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 skills add summarybotng/summarybot-ng --skill xp-practicesgit clone --depth 1 https://github.com/summarybotng/summarybot-ngWrote 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/summarybotng/summarybot-ng/xp-practices)<a href="https://agentmods.dev/skills/summarybotng/summarybot-ng/xp-practices"><img src="https://agentmods.dev/badge/skills/summarybotng/summarybot-ng/xp-practices.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 | $0.00039 | $0.01547 |
| Opus 5 | $0.00019 | $0.00773 |
| Sonnet 5 | $0.00008 | $0.00309 |
| Haiku 4.5 | $0.00004 | $0.00155 |
Grade A, and why
xp-practices 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 3d 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 — 233 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Extreme Programming (XP) Practices
<default_to_action> When applying XP practices:
- START with practices that give immediate value
- BUILD supporting practices gradually
- ADAPT to your context
- MEASURE results
Core XP Practices (Prioritized):
| Practice | Start Here | Why First |
|---|---|---|
| TDD | ✅ Yes | Foundation for everything |
| Continuous Integration | ✅ Yes | Fast feedback |
| Pair Programming | ✅ Yes | Knowledge sharing |
| Collective Ownership | After CI+TDD | Needs safety net |
| Small Releases | After CI | Infrastructure dependent |
Pairing Quick Start:
Driver-Navigator (Classic):
- Driver: Writes code
- Navigator: Reviews, thinks ahead
- Rotate every 20-30 min
Ping-Pong (with TDD):
A: Write failing test
B: Make test pass + refactor
B: Write next failing test
A: Make test pass + refactor
</default_to_action>
Quick Reference Card
The Five XP Values
| Value | Meaning | Practice |
|---|---|---|
| Communication | Everyone knows what everyone does | Daily standups, pairing |
| Simplicity | Simplest thing that works | YAGNI, small design |
| Feedback | Get feedback early and often | TDD, CI, short iterations |
| Courage | Tell truth, adapt | Refactor, admit mistakes |
| Respect | Everyone contributes value | Sustainable pace, pairing |
Core Practices
| Practice | Description | Benefit |
|---|---|---|
| Pair Programming | Two devs, one workstation | Quality + knowledge sharing |
| TDD | Red-Green-Refactor | Confidence + design |
| CI | Integrate multiple times/day | Fast feedback |
| Collective Ownership | Anyone can change anything | No bottlenecks |
| Sustainable Pace | 40-hour weeks | Long-term productivity |
| Small Releases | Ship frequently | Risk reduction |
Pair Programming
When to Pair
| Context | Pair? | Why |
|---|---|---|
| Complex/risky code | ✅ Always | Needs multiple perspectives |
| New technology | ✅ Always | Learning accelerator |
| Onboarding | ✅ Always | Knowledge transfer |
| Critical bugs | ✅ Always | Two heads better |
| Simple tasks | ❌ Skip | Not worth overhead |
| Research spikes | ❌ Skip | Pair to discuss findings |
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.
- 3d ago First seen · 233 lines · 39 tokens per session scan A 986acb72a1a3
xp-practices is a skill published in the GitHub repository summarybotng/summarybot-ng (2 stars, last pushed 2mo ago), licensed MIT. It adds 39 tokens to every session and 1,547 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 2026-09-03.
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