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/agentic-insights/foundry/agentskills-ionpx skills add Agentic-Insights/foundry --skill agentskills-iogit clone --depth 1 https://github.com/Agentic-Insights/foundryWrote 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/agentic-insights/foundry/agentskills-io)<a href="https://agentmods.dev/skills/agentic-insights/foundry/agentskills-io"><img src="https://agentmods.dev/badge/skills/agentic-insights/foundry/agentskills-io.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 5.1 | $0.00086 | $0.01131 |
| Opus 5 | $0.00043 | $0.00566 |
| Sonnet 5 | $0.00017 | $0.00226 |
| Haiku 4.5 | $0.00009 | $0.00113 |
Grade A, and why
agentskills-io scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 118 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Agent Skills (agentskills.io)
Create portable skills for AI agents. Works with Claude Code, Cursor, GitHub Copilot, OpenAI integrations, VS Code (symlinks enable sharing across tools).
Resources
- Specification: https://agentskills.io/specification | Validator: https://github.com/agentskills/agentskills
Structure
skill-name/
├── SKILL.md # Required (frontmatter + instructions, <5000 tokens activation)
├── scripts/ # Optional: executable code
├── references/ # Optional: detailed docs
└── assets/ # Optional: templates, static files
Rules: Dir name = frontmatter name:. Only 3 subdirs. SKILL.md <500 lines. ~100 tokens for discovery (name+desc).
Frontmatter
Required
name: 1-64 chars, lowercase alphanumeric-hyphens (^[a-z0-9]+(-[a-z0-9]+)*$)description: 1-1024 chars, include "Use when..." (discovery budget: ~100 tokens)
Optional
license: SPDX identifier (Apache-2.0, MIT) |compatibility: Environment reqs (<500 chars)metadata: Key-value pairs (author, version, tags) |allowed-tools: Space-delimited tool list
Validation
# Install permanently (vs ephemeral uvx)
uv tool install git+https://github.com/agentskills/agentskills#subdirectory=skills-ref
# Or use uvx for one-shot validation
uvx --from git+https://github.com/agentskills/agentskills#subdirectory=skills-ref skills-ref validate ./skill
| Command | Description |
|---|---|
skills-ref validate <path> |
Check structure, frontmatter, token budgets |
skills-ref read-properties <path> |
Extract metadata |
skills-ref to-prompt <path> |
Generate prompt format |
Writing Rules
- Imperative language: "Check:
command" not "You might want to..." - Concrete examples with expected output; handle common errors with solutions
- Progressive disclosure: core in SKILL.md (<5000 tokens), details in references/
Common Errors
| Error | Fix |
|---|---|
| Invalid name | Lowercase alphanumeric-hyphens only |
| Missing description | Add description: field with "Use when..." |
| Description too long | <1024 chars, move details to body |
| Invalid YAML | Check indentation, quote special chars |
| Missing SKILL.md | Filename must be exactly SKILL.md |
| Dir name mismatch | Directory name must match name: field |
What ships with it
7 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.
- 5d ago First seen · 118 lines · 86 tokens per session scan A 65853044a6d7
agentskills-io is a skill published in the GitHub repository Agentic-Insights/foundry (5 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 86 tokens to every session and 1,131 once invoked, about $0.0004 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 2026-08-31.
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