[release] v0.3.24 Release Highlights

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🌟 Release Highlights

This release completes the Agent ID rename, introduces a live DIFC diagnostic endpoint, delivers a middleware performance improvement, and fixes a proxy liveness probe regression.

⚠️ Breaking Changes

API key surface fully renamed to Agent ID (#7114, #7159, #7150)

The gateway's "API key" configuration and header have been fully replaced by Agent ID to align with MCP spec terminology:

• api_key / apiKey config fields → use agent_id / agentId
• Session routing header → use X-Agent-ID (previously X-MCP-Agent-ID or API-key variants)

Deprecated compat aliases have been removed. Update config files and client integrations accordingly. See the Configuration Guide for current field names.

✨ What's New

Live DIFC label snapshot via /reflect (#7168)

A new unauthenticated /reflect endpoint is available in both gateway and proxy modes. It returns a real-time snapshot of active DIFC (Decentralized Information Flow Control) labels, enabling quick diagnostics of security label propagation without requiring credentials. See the Guard Response Labeling docs.

⚡ Performance

Middleware fast path for small responses (#7094)

The jq middleware now skips json.Marshal when handling small text responses, reducing CPU overhead and latency for high-frequency lightweight tool calls.

🐛 Bug Fixes

Proxy /rate_limit passthrough restored (#7187)

The /rate_limit endpoint is now correctly forwarded in CLI proxy mode, restoring liveness probe behavior that had been inadvertently blocked.

📚 Documentation

Documentation accuracy improvements (#7102, #7157):

• Corrected ${VAR} expansion scope description
• Added missing internal packages to architecture reference
• Fixed port field description, MCP method names, and tracing variable expansion details

🐳 Docker Image

The Docker image for this release is available at:

docker pull ghcr.io/github/gh-aw-mcpg:v0.3.24
# 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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