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/agentsys/learnnpx skills add agent-sh/agentsys --skill learngit clone --depth 1 https://github.com/agent-sh/agentsysWhat 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 | $0.00039 | $0.02198 |
| Opus 5 | $0.00019 | $0.01099 |
| Sonnet 5 | $0.00008 | $0.00440 |
| Haiku 4.5 | $0.00004 | $0.00220 |
Grade A, and why
learn scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 349 lines — stays where its author put it; the contents beside it link to each section on GitHub.
learn
Research any topic by gathering online resources and creating a comprehensive learning guide with RAG-optimized indexes.
Parse Arguments
const args = '$ARGUMENTS'.split(' ').filter(Boolean);
const depth = args.find(a => a.startsWith('--depth='))?.split('=')[1] || 'medium';
const topic = args.filter(a => !a.startsWith('--')).join(' ');
Input
Arguments: <topic> [--depth=brief|medium|deep]
- topic: Subject to research (required)
- --depth: Source gathering depth
brief: 10 sources (quick overview)medium: 20 sources (default, balanced)deep: 40 sources (comprehensive)
Research Methodology
Based on best practices from:
- Anthropic's Context Engineering
- DeepLearning.AI Tool Use Patterns
- Anara's AI Literature Reviews
1. Progressive Query Architecture
Use funnel approach to avoid noise from long query lists:
Broad Phase (landscape mapping):
"{topic} overview introduction"
"{topic} documentation official"
Focused Phase (core content):
"{topic} best practices"
"{topic} examples tutorial"
"{topic} site:stackoverflow.com"
Deep Phase (advanced, if depth=deep):
"{topic} advanced techniques"
"{topic} pitfalls mistakes avoid"
"{topic} 2025 2026 latest"
2. Source Quality Scoring
Multi-dimensional evaluation (max score: 100):
| Factor | Weight | Max | Criteria |
|---|---|---|---|
| Authority | 3x | 30 | Official docs (10), recognized expert (8), established site (6), blog (4), random (2) |
| Recency | 2x | 20 | <6mo (10), <1yr (8), <2yr (6), <3yr (4), older (2) |
| Depth | 2x | 20 | Comprehensive (10), detailed (8), overview (6), superficial (4), fragment (2) |
| Examples | 2x | 20 | Multiple code examples (10), one example (6), no examples (2) |
| Uniqueness | 1x | 10 | Unique perspective (10), some overlap (6), duplicate content (2) |
Selection threshold: Top N sources by score (N = depth target)
3. Just-In-Time Retrieval
Don't pre-load all content (causes context rot):
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 · 349 lines · 39 tokens per session scan A acceb5ab1d3c
learn is a skill published in the GitHub repository agent-sh/agentsys (980 stars, last pushed 5d ago), licensed MIT. It adds 39 tokens to every session and 2,198 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 2026-08-30.
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