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 agentmods add skills/keyargo/custodian-kernel/s3-listnpx skills add KeyArgo/custodian-kernel --skill s3-listgit clone --depth 1 https://github.com/KeyArgo/custodian-kernelWrote 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/keyargo/custodian-kernel/s3-list)<a href="https://agentmods.dev/skills/keyargo/custodian-kernel/s3-list"><img src="https://agentmods.dev/badge/skills/keyargo/custodian-kernel/s3-list.svg" alt="Measured on agentmods" 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 | $0.00024 | $0.00124 |
| Opus 5 | $0.00012 | $0.00062 |
| Sonnet 5 | $0.00005 | $0.00025 |
| Haiku 4.5 | $0.00002 | $0.00012 |
Grade A, and why
s3-list 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 5d 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.
What it actually says
S3 List
List objects in an S3 bucket (or GCS/R2 with S3-compat API)
What ships with it
1 file 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.
- 5d ago First seen · 20 lines · 24 tokens per session scan A c53cb455a8e0
s3-list is a skill published in the GitHub repository KeyArgo/custodian-kernel (118 stars, last pushed 13d ago), licensed MIT. It adds 24 tokens to every session and 124 once invoked, about $0.0001 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.
Other skills, from other repositories
gnt-check-action
Check a side-effectful action against this organization's approved gnt rules before taking it, and stop on a blocked or needshuman verdict.
dev-standards
Enforces development workflows, quality gates, coding standards, and release processes for the deterministic-agent-control-protocol project. Use when implementing features, fixing bugs, refactoring architecture, adding integrations, updating policies, writing tests, updating documentation, or preparing releases.
openbot-data-access
Governs how the OpenBot browser app reads and writes server data — every request goes through client in app/src/lib/client.ts, every read is a queryOptions factory in app/src/lib/ /queries.ts, every write is a mutationOptions factory in app/src/lib/ /mutations.ts, and components consume them through…
dep-updates
Plan and apply Go dependency updates, including advisory-driven bumps, Trivy/govulncheck validation, and supply-chain review. Use when the user asks to update dependencies, refresh modules for security alerts, or run dependency vulnerability scans.
repro
Turn a bug symptom into a structured, reproducible bug report — summary, environment, exact repro steps, actual vs expected, and evidence (logs, error text, failing route/test) — and then optionally scaffold a failing regression test that pins it. Use this the moment a bug, defect, crash, 500, wrong count, broken…
agt-policy-authoring
Create and validate a minimal AGT Copilot CLI policy tailored to the repository being inspected.