[release] Release Highlights: v0.3.22

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🌟 Release Highlights

This release focuses on internal code quality improvements — refactoring duplicated logic, hardening validation diagnostics, and expanding test coverage — keeping MCP Gateway lean and maintainable.

⚡ Improvements

• Hardened JSON schema validation (Harden jsonschema/v5 validation diagnostics and remote schema fetching #6747): jsonschema/v5 validation now produces richer diagnostics and handles remote schema fetching more robustly, giving clearer error messages when configuration schemas fail to validate.
• Enhanced debug logging ([log] Add debug logging to jq middleware filter functions #6715): jq middleware filter functions now emit structured debug logs, making it easier to trace payload transformations when DEBUG=* is enabled.

🔧 Internal Refactoring

A focused round of code-quality improvements with no user-facing behavior changes:

• Eliminated duplicated DIFC tag parsing across WASM response handling (Refactor duplicated DIFC tag parsing in WASM response handling #6748, [Repo Assist] refactor(guard): extract parseDIFCTagsFromAny helper in wasm_parse.go #6743)
• Restored clean package boundaries for DIFC/guard helpers (Refactor DIFC/guard helper ownership to restore package boundaries #6749)
• Centralized logger level wrapper registration (Centralize logger level wrapper registration #6752)
• Deduplicated MCP handler config setup across transport and routed server paths (Refactor duplicated MCP handler config setup in transport and routed server paths #6753)
• Deduplicated owner/repo/number parsing in the REST backend caller (Refactor duplicated owner/repo/number parsing in REST backend caller #6751)

🧪 Test Coverage

• Added tests for envutil.deriveAPIFromServerURL covering HTTP scheme and edge cases ([test] Add tests for envutil.deriveAPIFromServerURL — http scheme and edge cases #6708)
• Expanded tracing package test coverage ([test-improver] Improve tests for tracing package #6716)
• Added explicit sub_issue_write read-write classification test for guards (Guard coverage: add explicit sub_issue_write read-write classification test #6710)

📚 Documentation

• Corrected the default path for MCP_GATEWAY_WASM_CACHE_DIR in AGENTS.md (Correct AGENTS.md default path for MCP_GATEWAY_WASM_CACHE_DIR #6750)

🐳 Docker Image

The Docker image for this release is available at:

docker pull ghcr.io/github/gh-aw-mcpg:v0.3.22
# or
docker pull ghcr.io/github/gh-aw-mcpg:latest

Supported platforms: linux/amd64, linux/arm64

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For complete details, see the full release notes.

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