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Notes from building agents that work
What we shipped, how it works underneath and how to get the most from it.
Latest
·3 min read
Fast and slow models: every message goes to the right one
Pair an agent's main model with a fast one. Greetings and lookups cost less, and the hard work still gets the careful model.
Definable team
·1 min read
See why a message went to the fast model
Traces now open with a Router step: the model it picked, how sure it was, and why the main model took over when it did.
·2 min read
Agents can now search the web and read pages
Two new tools, web search and web fetch, with numbered sources on every answer that used them.
·2 min read
Custom skills: teach agents how your team works
Write a procedure once as a skill. Agents read it only when a task needs it, so a long playbook costs almost nothing until it's used.
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