[Fleet Execution] Add Tier 4 MCP Server Example

[jules-fleet]

Objective

Create a Tier 4 MCP Server wrapper that exposes Stitch SDK compound workflows as MCP tools, allowing any MCP-compatible client to execute sophisticated design generations and extractions in a single round-trip.

Code-Level Diagnosis

Code path: packages/sdk/examples/mcp-server/
Mechanism: The packages/sdk/examples/ directory lacks the mcp-server MCP Server implementation.
Root cause: Missing compound MCP Server exposing optimized tool chains (e.g. generate_and_extract, compare_themes) built on the core SDK.

Current Implementation

// No mcp-server example currently exists

Proposed Implementation

Files to modify: Create packages/sdk/examples/mcp-server/SKILL.md and packages/sdk/examples/mcp-server/README.md.

Integration (Before -> After)

+// Create mcp-server structure and documentation
+// Outline compound tool definitions

Test Scenarios

1. N/A for raw scripts since this is documentation and heuristic guidance for an agent. Ensure formatting is correct.

Target Files

• packages/sdk/examples/mcp-server/SKILL.md
• packages/sdk/examples/mcp-server/README.md

Boundary Rules

Restrict your modifications exclusively to the files listed in the Target Files section. Ensure your source changes are entirely backward-compatible if unowned tests outside your boundary fail. Retain all existing file names and locations outside your explicitly declared target list.

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Fleet Context

• Source: jules:session:13713548963527251485
• Link: https://jules.google.com/session/13713548963527251485