Cool product! For custom API integrations, you may want to check out integration providers that support auth/tool-calls/MCP/syncs for a large API catalog so your agent does not spend time building it.

Full disclosure: I work at Nango.

Nango enables agent and product API integrations for 800+ APIs. It is open source, code-based and has Skills to build, test, deploy API integrations with coding agents (like Claude/Gemini/Codex). Also supports custom-tools via MCP/APIs. Do check it out!