Give an AI agent only the tools, data and authority it needs for the task at hand. Start with read-only access where possible, grant writing or external actions separately, and require independent authorization for consequential steps such as sending, deleting, executing code, moving money or changing permissions.
Choose permissions by task, not by convenience
Before connecting an agent to an account or system, define the outcome it must produce. Then remove tools and access that do not contribute to that outcome. A document summarizer may need to search and read selected messages; it does not automatically need permission to send or delete them.
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OWASP recommends limiting extensions to the minimum necessary and warns about excessive functionality, excessive permissions and excessive autonomy. Its examples distinguish lower-risk search and reading from higher-impact writing, sending email, code execution, deletion and fund transfers. Those are illustrative categories, not universal ratings for every system. See the OWASP AI Agent Security Cheat Sheet and OWASP’s LLM06:2025 guidance on excessive agency.
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A practical permission checklist
- Define the task and outcome. State what the agent should produce or change. Do not grant an unrelated tool just because it is available.
- Choose the smallest useful tool set. Prefer a purpose-built operation, such as searching a selected collection, over a broad command interface.
- Limit the reachable data. Restrict access to the relevant files, records, repository or account. Consider both which resources are reachable and what operations the agent can perform on them.
- Use a task-specific identity. Give the agent a distinct or delegated identity with only the downstream rights required. Avoid shared personal credentials and generic privileged accounts; the identity should make its actions attributable.
- Begin with read-only access. If the task can be completed by observing or preparing a draft, do not enable changes. Reading and writing are separate capabilities and should be authorized separately.
- Grant only necessary writes. Scope edits to a target and operation. Treat sending, posting, code execution, deployment, deletion, financial transactions and access changes as distinct permissions, not as an undifferentiated “write” grant.
- Put authorization outside the model. Validate each request in the tool or downstream system. For consequential actions, check the actor, tool, target, parameters and time window; fail closed if policy or required approval cannot be verified.
- Constrain broad tools and execution. Review and allowlist integrations, validate arguments, limit filesystem and network access, and use a sandbox for coding agents. Where suitable, use task-scoped ephemeral credentials rather than long-lived broad credentials.
- Make approval prompts meaningful. Require human confirmation for high-impact actions, but avoid prompts for every trivial operation. Repeated low-value requests can create consent fatigue and encourage reflexive approval.
- Log activity and revisit grants. Monitor tool calls and downstream actions, and use rate limits where appropriate. Remove unused integrations and recheck permissions when tools or their definitions change.
Use a permission ladder
This ladder is a practical way to discuss capability, not a formal NIST or OWASP rating scale. NIST describes read-only, constrained-write and write patterns; OWASP examples show why sending, executing and deleting deserve separate scrutiny.
#1 Best Overall
| Level | Typical capability | Practical default |
|---|---|---|
| Observe | Search or read a defined set of resources | Allow only the sources needed for the task. |
| Prepare | Draft a change, message or plan without committing it | Use when a person can review before execution. |
| Constrained write | Make a narrow, reversible change in a limited resource | Scope by target and operation, and log the action. |
| High-impact action | Send externally, execute code, delete data, move money, change access or deploy | Require independently enforced authorization and meaningful confirmation; add stronger controls when the action is difficult to reverse. |
When should an agent be allowed to change or send things?
Only when the task requires it, and only for the specific operation and target. Drafting an email is different from sending it; proposing a file edit is different from committing it. Keep the first step reversible where possible, then require a separate check before an externally visible, costly, destructive or difficult-to-undo action.
Approval should be attached to the actual action, not treated as a general permission slip. A confirmation for one message, recipient and set of parameters should not silently authorize different recipients or later actions. The control should be enforced by the tool or downstream system rather than relying on the model to decide whether it is allowed.
What changes for coding agents?
Coding agents may combine repository access with shell commands, network access, package installation or deployment tools. That makes environment boundaries important: restrict filesystem and network access to what the task needs, run code in a sandbox, validate tool arguments, and allowlist reviewed MCP servers and tools. Use credentials scoped to the task and expire them when no longer needed. OWASP’s Secure Coding with AI Cheat Sheet provides guidance specifically for coding environments.
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsKeep the boundary in the system, not in the prompt
An instruction such as “do not delete files” is not a substitute for removing deletion capability or enforcing authorization downstream. Each tool operation should be checked against policy, including the requested resource and parameters. If the check fails or an approval cannot be confirmed, the system should not perform the action.
Logs and monitoring help identify unexpected activity and limit its scale, but they do not prevent an unauthorized operation by themselves. Least privilege and independent authorization remain the primary controls.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Review permissions when the setup changes
Reassess access when the task changes, an integration is added, or a tool’s capabilities or definition are updated. A permission that was appropriate for one workflow may be excessive in another, and unused extensions can remain exposed. Keep the grant aligned with the current task rather than letting it accumulate into standing access.
NIST’s 2025 tool-use taxonomy covers perception, reasoning and action tools and distinguishes constraints such as read-only, constrained-write and write. Its agent identity guidance discusses distinct identities, scoped authorization, sandboxing and consent fatigue. These are useful concepts for risk assessment, not a single prescriptive permission standard.
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