# `ExAthena.Modes.ReAct`
[🔗](https://github.com/udin-io/ex_athena/blob/v0.7.1/lib/ex_athena/modes/react.ex#L1)

Default mode: Reason-Act cycle.

Each iteration:

  1. Build a Request from current messages + tools + system prompt.
  2. Call the provider — uses `stream/3` when the loop was started with
     `on_event:` set (so partial token deltas flow to the caller in
     real time), falls back to one-shot `query/2` when no event
     callback is registered.
  3. Extract tool calls (native, or TextTagged fallback via
     `ExAthena.ToolCalls`).
  4. If no tool calls: emit `{:content, text}`, set `finish_reason:
     :stop`, and halt.
  5. If tool calls: run them (parallel-safe ones concurrently, mutating
     ones serially), append results, continue.

Budget + mistake-counter checks happen between iterations in the kernel.
This mode only implements the turn-by-turn behaviour.

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*Consult [api-reference.md](api-reference.md) for complete listing*