AI agents use assign_group_id to create or update resources in BNB Chain MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your BNB Chain MCP environment.
This tool creates or modifies transaction groupings, which is a reversible data modification. It does not irreversibly delete data (not Destructive), does not execute arbitrary code (not Execute), and does not directly transfer funds (not Financial).
From the tool's definition Tool name 'assign_group_id' indicates modification of transaction metadata. Description states 'Assign a group ID to a list of transactions,' which is a state-changing operation that groups/organizes transactions.
Documented attack patterns abuse exactly the kind of access assign_group_id gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and BNB Chain MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for assign_group_id:
{
"version": "1",
"default": "deny",
"tools": {
"assign_group_id": {
"limits": [
{
"counter": "assign_group_id_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}assign_group_id stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Assign a group ID to a list of transactions. It is categorised as a Write tool in the BNB Chain MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the BNB Chain MCP server in PolicyLayer and add a rule for assign_group_id: 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 BNB Chain MCP. Nothing to install.
assign_group_id is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the assign_group_id 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 assign_group_id. 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.
assign_group_id is provided by the BNB Chain MCP server (nirholas/bnbchain-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 1240 BNB Chain MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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1240 BNB Chain MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.