write_file
Write or overwrite a file in the s&box project (SILENTLY replaces existing content — read_file first if you need to preserve it). Creates parent directories as needed; paths are confined to the project root (traversal outside it is denied). Returns a confirmation with the path — for C# follow wit...
This record as markdown: /tools/sbox/write-file.md
What write_file does on Sbox
AI agents use write_file to create or update resources in Sbox, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Sbox environment.
Why write_file is rated Medium
Modifies project files reversibly; high severity due to silent overwrites and code injection risk in game development context.
From the tool's definition Write or overwrite a file, silently replaces existing content, creates parent directories
Risk signalsAdmin/system-level operation
Attacks that exploit this kind of access
The rule that runs write_file safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Sbox, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For write_file, this is the rule to start with:
write_file stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Sbox, apply this rule, and every write_file call is checked against it from then on.
Questions about write_file
Write or overwrite a file in the s&box project (SILENTLY replaces existing content — read_file first if you need to preserve it). Creates parent directories as needed; paths are confined to the project root (traversal outside it is denied). Returns a confirmation with the path — for C# follow with trigger_hotload so it compiles; for assets (.vmat etc.) follow with recompile_asset. It is categorised as a Write tool in the Sbox MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Sbox MCP server in PolicyLayer and add a rule for write_file: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Sbox. Nothing to install.
write_file is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the write_file rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for write_file. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
write_file is provided by the Sbox MCP server (sbox-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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