Inline per-trace metrics + Claude Code identity on traces

[collincunn]

Summary

• Hook now posts a set of deterministic, git-grounded feedback scores on every trace close (Stop / Compact / SessionEnd). No daemon, no queue, no LLM.
• Trace metadata + tags carry the Claude Code OAuth identity (user + org), so dashboards can distinguish users without inference.

What lands on each trace

Feedback scores (computed in the hook):

Name	Source
cc.repository	git remote get-url origin → host/org/repo
cc.branch	git branch --show-current
cc.head_sha_start / cc.head_sha_end	git rev-parse HEAD at trace start / end
cc.commits_in_trace	git log start..end --shortstat
cc.lines_committed	sum of +/- across those commits
cc.uncommitted_lines / cc.uncommitted_files	git diff HEAD --shortstat at trace close
cc.files_authored	distinct file paths in Edit/Write/MultiEdit transcript entries
cc.lines_authored / cc.lines_overwritten	line counts of new_string / old_string in those entries

Trace metadata (metadata.cc):

user_email, user_uuid, user_display_name, org_uuid, org_name

Read from ~/.claude.json oauthAccount. Email is also pushed onto trace.tags as user:<email> for filtering.

Why this shape

• All values are deterministic and locally derivable — no LLM, no settle/poll delay.
• Capturing HEAD SHA at trace start lets the close-time computation report a true commit window for the turn.
• Identity comes from Claude Code's OAuth account (not git config user.email), so it aligns with billing/auth and gives a stable org primitive for team-level views.
• Plain feedback scores + standard metadata keeps the surface compatible with existing Opik UI filtering, charts, and rollups.

What changed

• src/state.go — adds Cwd, HeadSHAStart so close-time ops can anchor against trace start
• src/api.go — adds Put; adds Metadata to Trace
• src/identity.go — ~/.claude.json reader + applyToTrace helper
• src/metrics.go — transcript walk for edit aggregates + git wrappers + feedback-score POST
• src/main.go — captures cwd/HEAD on UserPromptSubmit/PreCompact; applies identity to every created trace; calls postTraceMetrics on trace closure

Test plan

• Verified end-to-end against comet-all/claude-code project: 12 cc.* scores landing per trace, identity present in metadata.cc, user:<email> tag visible
• Verified edit aggregates match real edits (single-edit turn → files_authored=1, lines_authored=2, lines_overwritten=1)
• Compile check: make build succeeds on the four target platforms

🤖 Generated with Claude Code