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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchGive an always-on AI agent only the access its specific task requires: read-only by default, narrowly scoped writes when necessary, and human approval for high-impact or hard-to-reverse actions. Enforce permissions in the systems the agent uses—not just in its prompt—and make credentials task-bound and short-lived where possible.
Use least privilege as a practical permission plan
“Limited access” is not specific enough. Decide what the agent may do, which resources it may touch, whose authority it uses, how long access lasts, and whether an action needs approval. OWASP recommends giving an agent only the tools and permissions needed for its task. A mail summarizer that only reads messages, for example, does not need permission to send them; a product recommender may need to read a product table without access to unrelated tables or write operations. OWASP AI Agent Security Cheat Sheet
- Action: Specify read, draft, create, edit, delete, send, publish, execute, deploy, or administer.
- Resource: Name the files, mail folders, tables, repositories, channels, accounts, or records in scope. Avoid grants covering an entire workspace or system when a subset will do.
- Identity and context: Keep actions within the authority of the initiating user, tenant, session, and task. Avoid shared administrator credentials that bypass the user’s normal limits.
- Duration: Prefer a task-scoped grant that expires when the task completes, times out, or is cancelled, rather than a standing credential.
- Environment: Distinguish trusted internal data from untrusted websites, email, repositories, and third-party tools. Narrow access further while the agent handles untrusted content.
- Approval: Identify which actions require a person to review the exact operation and target before execution.
OWASP’s AI Security and Privacy Guide and LLM06:2025 Excessive Agency recommend authorization checks in downstream systems rather than relying on an LLM to decide whether an action is allowed.
Choose the right level of access
NIST distinguishes read-only, constrained-write, and write access for agent tools. The right level depends not only on the operation but also on what the tool can reach and the environment in which it runs. A narrowly defined API operation in a trusted environment presents a different exposure from a browser acting on untrusted content. NIST, Lessons Learned from the Consortium: Tool Use in Agent Systems
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| Permission choice | Use it when | Example boundary |
|---|---|---|
| Read-only | The task requires retrieving or summarizing information, not changing it. | Read messages from a named mailbox or records from a specific database table. |
| Constrained write | The agent needs to make routine, limited changes that are reviewable or reversible. | Edit files only in a designated worktree or create a draft without permission to send it. |
| Approval-bound write | The action is consequential, externally visible, destructive, financial, or difficult to reverse. | Require a person to approve the exact recipient, content, payment, deletion, or deployment before execution. |
Compare any proposed configurations across the dimensions below. Moving toward the right-hand column increases exposure and usually calls for tighter scope or stronger oversight.
| Dimension | Lower exposure | Higher exposure |
|---|---|---|
| Action | Read or draft | Send, publish, delete, execute, deploy, or administer |
| Resource scope | Named resource or subset | Entire account, workspace, or system |
| Data sensitivity | Public or task-specific data | Personal, confidential, financial, or credential data |
| Duration | Task-scoped, expiring grant | Persistent or long-lived credential |
| Reversibility | Easy to review or undo | Irreversible, costly, or externally visible |
| Trust boundary | Validated internal source | Untrusted web, email, repository, or third-party tool |
| Enforcement | Backend policy check on every call | Prompt-only instruction or one-time approval |
Enforce permissions outside the prompt
A system prompt can tell an agent not to send a message, but it cannot stop a tool from sending one if the tool’s credentials allow it. OWASP’s guidance is direct: “Implement authorization in downstream systems rather than relying on an LLM to decide if an action is allowed or not.” OWASP Gen AI Security Project, LLM06:2025 Excessive Agency
Put the boundary in the tool or service backend. Validate each call against the user’s authority, the allowed tool and operation, and the target resource. Use narrow tool schemas and per-tool or per-operation allowlists; separate read and write credentials; and issue ephemeral permissions for the task rather than a broad, durable token. If the system cannot reliably enforce a requested boundary, do not give the agent that capability.
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Require approval for consequential actions
Require a human checkpoint before the agent sends messages, publishes content, initiates payments, changes privileges, performs bulk deletion, deploys to production, or takes another high-impact action. The approval screen should show the actual action, destination or target, and parameters—not merely the agent’s explanation of what it intends to do.
