The safest default is least privilege: give an AI agent only the files, applications, tools, identity, and network access required for one task; make that access read-only whenever possible; isolate execution; require approval for consequential actions; and revoke the connection when the task ends. There is no universal “safe mode” switch. Controls vary by agent, operating system, browser, cloud service, and integration, so treat access as a set of separate permissions you can inspect and narrow.
What you are actually limiting
An agent’s authority has at least three dimensions. First is the resource: a particular file, folder, mailbox, database, application, API, browser profile, or device. Second is the operation: read, create, edit, send, delete, purchase, change settings, or execute code. Third is the environment: a trusted workspace, a production account, or an untrusted web page, email, document, or downloaded script.
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NIST’s August 5, 2025 tool-use taxonomy separates read-only, constrained-write, and write capabilities and considers whether the tool operates in trusted or untrusted environments. NIST summarizes the distinction this way: “Some tools may enable read-only actions, while others enable (“write”) actions that impact state.” NIST’s tool-use article also notes that the exact access pattern depends on the implementation and deployment.
Apply the smallest useful combination of those dimensions. A research agent might read a project folder and public web pages but have no ability to edit files, send email, or run programs. A drafting agent might create files in a temporary workspace but require your confirmation before copying them into a shared drive. A production automation agent may need write access, but only to one system, through a narrowly scoped service identity, with logging and a human approval step for irreversible changes.
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Inventory access before you change it
Do not start by hunting for a single permission toggle. First make a short inventory of everything the agent can see or invoke. Review the agent’s settings, connected-account page, tool list, workspace configuration, and any operating-system or browser permissions.
Files and data stores
- List the folders, cloud drives, databases, calendars, mailboxes, contact lists, photos, backups, and removable drives exposed to the agent.
- Identify sensitive contents inside an otherwise ordinary location: tax records, medical information, identity documents, private keys, password-manager exports, confidential work, and children’s data.
- Check whether the agent can discover files outside the folder you selected through search indexes, mounted volumes, synchronization clients, or backup APIs.
Applications and accounts
- Record every connected application, OAuth grant, API token, browser profile, plug-in, and service account.
- Note whether a connection covers one project or an entire account. “Read your data” can still expose a large mailbox or drive.
- Determine whether the agent can act as you, or uses a separate identity with its own roles and audit trail.
Tools and actions
- Separate information retrieval from state-changing tools such as file editing, email sending, deletion, purchasing, account changes, and code execution.
- Check for indirect capabilities. A generic shell, database console, browser automation tool, or unrestricted HTTP client can often reach more systems than its label suggests.
- Find out whether tools are allowlisted, whether arguments are constrained, and whether the product asks for approval before execution.
Network and execution context
- Identify outbound network access, internal services, local-machine access, shared drives, and mounted secrets.
- Determine whether the agent runs locally, in a vendor cloud, or partly in both places. A local operating-system permission cannot by itself restrict data that an already connected cloud account can access.
- Establish where prompts, uploaded files, tool results, and logs are stored and who can administer them.
Write the inventory down. It becomes the baseline for deciding what to remove and for checking later that a connection did not expand.
Choose read-only, constrained-write, or write access
Match the operation to the task rather than granting the broadest permission offered by an integration. This comparison is a practical way to make the choice explicit.
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| Permission level | Typical capability | Appropriate use | Controls to add |
|---|---|---|---|
| Read-only | List, search, view, or summarize selected data; no state change | Research, classification, status reports, and drafting from reference material | Specific folders or records, sensitive-data exclusions, logging, and a separate identity where available |
| Constrained-write | Create or edit only within an approved location or schema | Generating reports in a work folder, updating a test database, or preparing drafts | Path or record allowlists, size and field limits, versioning, previews, and approval before publication |
| Write | Actions that change external state, send messages, delete data, or execute commands | Automations whose business purpose truly requires a state change | Dedicated service identity, least-privilege roles, argument validation, two-person or human approval for high-impact actions, and detailed audit logs |
Use a temporary staging area for generated material. Let the agent create a draft or proposed change there, inspect the result, and then perform the final move or send yourself. If an integration offers only account-wide write access for a task that needs one record, look for a narrower API, a separate project, or a different workflow instead of accepting the excess authority.
Limit file and personal-data access
Create a dedicated workspace
Make a folder or project containing only the inputs and outputs needed for the job. Share that location with the agent instead of your home directory, whole cloud drive, or synchronized desktop. Keep unrelated personal data outside the workspace, and avoid mounting an entire disk simply because one file is needed.
Use copies or sanitized extracts when possible. Remove embedded comments, hidden sheets, document history, EXIF location data, and unrelated rows before upload. For a spreadsheet task, provide the necessary columns rather than the complete customer table. For a document task, replace names, addresses, account numbers, and identifiers with consistent placeholders if the real values are not required.
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Exclude secrets and high-impact files
- Do not expose password stores, private cryptographic keys, recovery codes, browser-cookie databases, or cloud-credential files to a general-purpose agent.
