list_sources · Financial Reports MCP Server MCP

WHAT IT DOES

What list_sources does on Financial Reports MCP Server

AI agents call list_sources to retrieve information from Financial Reports MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

THE RISK

Low Risk

Why list_sources needs a policy

This tool performs a read-only listing operation. It retrieves information about what data sources are available but does not create, modify, delete, or execute any operations. The action is purely informational with no side effects. Even in the context of a Financial Reports server, listing sources is a non-sensitive enumeration that carries minimal risk.

From the tool's definition Tool name 'list_sources' and description 'List all available data sources' indicate a retrieval operation that queries metadata about available sources without modifying, executing, or affecting any data.

Documented attack patterns abuse exactly the kind of access list_sources gives an agent:

POLICY

How to control list_sources

PolicyLayer is an MCP gateway — it sits between your AI agents and Financial Reports MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_sources:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_sources": {}
  }
}

list_sources is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Financial Reports MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

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EXPLORE

Related tools and policies

More Financial Reports MCP Server tools

Read get_company_detail Get detailed information about a company by its unique numeric ID. Read get_filing_detail Get detailed information about a specific filing. Read get_filing_type Get detailed information about a filing type by its ID. Read get_industry Get detailed information about a GICS industry by its code. Read get_industry_group Get detailed information about a GICS industry group by its code. Read get_latest_filings Get the latest financial filings, optionally filtered by company, ISIN, type, language, et Read get_processed_filing Get processed content for a filing by its ProcessedFiling ID. Read get_schema Get the OpenAPI3 schema for the Financial Reports API.

All 18 Financial Reports MCP Server tools →

Read tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about list_sources

What does the list_sources tool do? +

List all available data sources. It is categorised as a Read tool in the Financial Reports MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_sources? +

Register the Financial Reports MCP Server MCP server in PolicyLayer and add a rule for list_sources: 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 Financial Reports MCP Server. Nothing to install.

What risk level is list_sources? +

list_sources is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit list_sources? +

Yes. Add a rate_limit block to the list_sources 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.

How do I block list_sources completely? +

Set action: deny in the PolicyLayer policy for list_sources. 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.

What MCP server provides list_sources? +

list_sources is provided by the Financial Reports MCP Server MCP server (itisaevalex/financial-reports-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Financial Reports MCP Server tool call.

Start from Financial Reports MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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18 Financial Reports MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.