CommandLayer MCP Server

Trust & Verification v1 MCP server for CommandLayer.

Purpose

This server exposes MCP tools and bridges runtime-backed operations to the CommandLayer runtime over HTTP.

Supported MCP tools

• discover_action — list available trust-verification actions and their schemas
• get_action_schema — return CLAS request and receipt schema for a given verb
• verify_receipt — forward receipt to the runtime verifier and return result
• resolve_agent — resolve ENS agent name to metadata
• get_protocol_version — return current protocol version and signing spec
• validate_receipt_schema — validate a receipt object against the v1.1.0 schema locally

Runtime bridge

verify_receipt forwards { receipt } to the runtime verify endpoint and returns the runtime response directly. Trust comes from verifiable CLAS receipts (canonical JSON → SHA-256 → Ed25519), not from the MCP server itself.

Runtime environment variables

• COMMANDLAYER_RUNTIME_URL (optional, default: https://runtime.commandlayer.org)
• COMMANDLAYER_VERIFY_PATH (optional, default: /verify)
• ETHEREUM_RPC_URL (optional, used for ENS text record lookups, default: https://eth.llamarpc.com)
• PORT (optional, default: 3000)

Trust-verification verbs (CLAS canonical)

verify, authenticate, authorize, attest, sign, permit, grant, approve, reject, endorse. Only verify is connected to the runtime verifier in v1; all verbs are schema-discoverable via get_action_schema.

Run

npm install
npm start

Railway deploy

Deploy with Railway using railway.toml, then point mcp.commandlayer.org to the deployment.

ENS TXT records (CLAS-canonical keys)

The following ENS TXT record keys are defined by the CLAS ens-discovery spec:

• cl.schema — URI for the CLAS schema set
• cl.openapi — URI for the OpenAPI descriptor
• cl.mcp — URI for this MCP server
• cl.receipt.schema — URI for the receipt schema
• cl.verifier — verifier endpoint URI
• cl.capability — capability declaration
• cl.version — CLAS profile version
• cl.family — schema family identifier (e.g. trust-verification)
• cl.verb — supported verb(s)
• cl.proof — supported proof primitive(s) (e.g. Ed25519)
• cl.signer — expected signer identifier(s)