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Exceptionless 8.6.0

Exceptionless 8.6.0 is headlined by the new hosted MCP server. This release gives AI tools a first-class, authenticated way to work with Exceptionless data directly from the existing application, making it possible to ask questions about projects, stacks, events, counts, and release windows without building one-off scripts or copying data out of Exceptionless.

The MCP server is available at /mcp and is backed by OAuth-based authorization, structured tool errors, scoped read access, and optional stack write permissions. It is designed to let connected tools inspect production error data safely while still supporting real operational workflows such as marking stacks fixed, snoozing noisy stacks, updating critical status, and managing reference links when the client has explicitly requested the required write scope.

This release also carries forward the large 8.6 modernization work from the release candidates: the move from JSON.NET to System.Text.Json, continued Elasticsearch client modernization, better event and stack paging performance, Aspire development improvements, saved view reliability fixes, and React Native setup documentation.

MCP Server

The new hosted MCP server is the major addition in 8.6.0.

  • Adds /mcp inside the Exceptionless web app so MCP clients can connect to the user's own Exceptionless instance.
  • Exposes read tools for projects, stacks, project-wide events, stack events, event details, event counts, grouped event counts, and supported filter metadata.
  • Adds bounded grouped event counts for approved dimensions such as version, tag, stack, user, and error type, making it easier to answer questions like whether errors changed after a release.
  • Supports scoped stack write tools for updating stack status, marking stacks fixed with a version, snoozing stacks, controlling future critical status, and adding or removing reference links.
  • Adds OAuth authorization for MCP clients, including authorization code with PKCE, refresh and revoke support, protected resource metadata, Dynamic Client Registration, and CIMD client discovery.
  • Stores MCP OAuth client applications in Elasticsearch and adds management in the new Svelte system settings UI, including the optional stacks:write scope.
  • Returns structured MCP errors for invalid filters, invalid sorts, invalid cursors, invalid write inputs, and missing-scope forbidden cases.

Platform Modernization

8.6.0 includes a major internal migration from JSON.NET to System.Text.Json across the codebase. Serialization is involved in events, stacks, API contracts, storage, jobs, configuration, and many other parts of Exceptionless, so this is an important foundation for future performance, compatibility, and maintenance work.

The release also continues the long-running Elasticsearch client modernization effort and includes dependency updates across Aspire, .NET, frontend packages, and supporting libraries.

UI And Reliability

  • Improves event and stack paging totals to reduce expensive count operations on large datasets.
  • Fixes saved view creation so newly-created saved views no longer navigate to a transient 404 while Elasticsearch catches up.
  • Improves saved view deletion handling and legacy saved-view slug fallback behavior.
  • Renames the visible free-form filter UI from Keyword to Raw Filter to better describe advanced expressions such as user:usera OR user:userb.
  • Adds React Native configuration documentation.
  • Improves Aspire and local worktree development workflows.

What's Changed

Full Changelog: https://github.com/exceptionless/Exceptionless/compare/v8.5.2...v8.6.0

Upgrading

The only users who need to take upgrade action are self-hosted Exceptionless users.

If you are self-hosting Exceptionless, review the Self Hosting Documentation before upgrading. It contains the information needed to upgrade an existing installation safely.

As always, review the full changelog for the complete list of changes.

Breaking Changes

None.

Thanks

Thank you to everyone in the community, our contributors, and our project sponsors for continuing to support Exceptionless.

Source: README.md, updated 2026-06-26