Remove a reaction from a Liveblocks comment
AI agents call remove-comment-reaction to permanently remove resources in Liveblocks — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
The tool explicitly removes a reaction from a comment. Like other delete/remove operations, this is a destructive action that cannot be undone without re-adding the reaction manually. Severity is medium since it only affects a small piece of metadata (a reaction) rather than entire comments or rooms.
From the tool's definition 'Remove a reaction from a Liveblocks comment' — removing a reaction is an irreversible deletion of user-generated data (the reaction emoji/response attached to a comment).
Documented attack patterns abuse exactly the kind of access remove-comment-reaction gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Liveblocks, and nothing reaches the server without passing your rules. This is the rule we recommend for remove-comment-reaction:
{
"version": "1",
"default": "deny",
"hide": [
"remove-comment-reaction"
]
}remove-comment-reaction disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.
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Remove a reaction from a Liveblocks comment. It is categorised as a Destructive tool in the Liveblocks MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Liveblocks MCP server in PolicyLayer and add a rule for remove-comment-reaction: 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 Liveblocks. Nothing to install.
remove-comment-reaction 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 remove-comment-reaction 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 remove-comment-reaction. 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.
remove-comment-reaction is provided by the Liveblocks MCP server (liveblocks/liveblocks-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Liveblocks, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
39 Liveblocks tools catalogued and risk-classified — across an index of 43,000+ MCP servers.