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webstudio/scripts/docs/content-engine-reference-page.md
Oleg Isonen 1b48716ff4 docs: Document MDX-backed Content Blocks (#6273)
## Summary

- Document how people create, connect, edit, validate, and publish
MDX-backed Content Blocks.
- Document the complete MCP workflow, including scoped expression
sources, frontmatter updates, diagnostics, conflicts, and disconnect
behavior.
- Add two focused screenshots for the human workflow.
- Fix issues found by a low-reasoning MCP agent while executing every
documented workflow.

Ref #6182

## Implementation notes

- Connection confirmation uses the public `confirmReplacement` field
because `confirm` is reserved as a hidden transport field.
- MCP edits frontmatter with `update-content-block-frontmatter`;
materialized MDX elements are not persistent targets for generic
instance mutation tools.
- Reload now intentionally discards a conflicted local source and
accepts the Asset's latest storage revision before an edit is reapplied.
- Generated MCP documentation and runtime contracts are updated from
their source files.

## Checklist

- [x] Document the human MDX Content Block workflow.
- [x] Document MCP discovery, connection, editing, diagnostics,
frontmatter, dynamic sources, conflicts, and disconnection.
- [x] Add only screenshots that clarify otherwise hard-to-describe UI
steps.
- [x] Test every documented MDX capability through the local MCP CLI
with a low-reasoning agent.
- [x] Reproduce and fix the replacement-confirmation schema mismatch.
- [x] Reproduce and fix persistent-session conflict reload and reapply.
- [x] Add regression tests that failed before each product fix and pass
afterward.
- [x] Regenerate runtime contracts and generated MCP documentation.
- [x] Review authoritative `docs/` content and update affected pages.
- [x] Run affected tests, typechecks, formatting, and diff checks.

## Verification

- Project Build: 208 affected tests passed.
- Content Engine Asset session: 8 tests passed.
- CLI documentation tests: 14 tests passed.
- MCP docs generator: 3 tests passed.
- Content Engine, Project Build, CLI, and MCP docs typechecks passed.
- `pnpm oxfmt --check` passed.
- `git diff --check` passed.
- Low-reasoning MCP evaluation passed all documented workflows,
including a real two-client revision conflict, reload, reapply, and
final saved inspection.
2026-08-31 18:39:05 +02:00

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---
description: Query Markdown, MDX, and JSON Assets with the Content Engine.
---
<!-- Generated from the Content Engine schemas and shared CLI documentation. Do not edit directly. -->
{{reference}}
## Related
- [Content Engine](content-engine.md) – Build a file-based blog in the visual editor
- [Assets](assets.md) – Create and organize project files
- [Webstudio MCP](../mcp.md) – Let an AI agent build and inspect a project
- [Data variables](variables.md) – Define resources and understand their scope
- [Collection](../core-components/collection.md) – Render a query result as repeated content