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import { ActionHandler } from './action-handler.interface';
import {
ActionExecutionResult,
ToolMetadata,
} from '../llm-orchestration.interfaces';
import { RequestContextArgsDto } from './dto/request-context.args.dto';
import { plainToClass } from 'class-transformer';
import { validate } from 'class-validator';
import { generateToolCall, generateToolCallJson } from '../../utils';
import { ContextGenerationService } from '../../context-generation/context-generation.service';
import { ApplicationStateService } from '../../application-state/application-state.service';
import { countTokens } from 'gpt-tokenizer';
@Injectable()
export class RequestContextHandler implements ActionHandler {
readonly toolName = 'request_context';
private readonly logger = new Logger(RequestContextHandler.name);
constructor(
private readonly contextGenerationService: ContextGenerationService,
private readonly applicationStateService: ApplicationStateService,
) {}
getMetadata(): ToolMetadata {
return {
name: this.toolName,
description: this.getDefinition(true),
arguments: [
{
name: 'files',
type: 'string',
description: 'A comma-separated list of relative file paths to read.',
required: false,
},
{
name: 'folders',
type: 'string',
description:
'A comma-separated list of relative folder paths to read.',
required: false,
},
],
};
}
/**
* Generates a tool call example in the specified format.
* @param toolCall - The tool call object to format
* @param useJson - If true, uses JSON format; otherwise uses XML-style format
* @returns Formatted tool call string
*/
private generateExample(
toolCall: Record<string, any>,
useJson: boolean = false,
): string {
return useJson
? generateToolCallJson(toolCall)
: generateToolCall(toolCall);
}
getDefinition(useJsonFormat: boolean = false): string {
const filesExample = this.generateExample(
{
tool_name: this.toolName,
files:
'src/App.tsx,src/theme/ThemeProvider.tsx,src/store/session.slice.ts,src/lib/api/client.ts',
},
useJsonFormat,
);
const foldersExample = this.generateExample(
{
tool_name: this.toolName,
folders: 'src/components/common,src/hooks',
},
useJsonFormat,
);
const definition = `
-------------
### ${this.toolName}
Requests content of files or entire folders to build context before making changes.
This is a crucial exploration tool. It is efficient to request many files at once.
#### Parameters
- "files": (string, optional) A comma-separated list of relative file paths to read.
- "folders": (string, optional) A comma-separated list of relative folder paths to read.
#### Example: Files
:${filesExample}
#### Example: Folders
:${foldersExample}
-------------
`;
return `\n${definition.trim()}\n`;
}
async execute(
args: { [key: string]: any },
context: { system_prompt_id?: string | null },
): Promise<ActionExecutionResult> {
const validatedArgs = plainToClass(RequestContextArgsDto, args);
const errors = await validate(validatedArgs);
if (errors.length > 0) {
const errorMessages = errors
.map((err) => Object.values(err.constraints || {}).join(', '))
.join('; ');
return {
status: 'FAILURE',
summary: `Invalid arguments for ${this.toolName}.`,
error_message: errorMessages,
persisted_args: args,
execution_log: { output: '', error_message: errorMessages },
};
}
const { files, folders } = validatedArgs;
const fileList = files ? files.split(',').map((f) => f.trim()) : [];
const folderList = folders ? folders.split(',').map((f) => f.trim()) : [];
const outputParts: string[] = [];
let errorMessage = '';
// Fetch files
for (const filePath of fileList) {
try {
const content =
await this.contextGenerationService.secureReadFile(filePath);
outputParts.push(content);
} catch (error) {
this.logger.warn(`Failed to fetch file ${filePath}: ${error.message}`);
outputParts.push(`Error: File not found at '${filePath}'`);
}
}
// Fetch folders using glob
for (const folderPath of folderList) {
try {
const folderFiles = await this.contextGenerationService.secureGlob(
`${folderPath}/**/*`,
);
for (const file of folderFiles) {
try {
const content =
await this.contextGenerationService.secureReadFile(file);
outputParts.push(content);
} catch (error) {
this.logger.warn(`Failed to fetch file ${file}: ${error.message}`);
outputParts.push(`Error: Could not read file '${file}'`);
}
}
} catch (error) {
this.logger.warn(
`Failed to glob folder ${folderPath}: ${error.message}`,
);
outputParts.push(`Error: Could not read folder '${folderPath}'`);
errorMessage += `Failed to read folder '${folderPath}'. `;
}
}
const output = outputParts.join('\n\n');
// Check token limit
const tokenCount = countTokens(output);
const tokenLimit =
await this.applicationStateService.getEffectiveFollowupTokenLimit(
context.system_prompt_id,
);
if (tokenCount > tokenLimit) {
const limitErrorMessage =
`Context too large: ${tokenCount} tokens (limit: ${tokenLimit}). ` +
`Request fewer files or smaller folders. Consider using specific file paths instead of entire folders.`;
this.logger.warn(
`Context request exceeded token limit: ${tokenCount} > ${tokenLimit}`,
);
return {
status: 'FAILURE',
summary: `Context request exceeded token limit.`,
error_message: limitErrorMessage,
persisted_args: validatedArgs,
execution_log: { output: '', error_message: limitErrorMessage },
};
}
return {
status: 'SUCCESS',
summary: `Fetched ${fileList.length} files and ${folderList.length} folders (${tokenCount} tokens).`,
persisted_args: validatedArgs,
execution_log: { output, error_message: errorMessage },
};
}
}
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