[FEATURE] Let Claude Web Cross-Validate Claude Code's Work — Closing the Last Two Gaps in the Agent Ecosystem

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

I run 5+ concurrent projects with Claude Code (crypto trading bot, stock scanner, healthcare app, manufacturing SaaS, etc.) and use Claude Web (Opus 4.6) for strategy, spec writing, and cross-validation.

Two critical gaps exist:

1. Claude Web cannot see Claude Code's local projects. When Claude Web writes an 18-page MVP spec and Claude Code builds the app in under an hour, I can't have Claude Web verify the implementation without screenshots and copy-paste. Builder ≠ Reviewer, but they can't see each other's work. Remote Control continues the SAME session — I need a DIFFERENT persona reviewing the same code.

1. No cross-project shared context. Each Claude Code instance starts cold. Validated patterns from one project can't flow to another without burning tokens re-explaining everything. Cowork sees one folder. MCP connects one scope. Nothing bridges multiple projects.

Proposed Solution

Gap 1: Claude Web local project read access (read-only)

• Claude Web can read a designated project folder on the local machine
• Acts as an independent reviewer/strategist for Claude Code's work
• Different analytical lens than the builder — cross-validation within Anthropic ecosystem

Gap 2: Cross-project shared workspace

• A designated shared folder recognized by all Claude Code instances AND Claude Web
• Auto-discovery: new projects scan shared catalog for relevant patterns
• Auto-cataloging: reusable patterns get offered for addition to shared catalog
• Verification status propagation: production-verified in one project → visible everywhere
• Token-efficient by design: summary + pointer architecture (not full code duplication)

Alternative Solutions

I've already built workarounds for both gaps:

For Gap 1: Screenshots → upload → copy-paste code into Claude Web chat → incomplete context → manually relay feedback to Claude Code. Costs ~30% of my review time.

For Gap 2: I built a "Porting Library" in under 20 days — a cross-project pattern catalog with 31 documented patterns (3,364 lines), including a FOR_OTHER_CLAUDE.md file that serves as a hand-crafted protocol for other Claude Code instances. Each pattern has: core concept summary, minimal code snippet, source path pointer, porting notes, and verification status tags ([Production-Verified], [Prototype], [Idea]).

This works but requires manual maintenance and doesn't connect to Claude Web.

Priority

High - Significant impact on productivity

Feature Category

MCP server integration

Use Case Example

Real scenario from today:

1. Claude Web researches Korean healthcare policy (Integrated Care Act, March 2026) + Samsung Health Data SDK architecture
2. Claude Web creates 18-page MVP specification for "SeniorBit" elderly care app
3. I hand the spec to Claude Code → it builds a working Android app with SDK integration in <1 hour
4. I want Claude Web to verify: Do data models match the spec? Is the 4-stage alert protocol implemented correctly?
5. CURRENT: Screenshot → upload → incomplete review → manual relay. Painful.
6. IDEAL: Claude Web reads the project folder, compares against its own spec, gives architectural feedback. Done.

Cross-project scenario:

1. The websocket_reconnect pattern from my crypto bot is needed in SeniorBit for real-time health data
2. CURRENT: I manually point Claude Code to my Porting Library folder, it reads the .md summary, follows the source path
3. IDEAL: Claude Code auto-discovers relevant shared patterns when starting SeniorBit development

Additional Context

About me: 48-year-old freelance injection mold designer from South Korea, 23 years experience, zero formal programming background. Used all 4 major AI platforms (ChatGPT, Gemini, Grok, Perplexity) for 1 year before switching to Claude 3 weeks ago. Claude Max x20 subscriber.

I've been watching Anthropic's direction:

• Cowork (Jan 2026) — local filesystem for non-coding. Brilliant.
• Remote Control (Feb 2026) — Claude Code from anywhere. Exactly right.
• MCP Filesystem — structured local access. Solid foundation.
• Claude Code Sandboxing — safe autonomous work. Smart.

The direction is correct. These two gaps are what's left.

My Porting Library structure (built independently in <20 days):

• 31 patterns across: trading signals, AI pipelines, WebSocket, UI themes, infrastructure, manufacturing-specific parsers
• FOR_OTHER_CLAUDE.md — cross-instance protocol
• README.md — categorized catalog with verification status tags
• Used across: crypto bot, stock scanner, healthcare app, manufacturing SaaS

Willing to beta test with my multi-project environment.