This SSH server has 4 tools with basic naming (all start with ssh_ verb-prefix) and present descriptions. However, significant gaps exist: input schemas lack JSON Schema type annotations; parameter descriptions are minimal or absent in schema format; no output schemas are documented; error messages are user-friendly but lack recovery guidance for agents; no permission gates or audit logging despite security-sensitive operations; no tool annotations (readOnlyHint, destructiveHint, idempotentHint) to guide agent decision-making. The code is well-commented and the allowlist mechanism is sound, but the MCP interface itself is underdeveloped for production agent use.

• Add formal JSON Schema definitions for input and output on all tools. For ssh_exec, document the return object as {"command": string, "host": string, "exit_code": int, "stdout": string, "stderr": string, "duration_seconds": float}. For ssh_get_config, return {"ssh_host": string, "ssh_user": string, "ssh_port": int, "ssh_key": string, "command_timeout_seconds": int}.
• Enhance parameter descriptions with constraints and examples. For ssh_exec command parameter, add: 'Must match one of the approved regex patterns from ALLOWED_COMMANDS. Examples: "systemctl status sshd", "df -h", "docker ps -a". Call ssh_list_allowed() to see all patterns.'
• Add tool annotations: ssh_exec should have destructiveHint=true and idempotentHint=true (re-running the same command is side-effect safe if it is idempotent); ssh_list_allowed, ssh_test_connection, ssh_get_config should have readOnlyHint=true.
• Implement permission gates and scope declarations. Add a scope parameter or environment variable like 'AGENT_SCOPES=ssh.exec,ssh.test' and validate before executing ssh_exec. Log all calls with timestamp, user/agent ID, command, result, and exit code for audit compliance.
• Enrich error messages with recovery guidance. When command is denied, include: 'DENIED: Command is not in the allowlist. Call ssh_list_allowed() to see permitted patterns. Example: "systemctl status sshd"'. When connection fails, suggest 'Check SSH_HOST, SSH_USER, SSH_KEY env vars and file permissions (chmod 600).'
• Expand tool descriptions to 100 - 200 characters with context on when to call. E.g., ssh_test_connection: 'Validates SSH connectivity and displays remote server information (hostname, OS). Call this first to verify configuration before running commands.'