canvas_prepare_image_attachment

把统一媒体生成或已登记图片绑定到现有图片卡并冻结配置、真实请求和输入版本；不会创建新卡、执行模型或自动采用。生成应先准备再执行，完成后用 canvas_attach_image_result。

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-prepare-image-attachment.md

WHAT IT DOES

What canvas_prepare_image_attachment does on DutyDeck

AI agents call canvas_prepare_image_attachment 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_prepare_image_attachment is rated Low

Even though canvas_prepare_image_attachment 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_prepare_image_attachment 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_prepare_image_attachment, this is the rule to start with:

canvas_prepare_image_attachment Allowed

canvas_prepare_image_attachment 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_prepare_image_attachment": {}
  }
}

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_prepare_image_attachment call is checked against it from then on.

FAQ

Questions about canvas_prepare_image_attachment

What does the canvas_prepare_image_attachment tool do? +

把统一媒体生成或已登记图片绑定到现有图片卡并冻结配置、真实请求和输入版本；不会创建新卡、执行模型或自动采用。生成应先准备再执行，完成后用 canvas_attach_image_result。. 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_prepare_image_attachment? +

Register the DutyDeck MCP server in PolicyLayer and add a rule for canvas_prepare_image_attachment: 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_prepare_image_attachment? +

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

Can I rate-limit canvas_prepare_image_attachment? +

Yes. Add a rate_limit block to the canvas_prepare_image_attachment 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_prepare_image_attachment completely? +

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

canvas_prepare_image_attachment 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.

KEEP EXPLORING

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