AI agents use rename_symbol to create or update resources in Binaryninja — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Binaryninja environment.
The rename_symbol tool creates or modifies data (symbol names) in a reversible manner. It does not delete data (not Destructive), does not execute external code (not Execute), and does not move money (not Financial). While renaming symbols in a Binary Ninja project could cause confusion if done maliciously to obfuscate analysis work, the primary concern is that it modifies the working analysis state.
From the tool's definition Tool description states 'Rename a function or a data variable' - this modifies existing symbols in a binary analysis project by changing their names, which is a reversible write operation.
Documented attack patterns abuse exactly the kind of access rename_symbol gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Binaryninja, and nothing reaches the server without passing your rules. This is the rule we recommend for rename_symbol:
{
"version": "1",
"default": "deny",
"tools": {
"rename_symbol": {
"limits": [
{
"counter": "rename_symbol_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}rename_symbol 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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Rename a function or a data variable. It is categorised as a Write tool in the Binaryninja MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Binaryninja MCP server in PolicyLayer and add a rule for rename_symbol: 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 Binaryninja. Nothing to install.
rename_symbol 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 rename_symbol 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 rename_symbol. 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.
rename_symbol is provided by the Binaryninja MCP server (mcpphalanx/binaryninja-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Binaryninja, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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16 Binaryninja tools catalogued and risk-classified — across an index of 43,000+ MCP servers.