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Nexus 0.5.3

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@github-actions github-actions released this 24 Sep 15:47
· 55 commits to main since this release
0.5.3
2042565

Nexus 0.5.3 - September 24, 2025

Summary

This patch release focuses on improving observability and telemetry, fixing a critical issue with Anthropic Claude's tool result handling, and enhancing the startup logging experience. The release also includes a dependency update for the MCP client library.

Bug Fixes

Fixed Duplicate Tool Results in Anthropic Claude Responses

Issue: When using Claude models through the Anthropic provider, tool call results followed by text content were being duplicated in the response stream, causing confusing output for users.

Resolution: Improved the message conversion logic in the Anthropic provider to correctly handle mixed tool results and text content without duplication.

Technical Details:

  • Modified the unified-to-Anthropic message conversion in crates/llm/src/messages/unified/to_anthropic.rs
  • Updated input processing in crates/llm/src/provider/anthropic/input.rs

Fixed Telemetry Child Span Sampling Issue

Issue: Child spans were being sent to the telemetry collector even when their parent span was not sampled, causing unnecessary overhead and confusing trace data.

Resolution: Implemented proper span sampling inheritance to ensure child spans respect parent sampling decisions.

Technical Details:

  • Enhanced tracing logic in multiple components to check parent span sampling status
  • Added new utility function in crates/telemetry/src/tracing.rs for consistent sampling behavior
  • Updated tracing implementations across LLM, MCP, and rate-limit crates

Restored Nexus Version Logging at Startup

Issue: The Nexus version was not being logged at startup, making it difficult to identify which version was running in production environments.

Resolution: Moved version logging to immediately after logger initialization in the server crate, ensuring it's the first informational message users see.

Technical Details:

  • Moved version logging from nexus/src/main.rs to crates/server/src/lib.rs
  • Added version field to ServeConfig struct for proper version passing
  • Updated integration tests to handle the new version parameter
  • Ensures consistent version logging across all deployment scenarios

Dependency Updates

Updated RMCP Client Library

Change: Updated the rmcp crate from version 0.6.x to 0.7.0

Impact: This update brings improvements to the MCP (Model Context Protocol) client implementation, potentially including bug fixes and performance enhancements for downstream MCP server connections.

Deployment Notes

This is a patch release with no breaking changes. The update can be deployed directly without any configuration changes or migration steps.

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