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Sweep 08 Oct 2026 · 18:53Z Build v2.1.295 516 read Stable v2.1.286 Latest v2.1.295 Next v2.1.295 Feeds RSS JSON llms.txt llms-full.txt Unofficial
Home / Reference / Settings keys

isDeferred

setting never mined JSON

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.

Context-usage accounting now splits deferred MCP and system tool buckets more precisely.

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.260.

First seen — never in a mined build
Last seen — never in a mined build
Builds0 / 138on this box, as of v2.1.295
Written about v2.1.260 first named in a changelog, 3 Sep 2026

In the changelogs

4

Releases whose published page names isDeferred.

  1. v2.1.293
    Mods can register tools that load only when needed

    Tools registered by a mod with $.tool.register can now be marked as deferred with an isDeferred true or false option

    named in this entry, found in this entry's text

  2. v2.1.293
    Plugins can mark the tools they register as deferred

    A tool registered by a plugin through $.tool.register can now carry isDeferred, which must be true or false

    named in this entry, found in this entry's text

  3. v2.1.271
    /context data now exposes deferred/loaded flags and richer breakdown

    /context data sent to plugins now includes deferred and loaded status flags plus a richer breakdown

    found in this entry's text

  4. v2.1.260
    Context-window breakdown now separates 'System tools (deferred)' bucket sizing more precisely

    Context-usage accounting now splits deferred MCP and system tool buckets more precisely.

    found in this entry's text

First cited

4

The earliest release whose published evidence quoted isDeferred was v2.1.271, 14 Sep 2026. That is the oldest release this project wrote about it, so it is a floor on the name's age and not the release that introduced it. It is not a presence reading: which builds carried the name is the table below.

ReleaseDateThe span that was quoted
v2.1.27114 Sep 2026isDeferred: pe = !1
v2.1.2937 Oct 2026$.tool.register takes { name, description, inputSchema?, isDeferred? }; name is letters, digits, _ or - (up to 64)
v2.1.2937 Oct 2026isDeferred is true or false
v2.1.2937 Oct 2026isDeferred must be true or false

Presence across releases

0

The 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.

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