MCP Engine Refactoring

PBI Refactoring

Safe multi-object change orchestration: dependencies, baselines, checkpoints, staged edits, verification, rollback. The phases and their order live in refactoring-workflow — follow it phase by phase; do not edit before its phases 1-4 are complete.

Workflow

1. Scope — object list and change class, confirmed with list_model { "operation": "list", "spec": { "type": "<type>" } } / { "operation": "search", "spec": { "query": "<name>", "mode": "name" } }.
2. Baseline — 3-5 representative run_query { "operation": "execute", "query": "<aggregate>" } calls recorded verbatim, or durable manage_tests regression_snapshot / measure_assertion tests that pass before any edit.
3. Impact — manage_dependencies { "operation": "used_by", "spec": { "target": { "type": "<type>", "table": "<table>", "name": "<name>" } } } per object (spec.target is required on every call) plus list_model expression search (mode: "dax" and "m"), repeated until no new consumers appear; blast radius reported to the user first.
4. Safety net — manage_model_changes { "operation": "pin_checkpoint", "name": "before-<goal>" }; multi-object edits staged as a named changeset (create_changeset returns the changeset_id that add_to_changeset, preview_changeset, and apply_changeset require).
5. Execute in order — create replacements → update consumers → rename or delete originals; dry_run: true on the first attempt of each operation shape.
6. Verify — baselines re-run and compared exactly; diff_transaction (with the transaction_id from list_transactions) reviewed against the plan; old names searched one final time.
7. Decide — keep, or rollback_transaction / restore_checkpoint on any unintended mismatch.

Recipes for the common cases (rename with consumers, measure consolidation, calc-group relocation, hygiene sweep) are in the workflow guide.

Guardrails

• One refactor goal per run; never mix renames with logic changes.
• Dependency analysis cannot see report visuals or external consumers that bind by name — warn the user on every rename of a visible object.
• An intended value change discovered mid-refactor must be confirmed by the user, never silently absorbed.
• The actual edits follow the authoring guides of mcp-engine-schema-authoring and mcp-engine-semantic-authoring; this skill owns the sequence around them. If those skills are not installed, make the edits from the tools' inputSchema or ask the user to add them.

Report results

After a refactor, report:

1. Scope, change class, and final consumer count per object.
2. Checkpoint and changeset ids created.
3. Each edit applied, in order.
4. Baseline comparison outcome: identical, intended differences confirmed, or rolled back.
5. Remaining risks (report-layer renames, deferred deletions) and the rollback point still available.

References

• refactoring-workflow — the phase-by-phase workflow, ordering rules, and recipes