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 noahlz/claude-plugins --skill view-cost-metricsgit clone --depth 1 https://github.com/noahlz/claude-pluginsWrote 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/noahlz/claude-plugins/view-cost-metrics)<a href="https://agentmods.dev/skills/noahlz/claude-plugins/view-cost-metrics"><img src="https://agentmods.dev/badge/skills/noahlz/claude-plugins/view-cost-metrics/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/noahlz/claude-plugins/view-cost-metrics"><img src="https://agentmods.dev/badge/skills/noahlz/claude-plugins/view-cost-metrics.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 | $0.00034 | $0.00921 |
| Opus 5 | $0.00017 | $0.00461 |
| Sonnet 5 | $0.00007 | $0.00184 |
| Haiku 4.5 | $0.00003 | $0.00092 |
Grade B, and why
view-cost-metrics scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Reads agent configuration directoriesmediumAgent snooping
.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.
**SKILL_CONFIG**: !`node "${CLAUDE_SKILL_DIR}/../../lib/check-skill-config.js" "./.claude/settings.plugins.view-cost-metrics.json"` How it starts
The opening of the file, as written. The whole thing — 120 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Use this skill to display current session cost metrics without creating a commit.
MANDATORY only activate this skill when the user invokes it directly (/view-cost-metrics) OR asks about current session costs.
Follow the workflow steps EXACTLY.
Skill Workflow Checklist
- [ ] 0. Prerequisites
- [ ] 1. Resolve SessionID
- [ ] 2. Fetch cost data
- [ ] 3. Display costs
Skill Context
SKILL_BASE_DIR: ${CLAUDE_SKILL_DIR}
⛔ VERSION CHECK: If SKILL_BASE_DIR above shows literal ${CLAUDE_SKILL_DIR} instead of a real path, halt: "This skill requires Claude Code 2.1.69 or higher."
Node.js Check: !node "${CLAUDE_SKILL_DIR}/../../lib/check-node-version.js"
⛔ HALT if Node.js Check shows ERROR.
Dependencies: !node "${CLAUDE_SKILL_DIR}/../../lib/check-dependencies.js" "${CLAUDE_SKILL_DIR}/../.."
Workflow Rules & Guardrails
MANDATORY: FOLLOW THESE RULES FOR THE ENTIRE WORKFLOW.
A. Narration Control
⚠️ SILENCE PROTOCOL Only narrate steps with a STEP_DESCRIPTION field. Execute all other steps and tool calls silently - no explanatory text.
B. JSON Response Protocol
All script outputs return JSON. Extract fields and store in variables.
Skill Workflow Instructions
0. Prerequisites
SKILL_NAME: view-cost-metrics
MODE: Determine from $ARGUMENTS: if it contains "cumulative" or "cum" → cumulative; otherwise → incremental (default, also matches "incremental" or "inc")
SKILL_CONFIG: !node "${CLAUDE_SKILL_DIR}/../../lib/check-skill-config.js" "./.claude/settings.plugins.view-cost-metrics.json"
Configuration Routing:
- If
SKILL_CONFIG=✓ Configuration found→ Proceed to Step 1a (Load Configuration) - If
SKILL_CONFIG=NOT_CONFIGURED→ Skip Step 1a, proceed to Step 1b (Create Configuration)
1. Resolve SessionID
1a. Load existing configuration
→ Configuration exists. Proceed to Step 2.
→ (The script reads the config file directly via --config flag.)
What ships with it
3 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.
- 10d ago First seen · 120 lines · 34 tokens per session scan B 14524802821e
view-cost-metrics is a skill published in the GitHub repository noahlz/claude-plugins (5 stars, last pushed 8d ago), licensed MIT. It adds 34 tokens to every session and 921 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it B with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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