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/skillnerds/xskill/xskill-helpernpx 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.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 | $0.00114 | $0.03066 |
| Opus 5 | $0.00057 | $0.01533 |
| Sonnet 5 | $0.00023 | $0.00613 |
| Haiku 4.5 | $0.00011 | $0.00307 |
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 4d 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 — 266 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) quietly collects your agent trajectories and syncs them to a team server. 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) — survives restarts |
~/.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.
Interactive xskill init then asks whether to join a team server. Enter,
skip, or an empty address/token all leave the machine usable locally. Do
not treat a skipped connect as failure. If they want to connect later, or
run a standalone team server:
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.
- 4d ago First seen · 266 lines · 114 tokens per session scan A 3265a579a7bf
xskill-helper is a skill published in the GitHub repository SkillNerds/xskill (122 stars, last pushed 3d ago), licensed MIT. It adds 114 tokens to every session and 3,066 once invoked, about $0.0006 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.
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