pricebook_by_symbol

Gets Level II order book data for a symbol (requires Gold subscription).

SERVEROpen Stocks MCP SOURCEopen-agent-tools/open-stocks-mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/open-agent-tools-open-stocks-mcp/pricebook-by-symbol.md

WHAT IT DOES

What pricebook_by_symbol does on Open Stocks MCP

AI agents call pricebook_by_symbol to retrieve information from Open Stocks MCP without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why pricebook_by_symbol is rated Low

This tool retrieves and queries Level II order book (market depth) data—a standard read-only market data endpoint. It has no side effects: it does not create orders, modify positions, execute trades, delete data, or move money. The Gold subscription requirement is a licensing/access control detail, not a functional characteristic that elevates the risk category.

From the tool's definition Tool name 'pricebook_by_symbol' and description 'Gets Level II order book data for a symbol' indicate retrieval of market data with no modification or execution of orders.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs pricebook_by_symbol safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Open Stocks MCP, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For pricebook_by_symbol, this is the rule to start with:

pricebook_by_symbol Allowed

pricebook_by_symbol is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

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

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Open Stocks MCP, apply this rule, and every pricebook_by_symbol call is checked against it from then on.

FAQ

Questions about pricebook_by_symbol

What does the pricebook_by_symbol tool do? +

Gets Level II order book data for a symbol (requires Gold subscription). It is categorised as a Read tool in the Open Stocks MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on pricebook_by_symbol? +

Register the Open Stocks MCP server in PolicyLayer and add a rule for pricebook_by_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 Open Stocks MCP. Nothing to install.

What risk level is pricebook_by_symbol? +

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

Can I rate-limit pricebook_by_symbol? +

Yes. Add a rate_limit block to the pricebook_by_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.

How do I block pricebook_by_symbol completely? +

Set action: deny in the PolicyLayer policy for pricebook_by_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.

What MCP server provides pricebook_by_symbol? +

pricebook_by_symbol is provided by the Open Stocks MCP server (open-agent-tools/open-stocks-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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