MCP - Prompt infra

[zamoore]

📌 Summary

If merged, this PR adds MCP prompt-registration infrastructure and wires it into server startup.

🛠️ Detailed description

• Adds registerPrompts(server) in packages/mcp/src/prompts/index.ts with a central PROMPTS registry (currently empty) and loops through it to register prompts.
• Introduces McpPrompt typing in packages/mcp/src/prompts/types.ts for prompt name/config/callback shape consistency.
• Updates MCP server bootstrap in packages/mcp/src/index.ts to import and invoke registerPrompts(server) before connecting transport.
• No behavior change yet for end users: this is scaffolding to support adding concrete MCP prompts in follow-up PRs.

Copilot instructions

• Confirm prompt registration is initialized at the correct lifecycle point in packages/mcp/src/index.ts.
• Validate McpPrompt type constraints and compatibility with server.registerPrompt(...).
• Check for module-resolution/type import issues in packages/mcp/src/prompts/index.ts and packages/mcp/src/prompts/types.ts.

🔗 External links

Jira ticket: HDS-6501
Figma file: [if it applies]

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👀 Component checklist

• Percy was checked for any visual regression
• A changelog entry was added via Changesets if needed (see templates here)

💬 Please consider using conventional comments when reviewing this PR.

📋 PCI review checklist

• If applicable, I've documented a plan to revert these changes if they require more than reverting the pull request.
• If applicable, I've worked with GRC to document the impact of any changes to security controls.
  Examples of changes to controls include access controls, encryption, logging, etc.
• If applicable, I've worked with GRC to ensure compliance due to a significant change to the in-scope PCI environment.
  Examples include changes to operating systems, ports, protocols, services, cryptography-related components, PII processing code, etc.

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Project	Deployment	Actions	Updated (UTC)
hds-showcase	Ready	Preview	Jul 7, 2026 3:26pm
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[Copilot]

Pull request overview

This PR adds initial scaffolding in the packages/mcp package to support registering MCP prompts at server startup, establishing a typed prompt definition and a centralized registration function.

Changes:

• Introduces a typed McpPrompt interface to standardize prompt name/config/callback shapes.
• Adds a registerPrompts(server) entrypoint with a central PROMPTS registry (currently empty).
• Wires prompt registration into MCP server startup before connecting the stdio transport.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
packages/mcp/src/prompts/types.ts	Adds the McpPrompt type definition for consistent prompt configuration and callback typing.
packages/mcp/src/prompts/index.ts	Introduces a central PROMPTS registry and a registerPrompts function that registers all prompts with the server.
packages/mcp/src/index.ts	Calls registerPrompts(server) during server initialization prior to transport connection.