Repro Error: 'jsonSchema not initialized' when calling mcp.getAITools()

[jldec]

After upgrading to the latest version of the cloudflare agents SDK, I noticed the error below intermittently.
This PR disables the workaround, which avoids calling this.mcp.getAITools() on the agent, when there are no MCPs.

To try to repro

• clone and checkout this branch
• pnpm install
• set OPENAI_API_KEY in .dev.vars
• pnpm dev
• open browser on http://localhost:5173/chat-agent-agent (or click on 6. Agent Agent Chat on the home page)
• enter prompts: "what is the time", "test", "test 2"
• if you don't see the error, wait a minute, then try one of the prompts again

Chat message request
mcpServers { prompts: [], resources: [], servers: {}, tools: [] }
Error on server: Error: jsonSchema not initialized.
    at MCPClientManager.getAITools (/Users/jldec/cloudflare/redwood/agents-chat/node_modules/.vite/deps_worker/chunk-UBIZWKXI.js:2263:33)
    at ChatAgentAgentDO.onChatMessage (/Users/jldec/cloudflare/redwood/agents-chat/src/app/chat-agent-agent/ChatAgentAgentDO.ts:26:19)
    at /Users/jldec/cloudflare/redwood/agents-chat/node_modules/.vite/deps_worker/agents_ai-chat-agent.js:168:32
Override onError(error) to handle server errors