This record as markdown: /tools/cowork-bench/canvas-delete-announcement.md
What canvas_delete_announcement does on Cowork Bench
AI agents call canvas_delete_announcement to permanently remove resources in Cowork Bench, typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Why canvas_delete_announcement is rated Critical
An AI agent that decides to call canvas_delete_announcement doesn't hesitate, doesn't double-check, and doesn't stop at one. Whatever it removes from Cowork Bench is gone. There is no undo for destructive operations.
Attacks that exploit this kind of access
The rule that runs canvas_delete_announcement 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_delete_announcement, this is the rule to start with:
canvas_delete_announcement 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 Cowork Bench, apply this rule, and every canvas_delete_announcement call is checked against it from then on.
Questions about canvas_delete_announcement
Delete an announcement. It is categorised as a Destructive tool in the Cowork Bench MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Cowork Bench MCP server in PolicyLayer and add a rule for canvas_delete_announcement: 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.
canvas_delete_announcement 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_delete_announcement 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_delete_announcement. 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_delete_announcement 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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