changeset: release polyglot tool-span parity

[brentrager]

Releases #490. Fifth PR in a row on this ticket to merge without a changeset (#470, #471, #474, #488, #490) — see the note below on closing that loop.

What #490 fixes

All four non-Rust engines omitted gen_ai.system from the tool span, so OTLP consumers that gate on it — SmooAI's does — discarded every tool span those engines ever emitted, identically to the Rust engine. Each now carries its own gen_ai.system, gen_ai.operation.name (literally chat/tool, taken verbatim by ingest), gen_ai.conversation.id, and smooai.org_id. Child spans need their own copies: ingest merges resource attributes with that span's attributes, with no parent inheritance.

Cost reaches the span for the first time in all four, with a gateway zero recorded as cost_unavailable = "unpriced" rather than as a cost — unpriced is not free.

Two more fabricated values, removed rather than ported

• .NET returned a literal TurnUsage(0, …) on the cost fallback, under an XML doc reading "0 means 'nothing priced it', not 'free'". The comment was right; the code shipped the zero anyway.
• .NET published input_tokens = 0 by guarding on sawUsage alone — a usage chunk with null counts sets that flag while both totals collapse to 0 via ?? 0. The other three guard on the counts.

That makes six such values found today. The consistent tell: the comment is accurate about the mechanism and silent about the consequence.

Worth closing the changeset loop

Anchor Guard already runs on every PR and checks that a changeset names the right package. It just doesn't check one exists for a PR touching published trees. Same script, one condition wider — and it would have caught all five.

🤖 Generated with Claude Code

https://claude.ai/code/session_01LkCz96UfUxcai5RU4LwPnG

[changeset-bot]

🦋 Changeset detected

Latest commit: 59275ed

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@smooai/smooth-operator	Patch
@smooai/smooth-operator-web-chat-example	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR