CLAUDE_CODE_PERFETTO_WRITE_INTERVAL_S

Updated October 14, 2026 by Alex Sorokoletov

CLAUDE_CODE_PERFETTO_WRITE_INTERVAL_S is a Claude Code environment variable. Added between v2.1.143 and v2.1.212 and still present in v2.1.295. It is not in the official reference.

Status	Present in v2.1.295
Added	Added between v2.1.143 and v2.1.212
Category	Telemetry
Official docs	Not listed

How to set it

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

export CLAUDE_CODE_PERFETTO_WRITE_INTERVAL_S=<value>
claude

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

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

Related variables

CLAUDE_CODE_DATADOG_FLUSH_INTERVAL_MS: Datadog metrics flush interval (ms).
CLAUDE_CODE_PERFETTO_TRACE: Enable Perfetto trace output to file path (server-gated).
CLAUDE_CODE_DD_ERROR_TRACKING_FLUSH_INTERVAL_MS
CLAUDE_CODE_BYOC_ENABLE_DATADOG: Opt-in Datadog telemetry for BYOC (Bring Your Own Cloud) Bedrock/Vertex deployments.
CLAUDE_CODE_DISABLE_FEEDBACK_SURVEY: Survey prompts.
CLAUDE_CODE_ENABLE_FEEDBACK_SURVEY_FOR_OTEL: Re-enables the session quality survey for enterprise deployments with OTEL enabled.
CLAUDE_CODE_ENABLE_TELEMETRY: Enable telemetry collection.
CLAUDE_CODE_ENHANCED_TELEMETRY_BETA: Enable enhanced telemetry (beta).

Frequently asked questions

Which Claude Code version has CLAUDE_CODE_PERFETTO_WRITE_INTERVAL_S?

Added between v2.1.143 and v2.1.212 and still present in v2.1.295.

How do I set CLAUDE_CODE_PERFETTO_WRITE_INTERVAL_S?

Export it before starting Claude Code (export CLAUDE_CODE_PERFETTO_WRITE_INTERVAL_S=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.