validate_atco_code
AI agents call validate_atco_code to retrieve information from UK Bus Departures MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool validates ATCO (Area, Operator, Code) codes used to identify UK bus stops. This is a read operation that checks if a code exists or is correctly formatted against a reference database. It has no side effects—it merely confirms whether a code is valid. There is no modification, deletion, or execution of arbitrary operations.
From the tool's definition Tool name 'validate_atco_code' and context within a bus departure information server indicate validation/lookup of bus stop codes. No description provided, but validation tools perform read-only lookups against reference data.
Attacks that exploit this kind of access
validate_atco_code. It is categorised as a Read tool in the UK Bus Departures MCP Server MCP Server, which means it retrieves data without modifying state.
Register the UK Bus Departures MCP Server MCP server in PolicyLayer and add a rule for validate_atco_code: 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 UK Bus Departures MCP Server. Nothing to install.
validate_atco_code 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 validate_atco_code 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 validate_atco_code. 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.
validate_atco_code is provided by the UK Bus Departures MCP Server MCP server (vandamd/bustimes-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.
Teams ship this data inside their own products. See what a licence covers →