roam_delete_block

THE RISK

Critical Risk

Why roam_delete_block needs a policy

This tool irreversibly removes data from the user's knowledge graph. While deletion of a single block may have limited blast radius compared to bulk deletion, it is still a destructive action that cannot be reversed programmatically. An AI agent with access could maliciously or mistakenly delete important content blocks.

From the tool's definition Tool name 'roam_delete_block' combined with description 'Delete a single block from the graph by its UID' explicitly performs irreversible deletion of data.

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

POLICY

How to control roam_delete_block

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

policy.json

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

roam_delete_block 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 Roam Research MCP Server — 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 Roam Research MCP Server tools

Destructive roam_delete_page Delete a page and all of its blocks from the graph by its UID. Execute roam_datomic_query Execute a custom Datomic query on the Roam graph beyond the available search tools. Write roam_add_todo Add a list of todo items as individual blocks to today's daily page in Roam. Write roam_create_block Add a new block to an existing Roam page. If no page specified, adds to today's daily note Write roam_create_outline roam_create_outline Write roam_create_page roam_create_page Write roam_import_markdown roam_import_markdown Write roam_remember Add a memory or piece of information to remember, stored on the daily page with tag.

All 26 Roam Research MCP Server tools →

Destructive tools on other servers

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Go deeper

Critical-risk tools in Roam Research MCP Server → 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 roam_delete_block

What does the roam_delete_block tool do? +

Delete a single block from the graph by its UID. It is categorised as a Destructive tool in the Roam Research MCP Server 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 roam_delete_block? +

Register the Roam Research MCP Server MCP server in PolicyLayer and add a rule for roam_delete_block: 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 Roam Research MCP Server. Nothing to install.

What risk level is roam_delete_block? +

roam_delete_block 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 roam_delete_block? +

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

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

roam_delete_block is provided by the Roam Research MCP Server MCP server (philosolares/roam-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Roam Research MCP Server tool call.

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

CHECK YOUR STACK →