analyzing-table

name	analyzing-table
description	Use when scoping a single table, view, or materialized view for migration and the next step depends on identifying its writer, SQL structure, or dependency call tree from catalog-backed DDL context.
user-invocable	true
argument-hint	<schema.object> — Table, View, or Materialized View FQN

Analyzing Table

Scope one table, view, or materialized view from catalog-backed DDL context.

When to Use

Use this skill when:

• a table needs its writer selected before downstream work
• a view or materialized view needs SQL elements, call tree, and logic summary written to catalog
• /scope depends on catalog-backed scoping, not ad-hoc inspection

Do not use this skill when:

• the object is already confirmed as a dbt source and no writer analysis is needed
• the prerequisite catalog files are missing; fix readiness failures first

Arguments

$ARGUMENTS is the fully-qualified name (e.g. silver.DimCustomer, silver.vw_CustomerSales). Ask the user if missing.

Guardrails

• Use canonical /scope codes from ../../lib/shared/scope_error_codes.md.
• Diagnostics in warnings or errors must include code, severity, and message.
• Treat existing scoping and statements as non-authoritative on reruns. Recompute and overwrite.
• Use .staging/ under the active project root only. Do not use /tmp.
• Do not include status in persisted scoping payloads.

Before invoking

Check stage readiness:

uv run --project "${CLAUDE_PLUGIN_ROOT}/packages/ad-migration-internal" migrate-util ready scope --object <fqn>

If ready is false, report the failing check's code and reason to the user and stop. Do not run discovery, context, or write commands after a failed readiness check.

Object type detection

Check whether catalog/views/<fqn>.json exists:

• If yes → this is a view or MV. Follow the View Pipeline below.
• If no → this is a table. Follow the Table Pipeline below.

Quick Reference

Object	Normal path	Open reference when	Persisted outcome
table	run references/table-pipeline.md	per-candidate procedure analysis: references/procedure-analysis.md; non-trivial writer selection: references/table-writer-resolution.md	selected_writer plus rationale and candidate context
view or MV	run references/view-pipeline.md	manual SQL feature inspection needs dialect help: references/statement-classification.md	sql_elements, call_tree, logic_summary, rationale

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Table Pipeline

Read references/table-pipeline.md and execute it.

Use references/procedure-analysis.md for each candidate procedure.

Use references/table-writer-resolution.md only when writer selection is not trivial.

View Pipeline

Read references/view-pipeline.md and execute it.

Use references/statement-classification.md only when manual SQL feature inspection needs dialect-specific help.

Common Mistakes

• Do not skip the readiness check.
• Do not bypass the top-level guardrails just because a reference has the details.
• Do not open every reference up front. Open the workflow reference first, then the exception-specific reference only when needed.

Error handling

Use references/error-handling.md for command exits and reference-level failures.