is_blacklisted
Check if an address is on the blacklist for a TIP-403 policy.
This record as markdown: /tools/arome3-tempo-mcp/is-blacklisted.md
What is_blacklisted does on Tempo
AI agents call is_blacklisted to retrieve information from Tempo without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why is_blacklisted is rated Low
This tool performs a read-only lookup to determine whether an address matches blacklist criteria. It has no side effects—it does not modify the blacklist, transfer funds, execute transactions, or trigger external actions.
From the tool's definition Tool name 'is_blacklisted' and description 'Check if an address is on the blacklist' indicate a query operation that retrieves status information without modifying state.
Attacks that exploit this kind of access
The rule that runs is_blacklisted safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Tempo, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For is_blacklisted, this is the rule to start with:
is_blacklisted is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Tempo, apply this rule, and every is_blacklisted call is checked against it from then on.
Questions about is_blacklisted
Check if an address is on the blacklist for a TIP-403 policy. It is categorised as a Read tool in the Tempo MCP Server, which means it retrieves data without modifying state.
Register the Tempo MCP server in PolicyLayer and add a rule for is_blacklisted: 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 Tempo. Nothing to install.
is_blacklisted 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 is_blacklisted 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 is_blacklisted. 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.
is_blacklisted is provided by the Tempo MCP server (arome3/tempo-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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