The Tool Desk
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What Harness permissions control
DeepSeek describes Harness as a locally-first, extensible coding agent and agent development/runtime environment. Models, tools, skills, sessions, sandboxes, storage, loops, scheduling, and the UI are treated as capabilities that can be selected or extended through configuration. In its Web UI, the agent can read and edit workspace files, run commands, delegate work, and maintain a plan, so permissions can affect access to files and commands—not just how the agent responds. See DeepSeek’s product preview and Web UI quickstart.
Choose a starting level for the task
Use the interface labels as a starting point, then verify the behavior in the version and configuration you are running. The Web UI documents Read Only, Workspace Write, and Full access. The permission reference documents specific preset mappings, but do not assume every client exposes every preset or uses identical labels.
| Task | Starting point | What to verify |
|---|---|---|
| Inspect or summarize files without changing them | Read Only | Check what the configured tools can still read or access; the label alone does not establish every tool’s reach. |
| Make changes within a project | Workspace Write | Verify the workspace boundary and keep approval prompts active where possible. |
| Operate broadly outside the workspace | Avoid as a default; consider Full access only for a deliberate, isolated task | Understand the wider sandbox and approval behavior, acknowledge the risk, and use a disposable environment. |
| Allow experimental automated review | Auto review only when explicitly configured and understood | The UI reference calls Auto experimental; visible selection requires separate risk acknowledgement, and availability depends on the integration. |
Understand sandbox mode and approval policy
A permission preset can combine two separate controls. Sandbox mode limits the environment’s reach; approval policy determines whether an operation needs a human approval. The permission subsystem’s documented defaults pair workspace-write sandbox with ask approval, and danger-full-access sandbox with never approval. Those mappings explain why a permission label should not be treated as a complete description of risk: check both dimensions in the active configuration. Consult the permission subsystem reference and Web UI reference.
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The Web UI lists Read Only as a visible choice, but the cited preset table does not establish a universal mapping for that label. Preset names, mappings, and available choices can depend on the installed version and composition.
Change the default or the active session
These controls have different effects: General settings sets a default for future sessions, while the composer permission control and /permission picker change the current session.
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- To set the default for future sessions, open Web UI General settings and change the permission row. This does not switch or rewrite the active session.
- To change the active session, use the permission control in the composer or enter
/permissionand choose a level. - After changing the active session, confirm its current permission value in the session UI.
- If selecting Full access or Auto review, complete the risk acknowledgement when prompted. Auto is experimental, current-session-only, and available only when the integration is loaded.
Review tools and plugins, not just the preset
Harness capabilities are presented as plugins, so inspect what is actually mounted in the active composition. Pay particular attention to shell or command execution, filesystem access, network-connected tools, external model endpoints, MCP services, and third-party plugins. A preset cannot tell you the full practical reach of tools and services you have configured.
DeepSeek’s Terms of Use warn that the product can execute generated code and commands, load third-party plugins, and access networks, processes, credentials, and files made available to it. Review proposed commands and tools before use, and install only trusted, reviewed plugins and dependencies.
Reduce the risk that permissions cannot remove
DeepSeek’s official Harness safety document describes the software as an experimental developer preview that has not undergone a security audit. It warns: “Sandboxing, approval prompts, and permission controls can reduce risk, but they do not guarantee isolation or prevent damage.” Restrictions cannot protect resources the project is permitted to access.
- Run untrusted or high-impact work in a disposable VM, container, or dedicated environment.
- Keep backups of files the environment can reach.
- Do not expose sensitive credentials unless you accept the risk.
- Review plugins, configuration, and proposed commands before allowing them to run.
- For significant changes, retain human confirmation rather than relying on automated approval.
Use this decision check before starting
- What files and commands does the task actually require?
- Is access confined to the workspace, or can configured tools reach beyond it?
- Which operations require approval, and which can run without a prompt?
- Is this setting for the active session or only future sessions?
- Are the environment, credentials, and reachable files safe if the agent makes a mistake?
Harness remains developer-preview software, so confirm preset names, mappings, acknowledgement behavior, Auto availability, and session/default semantics against the installed release. This guidance reflects official documentation current as of October 4, 2026.
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