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An AI agent connected to your email, files, calendar, or financial apps can generally act within the access those connections provide. Before granting access, check exactly what it can read or change, limit it to the task, protect the credentials behind the connection, and require a clear human check before consequential actions. No single safeguard makes an agent completely safe.
Is it safe to let an AI agent access your email or other apps?
It depends on what the agent can access and do. An agent may inherit the connected account’s permissions: a tool that can read messages has a different risk from one that can also send or delete them. Broader access creates more ways for a mistake or an attacker-directed action to affect your account. OWASP identifies risks including prompt injection, tool abuse, data exfiltration, excessive autonomy, and exposure of sensitive data in its AI Agent Security Cheat Sheet.
There is also a risk in the content the agent reads. A message, document, or webpage can contain malicious instructions intended to redirect the agent. NIST describes this as agent hijacking, a form of indirect prompt injection, in its January 17, 2025 article on agent hijacking. So “only summarize this email” is not, by itself, a security boundary: the agent may still encounter hostile instructions while doing that task.
Use the agent only when the access and actions it needs are clear. Treat an authorization request as a decision about what the agent could do—not merely a routine setup screen.
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What permissions should you give an AI agent?
Give it the least access that can accomplish the task. If you want a summary, look for read-only access. If it needs only one folder, calendar, or mailbox, prefer a connector that can limit access to that resource. Decline unrelated permissions, especially the ability to send, delete, purchase, share, or change account settings when those actions are not needed.
OWASP recommends limiting available extensions, functions, and downstream permissions, and using the user’s identity with the minimum necessary OAuth scope. Its LLM06:2025 Excessive Agency guidance describes a mailbox example in which read-only OAuth access and manual review before sending constrain potential harm. Exact permission options vary by app and connector.
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Check an app’s authorization screen
- Read the requested access before approving it. Look for what information the connector can read and what actions it can take.
- Decline scopes unrelated to the task. If the task is reading or summarizing, prefer read-only access when available.
- Check whether access can be limited to particular resources, such as a folder or calendar, rather than an entire account.
- After connecting, review the account’s connected-app or authorization settings. Revoke access you no longer need.
Do not assume the agent will reliably enforce its own limits. OWASP LLM06:2025 says, “Implement authorization in downstream systems rather than relying on an LLM to decide if an action is allowed or not.” In practical terms, the app or service should restrict what the connection can do; a request in the chat to “never send anything” is not a substitute for removing send permission.
How can you reduce the risk of prompt injection?
Assume that text an agent retrieves from email, files, or websites could be untrusted—even if you asked the agent to perform a harmless task on it. A malicious instruction embedded in that content may try to make the agent take an unintended action. NIST’s description of agent hijacking explains how instructions inserted into data an agent ingests can cause harmful, unintended actions.
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The practical defense is to limit what the agent is authorized to do independently. A hostile message should not be enough to authorize sending a reply, deleting records, purchasing something, or sharing private information. Keep those actions behind permission controls and, where appropriate, a separate confirmation from you.
How should you protect the credentials behind an agent connection?
Treat passwords, API secrets, authorization tokens, and other credentials as sensitive. Do not paste a password or API secret into a prompt or ordinary chat. Use the integration’s supported authorization flow instead, and review the account’s connected-app grants so you can revoke access that is no longer required.
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OWASP’s MCP Top 10 identifies hard-coded credentials, long-lived tokens, and secrets stored in model memory or protocol logs as exposure risks; it recommends short-lived, scoped credentials and secret-scanning controls. NIST’s agent identity and authorization guidance also discusses risks from static tokens and agents operating with local user credentials and broad entitlements. MCP is one protocol ecosystem, not a feature used by every agent, so its protocol-specific risks should not be assumed to apply identically to every connection.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.When should an agent need your approval?
Reserve approval for actions with meaningful consequences: exposing data, spending money, changing account access, or doing something difficult to reverse. Make the confirmation specific enough that you can see the action and its target before approving it. A request to “continue” is less useful than a clear description of what will be sent, deleted, purchased, or changed.
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OWASP recommends user approval for high-impact actions and calls for action-bound approvals, short-lived authorization artifacts, and step-up authentication for critical actions in its AI Agent Security Cheat Sheet. NIST also warns that excessive approval prompts can train people to approve reflexively. Use narrow permissions to contain routine tasks, and keep approval checkpoints for consequential ones rather than prompting for every low-risk step.
How to compare an agent connector before you connect it
Use these questions to compare connectors or account settings; a familiar brand name alone does not tell you how much access a particular integration requests.
Quick Recap
- Scope: What information can it access, and can permissions be limited to a specific resource?
- Read versus write: Is there a read-only option, or can it also send, delete, purchase, share, or change settings?
- Credential handling: Does the integration use a supported authorization flow, and does it explain how tokens are limited or expire?
- Review and revocation: Can you see what access you granted and revoke it from your account settings?
- Approval: Does a consequential action require an explicit confirmation that names the action and target?
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