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/chinkan/rustfox/creating-agentsnpx skills add chinkan/RustFox --skill creating-agentsgit clone --depth 1 https://github.com/chinkan/RustFoxWhat 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 | $0.00035 | $0.00879 |
| Opus 5 | $0.00017 | $0.00439 |
| Sonnet 5 | $0.00007 | $0.00176 |
| Haiku 4.5 | $0.00003 | $0.00088 |
Grade A, and why
creating-agents 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 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.
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 — 106 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Creating Agents
Agents are isolated agentic mini-loops with their own model, tool whitelist, and instruction file (AGENT.md). Use agents when you need to delegate a self-contained task to a separate LLM context — typically work that benefits from a different model, a restricted tool set, or clean isolation from the main conversation.
Skill vs Agent — When to Use Which
Use a skill (skills/) |
Use an agent (agents/) |
|---|---|
| Instruction to load into the main context | Isolated task with its own model |
| No tool calls needed, or shares main tool set | Needs a restricted tool whitelist |
| Workflow guidance or persona adjustment | Sub-task that returns a single result |
Lives in skills/<name>/SKILL.md |
Lives in agents/<name>/AGENT.md |
Agent File Format
---
name: agent-name # lowercase letters, numbers, hyphens only
description: One sentence — when to invoke this agent and what it returns.
model: provider/model-id # required: the model this agent uses
tools: [tool1, tool2] # required: exact tool names the agent may call
max_iterations: 5 # optional: default is global max (25)
tags: [tag1, tag2] # optional
---
# Agent Name
(Instructions the agent follows. Starts with what it should do on first call.)
## Protocol
1. Step one
2. Step two
3. Return final answer
Tool Names
Tools must be the exact runtime names visible to the agent:
| Category | Name format | Example |
|---|---|---|
| Built-in | plain name | read_file, write_file, execute_command |
| Skill tools | plain name | read_skill_file, write_skill_file, reload_skills |
| Agent tools | plain name | read_agent_file, write_agent_file, reload_agents |
| MCP tools | mcp_{server}_{tool} |
mcp_google-workspace_query_gmail_emails |
read_skill_file and read_agent_file are always available to every agent — no need to list them.
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 · 106 lines · 35 tokens per session scan A fad60694bec2
creating-agents is a skill published in the GitHub repository chinkan/RustFox (7 stars, last pushed 26d ago), licensed MIT. It adds 35 tokens to every session and 879 once invoked, about $0.0002 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.
Other skills, from other repositories
agent-quorum-manager
Agent skill for quorum-manager - invoke with $agent-quorum-manager.
agent-release-manager
Agent skill for release-manager - invoke with $agent-release-manager.
agent-release-swarm
Agent skill for release-swarm - invoke with $agent-release-swarm.
agent-pagerank-analyzer
Agent skill for pagerank-analyzer - invoke with $agent-pagerank-analyzer.
agent-pseudocode
Agent skill for pseudocode - invoke with $agent-pseudocode.
agent-code-analyzer
Agent skill for code-analyzer - invoke with $agent-code-analyzer.