Rubric / Discoverability
Link response headers
discoverability.link_headers
weight 1deterministic
HTTP `Link:` response headers carry useful relations (canonical, alternate, describedby) that agents consume without parsing HTML.
Definition
Check ID
discoverability.link_headers
Category
Discoverability
Weight
1
Counts toward the score
Yes.
Evaluated by
A fixed rule with no threshold of our choosing. The same input always produces the same verdict.
Standard maturity
established
Canonical spec
Introduced in
r2026.04.2
Retired in
Still active.
History
Every change to the instrument— including the versions that changed this check
Machine-readable
/rubric.json— this check, and every other, as data
How often this check is right
No rate published. Too few labelled cases to publish a rate: 1 flagged case (30 needed to publish), 1 defective case (30 needed to publish). The counts are the honest answer here. The matrix behind discoverability.link_headers is 2 labelled cases — reported here rather than turned into a percentage that would read as more certain than the evidence is.
Corpus v1, measured under rubric r2026.11.0. Full method and every other check at /rubric/accuracy.
How to fix it
Emit `Link:` headers for canonical, alternate-language, and describedby relations. Agents that fetch HEAD-only or stream-render rely on these.
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