CLAUDE_CODE_INCREMENTAL_REQUEST_BODY

Updated October 31, 2026 by Alex Sorokoletov

CLAUDE_CODE_INCREMENTAL_REQUEST_BODY is a Claude Code environment variable: Enables sending the request body incrementally for first-party requests; defaults to 0 (off), a non-zero value turns it on when the server flag agrees, and 2 selects the block-based mode. Added in v2.1.311 and still present in v2.1.315. 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_INCREMENTAL_REQUEST_BODY=<value>
claude

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

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

Related variables

• CLAUDE_CODE_EXTRA_BODY: Additional JSON merged into API request bodies.
• 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.
• CLAUDE_AFK_COUNTDOWN_MS: Milliseconds before the away-from-keyboard timeout at which the warning countdown begins; defaults to 20000 and is capped at the timeout length.

Frequently asked questions

All variables, searchable: Claude Code environment variables.