The execution layer should independently validate both authorization and approval. An approval does not grant the agent authority it otherwise lacks. For irreversible operations, OWASP also recommends short-lived authorization artifacts and replay protection so an approval cannot be reused outside its intended context. Deny an action if its authorization or approval cannot be validated; do not make a person approve every low-risk read just to compensate for weak backend controls. OWASP AI Agent Security Cheat Sheet
Limit what an always-on agent can do with untrusted content
An always-on agent may encounter new instructions in email, web pages, documents, and tool outputs long after a person configured it. Those sources can contain indirect prompt injections. OWASP describes the risk of a mail assistant with mailbox access being induced by a malicious message to forward private content. Reduce the potential damage by limiting the agent to read-only mail access when possible, using reading-only OAuth scopes, or making it draft messages for a person to review and send. OWASP Gen AI Security Project, LLM06:2025 Excessive Agency
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For risky documents or web content, OWASP describes quarantined parsing: a tool-isolated model can read and extract information without access to tools that act on the world. This separation reduces the consequences of malicious input, but it is not a replacement for validating inputs, using least-privilege scopes, or requiring approval for destructive actions. A guardrail model can also be vulnerable. OWASP LLM Prompt Injection Prevention Cheat Sheet
Contain coding agents and system access
Repository issues, pull requests, dependency files, and fetched pages may contain attacker-controlled content that influences a coding agent. An agent running with a developer’s full permissions can turn that influence into file changes or system actions. OWASP’s coding guidance recommends auditing and allowlisting tool servers, pinning tool definitions, sandboxing execution, restricting commands and network egress, and using task-scoped ephemeral credentials. OWASP Secure Coding with AI
A practical setup can confine the agent to the particular repository in a disposable worktree or development container. Allow routine reads and edits inside that workspace, but set boundaries for operations that expand its reach or persist beyond the task:
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- Keep production credentials, SSH keys, and unrelated cloud credentials out of the agent’s reachable environment.
- Gate package installation and network access according to the task, and restrict outbound connections when they are not needed.
- Review access to secrets, CI configuration, and persistent agent instructions before allowing changes.
- Keep deployment credentials out of routine coding access; require a separate authorization path for deployments.
These are applications of OWASP’s least-privilege and sandboxing recommendations, not a universal configuration. The right repository, command, and network boundaries depend on what the coding task must accomplish and what consequences an error could have.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.A default policy to start from
- List the task’s necessary inputs and outputs, then grant access only to those resources.
- Start with read-only access. Add a narrowly scoped write operation only when the task cannot be completed without it.
- Use the initiating user’s authority and task-bound credentials, with backend checks on every tool call.
- Set approval gates for high-impact, external, destructive, financial, administrative, or hard-to-reverse actions.
- Reduce capabilities further when the agent handles untrusted content, and isolate code execution from secrets and production systems.
- Make unknown or unvalidated actions fail closed rather than inherit a broader permission.
The exact resource list and approval threshold depend on the agent’s task, data sensitivity, downstream systems, and the consequences of mistakes. Official guidance does not establish one permission preset that is safe for every always-on agent.
Frequently Asked Questions
Should an always-on agent get write access?
Only if its task requires writing. Keep the grant limited to the relevant resource and operation, and require approval for consequential changes.
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Is a system prompt that says “do not send” enough?
No. The mail or messaging service must enforce authorization independently; an instruction in the prompt does not revoke the tool’s ability to send.
Should the agent use my account or a shared administrator account?
Use the initiating user’s authority, with the minimum privileges needed for the task. Avoid shared administrator credentials that bypass that authority.
What changes when an agent reads email, web pages, or repository content?
Treat those inputs as untrusted and limit the tools available while the agent processes them. Keep sensitive outbound actions behind review.
Should approvals apply to every tool call?
No. Narrowly authorized low-risk reads can proceed without individual approval; reserve explicit review for high-impact actions. Approval supplements, but does not replace, authorization.
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