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| blog | What's New in Go Micro: v6.3.15 | /blog/34 | Go Micro v6.3.15 tightens the first-agent on-ramp, adds Anthropic streaming, and hardens plan/delegate plus text tool-call recovery. |
What's New in Go Micro: v6.3.15
July 5, 2026 • By the Go Micro Team
Go Micro v6.3.15 is a small but useful harness release: less friction for the first agent, better streaming provider coverage, and more reliable execution when models and delegates do not behave perfectly.
Anthropic now streams
The Anthropic provider now supports Messages SSE streaming and is registered as a streaming-capable provider. That means Go Micro agents can use Anthropic in the same streaming path as the other streaming-capable providers, with request/response parser coverage and provider capability docs kept in sync.
The first-agent path is easier to start
The on-ramp now has a smallest runnable first-agent example: a mock-model, no-secret agent you can run before adding provider keys. The CLI and docs also point new users toward the maintained first-agent path after scaffold/run milestones, so the next step after a service is clearer: run the example, build the agent, debug it, then walk the 0→hero services → agents → workflows path.
Plan/delegate is more deterministic
Plan/delegate runs got another reliability pass. Completed plan steps are preserved, ordering is guarded, notify-before-completion is required in the flow path, and checkpoint continuation is more stable. These are the kinds of harness fixes that matter when an agent does real work over multiple tool calls instead of just answering a prompt.
Tool-call recovery keeps improving
Provider text tool-call fallback paths now recover more of the awkward cases: tagged calls, Create-suffixed calls, mixed text/tool-call output, and AtlasCloud follow-up calls. The goal is pragmatic: when a weaker or non-standard provider emits something close to a tool call, the harness should still make progress when it can do so safely.
A2A payment groundwork
The A2A gateway now has the shared payment-mandate foundation needed for AP2-style agent payment flows. It is groundwork, not a full product story yet, but it keeps Go Micro's agent interop and paid-tool direction moving together.
Read the changelog
The full release notes are in the CHANGELOG.
Go Micro is an open source agent harness and service framework for Go. Star us on GitHub.