This record as markdown: /tools/dutydeck/canvas-cancel-media-run.md
What canvas_cancel_media_run does on DutyDeck
AI agents call canvas_cancel_media_run to permanently remove resources in DutyDeck, typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Why canvas_cancel_media_run is rated Critical
An AI agent that decides to call canvas_cancel_media_run doesn't hesitate, doesn't double-check, and doesn't stop at one. Whatever it removes from DutyDeck is gone. There is no undo for destructive operations.
Attacks that exploit this kind of access
The rule that runs canvas_cancel_media_run 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_cancel_media_run, this is the rule to start with:
canvas_cancel_media_run is removed from the agent's tool list entirely, so the agent never calls it. The rest of the server keeps working.
The button opens the PolicyLayer dashboard: create your workspace, connect DutyDeck, apply this rule, and every canvas_cancel_media_run call is checked against it from then on.
Questions about canvas_cancel_media_run
取消确切音频或视频节点拥有的运行；必须显式声明取消意图。. It is categorised as a Destructive tool in the DutyDeck MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the DutyDeck MCP server in PolicyLayer and add a rule for canvas_cancel_media_run: 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.
canvas_cancel_media_run is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the canvas_cancel_media_run 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.
Set action: deny in the PolicyLayer policy for canvas_cancel_media_run. 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.
canvas_cancel_media_run 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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