Harness telemetry

How to get per-call usage out of each coding agent (harness) into the collector. Nothing else about the harness changes.

Coverage (tentative priority, not measured market share)

Harness	Path	Status
Claude Code	native OTel: `CLAUDE_CODE_ENABLE_TELEMETRY=1`, `OTEL_*`; see `claude-code-with-telemetry`	working
Codex CLI	native OTel: `[otel]` in `~/.codex/config.toml`	to verify
Gemini CLI	native OTel: `telemetry` block in `settings.json`	to verify
GitHub Copilot	no per-call export known; org usage from GitHub Copilot metrics API	to verify
Cursor	no per-call export known; team usage and spend from Cursor admin API	to verify
Long tail: Windsurf, Cline/Roo, Aider, OpenCode, Amp, Kiro, Antigravity, Pi	local session logs (`transcripts.md`) or an LLM gateway	to research

Three paths, in order of preference:

Native OTel from the harness: per call, most detail.
LLM gateway (LiteLLM or a cloud AI gateway) between harness and model API: per call, works for any harness that uses an API key; blind to subscription plans.
Vendor admin APIs or local session logs: per user and day, or per session after the fact.

Detect installed harnesses on the workstation.
Pick the path per harness from the table.
Write settings to per-user config files, not shell env; corporate rollouts ship them through the harness's managed/enterprise settings.
Verify with one short prompt per harness.

Cost in telemetry is a list-price estimate. On flat subscriptions (Max, Team, seats) real spend comes from billing (../04-auto-analysis/billing.md).
Harnesses drop telemetry silently when the endpoint is down.
Attribute names change between harness versions; record the harness version with every record.
Users can unset env vars; only managed settings make it stick.
The same person shows up with a different identity per harness (vendor account email, GitHub handle); mapping in ../06-optional/identity.md.
Headless runs (CI, scheduled agents) have no human user; tag them as such (../04-auto-analysis/deployments.md).