Feature Request: Add support for Agent Client Protocol (ACP)

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

Please see https://github.com/anthropics/claude-code/issues/6686. Ideally, that ticket should be re-opened and flagged to remain open, as it is one of the most popular feature requests in this project.

Proposed Solution

Implement the feature, per https://github.com/anthropics/claude-code/issues/6686.

Alternative Solutions

_No response_

Priority

High - Significant impact on productivity

Feature Category

MCP server integration

Use Case Example

_No response_

Additional Context

https://github.com/anthropics/claude-code/issues/6686