Materialize MCP

Materialize is an operational data warehouse that keeps SQL views incrementally up to date as new events arrive. Its MCP interface is served by the database itself over HTTP, with no sidecar process or separate server to deploy, and it turns curated database objects into tools an agent can call. Indexed views are the unit of exposure: the view definition acts as the contract, the index makes the lookup fast, and the agent receives a typed tool instead of open-ended SQL against raw tables. Two endpoints split the audience. The agent endpoint is for discovering and querying those data products at request time. A developer endpoint reads the mz_ system catalog so an operator or coding assistant can inspect clusters, indexes, sources, and freshness while troubleshooting. The protocol follows the standard MCP shape over JSON-RPC: initialize, list the available tools, call one. The payoff is answer freshness. Because Materialize maintains results as data changes instead of recomputing on a schedule, an agent asking about inventory levels, risk exposure, or account state reads numbers that reflect the current stream rather than the last batch run. It fits teams building customer-facing agents or internal copilots on top of streaming sources such as Kafka and Postgres change data capture, where a stale answer is worse than a slow one.