bash_execute
Execute Bash commands directly with output capture through the MCP Filesystem Server. Provides flexible command execution with security restrictions and environment variable support.
Instructions
Execute a Bash command directly with output capture. More flexible than execute_command but still with security restrictions. Allows for direct access to Bash functionality.
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| command | Yes | The bash command to execute | |
| workingDir | No | Working directory for command execution | |
| timeout | No | Maximum execution time in milliseconds (max 60s) | |
| env | No | Additional environment variables for the command |
Implementation Reference
- src/utils/bash/bash_tools.ts:139-195 (handler)Core handler function that validates and executes the bash command using child_process.exec, captures stdout/stderr/exitCode, with safety checks and logging.export async function bashExecute( args: z.infer<typeof BashExecuteArgsSchema>, config: Config ): Promise<{ stdout: string; stderr: string; exitCode: number }> { // Validate the command validateCommand(args.command) // Validate working directory if provided // Initialize cwd with the current directory and possibly override it const cwd = args.workingDir ? await validatePath(args.workingDir, config) : process.cwd() // Prepare execution options const options = { cwd, timeout: args.timeout || 30000, env: args.env ? { ...process.env, ...args.env } : process.env, encoding: 'utf8' as const, maxBuffer: 10 * 1024 * 1024, // 10MB buffer for output } try { await logger.debug(`Executing bash command: ${args.command}`, { workingDir: cwd, timeout: options.timeout, }) // Execute the command const { stdout, stderr } = await execPromise(args.command, options) await logger.debug(`Command executed successfully: ${args.command}`, { exitCode: 0, stdoutPreview: stdout.substring(0, 100) + (stdout.length > 100 ? '...' : ''), }) return { stdout, stderr, exitCode: 0, } } catch (error: any) { // Handle command execution errors const stderr = error.stderr || '' const stdout = error.stdout || '' const exitCode = error.code || 1 await logger.warn(`Command execution failed: ${args.command}`, { exitCode, stderr: stderr.substring(0, 100) + (stderr.length > 100 ? '...' : ''), }) return { stdout, stderr, exitCode, } } }
- src/utils/bash/bash_tools.ts:69-82 (schema)Zod schema defining the input parameters for the bash_execute tool: command, workingDir, timeout, env.// Schema for bash_execute arguments export const BashExecuteArgsSchema = z.object({ command: z.string().describe('The bash command to execute'), workingDir: z.string().optional().describe('Working directory for command execution'), timeout: z .number() .int() .positive() .max(60000) .optional() .default(30000) .describe('Maximum execution time in milliseconds (max 60s)'), env: z.record(z.string()).optional().describe('Additional environment variables for the command'), })
- src/bash/tools/index.ts:50-99 (handler)MCP-specific handler wrapper: parses args with schema, calls core bashExecute, formats MCP response with content array.export async function handleBashExecute(args: any, config: Config) { const endMetric = metrics.startOperation('bash_execute') try { // Validate arguments const parsed = BashExecuteArgsSchema.safeParse(args) if (!parsed.success) { throw new FileSystemError(`Invalid arguments for bash_execute`, 'INVALID_ARGS', undefined, { errors: parsed.error.format(), }) } // Execute the command const result = await bashExecute(parsed.data, config) // Format the response const formattedResponse = formatCommandResult(result, parsed.data.command) await logger.debug(`Bash command executed: ${args.command}`, { exitCode: result.exitCode, }) endMetric() return { content: [ { type: 'text', text: formattedResponse, }, ], } } catch (error) { metrics.recordError('bash_execute') if (error instanceof FileSystemError) { await logger.error(`Error in bash_execute:`, error.toJSON()) return { content: [{ type: 'text', text: `Error: ${error.message}` }], isError: true, } } const errorMessage = error instanceof Error ? error.message : String(error) await logger.error(`Unexpected error in bash_execute:`, { error }) return { content: [{ type: 'text', text: `Error: ${errorMessage}` }], isError: true, } }
- src/index.ts:356-361 (registration)Tool definition and schema registration in the listTools handler response.name: 'bash_execute', description: 'Execute a Bash command directly with output capture. ' + 'More flexible than execute_command but still with security restrictions. ' + 'Allows for direct access to Bash functionality.', inputSchema: zodToJsonSchema(BashExecuteArgsSchema) as ToolInput,
- src/index.ts:757-758 (registration)Dispatch/handling registration in the callToolRequest switch statement.case 'bash_execute': { return await handleBashExecute(a, config)