AI agents call get_institutional_holders to retrieve information from IsoFinancial-MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves information about institutional investors holding stakes in securities—a read-only operation with no side effects, no code execution, no data modification, and no financial transactions. The public nature of institutional holding data and the passive retrieval mechanism classify it as Read category with low severity.
From the tool's definition Tool name 'get_institutional_holders' and description 'Get institutional investors' indicate data retrieval with no modification, deletion, or execution of external operations. This is a query function that retrieves publicly available financial market data.
Documented attack patterns abuse exactly the kind of access get_institutional_holders gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and IsoFinancial-MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for get_institutional_holders:
{
"version": "1",
"default": "deny",
"tools": {
"get_institutional_holders": {}
}
}get_institutional_holders is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get institutional investors. It is categorised as a Read tool in the IsoFinancial-MCP MCP Server, which means it retrieves data without modifying state.
Register the IsoFinancial- MCP server in PolicyLayer and add a rule for get_institutional_holders: 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 IsoFinancial-MCP. Nothing to install.
get_institutional_holders 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 get_institutional_holders 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 get_institutional_holders. 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.
get_institutional_holders is provided by the IsoFinancial- MCP server (niels-8/isofinancial-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from IsoFinancial-MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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26 IsoFinancial-MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.