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Claude Code v2.1.117 ·

/fork Command

Entry
JSON All of v2.1.117
EntryKind: in v2.1.117,
ChangesSection of the release
What

Spawn a background agent fork that inherits the full conversation context and executes a specific directive independently.

Usage
/fork <directive>
Details
  • The fork receives the parent conversation's full history as read-only reference context
  • Each fork executes ONE directive, then stops — it is not a continuation of the parent
  • Fork prompts should be specific directives about what to do, not descriptions of the situation
  • The fork agent name is auto-generated from the first few words of the directive
  • Requires at least one conversation turn before forking (you'll see "Cannot fork before the first conversation turn" if attempted too early)
  • Controlled by the tengu_copper_fox feature flag or CLAUDE_CODE_FORK_SUBAGENT environment variable
Evidence

Fork command handler (search for "Usage: /fork") — mp1 at line ~548474; fork spawner _n7 at line ~548333

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Read from
Feature flag
tengu_copper_fox Off in both readings

The flag server returned off for the account this site reads and for the anonymous baseline. A reading of off cannot rule out a rollout these two readings sit outside of.

This account: off · anonymous baseline: off · compiled default in v2.1.117: no gate table built for this version

These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.

Read once, for one account on one subscription tier, against v2.1.117. It isn't a statement about your account. What a flag value here can and cannot tell you

What has happened since
Flag reading moved The flag server now returns off for tengu_copper_fox, read as this account. A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.
Flag reading moved The flag server now returns nothing at all, having stopped carrying it for tengu_copper_fox, read as this account. A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.

See this across every release →

How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's release notes agreeForked subagents can now be enabled on external builds by setting CLAUDE_CODE_FORK_SUBAGENT=1

See this entry in the whole of v2.1.117 →

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