write_binary_file

A write tool on the Allcanuse MCP server.

SERVERAllcanuse SOURCEra1nyxin/allcanuse-mcp

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/ra1nyxin-allcanuse-mcp/write-binary-file.md

WHAT IT DOES

What write_binary_file does on Allcanuse

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

RISK

Why write_binary_file is rated Medium

The tool performs a Write operation—creating or modifying binary files, which is reversible. However, severity is elevated to 'high' because writing arbitrary binary files to a system could enable code injection (e.g., overwriting executables, libraries, or configuration files), posing significant risk if an AI agent misuses it.

From the tool's definition Tool name 'write_binary_file' indicates creation or modification of binary files on the local filesystem. Description is empty, limiting direct evidence, but the name is explicit about write operations.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs write_binary_file safely

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

write_binary_file Rate-limited

write_binary_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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "write_binary_file": {
      "limits": [
        {
          "counter": "write_binary_file_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 Allcanuse, apply this rule, and every write_binary_file call is checked against it from then on.

FAQ

Questions about write_binary_file

What does the write_binary_file tool do? +

write_binary_file is a write tool on the Allcanuse MCP server. It is categorised as a Write tool in the Allcanuse 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_binary_file? +

Register the Allcanuse MCP server in PolicyLayer and add a rule for write_binary_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 Allcanuse. Nothing to install.

What risk level is write_binary_file? +

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

Can I rate-limit write_binary_file? +

Yes. Add a rate_limit block to the write_binary_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.

How do I block write_binary_file completely? +

Set action: deny in the PolicyLayer policy for write_binary_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.

What MCP server provides write_binary_file? +

write_binary_file is provided by the Allcanuse MCP server (ra1nyxin/allcanuse-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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