You.com Answer API: Audit Citations, Excerpts, and Uncited Claims

Map the response contract before comparing quality

Save the raw Search API response before cleaning it. The source URL, title, retrieval time, extraction mode, returned order and errors are part of the evidence object.

Freeze a query-and-answer fixture

Use at least four task classes: a narrow fact, a multi-condition explanation, a comparison that needs evidence from more than one source, and a current product fact. Add one zero-result or inaccessible-page case. Freeze exact queries, domain filters, country and language settings, freshness controls, result count, model, answer instructions and acceptance rubric.

Run both extraction modes against the same query in close succession. If the result set changes, compare only overlapping URLs or record the retrieval difference as a separate variable. Otherwise the test confuses extraction with search ranking and index freshness.

The existing GET versus POST guide covers endpoint and cache semantics. The citation-ready passage guide explains claim-to-source review.

Score evidence and efficiency separately

Report medians and tail values for tokens and latency. For citation support, preserve reviewer disagreements instead of forcing a clean score.

Calculate citation value per 1,000 tokens carefully

A practical efficiency measure is supported material claims ÷ input tokens × 1,000. Publish the numerator and denominator, not only the ratio. A compact mode can score well while missing an essential claim; a full-page mode can support more claims but waste context.

Use a release gate: no extraction mode wins when it increases unsupported material claims, hides contradictory source language, or fails the task’s mandatory element; even if its token ratio improves. Choose a default by task class and keep a fallback when extraction returns insufficient evidence.

Status: this is a reproducible protocol, not a completed benchmark. Search Engine Answer has not run a production You.com key against this fixture, so no measured advantage is claimed.

Primary documentation

• You.com API changelog
• You.com Search API reference
• You.com Answer API guide

Normalize one request before comparing methods

Create one canonical request object containing query, country or locale, freshness, safe search, result count, live-crawl option, include domains, exclude domains, boost domains, and every other result-changing field. Generate GET and POST requests from that object so method comparison cannot drift through two hand-maintained builders.

For GET, serialize supported domain fields exactly as documented; repeated parameters are not a substitute for the required comma-separated form. For POST, preserve array order only when the API says it matters and normalize duplicate domains before sending.

Make cache keys and credentials safe

Never place the API key in the URL. If an intermediary caches GET responses, its key must cover the full normalized URL and authorization context, and its response handling must respect the documented Vary behavior. Logs, analytics, and error trackers should redact credentials and sensitive queries.

Set an explicit cache lifetime that matches the user job. A research query requiring current results should not receive a day-old shared response because it was cheaper. Save cache hit or miss, stored time, age, and purge reason in test records.

Test domain-filter semantics

Test include, exclude, and boost behavior individually before combining them. You.com says boosted domains receive a relative preference but are not mandatory; include and exclude semantics are stronger constraints. Preserve an empty result when filters are too narrow rather than silently removing the filter.

Build cases for long lists, duplicates, subdomains, paths, commas, invalid combinations, non-ASCII domains, URL-length rejection, and a list that yields no results. Compare normalized request meaning, response status, result destinations, and a response hash while preserving the date.

Choose the method and preserve time

Use GET when the request is short, observable, and safely cacheable under your infrastructure. Use POST when the body is complex, long, or should not enter URL-oriented logs. Keep one shared validator so switching methods does not change domain precedence or defaults.

A reproducible report names the method, normalized request, cache state, API version, date, and response. It can show equivalence or difference for that sample; it cannot claim one method has a permanent ranking advantage.

Use the AI visibility tools buyer’s matrix for authentication and privacy, and the small-experiment method for repeatable runs.

Primary documentation

• You.com: Web Search API

Find the breaking assumptions

Search the codebase, database schema, serializers, templates, exports, analytics, and tests for authors. The most fragile patterns are required array access, non-null database columns, joins that expect at least one author, and display components that suppress a source card when attribution is absent.

Also inspect derived data. A pipeline may convert authors into entity tables, trust scores, deduplication keys, bylines, filters, or report dimensions. Removing the visible field from one interface does not repair those downstream assumptions.

Check alerting as well. A monitor that treats a missing optional field as a provider outage can create false incidents, while a permissive parser can quietly discard the rest of a malformed source object. Contract tests should distinguish an expected field removal from a genuinely invalid response.

Use a resilient source model

Represent absence explicitly. An empty author list can mean the provider no longer supplies the field; it does not mean the source has no author. Add fields such as author_status and author_origin if attribution quality affects a decision.

Do not replace the field with unbounded scraping

Fetching every cited URL to recover a byline changes cost, latency, privacy, terms, and failure behavior. It can also produce false attribution when a page lists editors, reviewers, organizations, or unrelated people. Make enrichment a separate, observable process with a defined purpose.

When author identity matters, prefer explicit page metadata and visible bylines, record where the value came from, and keep provider-supplied attribution distinct from publisher-verified attribution. When author identity does not change the user decision, showing the source title and domain may be sufficient.

The evidence-led publishing guide applies the same rule to article claims: unknown should remain unknown until a source supports it.

A migration test plan

1. Save pre-change fixtures that contain one or more authors.
2. Add current v1 and Answer API fixtures without the field.
3. Confirm parsing succeeds when authors is missing, null, or empty.
4. Verify source cards still show title, URL, and date where available.
5. Check exports, analytics, search indexes, and entity tables.
6. Mark attribution as unavailable rather than fabricating a value.
7. Monitor the provider changelog and version the adapter.

Run contract tests at the provider boundary and domain-model tests at the application boundary. The application should not need a hotfix every time a provider removes an optional field. The same normalized-source approach supports the Perplexity citation migration.

Primary documentation

• You.com changelog: authors field removal
• You.com Web Search API guide
• You.com Answer API reference