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1. Agents don't know the APIs. This is a way for you to declare them.

2. You get to decide what functionality you want to expose agents to.

3. An API enables reliable tool use.

The APIs have docs. The agent can go read them and build against them.

The agent doesn't know what tools are available on your host. And searching for the documentation is slower and less reliable. It's an optimization.

the guiding promise of AI was able to figure out unstructured data. Manually crafting prompts and description examples for tools is a step orthogonal to progress. Searching for docs, great now you have 1000 tools saying they do same thing exposed to model, now we need another search on top of that?

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