usage
A Claude Code settings key, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.
SDK result fields now explain that usage covers only the main loop and costs are estimates.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.223.
In the changelogs
10Releases whose published page names usage.
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v2.1.280
Compaction record now carries explicit usage stats
Compaction records now include detailed token usage stats, not just before/after totals
found in this entry's text
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v2.1.280
Token usage now attached to conversation messages and compaction records
Token usage data is now attached to conversation messages and compaction records
found in this entry's text
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v2.1.280
Task delegation now carries usage stats forward
Sub-task handoff now carries forward token, tool-use, and duration stats
found in this entry's text
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v2.1.273
Session usage totals now take the max of two token counts
Session usage totals now use whichever of two token counts is higher
found in this entry's text
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v2.1.267
Compaction request now stamps usage onto turn.complete when available
The turn-complete event now includes a computed usage figure whenever one is available
found in this entry's text
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v2.1.267
Plugin event schema gains a
usagefield on turn.step and turn.completePlugin turn.step and turn.complete events now include token usage details
named in this entry, found in this entry's text
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v2.1.267
turn.step and turn.complete telemetry events now include usage data
Two internal telemetry events now include usage data like token counts when available
found in this entry's text
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v2.1.260
Fixed agent_empty_result counting for workflow agents
Fixed a wrong empty-result count shown in the subagent usage summary.
found in this entry's text
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v2.1.259
Database write tool results now report usage
Artifact database write results now include a usage field, echoed into the confirmation text shown to the model.
found in this entry's text
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v2.1.223
SDK result schema documents what usage, total_cost_usd and modelUsage actually cover
SDK result fields now explain that usage covers only the main loop and costs are estimates.
found in this entry's text
First cited
0No release's published evidence quotes this name. The ledger indexes the Evidence lines of every changelog on this site, so this says nobody here has ever quoted it; it says nothing about how old the name is.
Presence across releases
0The miner has never read a build containing this name. It is here because a changelog entry of ours names it, which is evidence that it existed and not evidence of which releases carried it. The inventory starts at v2.1.138 and everything older than that was never mined.
Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the settings key does. All settings keys.