Get annual and quarterly balance sheets for a symbol (e.g., "AAPL"). Returns total assets, liabilities, equity, cash, and debt.
Part of the Alphavantage server.
Free to start. No card required.
AI agents call av_balance_sheet to retrieve information from Alphavantage without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though av_balance_sheet only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"av_balance_sheet": {}
}
}See the full Alphavantage policy for all 26 tools.
These attack patterns abuse exactly the kind of access av_balance_sheet gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Get annual and quarterly balance sheets for a symbol (e.g., "AAPL"). Returns total assets, liabilities, equity, cash, and debt.. It is categorised as a Read tool in the Alphavantage MCP Server, which means it retrieves data without modifying state.
Register the Alphavantage MCP server in PolicyLayer and add a rule for av_balance_sheet: 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 Alphavantage. Nothing to install.
av_balance_sheet 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 av_balance_sheet 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 av_balance_sheet. 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.
av_balance_sheet is provided by the Alphavantage MCP server (https://gateway.pipeworx.io/alphavantage/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 26 Alphavantage tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.