Code-as-Interface: How Two Tools Replace 2,500 Endpoints

The most radical pattern replaces tool definitions entirely with code generation. Instead of presenting the agent with a catalog of operations, you give it two capabilities: search (explore what’s available) and execute (act on what you found).

Cloudflare’s “Code Mode” is the clearest example: 2 tools replace 2,500 endpoint definitions. The agent writes JavaScript to search the OpenAPI spec, narrows to relevant endpoints, and chains multiple API calls in a single operation.

Token footprint: 1,170,000 → ~1,000. That’s a 99.9% reduction that stays fixed regardless of API size.

Anthropic and Block’s Goose agent independently converged on the same pattern. As Cloudflare’s engineers observed: “LLM — as explored in the intelligence factory race between AI labs — s are better at writing code to call APIs than at calling APIs directly.”

This aligns the API with how the consumer actually thinks — through code, not through enumerated menus.

Read the full analysis on The Business Engineer

Read the full analysis on The Business Engineer