get_last_topups
AI agents call get_last_topups to retrieve information from Africa's Talking Airtime MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves historical airtime transaction records without modifying, deleting, or executing operations. It has no side effects and represents a standard data retrieval operation. Low severity because reading transaction history has minimal blast radius—no financial transactions are executed, no data is modified, and the impact is limited to information disclosure.
From the tool's definition Tool name 'get_last_topups' and context from sibling tools (count_topups_by_number, sum_last_n_topups) indicate this retrieves historical top-up transaction data. The server description explicitly lists 'view transaction history' as a capability.
Attacks that exploit this kind of access
get_last_topups. It is categorised as a Read tool in the Africa's Talking Airtime MCP MCP Server, which means it retrieves data without modifying state.
Register the Africa's Talking Airtime MCP server in PolicyLayer and add a rule for get_last_topups: 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 Africa's Talking Airtime MCP. Nothing to install.
get_last_topups 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_last_topups 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_last_topups. 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_last_topups is provided by the Africa's Talking Airtime MCP server (nasoma/africastalking-airtime-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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