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 Starchild-ai-agent/official-skills --skill x-mcpgit clone --depth 1 https://github.com/Starchild-ai-agent/official-skillsWrote 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/starchild-ai-agent/official-skills/x-mcp)<a href="https://agentmods.dev/skills/starchild-ai-agent/official-skills/x-mcp"><img src="https://agentmods.dev/badge/skills/starchild-ai-agent/official-skills/x-mcp/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/starchild-ai-agent/official-skills/x-mcp"><img src="https://agentmods.dev/badge/skills/starchild-ai-agent/official-skills/x-mcp.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00162 | $0.06829 |
| Opus 5 | $0.00081 | $0.03415 |
| Sonnet 5 | $0.00032 | $0.01366 |
| Haiku 4.5 | $0.00016 | $0.00683 |
Grade D, and why
x-mcp scanned grade D with 3 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Harvests environment variableshighData exfiltration
Enumerating or grepping the environment for keys collects credentials unrelated to what the mod says it does.
## STEP 2 — Collect credentials securely Asks for rootmediumPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
mkdir -p "$(dirname "$XURL_STORE")"; chmod 700 "$(dirname "$XURL_STORE")" 2>/dev/null || true Runs shell commandslowCapability
Expected in a hook, worth knowing in a rule or an instructions file.
Run a single Python driver that holds xurl's stdin open via `subprocess.PIPE`, 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 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.
- 8d ago First seen · 484 lines · 162 tokens per session scan D af8626cf9dff
x-mcp is a skill published in the GitHub repository Starchild-ai-agent/official-skills (26 stars, last pushed yesterday), with no licence file. It adds 162 tokens to every session and 6,829 once invoked, about $0.0008 per session on Opus 5. A static security scan graded it D with 3 findings (harvests environment variables, asks for root, runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
Other skills, from other repositories
X
Operate on X/Twitter through the canonical Home23 X skill. Uses the logged-in bird browser session by default; official API access is explicit opt-in.
social-x-post-card
Realistic X post card with engagement metrics (likes, reposts, views), suited to video overlays or shareable image cards.
card-twitter
Twitter quote or data card designed to pair with a post.
x-research
Read X (Twitter) via xurl — search posts, fetch threads, read profiles, and read long-form articles.
social-x-post-card
A realistic X post card that displays a profile, handle, post text, optional quoted content or image area, and engagement figures such as likes, reposts, replies, and views. X is the social platform formerly known as Twitter.
card-twitter
A design template for making image cards that share a quote or data point on Twitter, now called X. It uses a large central statement, author details, a small category label, and a brand mark.