Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add oliver-kriska/claude-elixir-phoenix --skill skill-monitorgit clone --depth 1 https://github.com/oliver-kriska/claude-elixir-phoenixWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/oliver-kriska/claude-elixir-phoenix/skill-monitor)<a href="https://agentmods.dev/skills/oliver-kriska/claude-elixir-phoenix/skill-monitor"><img src="https://agentmods.dev/badge/skills/oliver-kriska/claude-elixir-phoenix/skill-monitor/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/oliver-kriska/claude-elixir-phoenix/skill-monitor"><img src="https://agentmods.dev/badge/skills/oliver-kriska/claude-elixir-phoenix/skill-monitor.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Anti-Refusal · line 199 Skill instructs the agent to omit warnings, disclaimers, or ethical commentary. Stripping safety caveats hides risk from the user and is a common jailbreak preamble.Fix: Remove instructions that suppress warnings, disclaimers, or ethical commentary. Let the agent surface safety-relevant caveats to the user.
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00041 | $0.02235 |
| Opus 5 | $0.00020 | $0.01118 |
| Sonnet 5 | $0.00008 | $0.00447 |
| Haiku 4.5 | $0.00004 | $0.00224 |
Grade A, and why
skill-monitor scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 13d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 223 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Monitor
Closed-loop skill effectiveness monitoring. Reads session metrics, computes per-skill signals, identifies what's working and what needs improvement.
Inspired by the deploy-monitor-evaluate-improve feedback loop: skills get better over time instead of staying static.
Requirements
Requires .claude/session-metrics/metrics.jsonl from /session-scan.
If no data: suggest running /session-scan first.
Usage
/skill-monitor # Dashboard: all skills
/skill-monitor --skill review # Deep-dive on one skill
/skill-monitor --improve # Generate improvement recommendations
/skill-monitor --window 30d # Change comparison window (default: 7d)
What Main Context Does
Step 1: Parse Arguments
Extract from $ARGUMENTS:
--skill NAME: Focus on one skill (e.g.,review,plan,investigate)--improve: Spawn analysis agent for improvement recommendations--window PERIOD: Comparison window (7d,30d,all; default:7d)
Step 2: Load Metrics
Read .claude/session-metrics/metrics.jsonl. For each entry, extract
the skill_effectiveness field (added by compute-metrics.py v2).
Filter by window period. Count sessions with and without skill usage.
If no skill_effectiveness data exists in metrics: "Metrics were
computed before skill tracking was added. Run /session-scan --rescan
to recompute."
OTel invocation_trigger (CC v2.1.126+): when compute-metrics.py
ingests claude_code.skill_activated events, each invocation carries
an invocation_trigger of "user-slash", "claude-proactive", or
"nested-skill". If absent (older sessions), default to
"unknown" — do NOT assume "user-slash".
Step 3: Compute Per-Skill Aggregates
For each skill found across all sessions, aggregate:
| Metric | Computation |
|-------------------------|------------------------------------------------|
| Total invocations | Sum of invocation_count across sessions |
| Sessions used in | Count of sessions containing this skill |
| Action rate | Weighted avg of per-session action_rate |
| Avg post-errors | Weighted avg of avg_post_errors |
| Avg post-corrections | Weighted avg of avg_post_corrections |
| Outcome distribution | Count of effective/friction/no_action/mixed |
| Effectiveness score | action_rate - (0.3 * avg_post_corrections) |
| Adjusted score | For analysis/check skills, use lower thresholds |
| Trigger distribution | Counts of user-slash / claude-proactive / nested-skill / unknown |
| Proactive trigger rate | claude-proactive / (user-slash + claude-proactive + nested-skill) |
| Auto-load gap | Skills with 0 claude-proactive invocations across window |
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 13d ago First seen · 223 lines · 41 tokens per session scan A 682711600d16
skill-monitor is a skill published in the GitHub repository oliver-kriska/claude-elixir-phoenix (544 stars, last pushed 2d ago), licensed MIT. It adds 41 tokens to every session and 2,235 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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