canvases_delete

Delete a canvas.

SERVERSlack SOURCEkarbassi/slack-mcp

Critical RISK CLASS

Category Destructive

Parameters 00 required

Recommended Hiddensee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/karbassi-slack-mcp/canvases-delete.md

WHAT IT DOES

What canvases_delete does on Slack

AI agents call canvases_delete to permanently remove resources in Slack, typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.

RISK

Why canvases_delete is rated Critical

This tool irreversibly deletes canvas data, which cannot be undone. Canvases in Slack can contain important collaborative work, documentation, and team knowledge. An AI agent with access to this tool could cause data loss if it misidentifies or targets the wrong canvas.

From the tool's definition Tool name 'canvases_delete' and description 'Delete a canvas' indicate irreversible deletion of data. The Slack API documentation confirms canvases.delete permanently removes canvas content.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs canvases_delete safely

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

canvases_delete Hidden

canvases_delete is removed from the agent's tool list entirely, so the agent never calls it. The rest of the server keeps working.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "canvases_delete"
  ]
}

RESTRICT THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about canvases_delete

What does the canvases_delete tool do? +

Delete a canvas. It is categorised as a Destructive tool in the Slack MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on canvases_delete? +

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

What risk level is canvases_delete? +

canvases_delete is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit canvases_delete? +

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

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

canvases_delete is provided by the Slack MCP server (karbassi/slack-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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