[arifsetiawan]

Code that defines routes now runs unchanged against a shared gateway, and LiteLLM's Router behaves more like LiteLLM's. Before, code tested against the local gateway that defined routes failed at startup once AGENTROUTER_BASE_URL pointed at another gateway.

Changes

• Route code with a gateway set. route() and LiteLLM's Router no longer raise when AGENTROUTER_BASE_URL is set. Nothing is set up on this computer; calls send the route's name to that gateway, whose route of the same name applies, and the SDK warns once. A Router chooses its route name at each call, so one made before the gateway was set still works.
• Export. export_config() names a Router's routes after their group (chat, not router-1a2b3c4d:chat), so a gateway made from it answers to the names code calls. Two routes that would get one name raise BadRequestError.
• Router traffic shares. A group's traffic is shared by weight, rpm or tpm, as LiteLLM's default simple-shuffle does, and fractional weights keep their ratio (0.01 and 100 become 1 and 10000). A routing_strategy other than simple-shuffle, and litellm_params the gateway does not use, now warn.
• api_base. A call with api_base= warns once that it goes to that address in place of the gateway.
• 403 from a gateway you set. A plain-text 403 names AGENTROUTER_API_KEY as a possible cause, without the provider's name in front.
• Cost of an unpriced model. A call to a model without a known price reports response_cost as None and warns nothing, as in LiteLLM. completion_cost() called directly still warns and returns 0.

Docs, both skills and CHANGELOG.md (under Unreleased) are updated.

A second commit moves the macOS gateway build from macos-14, which GitHub no longer runs, to macos-15. Without it the darwin-arm64 wheel is not built and the release cannot publish.

Checks

Check	Result
ruff check, ruff format --check	pass
pytest	409 passed, 9 skipped; every real-aigw test ran
tests/test_adk.py, tests/test_openai_agents.py	5 passed, 4 passed
make apps, make apps-live	142 passed; PASS=11 FAIL=0 on both SDKs
smoke_real, smoke_local_gateway, smoke_routes	PASS=8, PASS=10, PASS=9
smoke_examples	PASS=21; the two framework examples run in their own environments, both pass
smoke_adk_real, smoke_agents_real	PASS=4, PASS=4

An AI tool (Claude Code) was used to write this change and its tests.