OTEL_LOG_TOOL_DETAILS

Updated October 13, 2026 by Alex Sorokoletov

OTEL_LOG_TOOL_DETAILS is a Claude Code environment variable: Include tool execution details. Its release history is not tracked here. It is listed in the official reference.

Status	Present in v2.1.294
Category	Telemetry
Official docs	Listed

How to set it

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

export OTEL_LOG_TOOL_DETAILS=<value>
claude

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

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

Related variables

OTEL_LOG_TOOL_CONTENT: Include tool input/output in telemetry.
OTEL_LOG_ASSISTANT_RESPONSES
OTEL_LOG_MANAGED_SETTINGS
OTEL_LOG_RAW_API_BODIES
OTEL_LOG_USER_PROMPTS: Include user prompts in telemetry.
CLAUDE_CODE_ENABLE_FEEDBACK_SURVEY_FOR_OTEL: Re-enables the session quality survey for enterprise deployments with OTEL enabled.
CLAUDE_CODE_OTEL_CONTENT_MAX_LENGTH: Caps the length of content attributes on OpenTelemetry spans and logs; the truncation function takes the minimum of this value (default 60 KB) and the standard OTEL attribute-length limits, appending a "[TRUNCATED — Content exceeds NKB limit]" marker.
CLAUDE_CODE_OTEL_DIAG_STDERR

Frequently asked questions

What does OTEL_LOG_TOOL_DETAILS do?

Include tool execution details

Which Claude Code version has OTEL_LOG_TOOL_DETAILS?

Its release history is not tracked here.

How do I set OTEL_LOG_TOOL_DETAILS?

Export it before starting Claude Code (export OTEL_LOG_TOOL_DETAILS=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.