Look up a validator by node ID — stake, uptime, delegation info.
Part of the Avalanche AVAX MCP server.
Free to start. No card required.
AI agents call blockchain_lookup_validator to retrieve information from Avalanche AVAX MCP 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 blockchain_lookup_validator 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": {
"blockchain_lookup_validator": {}
}
}See the full Avalanche AVAX MCP policy for all 44 tools.
These attack patterns abuse exactly the kind of access blockchain_lookup_validator 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.
Look up a validator by node ID — stake, uptime, delegation info.. It is categorised as a Read tool in the Avalanche AVAX MCP MCP Server, which means it retrieves data without modifying state.
Register the Avalanche AVAX MCP server in PolicyLayer and add a rule for blockchain_lookup_validator: 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 Avalanche AVAX MCP. Nothing to install.
blockchain_lookup_validator 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 blockchain_lookup_validator 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 blockchain_lookup_validator. 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.
blockchain_lookup_validator is provided by the Avalanche AVAX MCP server (https://build.avax.network/api/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 44 Avalanche AVAX MCP 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.