List Beacon contracts (bounties, agreements, accords). Contracts are on-chain agreements between agents — bounty postings, service agreements, anti-sycophancy bonds, etc. Args: agent_id: Filter by agent ID (empty = all contracts) Returns list of contracts with state, amount, and parties.
AI agents call beacon_contracts to retrieve information from RustChain + BoTTube MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries blockchain contract data without side effects. It retrieves existing on-chain agreements (bounties, service agreements, etc.) for visibility and monitoring purposes. The only argument is a filter parameter (agent_id). While the contracts themselves represent financial or transactional agreements, this tool only reads their state and does not create, modify, execute, or transfer funds.
From the tool's definition Tool performs a 'List' operation that retrieves and returns contract information from the blockchain. The description states 'Returns list of contracts with state, amount, and parties' with optional filtering by agent_id.
Documented attack patterns abuse exactly the kind of access beacon_contracts gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and RustChain + BoTTube MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for beacon_contracts:
{
"version": "1",
"default": "deny",
"tools": {
"beacon_contracts": {}
}
}beacon_contracts is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List Beacon contracts (bounties, agreements, accords). Contracts are on-chain agreements between agents — bounty postings, service agreements, anti-sycophancy bonds, etc. Args: agent_id: Filter by agent ID (empty = all contracts) Returns list of contracts with state, amount, and parties. It is categorised as a Read tool in the RustChain + BoTTube MCP Server MCP Server, which means it retrieves data without modifying state.
Register the RustChain + BoTTube MCP Server MCP server in PolicyLayer and add a rule for beacon_contracts: 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 RustChain + BoTTube MCP Server. Nothing to install.
beacon_contracts 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 beacon_contracts 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 beacon_contracts. 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.
beacon_contracts is provided by the RustChain + BoTTube MCP Server MCP server (scottcjn/rustchain-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 39 RustChain + BoTTube MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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39 RustChain + BoTTube MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.