Google Tasks MCP — agentic threat model
The Google Tasks MCP agent presents a moderate risk profile, primarily centered around unauthorized modification of user task lists and calendar syncs via OAuth. While its blast radius is narrower than full mail or drive access, it remains vulnerable to indirect prompt injection and orchestrator abuse.
OWASP AIVSS score rationale
| Autonomy of Action | 0.60 | |
| Goal-Driven Planning | 0.30 | |
| Self-Modification | 0.00 | |
| Dynamic Tool Use | 0.40 | |
| Persistent Memory | 0.20 | |
| Contextual Awareness | 0.50 | |
| Dynamic Identity | 0.60 | |
| Multi-Agent Interactions | 0.30 | |
| Non-Determinism | 0.40 | |
| Opacity & Reflexivity | 0.30 |
Scored with the canonical OWASP AIVSS formula (AIVSS calculator reference); agentic risk factors estimated from the agent’s described capabilities.
MAESTRO 7-layer threat model
Per-layer threats for this agent. Layers tagged “not certain from listing” are general, caveated commentary where the public description didn’t pin that layer.
Not certain from the listing — The listing describes an MCP connector rather than the underlying foundation model. Risks like prompt injection or model reprogramming depend entirely on the host LLM executing this tool.
Not certain from the listing — No dedicated RAG or vector database is mentioned. However, the agent interacts with external state (Google Tasks), making it susceptible to data poisoning if malicious tasks are injected into the user's account.
The agent exposes tools for task creation, updates, and deletion. Insecure tool integration or lack of input validation could allow an orchestrator or prompt injection payload to manipulate the user's to-do list maliciously.
Not certain from the listing — The hosting environment (local MCP host vs. cloud) is unspecified. However, secure storage of OAuth refresh and access tokens is critical to prevent host-level credential theft.
Not certain from the listing — There is no mention of built-in logging, audit trails, or guardrails to monitor and intercept unauthorized task modifications.
The agent leverages OAuth scopes to restrict access specifically to Google Tasks, limiting the blast radius compared to broader Gmail or Google Drive integrations, though it still requires robust authorization management.
As an MCP tool, this agent is designed to be called by other agents. This creates a risk of cascading trust abuse, where a compromised parent agent could delete or alter tasks without the user's explicit consent.
MAESTRO — the 7-layer agentic threat-modeling framework (Cloud Security Alliance / Ken Huang).