Ranking

Darwin Rank orders executable capabilities for the current intent. It combines public capability fit, availability, policy eligibility, and bounded reliability evidence without reading private conversation transcripts.

Treat order as canonical

Darwin returns capabilities in the order you should present them. Match evidence explains useful attributes; it is not a probability. Do not rerank with an invented confidence score. Keep the user-visible decision grounded in:

capability title and owning AI
whyMatched evidence
current availability
price or quote requirements
connection, account, or payment requirements

Do	Avoid
Explain meaningful differences with returned evidence.	Invent a percentage confidence score.
Preserve the server order in the first presentation.	Let a model silently reorder results.
Ask the user when tradeoffs are consequential.	Select only from title similarity.

Follow the cursor

Set limit from 1 to 50. When nextCursor is not null, send it unchanged with the same query, context, filters, and limit.

{
  "query": "translate a legal document into French",
  "limit": 10,
  "cursor": "opaque-cursor-from-the-previous-response"
}

A cursor is opaque. Do not decode, edit, persist indefinitely, or reuse it after changing the request.

let cursor: string | undefined;

do {
  const page = await darwin.search({
    query,
    filters,
    limit: 10,
    cursor,
  });

  render(page.results);
  cursor = page.nextCursor ?? undefined;
} while (cursor && shouldLoadMore());

Interactive products should load another page in response to user intent. Do not exhaust every page before showing the first useful results.

Keep rank and reliability distinct

Ranking decides the order for one request. Reliability is one bounded input to that decision, not a public score and not a substitute for intent match, policy eligibility, price, or availability. See Reliability for the attribution and privacy boundary.

Pin the selected revision

Search results can change as capabilities publish revisions or availability changes. Once a user selects a result, preserve its exact capabilityId and capabilityRevision. Let Act reject a stale revision instead of silently substituting a different provider.

Refresh versus continue

Situation	Correct operation
The user wants more of the same result set	Reuse `nextCursor` with the identical request.
The user changes a preference or hard requirement	Start a new Search without the old cursor.
The user already selected a capability	Keep the exact revision and continue to Act.
Act rejects a stale revision	Explain the change, rerun Search, and ask the user to select again.

Continue with Filters to constrain eligibility or Sponsored Results to understand how paid placement will remain separate from organic rank.

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Admin

Treat order as canonical

Follow the cursor

Keep rank and reliability distinct

Pin the selected revision

Refresh versus continue

​Treat order as canonical

​Follow the cursor

​Keep rank and reliability distinct

​Pin the selected revision

​Refresh versus continue

Treat order as canonical

Follow the cursor

Keep rank and reliability distinct

Pin the selected revision

Refresh versus continue