Ca Metrics Agent Skill

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.

960 tokens

context cost

the whole folder, loaded on every use

files

instructions only

copies elsewhere

how many repositories repackaged it

138

stars on the repo

on the repository, not the skill itself

Install

one command, takes just this skill from the repository

npx skills add https://github.com/arbiterForge/codeArbiter --skill ca-metrics

The instruction itself

4 sections, as written by the author

$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.

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How to use it

Copy the folder

Take arbiterforge/ca-metrics from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.