- Keep operating-system directories, application configuration, backups, and other users’ home folders outside the agent workspace.
- Use file-system permissions and separate operating-system accounts to enforce the boundary; an instruction in the prompt is not an access control.
Check hidden access paths
Search and indexing services may reveal names or snippets from locations you did not deliberately share. Disable the agent’s access to global search, unmount unrelated volumes, and review synchronization settings. If the agent can use a browser, remember that a browser profile may contain active sessions, saved addresses, downloads, and extensions in addition to the page you asked it to read.
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Least privilege applies to processes and system accounts, not only to human users. NIST SP 800-171 Rev. 3 describes permitting only the access needed for a task, reviewing that access, and removing it when the need ends. That publication addresses protection of controlled unclassified information in nonfederal systems; the principle is broadly useful, but its requirements do not automatically govern every consumer agent.
Restrict connected apps and identities
Prefer narrow scopes
When connecting an app, choose a project, label, folder, or resource-specific scope over “all files,” “full account,” or administrator access. A read-only calendar scope is different from permission to create, change, or cancel events. A mailbox search scope is different from permission to send or delete messages. If the consent screen combines reading and writing, check whether the provider offers separate integrations or roles.
Use a separate identity
Where supported, create a dedicated user, workspace, service account, or browser profile for the agent. Give it only the role needed for the task, omit administrator privileges, and avoid reusing your personal session. A separate identity makes activity easier to attribute and lets you disable the agent without disrupting your own access.
Control tokens and sessions
- Set an expiration or short lifetime for API tokens and OAuth grants when the product permits it.
- Do not paste long-lived secrets into prompts, documents, or environment variables visible to tools that do not need them.
- After a one-time task, remove the integration from the app’s connected-services page and invalidate any issued token.
- Review delegated access after an agent update; a vendor may add tools or request broader scopes in a later version.
NIST’s February 5, 2026 concept paper on software-agent identity and authority treats identity, authorization, auditing, and non-repudiation as central questions because agents may reach diverse data, tools, and applications. The paper’s public-comment period has passed, while the associated project work can change; consult the NIST announcement for the dated context rather than treating it as a finished consumer standard.
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Tool permissions should be narrower than the agent’s general intelligence. An agent that can read a file does not need a shell. An agent that can draft an email does not need the ability to send it. An agent that can inspect a database does not need a production delete command.
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Build an allowlist
Enable only the tools required by the current workflow. For file tools, allow specific paths and operations. For APIs, allow specific endpoints, methods, records, and fields. For browsers, use a dedicated profile and limit navigation to known domains when the product supports it. Remove unused tools rather than relying on the model to ignore them.
Add approval gates
Require a human confirmation immediately before sending external messages, publishing content, moving money, changing permissions, deleting records, installing software, or running commands with broad effects. The approval screen should show the exact target, arguments, files, recipients, and resulting change—not merely a generic “allow tool” button.
Validate arguments outside the model
Enforce path restrictions, file-size limits, query allowlists, rate limits, destination checks, and schema validation in the tool or gateway. A prompt that says “never delete” cannot reliably substitute for a tool that has no delete operation. Use dry-run or preview modes for migrations, bulk edits, and message batches.
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When an agent can execute code, install packages, open files, or browse untrusted material, place it in a separate environment with only explicitly required resources. A container, virtual machine, restricted runtime, or hosted workspace can reduce the blast radius, but its strength depends on its configuration and the host.
NIST’s CSRC glossary defines a sandbox as “A restricted, controlled execution environment that prevents potentially malicious software, such as mobile code, from accessing any system resources except those for which the software is authorized.” The definition is attributed there to CNSSI 4009-2022. See the NIST sandbox glossary entry.
Configure the boundary
- Mount only the dedicated working directory, preferably as read-only input plus a separate writable output directory.
- Block access to host credentials, metadata services, device files, operating-system sockets, and unrelated mounts.
- Permit only the network destinations and ports required for the task; disable network access entirely when it is unnecessary.
- Run with a non-administrator identity, resource limits, timeouts, and a disposable environment that can be destroyed after completion.
- Keep secrets outside the sandbox and inject narrowly scoped, short-lived credentials only at the step that needs them.
Isolation is not a guarantee that every risk disappears. Misconfigured mounts, excessive network egress, vulnerable runtimes, shared kernels, or an overly powerful host account can defeat the intended boundary. Test what the agent can actually list, read, connect to, and execute before trusting the setup with sensitive material.
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Treat web pages, emails, and files as untrusted input
Indirect prompt injection occurs when content an agent reads contains instructions intended to redirect its behavior. A web page might tell the agent to upload local files; an email might request a password reset; a document might disguise commands as ordinary text. The content should not gain authority merely because the agent encountered it.
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NIST’s January 12, 2026 CAISI request for information on securing AI agent systems calls out adversarial data, including indirect prompt injection, and asks about interventions that constrain and monitor agent access. The practical response is to keep tool authority independent from document content.
