Rubric / Actionability
Reachability
reachability.status
weight 2deterministic
Landing URL returns a 2xx after at most one redirect.
Definition
Check ID
reachability.status
Category
Actionability
Weight
2
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
Introduced in
r2026.04.1
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 reachability.status is 3 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
An agent gets whatever this URL returns, and nothing else. Serve a 2xx at the address you publish: a 403 or 404 means the agent reads an error page instead of your site, and if the block is aimed at bots, decide deliberately which agents it should apply to. Reach it in at most one redirect, since chained redirects break some agent crawlers.
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