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sl_capture

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How to capture new reusable patterns into ktx's semantic layer - when a measure, segment, or join belongs in the catalog and how to write it generically so it stays small and useful over time. Loaded by the post-turn memory-agent only. The research agent does not write to the SL.

packages/cli/src/skills/sl_capture/SKILL.md

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Oct 22, 2026
License
Apache-2.0

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# Semantic Layer - Capture

This skill covers **when** and **how** to capture new patterns into the semantic layer. For schema reference and query grammar, load the `sl` skill first.

When the current turn produces a reusable pattern (business metric, derived view, join pattern, computed dimension), capture it so future queries can reach for it instead of rediscovering it.

## SQL dialect

The user-facing prompt includes a `Warehouse:` line under the SL Sources index
(e.g. `Warehouse: BIGQUERY`). All `expr` strings - measure expressions, segment
predicates, computed-column SQL - execute on that warehouse and must use its
syntax. Date arithmetic in particular varies by dialect:

- **BigQuery**: `transaction_date >= TIMESTAMP_SUB(CURRENT_TIMESTAMP(), INTERVAL 90 DAY)` (when the column is `TIMESTAMP`); `event_date >= DATE_SUB(CURRENT_DATE(), INTERVAL 90 DAY)` (when `DATE`).
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