Ensuring Safety & Security
in Tool Execution
As AI systems gain the ability to call tools, run code, and interact with external services, rigorous safety protocols become the foundation of trustworthy automation.
Core Safety Pillars
Sandboxed Execution
Tool calls run in isolated environments with no access to the host system or other sessions. Containers and virtual environments prevent lateral movement.
Least Privilege
Each tool is granted only the minimum permissions required for its task. No tool should hold standing access beyond what a single operation demands.
Input Validation
All arguments passed to tools are sanitised, type-checked, and validated against a strict schema before execution begins — injection attacks are rejected early.
Audit Logging
Every tool invocation — including its caller, inputs, outputs, and timestamp — is recorded immutably so anomalies can be traced and reviewed post hoc.
Rate Limiting & Timeouts
Calls are throttled per-session and hard-capped by execution time. Runaway tools are terminated automatically before they exhaust resources or cause side-effects.
Human-in-the-Loop
Sensitive or irreversible actions — deleting data, sending messages, spending money — require explicit human confirmation before the tool is allowed to proceed.
The Execution Pipeline
Design Principles
Fail closed, not open
When a permission check is ambiguous or a validation step errors out, the system must deny the call rather than allow it. Safety defaults must be the most conservative path.
Declarative tool manifests
Every tool publishes a machine-readable manifest describing its capabilities, required permissions, and expected I/O shapes so the orchestrator can enforce policy without trusting tool implementations themselves.
Immutability of audit trails
Logs are append-only and cryptographically signed. Neither the model nor the tool can retroactively modify records, ensuring forensic integrity for compliance and incident response.
Zero-trust between components
No tool trusts the identity or data provided by another tool. Every inter-component communication is authenticated and authorised independently, even within the same session.
Graceful degradation over failure propagation
If a tool fails, the error is contained and surfaced to the user clearly — it does not cascade into side-effects on unrelated systems or corrupt the broader session state.
Prompt injection vigilance
Tool inputs sourced from external content (web pages, documents, emails) must be treated as untrusted data. Malicious actors embed instructions designed to hijack tool calls — always sanitise and scope-check external content before passing it to any executor.
