Expose token usage from openAIResponsesAdapter

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@justonemorenight is already working on this.

Since Sep 10, 2026.

  • #1147 by @justonemorenight — open

Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
25/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Stale
Tech stack
typescript
Domain
api

Research direction

Start by locating openAIResponsesAdapter and reading how it handles streamed response events. Check how response.completed exposes response.usage, then compare the adapter with the referenced openAIResponseAdapter. Done means an optional onUsage callback receives input_tokens, output_tokens, and total_tokens; an open pull request is already linked to this issue.

Written by the indexing model from the issue text.

Description

Is your feature request related to a problem? Please describe.
openAIResponsesAdapter() currently ignores response.completed, including response.usage.

Describe the solution you'd like
Could the adapter expose an optional callback?

openAIResponsesAdapter({
onUsage: (usage) => {
// input_tokens, output_tokens, total_tokens
},
});
This would let applications display token usage or estimated remaining context without implementing a custom stream adapter.

Describe alternatives you've considered
Local adapter that wraps/forks openAIResponseAdapter

Additional context
This would help implement a context available/used counter in the composer

Dominant language
TypeScript
Stars
10k
Forks
698
Avg merge
1d 3h
Merged PRs (30d)
133

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