Check if an Algorand address needs to opt into an asset before swapping. Returns true if opt-in is needed, false otherwise. Always returns false for ALGO (ASA 0). Use before executing a swap to determine if wallet_optin_asset should be called first.
AI agents call api_haystack_needs_optin to retrieve information from Algorand MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a read-only operation that queries blockchain state to determine if a prerequisite condition exists before a transaction. It retrieves information without modifying any data or executing operations. The tool is informational and intended to be used defensively before executing swaps, typical of Read category functions like get, check, or query.
From the tool's definition Tool checks/retrieves whether an address needs opt-in (returns true/false) with no side effects. Description explicitly states it 'Check if' and 'Returns' status, indicating a query operation.
Documented attack patterns abuse exactly the kind of access api_haystack_needs_optin gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Algorand MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for api_haystack_needs_optin:
{
"version": "1",
"default": "deny",
"tools": {
"api_haystack_needs_optin": {}
}
}api_haystack_needs_optin is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Check if an Algorand address needs to opt into an asset before swapping. Returns true if opt-in is needed, false otherwise. Always returns false for ALGO (ASA 0). Use before executing a swap to determine if wallet_optin_asset should be called first. It is categorised as a Read tool in the Algorand MCP MCP Server, which means it retrieves data without modifying state.
Register the Algorand MCP server in PolicyLayer and add a rule for api_haystack_needs_optin: 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 Algorand MCP. Nothing to install.
api_haystack_needs_optin 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 api_haystack_needs_optin 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 api_haystack_needs_optin. 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.
api_haystack_needs_optin is provided by the Algorand MCP server (goplausible/algorand-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Algorand MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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172 Algorand MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.