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 SkillNerds/xskill --skill xskill-helpergit clone --depth 1 https://github.com/SkillNerds/xskillWrote 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/skillnerds/xskill/xskill-helper)<a href="https://agentmods.dev/skills/skillnerds/xskill/xskill-helper"><img src="https://agentmods.dev/badge/skills/skillnerds/xskill/xskill-helper/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/skillnerds/xskill/xskill-helper"><img src="https://agentmods.dev/badge/skills/skillnerds/xskill/xskill-helper.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 3 findings, up to high
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 →
- high Prompt Injection · line 264 This pattern attempts to override system instructions or ignore safety constraints. Without LLM analysis, manual review is recommended.Fix: Remove or rewrite any text that instructs the agent to ignore prompts, override safety rules, or trust unverified content. Ensure skill content cannot be injected to alter agent behavior.
- medium Rogue Agent · line 5 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.
- medium Rogue Agent · line 79 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 | $0.00114 | $0.03483 |
| Opus 5.5 | $0.00046 | $0.01393 |
| Sonnet 5.5 | $0.00023 | $0.00697 |
| Haiku 4.5 | $0.00011 | $0.00348 |
Grade A, and why
xskill-helper 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 — 298 lines — stays where its author put it; the contents beside it link to each section on GitHub.
xskill-helper
xskill is a thin client + background daemon that (1) mounts your team's shared Skills into every AI-agent tool you use (Claude Code, Codex, OpenCode, Cursor, Trae, DeepSeek Harness) and (2) collects your agent trajectories and syncs them to a team server; you choose which projects are uploaded (see "Controlling which trajectories are uploaded"). You join a server once, then it keeps skills in sync and auto-updates itself.
xskill init can install this guide into chosen harnesses on this machine.
xskill connect also installs it after a team join. Invoke it as
/xskill-helper from Claude Code, Codex, Cursor, and the other supported
tools.
All state lives under ~/.xskill/:
| File | What |
|---|---|
~/.xskill/local_init.json |
local harness scan marker (no team server required) |
~/.xskill/team_client.json |
connection identity (server_url, client_id, join_token, server privacy mode) — survives restarts |
~/.xskill/privacy.json |
local upload rules: mode + per-project allow/deny — never sent to the server |
~/.xskill/connect_daemon.json |
current background daemon (pid / host task) — used by status/stop |
~/.xskill/logs/xskill.*.log |
split logs (one file per component) |
~/.xskill/skill/ |
the local skill repo everything is mounted from |
Getting started
After pip install xskill, local trajectory search does not need a team
server. The first xskill traj search checks for a connection. If there is
no xskill connect and this machine has not been initialized, it scans
detected harnesses, converts their sessions into ~/.xskill/*_sessions,
and builds the local index. After that, xskill traj search and
xskill traj read work on this computer.
For a guided setup that lists harnesses, turns on trajectory processing, and asks which agents should get this guide:
xskill init
xskill init -y is the non-interactive form: scan every detected harness
and install /xskill-helper into all of them. --no-skill skips the
guide. --skills-only only installs the guide. --force rescans even if
the local index already exists.
What ships with it
2 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.
- 1mo ago Changed · +32 lines 653ac078c33f
- 1mo ago First seen · 266 lines · 114 tokens per session scan A 3265a579a7bf
xskill-helper is a skill published in the GitHub repository SkillNerds/xskill (128 stars, last pushed 1mo ago), licensed MIT. It adds 114 tokens to every session and 3,483 once invoked, about $0.0005 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 2026-08-30.
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Use when a CLI task needs an interactive terminal or control of a tmux session.
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Add Resend (email) channel integration via Chat SDK.