Claude Code

Claude Code (Anthropic) has native OpenTelemetry. Metrics and events are emitted out of the box; the full trace tree (interaction → LLM request / tool → sub-agents) is currently behind a beta flag.

See Trace Coding Agents for the endpoints, API key, and what Everstack renders. Below is the Claude Code setup.

Environment variables

export CLAUDE_CODE_ENABLE_TELEMETRY=1
export CLAUDE_CODE_ENHANCED_TELEMETRY_BETA=1     # trace span tree (beta)
export OTEL_TRACES_EXPORTER=otlp
export OTEL_METRICS_EXPORTER=otlp
export OTEL_LOGS_EXPORTER=otlp
export OTEL_EXPORTER_OTLP_PROTOCOL=http/protobuf
export OTEL_EXPORTER_OTLP_ENDPOINT=https://<your-instance>
export OTEL_EXPORTER_OTLP_HEADERS="Authorization=Bearer <your-api-key>"
export OTEL_LOG_TOOL_DETAILS=1                    # include tool names/args
export OTEL_LOG_TOOL_CONTENT=1                    # include tool input/output

To apply this to every Claude Code session, set the same variables in the env block of ~/.claude/settings.json.

Keep the key out of config (recommended)

Rather than hard-coding the key in OTEL_EXPORTER_OTLP_HEADERS, use Claude Code's otelHeadersHelper so the token lives in a separate file. In ~/.claude/settings.json:

{
  "env": {
    "CLAUDE_CODE_ENABLE_TELEMETRY": "1",
    "CLAUDE_CODE_ENHANCED_TELEMETRY_BETA": "1",
    "OTEL_TRACES_EXPORTER": "otlp",
    "OTEL_METRICS_EXPORTER": "otlp",
    "OTEL_LOGS_EXPORTER": "otlp",
    "OTEL_EXPORTER_OTLP_PROTOCOL": "http/protobuf",
    "OTEL_EXPORTER_OTLP_ENDPOINT": "https://<your-instance>"
  },
  "otelHeadersHelper": "/home/you/.claude/otel-headers.sh"
}

The helper must print the header as JSON (not key=value):

#!/bin/bash
echo "{\"Authorization\": \"Bearer $(cat ~/.config/everstack/api-key)\"}"

Make it executable (chmod 700) and store the key in ~/.config/everstack/api-key (chmod 600). Do not also set OTEL_EXPORTER_OTLP_HEADERS — the two conflict.

Notes

• Claude Code is the only common coding agent that reports a dollar cost directly; it's used as-is and never recomputed.
• Pointing Claude Code at an Anthropic-compatible endpoint for a different model provider keeps this exact telemetry setup — see GLM and Kimi.