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import { InjectRepository } from '@nestjs/typeorm';
import { Repository } from 'typeorm';
import { plainToClass } from 'class-transformer';
import { validate } from 'class-validator';
import { ActionHandler } from './action-handler.interface';
import {
ActionExecutionResult,
PlanExecutionContext,
} from '../llm-orchestration.interfaces';
import { Session, SessionInput, SystemPrompt } from '../../core-entities';
import { GetSessionHistoryArgsDto } from './dto/get-session-history.args.dto';
// LlmContent interface matching what's sent to AI
interface LlmContentPart {
text: string;
}
interface LlmToolCall {
id: string;
type: 'function' | 'web_search' | 'retrieval';
function: {
name: string;
arguments: object | string;
};
}
interface LlmContent {
role: 'user' | 'model';
parts: LlmContentPart[];
tool_calls?: LlmToolCall[];
thoughts?: string;
}
// History entry can be system prompt (with content) or user message (with content) or LlmContent (with parts)
interface SystemPromptEntry {
role: 'system';
content: string;
}
interface UserMessageEntry {
role: 'user';
content: string;
}
type HistoryEntry = SystemPromptEntry | UserMessageEntry | LlmContent;
@Injectable()
export class GetSessionHistoryHandler implements ActionHandler {
readonly toolName = 'get_session_history';
private readonly logger = new Logger(GetSessionHistoryHandler.name);
constructor(
@InjectRepository(Session)
private readonly sessionsRepository: Repository<Session>,
@InjectRepository(SessionInput)
private readonly sessionInputsRepository: Repository<SessionInput>,
@InjectRepository(SystemPrompt)
private readonly systemPromptsRepository: Repository<SystemPrompt>,
) {}
getMetadata() {
return {
name: this.toolName,
description:
'Returns session history in JSON format, using the same structure sent to the AI (LlmContent format)',
arguments: [
{
name: 'session_id',
type: 'string' as const,
description:
'Optional session ID. If not provided, uses the current session from context.',
required: false,
},
{
name: 'limit',
type: 'number' as const,
description:
'Maximum number of conversation turns to return. If not provided, returns all turns.',
required: false,
},
{
name: 'include_system_prompt',
type: 'boolean' as const,
description:
'Whether to include the system prompt in the returned history. Default: false',
required: false,
},
],
};
}
getDefinition(): string {
return `## get_session_history
Returns the session history in JSON format, using the same structure that is sent to the AI (LlmContent format).
### Parameters:
- \`session_id\` (string, optional): Session ID. If not provided, uses the current session.
- \`limit\` (number, optional): Maximum number of conversation turns to return.
- \`include_system_prompt\` (boolean, optional): Whether to include the system prompt. Default: false.
### Returns:
JSON array of conversation turns with the following structure:
\`\`\`json
[
{
"role": "system" | "user" | "model",
"content": "text content" | [{ "text": "content" }],
"tool_calls": [...],
"thoughts": "reasoning content"
}
]
\`\`\`
### Example:
\`\`\`typescript
tool: get_session_history
args: {
"session_id": "session-123",
"limit": 10,
"include_system_prompt": false
}
\`\`\``;
}
async execute(
args: Record<string, any>,
context: PlanExecutionContext,
): Promise<ActionExecutionResult> {
try {
// Validate arguments
const validatedArgs = plainToClass(GetSessionHistoryArgsDto, args);
const validationErrors = await validate(validatedArgs);
if (validationErrors.length > 0) {
const errorMessages = validationErrors
.map((err) => Object.values(err.constraints || {}).join(', '))
.join('; ');
throw new Error(`Validation error: ${errorMessages}`);
}
const { session_id, limit, include_system_prompt } = validatedArgs;
// Determine session ID
let targetSessionId: string;
if (session_id) {
// Explicit session_id provided, use it
targetSessionId = session_id;
} else {
// No explicit session_id, check if current session has a parent
const currentSession = await this.sessionsRepository.findOne({
where: { id: context.session_id },
select: ['id', 'parent_session_id'],
});
if (!currentSession) {
throw new NotFoundException(
`Current session "${context.session_id}" not found`,
);
}
// Use parent session if exists, otherwise use current session
targetSessionId = currentSession.parent_session_id || currentSession.id;
}
// Fetch session with system prompt
const session = await this.sessionsRepository.findOne({
where: { id: targetSessionId },
relations: ['systemPrompt'],
});
if (!session) {
throw new NotFoundException(
`Session with ID "${targetSessionId}" not found`,
);
}
// Fetch session inputs ordered by created_at
const sessionInputs = await this.sessionInputsRepository.find({
where: { session: { id: targetSessionId } },
order: { created_at: 'ASC' },
});
// Apply limit if specified
const limitedInputs = limit ? sessionInputs.slice(-limit) : sessionInputs;
// Build history array
const history: HistoryEntry[] = [];
// Add system prompt if requested
if (include_system_prompt && session.systemPrompt) {
history.push({
role: 'system',
content: session.systemPrompt.prompt_content,
});
}
// Map session inputs to LlmContent format
for (const input of limitedInputs) {
// User turn
if (input.generated_context_string) {
history.push({
role: 'user',
content: input.generated_context_string,
});
// Model turn (if response exists) - only add after user turn
if (input.raw_llm_response || input.tool_calls || input.thoughts) {
const modelTurn: LlmContent = {
role: 'model',
parts: [{ text: input.raw_llm_response || '' }],
};
// Add tool calls if present
if (input.tool_calls) {
try {
modelTurn.tool_calls = JSON.parse(input.tool_calls);
} catch (e) {
this.logger.warn(
`Failed to parse tool_calls for input ${input.id}: ${e.message}`,
);
}
}
// Add thoughts if present
if (input.thoughts) {
modelTurn.thoughts = input.thoughts;
}
history.push(modelTurn);
}
}
}
// Format as JSON for the summary
const jsonOutput = JSON.stringify(history, null, 2);
return {
status: 'SUCCESS',
summary: `Retrieved session history for "${targetSessionId}" with ${history.length} turn(s).\n\n\`\`\`json\n${jsonOutput}\n\`\`\``,
execution_log: {
output: jsonOutput,
},
persisted_args: { session_id: targetSessionId, limit },
};
} catch (error) {
this.logger.error(`Failed to get session history: ${error.message}`);
return {
status: 'FAILURE',
summary: 'Failed to retrieve session history',
error_message: error.message,
execution_log: {
output: '',
error_message: error.message,
},
};
}
}
}
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