ca-metrics

Productivity

Read-only 3-metric governance glance — override rate, small-lane rate, sprint low-confidence ratio — each with a trend arrow vs. the prior 20-commit window.

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Source SKILL.md: https://github.com/arbiterForge/codeArbiter/blob/HEAD/plugins/ca-codex/skills/ca-metrics/SKILL.md

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$ca-metrics — governance trend glance

A bare-numbers summary of the three governance-health metrics that _metricslib.py tracks across commit windows. Each metric shows its value for the current 20-commit window and a direction arrow (↑/↓/→) relative to the immediately preceding window.

This is NOT a second $ca-audit packet. It prints numbers and arrows only — no verbatim override lines, no commit list, no file write. Use it to spot a trend at a glance; reach for $ca-audit when you need the full evidentiary packet.

Flow

Invoke the helper. Call the thin entry hook metrics.py, which wraps compute from _metricslib.py, via a Windows-safe python3 … || python … fallback. Pass <project-root> as --root. If --window N was supplied, pass it through as --window N; otherwise omit it (the helper applies the default of 20).
```
python3 "${CLAUDE_PLUGIN_ROOT}/hooks/metrics.py" --root "<project-root>" || python "${CLAUDE_PLUGIN_ROOT}/hooks/metrics.py" --root "<project-root>"
```
ensure_ascii note — do not remove this. metrics.py calls json.dumps with its default ensure_ascii=True. This ASCII-escapes the arrow glyphs (↑↓→) in the subprocess stdout, which avoids a UnicodeEncodeError on Windows cp1252 consoles that cannot encode those code-points raw. The rendered output you present to the user (step 2 below) uses the real glyphs — they are written by the assistant, not piped through the subprocess stdout. Do NOT add ensure_ascii=False here.

With a custom window size:
```
python3 "${CLAUDE_PLUGIN_ROOT}/hooks/metrics.py" --root "<project-root>" --window N || python "${CLAUDE_PLUGIN_ROOT}/hooks/metrics.py" --root "<project-root>" --window N
```
Replace N with the integer the user supplied.
Render the glance. Parse the returned JSON dict. Present exactly three lines, one per metric, in this order:
```
override rate:          <current>  <arrow>  (prior: <prior>)
small-lane rate:        <current>  <arrow>  (prior: <prior>)
sprint low-conf ratio:  <current>  <arrow>  (prior: <prior>)
```
- Use the real glyphs ↑, ↓, → in your message (not the JSON-escaped forms).
- For sprint_low_conf_ratio, the current or prior value may be the string "n/a" — render it literally (e.g. n/a ↑).
- ↑ on override_rate and sprint_low_conf_ratio is a worsening signal; state this briefly below the table so the reader does not have to guess.
State the window. Append one line naming the window size used, e.g. Window: 20 commits (default) or Window: N commits (--window N).

Hard gate

Read-only. MUST NOT write, create, or modify any file. MUST NOT stage or commit. git status MUST be unchanged after a run.
Emits ONLY the fixed 3-metric glance: override_rate, small_lane_rate, sprint_low_conf_ratio. MUST NOT emit verbatim override log lines, verbatim triage entries, commit lists, or any other content from the governance logs.
MUST NOT require $ca-init to have been run. The helper degrades gracefully on absent logs (counts return 0 / ratio returns "n/a"); surface the degraded values as-is rather than blocking.
If the helper subprocess fails entirely (import error, Python not found), report the error and stop — do not fabricate metric values.

When NOT to use

Full governance packet with verbatim overrides and audit trail → $ca-audit.
Live project state (active sprint, open confirms, hook health) → $ca-status.