Open-source Kaktoos verifies AI-written API integrations against OpenAPI contracts via MCP
richocolate · reddit · 2026-09-11
A developer released Kaktoos, an open-source tool targeting a specific pain point of AI coding agents: agents write API integrations fast, but when the same agent also writes the tests, passing tests don't prove the integration matches the real API.
Kaktoos takes an independent verification approach: after the agent generates integration code, Kaktoos executes multi-step API workflows, checks responses against the OpenAPI contract and the real API, detects issues like missing required fields, wrong types, or unexpected status/content types, and feeds structured failures back to the agent to fix.
Key features:
- Verification exposed via MCP, so coding agents can call it directly
- The same verification runs in GitHub Actions (CI)
- The core experiment: is independent, third-party verification valuable when code is AI-generated?
The author is seeking early feedback on whether the workflow is usable, whether defining scenarios is too much overhead, and whether it catches bugs existing tests miss. Repo: KaktoosLabs/kaktoos.
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