Numetal Labs · Engineering Bureau Doc CB-011 · Rev 2026-07-17 Status: Demo / reference

Demo harness · Cloudflare Agents SDK · not the product path

Two demo agents. One MCP.

Reference seller and buyer Durable Objects for the pitch. Both call addMcpServer('curb', 'https://api.curb.numetal.xyz/mcp'). Product path: add that MCP to your harness. No private keys here — settle with pay / agentcash.

harness.curb Install (product) Docs

Reference exhibit — demo only

Canonical: curb.numetal.xyz/harnessLive pair: harness.curb.numetal.xyz

Demo agents — for the pitch. Production: add https://api.curb.numetal.xyz/mcp to your harness.

curb-seller Demo

Maintains open offers via MCP. Fulfills at /fulfill. Cron every 15m.

Open seller /health

curb-buyer Demo

Lists offers, creates intents, surfaces single-payee pay challenges.

Open buyer /health

Architecture §1

CURB Worker (api.curb.numetal.xyz)  = product: MCP + skill + REST + x402
curb-harness Worker                 = DEMO / reference: Agents SDK seller + buyer
Your harness                        = product path: wire MCP + skill
Payment                             = pay MCP / agentcash (outside harness)

Numetal Labs · CURB · Doc CB-011 · Rev 2026-07-17Filed at curb.numetal.xyz · contact@numetal.xyz