sandbox_files_write

Write a file inside the sandbox. Creates parent dirs if needed. Use encoding=base64 for binary content.

SERVEREasyBits SOURCE@easybits.cloud/mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade D, identity unverified Pull the record →

This record as markdown: /tools/cloud-easybits-easybits/sandbox-files-write.md

WHAT IT DOES

What sandbox_files_write does on EasyBits

AI agents use sandbox_files_write to create or update resources in EasyBits, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your EasyBits environment.

RISK

Why sandbox_files_write is rated Medium

Modifies sandbox filesystem; high blast radius if agent writes malicious or critical files.

From the tool's definition Write a file inside the sandbox. Creates parent dirs if needed.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs sandbox_files_write safely

PolicyLayer is an MCP gateway: it sits between your AI agents and EasyBits, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For sandbox_files_write, this is the rule to start with:

sandbox_files_write Rate-limited

sandbox_files_write 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "sandbox_files_write": {
      "limits": [
        {
          "counter": "sandbox_files_write_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect EasyBits, apply this rule, and every sandbox_files_write call is checked against it from then on.

FAQ

Questions about sandbox_files_write

What does the sandbox_files_write tool do? +

Write a file inside the sandbox. Creates parent dirs if needed. Use encoding=base64 for binary content. It is categorised as a Write tool in the EasyBits MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on sandbox_files_write? +

Register the EasyBits MCP server in PolicyLayer and add a rule for sandbox_files_write: 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 EasyBits. Nothing to install.

What risk level is sandbox_files_write? +

sandbox_files_write is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit sandbox_files_write? +

Yes. Add a rate_limit block to the sandbox_files_write 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.

How do I block sandbox_files_write completely? +

Set action: deny in the PolicyLayer policy for sandbox_files_write. 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.

What MCP server provides sandbox_files_write? +

sandbox_files_write is provided by the EasyBits MCP server (@easybits.cloud/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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