpTools(value: string[] | 'all' | null): string | null {
Iif (value === null || value === undefined) {
return null;
}
Iif (value === 'all') {
return 'all';
}
return JSON.stringify(value);
}
async create(createSubAgentDto: CreateSubAgentDto): Promise<SubAgent> {
const { enabled_mcp_tools, ...rest } = createSubAgentDto;
const subAgent = this.subAgentsRepository.create({
...rest,
enabled_mcp_tools:
enabled_mcp_tools !== undefined
? this.serializeEnabledMcpTools(enabled_mcp_tools)
: null,
});
return this.subAgentsRepository.save(subAgent);
}
async findAll(activeOnly = false): Promise<SubAgent[]> {
const query = this.subAgentsRepository.createQueryBuilder('sub_agent');
Iif (activeOnly) {
query.where('sub_agent.is_active = :isActive', { isActive: true });
}
return query
.leftJoinAndSelect('sub_agent.systemPrompt', 'systemPrompt')
.leftJoinAndSelect('sub_agent.contextTemplate', 'contextTemplate')
.leftJoinAndSelect(
'sub_agent.followupContextTemplate',
'followupContextTemplate',
)
.orderBy('sub_agent.name', 'ASC')
.getMany();
}
async findOne(id: string): Promise<SubAgent> {
const subAgent = await this.subAgentsRepository.findOne({
where: { id },
relations: ['systemPrompt', 'contextTemplate', 'followupContextTemplate'],
});
Iif (!subAgent) {
throw new NotFoundException(`SubAgent with ID "${id}" not found`);
}
return subAgent;
}
async findByBuiltinKey(builtinKey: string): Promise<SubAgent | null> {
return this.subAgentsRepository.findOne({
where: { builtin_key: builtinKey },
relations: ['systemPrompt', 'contextTemplate', 'followupContextTemplate'],
});
}
async update(
id: string,
updateSubAgentDto: UpdateSubAgentDto,
): Promise<SubAgent> {
const subAgent = await this.findOne(id);
// Check if builtin - forbid modification
if (subAgent.is_builtin) {
throw new ForbiddenException(
`Cannot modify built-in sub-agent "${subAgent.name}". Duplicate it to create your own version.`,
);
}
// Serialize enabled_mcp_tools if provided (convert string[] | 'all' to string | null)
const { enabled_mcp_tools, ...rest } = updateSubAgentDto;
const updateData: any = { ...rest };
Iif (enabled_mcp_tools !== undefined) {
updateData.enabled_mcp_tools =
this.serializeEnabledMcpTools(enabled_mcp_tools);
}
this.subAgentsRepository.merge(subAgent, updateData);
return this.subAgentsRepository.save(subAgent);
}
async remove(id: string): Promise<void> {
const subAgent = await this.findOne(id);
await this.subAgentsRepository.remove(subAgent);
}
async findActive(): Promise<SubAgent[]> {
return this.findAll(true);
}
async getAgentByName(name: string): Promise<SubAgent | null> {
return this.subAgentsRepository.findOne({
where: { name, is_active: true },
relations: ['systemPrompt', 'contextTemplate', 'followupContextTemplate'],
});
}
/**
* Duplicate a sub-agent (allowed for built-in sub-agents).
* Creates a user-owned copy with is_builtin=false.
*/
async duplicate(id: string): Promise<SubAgent> {
const original = await this.findOne(id);
// Generate unique name for the duplicate
let newName = `${original.name} (Copy)`;
let suffix = 2;
while (
await this.subAgentsRepository.findOne({ where: { name: newName } })
) {
newName = `${original.name} (Copy ${suffix})`;
suffix++;
}
// Create duplicate with user ownership
const duplicate = this.subAgentsRepository.create({
name: newName,
description: original.description,
system_prompt_id: original.system_prompt_id,
context_template_id: original.context_template_id,
followup_context_template_id: original.followup_context_template_id,
enabled_tools: original.enabled_tools,
enabled_mcp_tools: original.enabled_mcp_tools,
is_active: true,
model_id: original.model_id,
is_builtin: false,
builtin_key: null,
});
return this.subAgentsRepository.save(duplicate);
}
}
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