List all ISO 20022 message types relevant to stablecoin/crypto payments with required fields and stablecoin-specific extensions.
Part of the Iso20022oracle server.
Free to start. No card required.
AI agents call message_catalog to retrieve information from Iso20022oracle without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though message_catalog only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"message_catalog": {}
}
}See the full Iso20022oracle policy for all 12 tools.
These attack patterns abuse exactly the kind of access message_catalog gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
List all ISO 20022 message types relevant to stablecoin/crypto payments with required fields and stablecoin-specific extensions.. It is categorised as a Read tool in the Iso20022oracle MCP Server, which means it retrieves data without modifying state.
Register the Iso20022oracle MCP server in PolicyLayer and add a rule for message_catalog: 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 Iso20022oracle. Nothing to install.
message_catalog 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 message_catalog 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 message_catalog. 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.
message_catalog is provided by the Iso20022oracle MCP server (https://tooloracle.io/iso20022/mcp/). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 12 Iso20022oracle tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.