block_explode

THE RISK

Critical Risk

Why block_explode needs a policy

In AutoCAD, 'explode' is a well-known destructive operation that irreversibly decomposes a block reference (or other compound entity) into its constituent primitives, destroying the original block instance and losing block-level attributes and associations. This operation cannot be undone in an automated/headless context. The name strongly implies this standard CAD behavior.

From the tool's definition Tool name 'block_explode' on an AutoCAD automation server; description is empty.

Documented attack patterns abuse exactly the kind of access block_explode gives an agent:

POLICY

How to control block_explode

PolicyLayer is an MCP gateway — it sits between your AI agents and AutoCAD MCP Pro, and nothing reaches the server without passing your rules. This is the rule we recommend for block_explode:

policy.json

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

block_explode disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.

Create a free account and register AutoCAD MCP Pro — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RESTRICT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More AutoCAD MCP Pro tools

Destructive construction_clear Delete every entity on the CONSTRUCTION layer. Idempotent. Destructive drawing_purge Purge all unused objects (layers, blocks, linetypes, styles) from the drawing. Destructive entity_delete Permanently delete an entity by its handle. Destructive entity_delete_many Delete multiple entities in one call. Returns count of deleted entities. Destructive layer_delete layer_delete Execute drawing_audit Run an integrity audit on the drawing to detect and fix errors. Execute system_run_command system_run_command Execute system_run_lisp system_run_lisp

All 108 AutoCAD MCP Pro tools →

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Go deeper

Critical-risk tools in AutoCAD MCP Pro → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Blast radius → How much damage one compromised or confused agent can do — and how to bound it.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about block_explode

What does the block_explode tool do? +

block_explode. It is categorised as a Destructive tool in the AutoCAD MCP Pro 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 block_explode? +

Register the AutoCAD MCP Pro MCP server in PolicyLayer and add a rule for block_explode: 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 AutoCAD MCP Pro. Nothing to install.

What risk level is block_explode? +

block_explode 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 block_explode? +

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

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

block_explode is provided by the AutoCAD MCP Pro MCP server (u-c4n/autocad-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every AutoCAD MCP Pro tool call.

Start from AutoCAD MCP Pro, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →