Surface server-level instructions in MCP tool discovery

[gikasivi-ms]

What

Adds an optional instructions property to MCPServerConfig and populates it in the tool-discovery parsers (ParseServerConfig for the tooling-gateway path and ParseServerConfigFromManifest for the local manifest path). When a discovery response declares per-server instructions, the value now flows through ListToolServersAsync and EnumerateToolsFromServersAsync to callers. Servers that declare no instructions leave the property null.

Why

Discovery already carries other server-level metadata (scope, audience, publisher), but drops instructions. Consumers that build agent/tool prompts from discovered servers had no way to read server-authored usage guidance even when the server provided it.

Scope / compatibility

• Purely additive: one new nullable property; no signature changes on the interface.
• Existing servers are unaffected (absent field deserializes to null).
• Both discovery paths (gateway + manifest) handled for parity.

Tests

• ListToolServersAsync_GatewayResponseWithInstructions_PopulatesInstructions
• ListToolServersAsync_GatewayResponseWithoutInstructions_LeavesInstructionsNull

Validation

• Microsoft.Agents.A365.Tooling builds 0 warnings / 0 errors.
• Microsoft.Agents.A365.Tooling.Tests: 23/23 pass; Microsoft.Agents.A365.Tooling.Core.Tests: 76/76 pass.
• dotnet format clean on changed lines.

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[Copilot]

Pull request overview

Adds support for surfacing per-server natural-language instructions from MCP server discovery metadata through the Tooling core model so consumers can incorporate server-authored guidance when building prompts/tool usage flows.

Changes:

• Added nullable instructions to MCPServerConfig.
• Updated both gateway and local-manifest parsing paths to read "instructions" from discovery JSON and populate it on returned server configs.
• Added unit tests covering gateway discovery responses with/without instructions.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/Tooling/Core/Services/McpToolServerConfigurationService.cs	Parses optional "instructions" from gateway and manifest JSON and populates MCPServerConfig.instructions.
src/Tooling/Core/Models/MCPServerConfig.cs	Introduces instructions as new nullable server-level metadata with XML docs.
src/Tests/Microsoft.Agents.A365.Tooling.Tests/Services/McpToolServerConfigurationServiceTests.cs	Adds gateway-path tests validating instructions is populated or left null.