Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/JansenAnalytics/claudexnpx agentmods add skills/jansenanalytics/claudex/prompt-libraryWrote 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/jansenanalytics/claudex/prompt-library)<a href="https://agentmods.dev/skills/jansenanalytics/claudex/prompt-library"><img src="https://agentmods.dev/badge/skills/jansenanalytics/claudex/prompt-library.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 | $0.00027 | $0.00407 |
| Opus 5 | $0.00014 | $0.00204 |
| Sonnet 5 | $0.00005 | $0.00081 |
| Haiku 4.5 | $0.00003 | $0.00041 |
Grade A, and why
prompt-library 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
prompt-library
Library of tested prompt patterns for sub-agent orchestration: task decomposition, verification, error recovery, chain-of-thought.
Use When
- Designing prompts for sub-agents
- Improving task delegation quality
- Building multi-agent workflows
- Debugging sub-agent failures
- Need a proven pattern instead of ad-hoc prompting
Scripts
render-template.sh
Renders a prompt template by filling {{VARIABLE}} placeholders from CLI args or env vars.
bash scripts/render-template.sh <template-file> VAR1="value1" VAR2="value2"
task-splitter.sh
Splits a complex task description into sub-agent-ready subtasks with dependency ordering.
bash scripts/task-splitter.sh "Build a full-stack app with auth, DB, and frontend"
# Outputs numbered subtasks with dependencies noted
References
references/prompt-patterns.md— Catalog of proven patterns (task decomposition, verification, chain-of-thought, error recovery, few-shot, role-assignment)references/anti-patterns.md— Common mistakes and how to fix themreferences/orchestration-patterns.md— Multi-agent workflow patterns (fan-out, pipeline, supervisor)
Examples
Render a task decomposition prompt:
bash scripts/render-template.sh references/templates/decompose.tmpl \
TASK="Build a REST API" CONSTRAINTS="Use Python, under 200 lines"
Split a task for parallel sub-agents:
bash scripts/task-splitter.sh "Create three microservices: auth, billing, notifications"
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 · 60 lines · 27 tokens per session scan A ddf5f8563cb0
prompt-library is a skill published in the GitHub repository JansenAnalytics/claudex (5 stars, last pushed 2mo ago), licensed MIT. It adds 27 tokens to every session and 407 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 2026-09-03.
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