AI agents call decode_obj to retrieve information from BNB Chain MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs data deserialization/decoding only. It retrieves and transforms existing data into a readable format without creating, modifying, deleting, or executing external operations. This is a safe read operation with minimal blast radius if misused, as it cannot alter state or trigger external effects.
From the tool's definition Tool decodes msgpack bytes to an object - a read/retrieval operation with no side effects. The description explicitly indicates it performs decoding (transformation of data format) without modification or deletion.
Documented attack patterns abuse exactly the kind of access decode_obj 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 decode_obj:
{
"version": "1",
"default": "deny",
"tools": {
"decode_obj": {}
}
}decode_obj is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Decode msgpack bytes to an object. It is categorised as a Read tool in the BNB Chain MCP MCP Server, which means it retrieves data without modifying state.
Register the BNB Chain MCP server in PolicyLayer and add a rule for decode_obj: 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.
decode_obj is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the decode_obj 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 decode_obj. 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.
decode_obj 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.