## Summary
This improves how agents discover, author, inspect, and verify Webstudio
projects while reducing unnecessary MCP context usage.
## What changed
- Adds an **Agents** section to Project Settings with ready-to-run setup
commands and client configuration for Claude Code, Codex, Cursor, and VS
Code.
- Makes large list and schema responses compact and paginated by
default, with **verbose** available when complete records or diagnostics
are needed.
- Applies consistent compact output to assets, instances, styles, design
tokens, CLI schemas, and project-session metadata.
- Returns actionable expression warnings for props, resources, and
Collection bindings, including unknown variables and risky render-time
mutation resources.
- Improves Collection expression guidance so agents can bind array items
with the correct scoped variables.
- Reports rendered audit outcomes explicitly as complete, partial,
confirmation-required, or failed.
- Expands runtime output schemas so MCP clients can validate responses
reliably.
- Strengthens the packaged CLI smoke workflow with a realistic
seven-page stdio MCP scenario.
## Architecture
- Consolidates `project-build` from 65 file-oriented entrypoints to 11
architecture-owned surfaces.
- Separates the core model, contracts, runtime authoring, transfer,
state, project sessions, MCP, visual tooling, persistence codecs, and
authenticated server services.
- Isolates Node-only JSX evaluation from browser-safe transfer utilities
and authenticated server modules.
- Keeps persistence codecs independent from authenticated database
services, preventing unrelated module initialization.
- Defines shared instance-path types once and reuses them across runtime
modules.
- Preserves Immer initialization through explicit package side-effect
metadata.
- Adds package tests that prevent a return to source-file entrypoints or
generic exposure of Node-only surfaces.
## Validation
- Full repository checks, tests, typechecks, generated-file checks, and
fixtures
- All 163 Builder test files and 2,141 tests
- All 71 project-build test files and 1,794 tests
- Lint and package-boundary validation
- Full packed CLI release smoke test, including install, preview, agent
setup, seven-page stdio MCP workflow, rendered audit, and structured
commands
## What changed
- Return structured validation issues with stable codes, complete field
paths, constraints, and minimal correction examples.
- Preserve validation details through the Builder API, CLI, MCP, local
project sessions, and tRPC errors.
- Explain invalid expressions, JSX fragments, page selectors, component
inputs, asset updates, and project settings in terms an agent can act
on.
- Remove stack frames and credentials from parser details before
exposing them.
- Keep concise human-readable errors while making the complete
structured issues available to agents.
## Why
Agents previously received vague errors without enough information to
repair a request. They could repeat the same invalid call or require
manual intervention.
## User impact
CLI and MCP agents can now identify the exact invalid field, understand
the constraint, see a valid example, and retry with a corrected request.
## Validation
- Focused runtime, MCP, CLI, API, and tRPC validation tests.
- Structured error propagation tests across local and server execution.
- Typechecks and generated contract verification.
## What changed
- Add an `insert-collection` MCP and CLI operation for creating repeated
UI from array or object data.
- Create the Collection, iterable binding, current-item/current-key
parameters, repeated item structure, and descendant bindings atomically.
- Accept literal JSON data or expressions backed by project variables
and resource results.
- Support `collectionItem` and `collectionItemKey` expressions inside
the repeated Webstudio JSX item.
- Return the created Collection, item root, and parameter IDs for
immediate inspection and follow-up edits.
- Document when agents should use Collection for lists, grids, cards,
rows, options, tabs, and other repeated content.
## Why
Building a data-driven list previously required several low-level
operations and manual handling of Collection's internal parameters. A
missed step could leave a partially configured or incorrectly scoped
Collection.
## User impact
Agents can turn resource or variable data into a correctly bound
repeated layout in one operation, then inspect and refine the result
normally.
## Validation
- Real-world local CLI test created and rendered a three-product
Collection from project data.
- Tests cover literal arrays, objects, resource expressions, item/key
bindings, malformed fragments, ID conflicts, server execution, and
project-session behavior.
- 176 focused tests, project-build typecheck, and generated-doc checks
pass after rebasing onto current `main`.
Improves CLI and MCP reliability across project synchronization, asset
editing, imports, audits, and clipboard workflows.
## Changes
- Keeps asset filename and description updates after session refresh.
- Prevents intermittent Immer patch errors during consecutive MCP
mutations.
- Prevents false edit conflicts caused by stale local session state.
- Preserves asset uploads without treating them as redundant metadata
updates.
- Exposes editable asset filenames consistently through MCP.
- Imports project assets correctly when copying projects between
environments.
- Supports refreshing partially available project snapshots.
- Keeps MCP operations working when optional project data is
unavailable.
- Produces clearer compatibility errors when the API and CLI versions
differ.
- Makes rendered audits more resilient when individual screenshots fail.
- Prevents rendered audits from hanging while starting browser captures.
- Handles denied clipboard permissions without uncaught browser errors.
- Improves copy and paste reliability for pages, components, styles, and
animations.
## Verification
- Asset uploader tests and typechecking pass.
- Focused asset workflow E2E passes.
- Complete E2E shard 1 passes.
- Realistic MCP subagent test confirms:
- Asset filename and description persist after refresh.
- Consecutive mutations work without manual refresh.
- No Immer patch error occurs.
- No false conflict occurs.
- Original asset values can be restored successfully.
This PR expands Webstudio MCP and CLI into a more complete agent
authoring interface. Agents can discover project capabilities, edit real
Webstudio content, use data/resources, verify visual output, and report
useful issues when workflows fail.
## MCP User Capabilities
- Create, update, duplicate, reorder, and delete pages.
- Create pages from templates and manage reusable page templates.
- Inspect project pages, instances, props, styles, assets, variables,
resources, and metadata.
- Insert Webstudio components and authored JSX fragments into pages.
- Edit text, props, styles, breakpoints, design tokens, and CSS
variables.
- Update page metadata, SEO fields, redirects, marketplace metadata, and
project settings.
- Create and use static data variables.
- Create and use dynamic resources fetched over HTTP.
- Use REST, GraphQL, and built-in system resources in authored pages.
- Bind data variables and resources to visible page content.
- Create resource-backed pages such as sitemap XML, structured SEO data,
and API-driven content sections.
- Preview current project state without requiring a publish step.
- Capture screenshots for visual verification.
- Verify responsive designs across desktop, tablet, and mobile
breakpoints.
- Use screenshot diff and OCR-style checks to inspect rendered output.
- Reset and refresh local MCP project state when needed.
- Discover available CLI/MCP commands from generated manuals.
- Use clearer examples for resources, data variables, JSX authoring,
previewing, and visual checks.
- Read marketplace product metadata without requiring a full project
snapshot.
- Get safer guidance when using low-level patch tools.
- Get a ready-to-copy Discord report template when MCP/CLI behavior is
confusing or broken.
Oleg Isonen