Get market breadth aggregates (advance/decline counts and ratio,
AI agents call get_market_breadth to retrieve information from Signal8 MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries market breadth aggregates (advance/decline counts and ratios), which are standard financial metrics. It performs read-only access to data with no side effects, modification capabilities, or ability to execute trades or financial transactions. The low severity reflects that misuse would only expose market data already available through public financial sources.
From the tool's definition Tool name 'get_market_breadth' and description 'Get market breadth aggregates (advance/decline counts and ratio' indicate data retrieval only. No modification, execution, deletion, or financial transaction occurs.
Attacks that exploit this kind of access
Get market breadth aggregates (advance/decline counts and ratio,. It is categorised as a Read tool in the Signal8 MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Signal8 MCP Server MCP server in PolicyLayer and add a rule for get_market_breadth: 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 Signal8 MCP Server. Nothing to install.
get_market_breadth 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_market_breadth 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_market_breadth. 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_market_breadth is provided by the Signal8 MCP Server MCP server (signal8ai/signal8-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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