write_workspace_file

Create or update a file in the agent workspace (~/.nodebench/workspace/).

SERVERNodebench SOURCEnodebench-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/io-github-homenshum-nodebench/write-workspace-file.md

WHAT IT DOES

What write_workspace_file does on Nodebench

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

RISK

Why write_workspace_file is rated Medium

This tool creates or modifies files in a local workspace directory. It is reversible (files can be edited or deleted), so it does not qualify as Destructive. It performs data modification without executing arbitrary code or triggering external operations, so it is Write rather than Execute.

From the tool's definition Tool description explicitly states 'Create or update a file' which are write operations. The workspace path (~/.nodebench/workspace/) indicates local filesystem modification.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs write_workspace_file safely

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

write_workspace_file Rate-limited

write_workspace_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_workspace_file": {
      "limits": [
        {
          "counter": "write_workspace_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 Nodebench, apply this rule, and every write_workspace_file call is checked against it from then on.

FAQ

Questions about write_workspace_file

What does the write_workspace_file tool do? +

Create or update a file in the agent workspace (~/.nodebench/workspace/). It is categorised as a Write tool in the Nodebench 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_workspace_file? +

Register the Nodebench MCP server in PolicyLayer and add a rule for write_workspace_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 Nodebench. Nothing to install.

What risk level is write_workspace_file? +

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

Can I rate-limit write_workspace_file? +

Yes. Add a rate_limit block to the write_workspace_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_workspace_file completely? +

Set action: deny in the PolicyLayer policy for write_workspace_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_workspace_file? +

write_workspace_file is provided by the Nodebench MCP server (nodebench-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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