Migrating from v5 to v6

v6 is a small, mechanical upgrade. The bulk of it is the Go module path; the behavioral changes are two, both with a one-line fix.

1. Module path: go-micro.dev/v6

Go puts the major version in the import path, so every import changes:

// before
import "go-micro.dev/v5"
import "go-micro.dev/v5/server"

// after
import "go-micro.dev/v6"
import "go-micro.dev/v6/server"

A repo-wide find/replace does it:

grep -rl 'go-micro.dev/v5' --include='*.go' . \
  | xargs sed -i 's|go-micro.dev/v5|go-micro.dev/v6|g'
go mod tidy

Update the CLI too:

go install go-micro.dev/v6/cmd/micro@v6

2. TLS is verified by default

In v5, TLS certificate verification was off by default (you opted in with MICRO_TLS_SECURE=true). In v6 it is on by default — the safe choice now that an agent, not just a human on a trusted network, can reach an endpoint.

• Production: nothing to do. Verification is on.
• MICRO_TLS_SECURE is gone — remove it; it’s the default now.
• Self-signed certs (local/dev): opt out with MICRO_TLS_INSECURE=true, or call tls.InsecureConfig() directly.

3. NewService is the service constructor

The service constructor is now symmetric with NewAgent and NewFlow:

service := micro.NewService("greeter", micro.Address(":8080"))
agent   := micro.NewAgent("task-mgr", micro.AgentServices("task"))
flow    := micro.NewFlow("onboard", micro.FlowTrigger("events.user.created"))

• micro.New("greeter", ...) still works as a deprecated alias — no rush, but prefer NewService.
• The old name-less form micro.NewService(micro.Name("greeter"), ...) is removed; pass the name positionally: micro.NewService("greeter", ...).

Generated services already use NewService — re-running micro new or micro run --prompt emits the v6 form.

That’s it

No other API changed. Agents, services, flows, the registry/broker/store interfaces, MCP, A2A, and x402 all work as they did — just under go-micro.dev/v6 and secure by default.