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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

Reference / CLI flags

--environment

A Claude Code CLI flag, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.

What it is

Create a new cloud session that runs on the [self-hosted environment](/docs/en/self-hosted-environments) with the given ID. Environment IDs start with ccpool_. See [--environment dispatch behavior](/docs/en/self-hosted-environments-testing#environment-dispatch-behavior) for dispatch behavior and the flag combinations it rejects. Requires Claude Code v2.1.224 or later

Anthropic's own wording. Read off CLI reference, captured 2026-08-28.

Presence across releases

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.

Changelog entries naming it

  1. v2.1.248Cloud and pool flags no longer confuse prompt detection

    Cloud flags like --pool and --ref no longer swallow their values as your prompt.

    named in this entry

  2. v2.1.246Forwarding your home settings to a cloud session now records explicit consent

    Forwarding your home settings to a cloud session now records your consent separately from permission.

    named in this entry

  3. v2.1.232--project no longer starts a cloud session

    Passing --project alone won't start a cloud session; --ref and --on-branch now need --cloud or --environment.

    named in this entry

  4. v2.1.229Whitespace-only prompts are rejected for --cloud and --environment

    Whitespace-only prompts on --cloud and --environment are rejected instead of sent empty.

    named in this entry

  5. v2.1.224"pool" renamed to "environment" in runner flags, old names still work

    Runner "pool" flags are renamed to "environment"; old names still work but warn.

    named in this entry

  6. v2.1.224Create a cloud session without a terminal

    Create a cloud session straight from the command line with --environment and a prompt, optionally as JSON.

    named in this entry

  7. v2.1.224Clearer error when --bg and --environment are combined

    Combining --bg and --environment now explains they are different backends and shows the right command.

    named in this entry

  8. v2.1.224Start a cloud session on a self-hosted environment with --environment

    Start a cloud session on your own environment with claude --environment, plus hidden --ref and --on-branch companions.

    named in this entry

  9. v2.1.224Flag-conflict error names the flag you actually used

    The cloud-session conflict error now blames --environment, the flag you actually typed.

    named in this entry

  10. v2.1.224Local runner spawn writes into ./runner-setup and checks 127.0.0.1:8080

    The setup wizard spawns a detached runner into ./runner-setup and warns it outlives your session.

    named in this entry

  11. v2.1.224cloud CLI: piped stdin no longer silently overrides a task description

    Piped input no longer silently overrides a task description you passed to --cloud.

    named in this entry

Documentation pages

A reference table page is one whose own table defines this name, and it is where the description above came from. A page that mentions it carries the name somewhere in its text and may say nothing about it at all. Every page carrying it.

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 CLI flag does. All CLI flags.