Free live preview for Fia's paid contract_risk/token-safety checkout path.
Part of the Fia Signals Mcp server.
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AI agents use contract_risk_preview to create or modify resources in Fia Signals Mcp. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call contract_risk_preview repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Fia Signals Mcp.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"contract_risk_preview": {
"limits": [
{
"counter": "contract_risk_preview_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Fia Signals Mcp policy for all 6 tools.
These attack patterns abuse exactly the kind of access contract_risk_preview gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Free live preview for Fia's paid contract_risk/token-safety checkout path.. It is categorised as a Write tool in the Fia Signals Mcp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Fia Signals MCP server in PolicyLayer and add a rule for contract_risk_preview: 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 Fia Signals Mcp. Nothing to install.
contract_risk_preview is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the contract_risk_preview 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 contract_risk_preview. 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.
contract_risk_preview is provided by the Fia Signals MCP server (https://x402.fiasignals.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 6 Fia Signals Mcp tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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