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 plurigrid/asi --skill xenodium-elispgit clone --depth 1 https://github.com/plurigrid/asiWrote 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/plurigrid/asi/xenodium-elisp)<a href="https://agentmods.dev/skills/plurigrid/asi/xenodium-elisp"><img src="https://agentmods.dev/badge/skills/plurigrid/asi/xenodium-elisp/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/plurigrid/asi/xenodium-elisp"><img src="https://agentmods.dev/badge/skills/plurigrid/asi/xenodium-elisp.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Rogue Agent · line 153 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
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 | $0.00036 | $0.01912 |
| Opus 5.5 | $0.00014 | $0.00765 |
| Sonnet 5.5 | $0.00007 | $0.00382 |
| Haiku 4.5 | $0.00004 | $0.00191 |
Grade A, and why
xenodium-elisp 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 1mo 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.
How it starts
The opening of the file, as written. The whole thing — 221 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Xenodium Elisp Skill
"The best UI is no UI. The second best UI is Emacs."
Package Overview
| Package | Stars | Description |
|---|---|---|
| chatgpt-shell | 1180⭐ | Multi-LLM Emacs shell (ChatGPT, Claude, DeepSeek, Gemini, Ollama) |
| agent-shell | 415⭐ | Native Emacs buffer for LLM agents via ACP |
| dwim-shell-command | 293⭐ | Save and apply shell commands with ease |
| acp.el | 109⭐ | Agent Client Protocol implementation |
| ob-swiftui | 87⭐ | SwiftUI in Org Babel blocks |
| sqlite-mode-extras | 58⭐ | Enhanced sqlite-mode |
chatgpt-shell: Multi-LLM Interface
(use-package chatgpt-shell
:custom
(chatgpt-shell-model-version "gpt-4o")
(chatgpt-shell-anthropic-key (getenv "ANTHROPIC_API_KEY"))
(chatgpt-shell-openai-key (getenv "OPENAI_API_KEY"))
:config
;; Switch between models
(setq chatgpt-shell-model-versions
'("gpt-4o" "gpt-4-turbo" "claude-3-5-sonnet" "gemini-pro")))
;; Key bindings
(global-set-key (kbd "C-c g") 'chatgpt-shell)
(global-set-key (kbd "C-c G") 'chatgpt-shell-send-region)
Shell Commands
| Command | Description |
|---|---|
chatgpt-shell |
Open interactive shell |
chatgpt-shell-send-region |
Send selected region |
chatgpt-shell-describe-code |
Explain code at point |
chatgpt-shell-refactor-code |
Refactor with AI |
chatgpt-shell-generate-unit-test |
Generate tests |
agent-shell: ACP-Powered Agents
Agent Client Protocol enables structured agent workflows:
(use-package agent-shell
:after acp
:config
(setq agent-shell-default-agent "coding-assistant"))
;; Define custom agent
(acp-define-agent "music-topos-agent"
:system-prompt "You are a categorical music theory assistant..."
:tools '((:name "generate-color"
:description "Generate deterministic color from seed"
:parameters ((:name "seed" :type "integer")
(:name "index" :type "integer")))))
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.
- 1mo ago First seen · 221 lines · 36 tokens per session scan A 8332c42990e9
xenodium-elisp is a skill published in the GitHub repository plurigrid/asi (70 stars, last pushed 3mo ago), licensed MIT. It adds 36 tokens to every session and 1,912 once invoked, about $0.0001 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 2026-09-03.
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