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/understudy-ai/understudy/xurlnpx skills add understudy-ai/understudy --skill xurlgit clone --depth 1 https://github.com/understudy-ai/understudyWhat 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 | $0.00057 | $0.03548 |
| Opus 5 | $0.00028 | $0.01774 |
| Sonnet 5 | $0.00011 | $0.00710 |
| Haiku 4.5 | $0.00006 | $0.00355 |
Grade C, and why
xurl scanned grade C with 2 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.
Downloads and executes remote codehighSupply chain
curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.
curl -fsSL https://raw.githubusercontent.com/xdevplatform/xurl/main/install.sh | bash Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
`xurl` is a CLI tool for the X API. It supports both **shortcut commands** (human/agent‑friendly one‑liners) and **raw curl‑style** access to any v2 endpoint. All commands return JSON to stdout. This is a copy
91% identical to xurl — 84 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 462 lines — stays where its author put it; the contents beside it link to each section on GitHub.
xurl — Agent Skill Reference
xurl is a CLI tool for the X API. It supports both shortcut commands (human/agent‑friendly one‑liners) and raw curl‑style access to any v2 endpoint. All commands return JSON to stdout.
Installation
Homebrew (macOS)
brew install --cask xdevplatform/tap/xurl
npm
npm install -g @xdevplatform/xurl
Shell script
curl -fsSL https://raw.githubusercontent.com/xdevplatform/xurl/main/install.sh | bash
Installs to ~/.local/bin. If it's not in your PATH, the script will tell you what to add.
Go
go install github.com/xdevplatform/xurl@latest
Prerequisites
This skill requires the xurl CLI utility: https://github.com/xdevplatform/xurl.
Before using any command you must be authenticated. Run xurl auth status to check.
Secret Safety (Mandatory)
- Never read, print, parse, summarize, upload, or send
~/.xurl(or copies of it) to the LLM context. - Never ask the user to paste credentials/tokens into chat.
- The user must fill
~/.xurlwith required secrets manually on their own machine. - Do not recommend or execute auth commands with inline secrets in agent/LLM sessions.
- Warn that using CLI secret options in agent sessions can leak credentials (prompt/context, logs, shell history).
- Never use
--verbose/-vin agent/LLM sessions; it can expose sensitive headers/tokens in output. - Sensitive flags that must never be used in agent commands:
--bearer-token,--consumer-key,--consumer-secret,--access-token,--token-secret,--client-id,--client-secret. - To verify whether at least one app with credentials is already registered, run:
xurl auth status.
Register an app (recommended)
App credential registration must be done manually by the user outside the agent/LLM session. After credentials are registered, authenticate with:
xurl auth oauth2
For multiple pre-configured apps, switch between them:
xurl auth default prod-app # set default app
xurl auth default prod-app alice # set default app + user
xurl --app dev-app /2/users/me # one-off override
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 · 462 lines · 57 tokens per session scan C e5ad8b03445b
xurl is a skill published in the GitHub repository understudy-ai/understudy (456 stars, last pushed 2mo ago), licensed MIT. It adds 57 tokens to every session and 3,548 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it C with 2 findings (downloads and executes remote code, makes network calls). It is 91% identical to xurl, differing in 84 lines, and is treated as a copy.
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