canvas_list_nodes

分页枚举当前会话已关联画布的权威节点摘要；可按节点类型过滤，expectedRevision 固定审核基线。局部失败返回 readError，不代表内容错误；不返回素材 ID、媒体 URL 或本地路径。

SERVERDutyDeck SOURCEtaokoplay/DutyDeck

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/dutydeck/canvas-list-nodes.md

WHAT IT DOES

What canvas_list_nodes does on DutyDeck

AI agents call canvas_list_nodes to retrieve information from DutyDeck 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_nodes is rated Low

Even though canvas_list_nodes only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs canvas_list_nodes safely

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

canvas_list_nodes Allowed

canvas_list_nodes 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_nodes": {}
  }
}

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

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

FAQ

Questions about canvas_list_nodes

What does the canvas_list_nodes tool do? +

分页枚举当前会话已关联画布的权威节点摘要；可按节点类型过滤，expectedRevision 固定审核基线。局部失败返回 readError，不代表内容错误；不返回素材 ID、媒体 URL 或本地路径。. It is categorised as a Read tool in the DutyDeck MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on canvas_list_nodes? +

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

What risk level is canvas_list_nodes? +

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

Can I rate-limit canvas_list_nodes? +

Yes. Add a rate_limit block to the canvas_list_nodes 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_nodes completely? +

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

canvas_list_nodes is provided by the DutyDeck MCP server (taokoplay/DutyDeck). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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