canvas_list_folders

List folders in a course

SERVERCowork Bench SOURCE0717376/cowork_bench

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/cowork-bench/canvas-list-folders.md

WHAT IT DOES

What canvas_list_folders does on Cowork Bench

AI agents call canvas_list_folders to retrieve information from Cowork Bench without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why canvas_list_folders is rated Low

This is a straightforward read operation that queries course folder structure. It retrieves information with no side effects, no data modification, and no irreversible actions. The low severity reflects minimal blast radius even if misused by an agent—it only exposes folder metadata/structure within a course.

From the tool's definition The tool name 'canvas_list_folders' and description 'List folders in a course' indicate a query operation that retrieves and displays folder information without modifying any data.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs canvas_list_folders safely

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

canvas_list_folders Allowed

canvas_list_folders is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "canvas_list_folders": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about canvas_list_folders

What does the canvas_list_folders tool do? +

List folders in a course. It is categorised as a Read tool in the Cowork Bench MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on canvas_list_folders? +

Register the Cowork Bench MCP server in PolicyLayer and add a rule for canvas_list_folders: 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 Cowork Bench. Nothing to install.

What risk level is canvas_list_folders? +

canvas_list_folders is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit canvas_list_folders? +

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

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

canvas_list_folders is provided by the Cowork Bench MCP server (0717376/cowork_bench). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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