P3: Securing AI Tool Execution & Preventing Unauthorised Actions Across Supply Chains

Define an explicit tool allow-list for each agent and enforce it through a policy engine so no undeclared tool can be invoked.

Apply version control and peer review to prompt repositories, scripts, and memory definitions exactly as you would to application code.

Require cryptographic identity verification for each agent before it is permitted to call any tool or external function.

Classify every data asset by sensitivity and enforce per-tool, per-agent allow-lists governing which data classes may be read or written.

Run every AI-invoked tool inside an isolated, containerised sandbox with no access to sensitive resources or the production network.

Apply strict CPU, memory, and syscall limits inside the sandbox to prevent resource exhaustion or privilege abuse.

Tear down and recreate the sandbox after each tool execution to prevent an attacker from establishing persistence or moving laterally.

When tools are called via inter-agent protocols such as A2A or MCP, sanitise responses, validate tool descriptions, and attest server identity before use.

Rate-limit all agent API calls and computationally expensive task invocations to prevent abuse and resource exhaustion.

Block tool execution in real time when the agent's risk score exceeds a predefined threshold, keeping autonomy within policy bounds.

Grant tool access only at the moment it is needed and revoke it immediately upon completion, never persisting elevated permissions.

Digitally sign all agent cards, prompt templates, and model definitions, and publish a verifiable SBOM for every agent and its runtime components.

Bind tool-call parameters to a cryptographic attestation of the user's stated intent so invocations cannot drift from the original task.

Record every tool interaction with actor attribution and tamper-evident signatures to support forensic investigation.

Detect and isolate command-chaining sequences that would allow an agent to circumvent individual tool-access policies.

Gate high-impact tool executions (financial, medical, administrative) behind explicit human approval with a risk-prioritised review queue.

Maintain signed, detailed execution logs for every tool call so anomalies can be detected and investigations reconstructed accurately.

Block execution of AI-generated code with elevated privileges until a human reviewer has approved it.

Flag any agent invoking the same tool at an abnormally high frequency within a short window, as this is a reliable indicator of abuse.

Monitor every tool interaction for unintended side effects and cross-audit outcomes against the agent's declared intent.

Track agent workload in real time and alert when any single agent exceeds its allocated processing quota.

Automatically suspend any AI process that breaches a predefined resource threshold, degrading gracefully rather than failing open.

Run static analysis and secret scanning on all AI-generated code before execution, blocking any attempt to bypass security constraints.

Aggregate resource consumption across all agents in a fleet to catch coordinated exhaustion attacks that stay below per-agent thresholds.

Cap concurrent system modification requests an agent may initiate to prevent runaway self-modification loops.

Continuously scan agent SBOMs for newly disclosed vulnerabilities or indicators of compromise in supply-chain dependencies.

Red-team the agent by injecting simulated poisoned supply-chain components to verify that security boundaries hold under realistic attack conditions.