a2b_discover

THE RISK

Low Risk

Why a2b_discover needs a policy

This tool performs a search/query operation on blockchain records, which is a read-only operation. It retrieves information about on-chain agents and MCP tools but does not create, modify, delete, or execute any actions. The search functionality is characteristic of Read category tools that query data without side effects.

From the tool's definition Tool name 'a2b_discover' with description stating 'Search on-chain agent and MCP tool records.' The verb 'search' indicates data retrieval without modification or side effects.

Documented attack patterns abuse exactly the kind of access a2b_discover gives an agent:

POLICY

How to control a2b_discover

PolicyLayer is an MCP gateway — it sits between your AI agents and Bitcoin SV MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for a2b_discover:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "a2b_discover": {}
  }
}

a2b_discover is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Bitcoin SV MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

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All 80 Bitcoin SV MCP Server tools →

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Go deeper

Roll out MCP under one policy → Per-person scoped tokens, one central policy, and full audit across every server your team connects.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →
PolicyLayer vs alternatives → How deterministic, per-call MCP policy compares with gateways, identity layers, and authorisation platforms.

FAQ

Questions about a2b_discover

What does the a2b_discover tool do? +

Search on-chain agent and MCP tool records. Use. It is categorised as a Read tool in the Bitcoin SV MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on a2b_discover? +

Register the Bitcoin SV MCP Server MCP server in PolicyLayer and add a rule for a2b_discover: 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 Bitcoin SV MCP Server. Nothing to install.

What risk level is a2b_discover? +

a2b_discover is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit a2b_discover? +

Yes. Add a rate_limit block to the a2b_discover 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.

How do I block a2b_discover completely? +

Set action: deny in the PolicyLayer policy for a2b_discover. 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.

What MCP server provides a2b_discover? +

a2b_discover is provided by the Bitcoin SV MCP Server MCP server (b-open-io/bsv-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Bitcoin SV MCP Server tool call.

Start from Bitcoin SV MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →