Add MCP support (#1028)

e2e-tests/snapshots/mcp.spec.ts_mcp---call-calculator-1.aria.yml

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+- paragraph: "[call_tool=calculator_add]"
+- img
+- text: Tool Call
+- img
+- text: testing-mcp-server calculator_add
+- img
+- text: less than a minute ago

e2e-tests/snapshots/mcp.spec.ts_mcp---call-calculator-1.txt

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+===
+role: system
+message: 
+You are an AI App Builder Agent. Your role is to analyze app development requests and gather all necessary information before the actual coding phase begins.
+
+## Core Mission
+Determine what tools, APIs, data, or external resources are needed to build the requested application. Prepare everything needed for successful app development without writing any code yourself.
+
+## Tool Usage Decision Framework
+
+### Use Tools When The App Needs:
+- **External APIs or services** (payment processing, authentication, maps, social media, etc.)
+- **Real-time data** (weather, stock prices, news, current events)
+- **Third-party integrations** (Firebase, Supabase, cloud services)
+- **Current framework/library documentation** or best practices
+
+### Use Tools To Research:
+- Available APIs and their documentation
+- Authentication methods and implementation approaches  
+- Database options and setup requirements
+- UI/UX frameworks and component libraries
+- Deployment platforms and requirements
+- Performance optimization strategies
+- Security best practices for the app type
+
+### When Tools Are NOT Needed
+If the app request is straightforward and can be built with standard web technologies without external dependencies, respond with:
+
+**"Ok, looks like I don't need any tools, I can start building."**
+
+This applies to simple apps like:
+- Basic calculators or converters
+- Simple games (tic-tac-toe, memory games)
+- Static information displays
+- Basic form interfaces
+- Simple data visualization with static data
+
+## Critical Constraints
+
+- ABSOLUTELY NO CODE GENERATION
+- **Never write HTML, CSS, JavaScript, TypeScript, or any programming code**
+- **Do not create component examples or code snippets**  
+- **Do not provide implementation details or syntax**
+- Your job ends with information gathering and requirement analysis
+- All actual development happens in the next phase
+
+## Output Structure
+
+When tools are used, provide a brief human-readable summary of the information gathered from the tools.
+
+When tools are not used, simply state: **"Ok, looks like I don't need any tools, I can start building."**
+
+
+===
+role: user
+message: [call_tool=calculator_add]
+
+===
+role: assistant
+message: <dyad-mcp-tool-call server="testing-mcp-server" tool="calculator_add">
+{"a":1,"b":2}
+</dyad-mcp-tool-call>
+<dyad-mcp-tool-result server="testing-mcp-server" tool="calculator_add">
+{"content":[{"type":"text","text":"3"}],"isError":false}
+</dyad-mcp-tool-result>
+
+  <dyad-write path="file1.txt">
+  A file (2)
+  </dyad-write>
+  More
+  EOM
+  <dyad-write path="file1.txt">
+  A file (2)
+  </dyad-write>
+  More
+  EOM
+
+===
+role: user
+message: [dump]