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/agent-sh/agnix/invalid-agentnpx skills add agent-sh/agnix --skill invalid-agentgit clone --depth 1 https://github.com/agent-sh/agnixWrote 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/agent-sh/agnix/invalid-agent)<a href="https://agentmods.dev/skills/agent-sh/agnix/invalid-agent"><img src="https://agentmods.dev/badge/skills/agent-sh/agnix/invalid-agent.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 | $0.00011 | $0.00079 |
| Opus 5 | $0.00005 | $0.00039 |
| Sonnet 5 | $0.00002 | $0.00016 |
| Haiku 4.5 | $0.00001 | $0.00008 |
Grade A, and why
invalid-agent-skill 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.
What it actually says
This skill has an invalid agent type. Agent must be a built-in (Explore, Plan, general-purpose) or a custom kebab-case name. Invalid_Agent is rejected because underscores are not allowed; use hyphens for kebab-case format.
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 · 11 lines · 11 tokens per session scan A 5140d280b6be
invalid-agent-skill is a skill published in the GitHub repository agent-sh/agnix (400 stars, last pushed 4d ago), licensed Apache-2.0. It adds 11 tokens to every session and 79 once invoked, about $0.0001 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.
Other skills, from other repositories
new-skill
Scaffold a new custom SKILL.md file interactively. Use when asked to create a new skill or slash command.
gh-issue
Create, view, list, or comment on GitHub issues. Use when asked to file, open, or manage GitHub issues.
gh-pr
Create, review, or manage GitHub pull requests. Use when asked to open, check, or merge a PR.
run-tests
Run the project test suite and surface failures. Use when asked to run tests or check test status.
branch
Create or switch to a feature branch, typically tied to a GitHub issue. Use when asked to create a branch or start work on an issue.
changelog
Generate a changelog or release notes from recent git history. Use when asked to write a changelog, summarize recent commits, or produce release notes.