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 Agent-One-Lab/AgentFly --skill add-numbersgit clone --depth 1 https://github.com/Agent-One-Lab/AgentFlyWrote 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/agent-one-lab/agentfly/add-numbers)<a href="https://agentmods.dev/skills/agent-one-lab/agentfly/add-numbers"><img src="https://agentmods.dev/badge/skills/agent-one-lab/agentfly/add-numbers/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/agent-one-lab/agentfly/add-numbers"><img src="https://agentmods.dev/badge/skills/agent-one-lab/agentfly/add-numbers.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 | $0.00046 | $0.00198 |
| Opus 5.5 | $0.00018 | $0.00079 |
| Sonnet 5.5 | $0.00009 | $0.00040 |
| Haiku 4.5 | $0.00005 | $0.00020 |
Grade A, and why
add-numbers 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 2d 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
Add Numbers
To add two numbers a and b:
-
Call
run_skill_scriptwith:skill: "add-numbers"path: "scripts/add.py"stdin: " " (the two numbers separated by a space)
-
The script will print the sum on stdout. Report that sum to the user.
Example: if the user asks "what is 3 plus 5", send stdin "3 5". The script will print 8. Reply: 3 + 5 = 8.
Do not add the numbers yourself. Always use the script.
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.
- 2d ago First seen · 21 lines · 46 tokens per session scan A 63080a600acc
add-numbers is a skill published in the GitHub repository Agent-One-Lab/AgentFly (122 stars, last pushed 2d ago), licensed Apache-2.0. It adds 46 tokens to every session and 198 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-10-28.
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