CLAUDE_CODE_PROGRAM_USE_CASE_STAMPED

Updated November 3, 2026 by Alex Sorokoletov

CLAUDE_CODE_PROGRAM_USE_CASE_STAMPED is a Claude Code environment variable: Selects the program use case stamping mode: the value 'follow' enables follow mode, and any other non-empty value marks the session as stamped, changing how the use case profile is resolved. Added in v2.1.318 and still present in v2.1.318. It is not in the official reference.

How to set it

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

export CLAUDE_CODE_PROGRAM_USE_CASE_STAMPED=<value>
claude

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

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

Related variables

• CLAUDE_CODE_PROGRAM_USE_CASE_ID: Sets the program use case id attached to requests; it must be 1 to 128 characters of letters, digits, underscore or hyphen, and is ignored if it fails that check or the feature is off.
• CLAUDE_CODE_USE_CCR_V2: Use Claude Code Router v2 for cowork sessions.
• CLAUDE_CODE_USE_GATEWAY: Routes traffic through an Anthropic-operated gateway (with loopback and log-level tuning).
• USE_BUILTIN_RIPGREP: Force use of built-in ripgrep.
• CLAUDE_CODE_USE_NATIVE_FILE_SEARCH
• ANTHROPIC_BETAS: Comma-separated beta feature headers.
• ANTHROPIC_CUSTOM_HEADERS: Custom HTTP headers (newline-separated Key: Value).
• ANTHROPIC_FEDERATION_RULE_ID

Frequently asked questions

All variables, searchable: Claude Code environment variables.