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Give an AI coding agent access only to the files, tools, commands, network destinations and credentials required for its task—and only for as long as the task requires. Run it in an isolated workspace without production secrets, and require independent review for security-sensitive code and high-impact actions. A permission prompt is useful, but isolation helps contain damage if the agent is manipulated.
Why an AI coding agent’s permissions matter
A coding agent may read repository files and external content, edit code, run commands, call APIs or use MCP tools. If it acts with your own permissions, malicious or misleading instructions in an issue, dependency file, web page or tool response can lead to consequences beyond a bad code suggestion.
OWASP describes excessive agency in three forms: excessive functionality, excessive permissions and excessive autonomy. An agent might have a delete operation it does not need, a broadly privileged identity, or authority to take a consequential action without approval. The OWASP DevSecOps Guideline puts the principle this way: “The guiding principle is least agency: give an agent only the autonomy, tools, and access its task requires, for only as long as it needs them.” OWASP DevSecOps Guideline: IDE and AI-Assisted Development Security; OWASP LLM06:2025, Excessive Agency; OWASP DevSecOps Guideline: AI Agent and MCP Security.
Set a task boundary before enabling access
Decide what the agent must do before configuring permissions. For a small bug fix, that could mean reading a few source directories, editing those files, running a named test command and consulting one necessary documentation endpoint. Do not grant broad access simply because the agent might find it convenient.
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- Allow reads and writes only in the relevant repository paths; deny secret-bearing files, SSH keys, cloud configuration and unrelated home-directory content.
- Allow only the commands needed for the task. Avoid unrestricted shell access when a narrower command or tool will do.
- Disable network access if the task does not need it. Otherwise, restrict outbound connections to required destinations.
- Keep pushing, deployment, out-of-workspace writes and other externally visible or high-impact actions behind approval.
Permission syntax and enforcement differ between products. Use the vendor’s current documentation for configuration, and test the boundary in a non-production workspace rather than assuming a setting covers every access path. OWASP recommends explicit allow rules and least-agency controls. OWASP DevSecOps Guideline: AI Agent and MCP Security
Use isolation and scoped credentials together
Run the agent in a dev container, restricted shell, disposable virtual machine or ephemeral workspace. Avoid unnecessary mounts from your home directory, and keep production credentials out of the environment. Isolation is a containment boundary: it matters if an agent encounters an injected instruction or otherwise behaves unexpectedly.
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When credentials are necessary, use a separate agent identity and a short-lived token scoped to the task. Separate read-only access from write-capable access where possible, and make the identity revocable without changing your personal account. Limit network egress to the destinations the task requires. A prompt asking permission is a checkpoint, not a substitute for these boundaries.
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Treat repository content and tools as untrusted input
Prompt injection can arrive through ordinary work materials, not only through a direct chat message. Treat issue text, pull requests, web pages, dependency files, MCP server descriptions and tool responses as untrusted. An agent with broad command or network access may act on embedded instructions, so limit what it can reach and what it can do.
- Review and version-pin MCP servers and other tools. Inspect their requested permissions and changes to tool definitions.
- Keep persistent agent instruction files under normal code review. Inspect modifications for unexpected instructions or hidden Unicode.
- Log agent actions so reviewers can see what it read, changed and invoked.
- Review generated code through the normal process, with extra scrutiny for authentication, cryptography, CI and deployment configuration.
OWASP discusses prompt injection, tool abuse and oversight risks in its agent guidance. OWASP AI Agent Security Cheat Sheet; OWASP DevSecOps Guideline: IDE and AI-Assisted Development Security
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Keep approval gates for consequential actions
Require approval before commands or actions that cross the task boundary: accessing the network, writing outside the workspace, pushing changes, deploying, or affecting external systems. Keep those gates enabled by default. Skip-permission modes remove an important checkpoint and should be confined to isolated, throwaway environments where the consequences are contained.
Independently review security-sensitive changes and high-impact actions. The agent’s own explanation is not a substitute for reviewing the diff, test results and action log. OWASP recommends human oversight and runtime controls for agent activity. OWASP DevSecOps Guideline: AI Agent and MCP Security; OWASP Agent Control Standard
Check the real boundary, not just the settings screen
Before using an agent on sensitive work, verify what each control actually covers. A sandbox may constrain shell commands without constraining file tools or MCP servers; vendor controls differ. Test with a non-production repository and examine filesystem scope, command execution, network egress, credentials, tools, approval behavior and logs.
| Control to verify | Questions to answer |
|---|---|
| Filesystem | Which paths can the agent read or change? Are secrets and home-directory mounts excluded? |
| Commands | Are commands explicitly allowed, or can the agent run an open-ended shell? |
| Network | Can it connect only to necessary destinations? Can egress be disabled for offline tasks? |
| Credentials | Are the identity and token scoped, short-lived and independently revocable? |
| Tools and MCP | Are tools reviewed and version-pinned? Do their permissions and responses create other access paths? |
| Approvals and audit | Which sensitive actions require approval, and can you inspect a log of agent activity? |
These checks reflect the control areas identified by OWASP’s agent-control guidance. OWASP Agent Control Standard
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