Missing zod dependency - agent fails to start after every install/update

[OhThatMatt]

Summary

The agent fails to start after every install or update. Zed shows:

Internal error: "server shut down unexpectedly"

Cause

@agentclientprotocol/sdk@0.14.1 declares zod as a peer dependency:

"peerDependencies": {
  "zod": "^3.25.0 || ^4.0.0"
}

But claude-agent-acp doesn't include zod in its own dependencies to satisfy it. When Zed installs the agent, zod ends up missing from node_modules:

WARN  [agent_servers::acp] agent stderr: Error [ERR_MODULE_NOT_FOUND]: Cannot find package 'zod' imported from
  ~/Library/Application Support/Zed/external_agents/claude-agent-acp/0.19.2/node_modules/@agentclientprotocol/sdk/dist/acp.js

Suggested Fix

Add zod as a direct dependency in package.json:

"dependencies": {
  "@agentclientprotocol/sdk": "0.14.1",
  "@anthropic-ai/claude-agent-sdk": "0.2.62",
  "zod": "^4.0.0"
}

Workaround

cd ~/Library/Application\ Support/Zed/external_agents/claude-agent-acp/0.19.2
npm install zod

Has to be repeated after every update.

Environment

• Agent version: 0.19.2
• Node: v22.16.0
• OS: macOS