CLAUDE_CODE_ATTRIBUTION_ANNOUNCEMENT

Updated October 23, 2026 by Alex Sorokoletov

CLAUDE_CODE_ATTRIBUTION_ANNOUNCEMENT is a Claude Code environment variable. Removed in v2.1.310, so current releases ignore it. It is not in the official reference.

Status	Removed in v2.1.310
Added	Added between v2.1.266 and v2.1.269
Category	Other
Official docs	Not listed

How to set it

For one session, export it in the shell that starts Claude Code:

export CLAUDE_CODE_ATTRIBUTION_ANNOUNCEMENT=<value>
claude

To apply it to every session, add it to the env object of a settings file:

// ~/.claude/settings.json
{
  "env": {
    "CLAUDE_CODE_ATTRIBUTION_ANNOUNCEMENT": "<value>"
  }
}

Related variables

CLAUDE_CODE_ATTRIBUTION_HEADER: API billing header in system prompt.
CLAUDE_CODE_ATTRIBUTION_PROJECT
ANTHROPIC_BETAS: Comma-separated beta feature headers.
ANTHROPIC_CUSTOM_HEADERS: Custom HTTP headers (newline-separated Key: Value).
ANTHROPIC_FEDERATION_RULE_ID
ANTHROPIC_ORGANIZATION_ID
ANTHROPIC_WORKSPACE_ID
BETA_TRACING_ENDPOINT: Custom endpoint for beta tracing.

Frequently asked questions

Which Claude Code version has CLAUDE_CODE_ATTRIBUTION_ANNOUNCEMENT?

Removed in v2.1.310, so current releases ignore it.

How do I set CLAUDE_CODE_ATTRIBUTION_ANNOUNCEMENT?

Export it before starting Claude Code (export CLAUDE_CODE_ATTRIBUTION_ANNOUNCEMENT=value), or add it to the "env" object in ~/.claude/settings.json to apply it to every session.

All variables, searchable: Claude Code environment variables.