Upgrade MCP C# SDK to v2

[niemyjski]

What changed

• Upgrade ModelContextProtocol.AspNetCore from 1.4.1 to 2.0.0.
• Use the SDK v2 native stateless HTTP transport and protocol 2026-07-28.
• Preserve SDK-supported down-level protocol negotiation for 2025-06-18 and 2025-11-25 clients.
• Remove the legacy stateful session migration handler and all OAuth-grant-scoped mutable project context.
• Define the initial MCP tool contract around stateless, unambiguous scope inference: organization and project ids may be omitted when the current OAuth grant exposes exactly one matching resource; otherwise tools return structured context_required guidance.
• Simplify discovery to list_organizations, list_projects, and resolve_project; remove get_context and the state-implying switch_organization and switch_project tools.
• Add server instructions explaining that calls are stateless, omitted ids are inferred only when unambiguous, and previous calls never change later scope.
• Add the required v2 Mcp-Method and Mcp-Name authorization metadata headers to the HTTP samples.

Compatibility and risk

This MCP tool surface has not been released, so optional identifiers with unambiguous inference and structured selection errors are the initial supported tool contract rather than a change to an existing public contract. Explicit ids remain supported and are required whenever the OAuth grant exposes multiple matching resources. Older clients dynamically discover that schema.

Wire-protocol compatibility remains preserved for current down-level MCP clients. The server negotiates 2025-06-18, 2025-11-25, and native 2026-07-28; the Exceptionless REST API is unchanged.

Version 2.0.0 was released on July 28, 2026, so it is less than two weeks old and carries elevated dependency-upgrade risk. No known NuGet vulnerabilities were reported for the solution's resolved packages.

Release audit:

• Announcement
• v2.0.0 release
• v1.4.1...v2.0.0 comparison
• SDK security advisories

Verification

• dotnet build tests/Exceptionless.Tests/Exceptionless.Tests.csproj --no-restore --nologo — passed, 0 warnings/errors.
• git diff --check — passed.
• Added tool-schema coverage proving organization and project ids are optional.
• Added behavior coverage for a single organization, a single project, a single project across multiple organizations, ambiguous project grants, and both query and resource lookup paths.
• Added tool-list coverage for the simplified stateless discovery surface and server instructions.
• Added official SDK integration coverage for native 2026-07-28 and down-level 2025-06-18 and 2025-11-25 negotiation.
• Focused local integration execution was blocked before tests ran because the shared Elasticsearch 8.19 container found data written by a newer Lucene/Elasticsearch version (indexCreatedVersionMajor is in the future: 10) and exited during fixture startup; GitHub Actions runs the clean integration suite for the pushed commit.

[chatgpt-codex-connector]

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[niemyjski]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Another round soon, please!

Reviewed commit: 7fe332781b

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[chatgpt-codex-connector]

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[ejsmith]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Bravo.

Reviewed commit: b7443100b3

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[github-actions]

Package	Line Rate	Branch Rate	Complexity	Health
Exceptionless.Core	74%	66%	9634	➖
Exceptionless.AppHost	38%	40%	139	❌
Exceptionless.Insulation	37%	35%	286	❌
Exceptionless.Web	85%	68%	6887	✔
Summary	77% (22902 / 29705)	66% (10571 / 16030)	16946	✔