Get OV-fiets availability at a train station
AI agents call get_ovfiets to retrieve information from NS Travel Information Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves real-time information about bike-sharing availability (OV-fiets is Dutch public transport bike-sharing) at train stations. It is a read-only query with no side effects, no data modification, no code execution, and no financial implications.
From the tool's definition Tool name 'get_ovfiets' and description 'Get OV-fiets availability at a train station' indicate a query operation that retrieves current availability information without modifying any data.
Attacks that exploit this kind of access
Get OV-fiets availability at a train station. It is categorised as a Read tool in the NS Travel Information Server MCP Server, which means it retrieves data without modifying state.
Register the NS Travel Information Server MCP server in PolicyLayer and add a rule for get_ovfiets: 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 NS Travel Information Server. Nothing to install.
get_ovfiets 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_ovfiets 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_ovfiets. 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_ovfiets is provided by the NS Travel Information Server MCP server (kallivdh/ns-mcp-server). 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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