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 agents/zebbern/termstack/ctf_binarygit clone --depth 1 https://github.com/zebbern/termstackWhat 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 | $0.00034 | $0.06329 |
| Opus 5 | $0.00017 | $0.03164 |
| Sonnet 5 | $0.00007 | $0.01266 |
| Haiku 4.5 | $0.00003 | $0.00633 |
Grade C, and why
ctf_binary scanned grade C with 3 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Asks for rootmediumPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
- **ASLR locally**: Disable for initial development (`echo 0 | sudo tee /proc/sys/kernel/randomize_va_space`), re-enable for final testing. Unrestricted tool accessmediumExcessive agency
A wildcard tool grant or "run any command" leaves no least-privilege boundary at all.
- **Modprobe path**: Overwrite `modprobe_path` to execute arbitrary scripts on unknown file format Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
| **GEF** | `bash -c "$(curl -fsSL https://gef.blah.cat/sh)"` | All-rounder, great heap commands | The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
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.
- yesterday First seen · 563 lines · 34 tokens per session scan C c34938b140a5
ctf_binary is an agent published in the GitHub repository zebbern/termstack (5 stars, last pushed 4mo ago), with no licence file. It adds 34 tokens to every session and 6,329 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it C with 3 findings (asks for root, unrestricted tool access, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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