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 VictoriaMetrics/skills --skill victoriametrics-cardinality-analysisgit clone --depth 1 https://github.com/VictoriaMetrics/skillsWrote 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/victoriametrics/skills/victoriametrics-cardinality-analysis)<a href="https://agentmods.dev/skills/victoriametrics/skills/victoriametrics-cardinality-analysis"><img src="https://agentmods.dev/badge/skills/victoriametrics/skills/victoriametrics-cardinality-analysis/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/victoriametrics/skills/victoriametrics-cardinality-analysis"><img src="https://agentmods.dev/badge/skills/victoriametrics/skills/victoriametrics-cardinality-analysis.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00113 | $0.04320 |
| Opus 5 | $0.00056 | $0.02160 |
| Sonnet 5 | $0.00023 | $0.00864 |
| Haiku 4.5 | $0.00011 | $0.00432 |
Grade C, and why
victoriametrics-cardinality-analysis scanned grade C with 2 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 12d 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.
Hidden instructionshighPrompt injection
Directives inside HTML comments, invisible characters or bidirectional overrides are read by the model and not by the person reviewing the file.
```yaml metric_relabel_configs: - regex: "user_id|request_id|session_id|trace_id|error_message|sql_query" action: labeldrop ``` </details> <details> <summary>Stream aggregation for high-cardinality HTTP labels</summary Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
allowed-tools: Bash(curl:*), Bash(jq:*), Bash(date:*) How it starts
The opening of the file, as written. The whole thing — 466 lines — stays where its author put it; the contents beside it link to each section on GitHub.
VictoriaMetrics Cardinality Analysis
Systematic cardinality analysis for VictoriaMetrics. Collects TSDB status, metric usage stats, and label value patterns, then produces a structured report with specific relabeling and stream aggregation configs the user can apply directly.
The goal is to find the highest-impact optimization opportunities — metrics nobody queries, labels that explode cardinality for no monitoring value, and patterns that indicate data hygiene problems (error messages as labels, SQL text as labels, UUIDs as labels).
Environment
Uses the same env vars as the victoriametrics-query skill:
# $VM_METRICS_URL - base URL
# cluster: export VM_METRICS_URL="https://vmselect.example.com/select/0/prometheus"
# single: export VM_METRICS_URL="http://localhost:8428"
# $VM_CURL_CONFIG - curl config file with auth header (unset if no auth is required)
# Remote: export VM_CURL_CONFIG="$HOME/.config/victoriametrics/curl.conf"
# Local: leave unset (defaults to /dev/null - no auth)
Workflow
Phase 1: Data Collection
Spawn 3 subagents in a single response to collect data in parallel. Each subagent prompt must include the curl auth pattern and environment variable references above.
If the user specified a scope (job, namespace, metric prefix), pass it as match[] parameter to
TSDB status queries and as series selectors to label queries.
Subagent 1: TSDB Overview
Agent name: cardinality-tsdb | Description: "Collect TSDB cardinality stats"
Query 1 — Yesterday's series (captures recently churned series):
curl -q --config "${VM_CURL_CONFIG:-/dev/null}" -s \
"$VM_METRICS_URL/api/v1/status/tsdb?topN=50&date=$(date -d 'yesterday' +%Y-%m-%d)" | jq '.data'
Queries yesterday's stats — broader than today (includes series that may have already churned) without scanning the entire TSDB.
Query 2 — Today's active series:
curl -q --config "${VM_CURL_CONFIG:-/dev/null}" -s \
"$VM_METRICS_URL/api/v1/status/tsdb?topN=50" | jq '.data'
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.
- 12d ago First seen · 466 lines · 113 tokens per session scan C 5ab699a4bf2c
victoriametrics-cardinality-analysis is a skill published in the GitHub repository VictoriaMetrics/skills (54 stars, last pushed 2d ago), licensed Apache-2.0. It adds 113 tokens to every session and 4,320 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it C with 2 findings (hidden instructions, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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