The Powerduck Blog
Product updates, engineering notes, and guides for designing, debugging, testing, mocking, and serving MCP tools from one OpenAPI spec.
Browse the guidesQuick answer Short answer: If your agent is already writing good code but its API calls are wrong, the missing piece is not a better editor — it is a contract
Read articleQuick answer: Cursor and Powerduck are not the same kind of tool, and treating them as rivals is the first mistake. Cursor is an AI code editor that consumes tools
Read articleThe backfill API returned 202 Accepted with a job id, the agent logged the response and reported done, and never checked whether the worker finished. The job failed in the background, and the report came back empty on the first real run.
Read articleThe agent set NEW_EXPORT=true in its own shell, watched the button work, and reported done. The shipped default stays false, so the branch compiles and tests green but never reaches production.
Read articleQuick answer: The best Postman alternatives in 2026 are the ones that match how teams actually work now: local-first, friendly with Git, and built around an OpenAPI contract rather than
Read articleQuick answer: An AI coding agent is only as good as the context it is given and the verification it is held to. The two failures that dominate real work
Read articleQuick answer: A Model Context Protocol (MCP) server exposes an API's operations as tools that an AI agent can discover and call, with a typed input schema and
Read articleQuick answer: OpenAPI code generation turns a contract into typed clients, server stubs, or models, so the types your code compiles against are the same types the service serves. The
Read articleQuick answer: API debugging is the systematic work of locating where a request goes wrong — the client, the network, the gateway, or the service — by capturing the actual request and
Read articleQuick answer: API mocking stands in for a real service with a controllable stand-in that returns canned or spec-driven responses, so frontend, mobile, and integration work can proceed before the
Read articleQuick answer: API testing is how you verify that a service honors its contract and supports real business flows, not just that a happy-path request returns 200. Layer it: request
Read articleQuick answer: OpenAPI is a machine-readable contract that describes an HTTP API — its paths, operations, request and response shapes, authentication, and examples. Treat it as the single source of truth
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