AI agents call lithtrix_passport_derive to retrieve information from Lithtrix without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs deterministic key derivation from a master seed and agent ID. Key derivation is a pure cryptographic computation that reads inputs and produces output without modifying any persistent state, creating resources, executing arbitrary code, deleting data, or moving money.
From the tool's definition Tool derives Ed25519 keypair material 'locally' and 'never sends seed to Lithtrix' — it is a cryptographic derivation operation with no network transmission, data mutation, or external side effects.
Attacks that exploit this kind of access
Derive deterministic Ed25519 passport PEMs locally from LITHTRIX_PASSPORT_MASTER_SEED + agent_id — never sends seed to Lithtrix. It is categorised as a Read tool in the Lithtrix MCP Server, which means it retrieves data without modifying state.
Register the Lithtrix MCP server in PolicyLayer and add a rule for lithtrix_passport_derive: 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 Lithtrix. Nothing to install.
lithtrix_passport_derive 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 lithtrix_passport_derive 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 lithtrix_passport_derive. 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.
lithtrix_passport_derive is provided by the Lithtrix MCP server (lithtrix/lithtrix-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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