The server has 5 tools with significant quality gaps. Tool names follow verb_noun convention reasonably well (initialize_sandbox, execute_code, upload_file, get_execution_history, close_sandbox). However, descriptions have major inconsistencies: some are in Chinese, others in English, creating cognitive friction. Parameter descriptions are present but often incomplete or poorly localized. Critical issues: (1) Global state management (Active_Sandboxes, Execution_DB dicts) violates stateless request handling; (2) execute_code returns a TypedDict (CodeOutput) without formal schema documentation; (3) upload_file parameter file_list has type 'array' but no item type specification; (4) No input validation, error categorization, or recovery guidance; (5) Resource endpoint get_execution_history is defined as a resource, not a tool, yet is listed in tool inventory, creating classification confusion. The server is functional but falls short of production-grade tooling patterns.

• Refactor to stateless design: move session storage to a persistent database (Redis, DynamoDB) keyed by session_id. Each request should be self-contained and not rely on module-level dicts. This enables horizontal scaling and concurrent request handling.
• Add formal output schemas to all tools. For execute_code, define CodeOutput schema in the tool definition (not just return annotation). For upload_file, explicitly document return type as {type: 'object', properties: {success: bool, files_uploaded: [string], errors: [string]}}.
• Add parameter constraints. Define upload_file.file_list as {type: 'array', items: {type: 'string'}, description: 'List of absolute file paths to upload'}. Add bounds to timeout: {type: 'integer', minimum: 1, maximum: 3600, default: 1000}.
• Translate all descriptions to English and expand them to 50-150 characters. Example: initialize_sandbox should be 'Create a new isolated Python sandbox environment for secure code execution. Returns a session_id required for all subsequent operations. Requires E2B_API_KEY environment variable.'
• Add error categorization. When session_id not found, return {error: 'Session not found', retryable: false, recovery: 'Call initialize_sandbox() to create a new session'}. When execute_code times out, return {error: 'Code execution timeout', retryable: true, recovery: 'Increase timeout parameter or optimize code'}.
• Add security documentation in tool descriptions. execute_code should warn: 'Accepts arbitrary Python code, ensure input is validated and trusted. Supports read/write to sandbox filesystem only, not host.' upload_file should warn: 'Validates paths to prevent traversal attacks; relative paths resolved within sandbox root.'

Inferred effective spec: 2025-06-18+.

• Relies on Logging (deprecated) - log to stderr or use OpenTelemetry