write_file_base64

Write binary content from base64 to a remote file.

SERVERMcp Control Plane SOURCEalbertik322-sudo/mcp-control-plane

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/mcp-control-plane/write-file-base64.md

WHAT IT DOES

What write_file_base64 does on Mcp Control Plane

AI agents use write_file_base64 to create or update resources in Mcp Control Plane, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp Control Plane environment.

RISK

Why write_file_base64 is rated Medium

This tool creates or modifies files on remote systems, which is a Write operation. Severity is high because writing arbitrary binary content to remote files in a control plane context could overwrite critical configurations, executables, or scripts, potentially compromising system integrity. It is not Destructive because the operation is reversible (files can be overwritten or deleted).

From the tool's definition Tool name 'write_file_base64' and description 'Write binary content from base64 to a remote file' explicitly indicate file creation/modification capability on remote systems.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs write_file_base64 safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Mcp Control Plane, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For write_file_base64, this is the rule to start with:

write_file_base64 Rate-limited

write_file_base64 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": {
    "write_file_base64": {
      "limits": [
        {
          "counter": "write_file_base64_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 Mcp Control Plane, apply this rule, and every write_file_base64 call is checked against it from then on.

FAQ

Questions about write_file_base64

What does the write_file_base64 tool do? +

Write binary content from base64 to a remote file. It is categorised as a Write tool in the Mcp Control Plane MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on write_file_base64? +

Register the Mcp Control Plane MCP server in PolicyLayer and add a rule for write_file_base64: 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 Mcp Control Plane. Nothing to install.

What risk level is write_file_base64? +

write_file_base64 is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit write_file_base64? +

Yes. Add a rate_limit block to the write_file_base64 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 write_file_base64 completely? +

Set action: deny in the PolicyLayer policy for write_file_base64. 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 write_file_base64? +

write_file_base64 is provided by the Mcp Control Plane MCP server (albertik322-sudo/mcp-control-plane). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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