Use a safer processing pattern
- Label external pages, attachments, and retrieved text as untrusted data in the workflow.
- Tell the agent to extract facts or draft a response, not to obey instructions found inside the material.
- Keep secrets, system prompts, and privileged tool descriptions out of the untrusted context when feasible.
- Require explicit approval before any action proposed by content changes external state.
- Log the source that triggered the action and inspect unusual requests for uploads, credential use, or privilege changes.
Do not assume that filtering a few phrases solves prompt injection. The durable control is limiting what the agent can do even when its input is hostile.
Review activity and revoke access
Access governance is incomplete without visibility. Check the agent’s run history, tool calls, file reads and writes, network destinations, approvals, errors, and account sign-ins. Compare activity with the task you assigned. Unexpected access to a sensitive folder, a new domain, or a high-impact tool is a reason to pause the run and investigate.
NIST guidance for software designated as critical under Executive Order 14028 discusses fine-grained access control, logging, and continuous monitoring. Its EO-critical software FAQ has that defined scope; use the controls as a useful governance model, not as a universal consumer-agent checklist.
End-of-task checklist
- Confirm which files, records, and applications were actually accessed.
- Review generated changes and reject anything outside the requested scope.
- Delete temporary copies and outputs that contain unnecessary personal data.
- Disconnect integrations, revoke tokens, unmount workspaces, and shut down temporary runtimes that are no longer needed.
- Record the remaining grants, their owners, expiration dates, and the next review date.
A platform-neutral setup procedure
Use this sequence whenever you deploy a new agent or assign it a new class of work. Product labels differ, but the decisions are portable.
- Write the task boundary. State the exact inputs, outputs, systems, recipients, and actions required. Mark anything explicitly out of scope.
- Inventory current authority. Inspect files, folders, connected apps, identities, tools, browser sessions, code execution, network access, and stored credentials.
- Create a dedicated workspace. Copy or sanitize only the necessary data. Keep personal and production data outside it.
- Select the lowest operation level. Start read-only. Add constrained creation or editing only when the task cannot be completed otherwise.
- Narrow the identity and scope. Use a separate account or project role, specific paths and records, short-lived tokens, and no administrator rights.
- Isolate execution. Use a sandbox or disposable environment for code and untrusted automation, with restricted mounts and network access.
- Gate high-impact actions. Turn on previews, dry runs, rate limits, and human approval for sending, deleting, purchasing, publishing, permission changes, and production writes.
- Run a small test. Give the agent harmless sample data and verify that denied paths, tools, commands, and destinations really fail.
- Monitor the live run. Watch logs and stop the agent if it requests unrelated data, secrets, or a broader scope.
- Revoke and document. Remove temporary grants, invalidate credentials, clean up copies, and record what remains enabled.
Common failure modes and fixes
“I shared one folder, but the agent can see everything.”
The integration may use an account-wide search or synchronization permission. Revoke that grant, create a separate account or project, and use a resource-specific connector. Check indexes, mounted drives, and browser profiles as well as the visible folder picker.
“The agent is read-only, but it still caused a change.”
Read-only may apply to one tool while another connected tool can write. Audit every tool and account, including browser automation and generic API clients. Remove write-capable tools and test with a deliberately harmless target.
“The sandbox can still reach private services.”
Inspect outbound routes, DNS, proxy settings, host networking, mounted sockets, and inherited credentials. Replace broad network access with an allowlist or disable networking for offline tasks.
“Approval prompts are too frequent, so people approve them blindly.”
Reduce the agent’s task scope, batch low-risk read operations, and reserve approval for clearly consequential actions. Make each prompt show the exact operation and target. Frequent unexplained prompts are a design signal, not a reason to grant permanent write access.
“A connected app added new permissions after an update.”
Review the app’s current scopes and recent consent events, then revoke and reconnect with the smallest available role. Treat integration changes as a new security review.
How to choose the right boundary
| Situation | Recommended boundary | Why |
|---|---|---|
| Summarizing a few private documents | Sanitized copies in a dedicated folder; read-only file access; no browser or shell | The agent needs content, not the ability to change files or reach other accounts |
| Drafting messages from a mailbox | Read-only mailbox search; drafts in a separate folder; human approval before sending | Draft creation and sending have different consequences |
| Updating a test dataset | Separate test identity; constrained writes to approved tables and fields; transaction rollback | Errors stay out of production while preserving useful automation |
| Running code generated from the web | Disposable sandbox; minimal files; restricted or disabled network; time and resource limits | External content is untrusted and code may attempt unrelated access |
| Production automation | Dedicated service identity, explicit API allowlist, approval for destructive actions, continuous logging | Write authority is necessary but must remain attributable and reversible |
For any agent, ask five questions before enabling it: Which exact resources can it reach? Which operations can it perform? In what environment will it run? Which actions are automatic versus approved and logged? How quickly can you review and revoke the access? If any answer is unclear, narrow the deployment or postpone connecting sensitive data.
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