Exa

Exa is a neural, embeddings-based search API — it finds pages by meaning rather than keywords and returns ranked results with highlights and relevance scores. BitRouter speaks it natively as a backend for the built-in web search tool, so bringing it in is one line plus a key.

Get a key

Create an API key in the Exa dashboard and export it:

export EXA_API_KEY=...

Add Exa to BitRouter

Declare an exa backend under server_tools.web_search. The key resolves from an explicit api_key (which supports ${VAR}) or, when omitted, the conventional EXA_API_KEY:

# bitrouter.yaml
server_tools:
  web_search:
    backends:
      - kind: exa          # key from api_key or EXA_API_KEY

Use it

A request turns the tool on by declaring it; pin Exa with args.backend:

{ "tools": [ { "type": "bitrouter:web_search", "args": { "backend": "exa" } } ] }

The model then calls web_search with a query; BitRouter runs it against Exa and feeds the results back inside the tool loop. Exa fills title, snippet (highlights), score, and published on each result.

Learn more

• Web search — the result schema, per-request max_results, and loop bounds.
• Exa — API reference