Oh My Pi is a coding agent with an integrated development environment, command-line interface, tools, language-server operations, and debugger operations. It is used by developers who want an AI coding assistant that can read and edit projects, work with models from multiple providers, and interact with development tools. The catalogue add-ons extend its agent workflows with skills, commands, agents, plugins, MCP, and instructions.
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 can1357/oh-my-pi --skill system-promptsgit clone --depth 1 https://github.com/can1357/oh-my-piWrote 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/can1357/oh-my-pi/system-prompts)<a href="https://agentmods.dev/skills/can1357/oh-my-pi/system-prompts"><img src="https://agentmods.dev/badge/skills/can1357/oh-my-pi/system-prompts/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/can1357/oh-my-pi/system-prompts"><img src="https://agentmods.dev/badge/skills/can1357/oh-my-pi/system-prompts.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Snyk pass
- NVIDIA SkillSpector pass
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 | $0.00040 | $0.02254 |
| Opus 5 | $0.00020 | $0.01127 |
| Sonnet 5 | $0.00008 | $0.00451 |
| Haiku 4.5 | $0.00004 | $0.00225 |
Grade A, and why
system-prompts scanned grade A with 1 finding 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 12d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
- `read.md`: enumerate every covered source — file/dir/archive/sqlite/PDF/URL — so agent avoids `cat`/`curl`/`tar`; omit chunker, binary sniffer, cache layer. How it starts
The opening of the file, as written. The whole thing — 183 lines — stays where its author put it; the contents beside it link to each section on GitHub.
System Prompts
House style: dense, imperative, RFC-keyed.
Small models (≤2B; tiny/on-device, e.g. LFM2): MUST read small-models.md. Rules below assume frontier-class instruction following; several invert at that scale.
Tags
Tags: authoritative, literal structural markers; meaning exactly matches name. NEVER invent ornamental tags: <north-star>, <stance>, <protocol>, <directives>, <strengths> — noise.
| Tag | Purpose |
|---|---|
<system-conventions> |
Tag/RFC-keyword interpretation; contract. |
<stakes> |
Correctness importance; domain framing. |
<communication> |
Voice, tone, response shape. |
<critical> |
Inviolable rules; place at START and END. |
<completeness> |
Done definition; anti-shrink rules. |
<yielding> |
Pre-yield checklist; block conditions. |
<workflow> |
Numbered phases: scope → edit → decompose → work → verify. |
Normative Language
RFC 2119: full caps, no bold; all-caps form is the marker.
| Keyword | Meaning | Replaces |
|---|---|---|
| MUST / REQUIRED | Absolute requirement | "always", "make sure", "ensure" |
| NEVER (= MUST NOT) | Absolute prohibition | "do not", "don't" |
| SHOULD / RECOMMENDED | Strong preference; known-tradeoff deviation allowed | "prefer", "it's best to" |
| AVOID (= SHOULD NOT) | Strong discouragement | "try not to" |
| MAY / OPTIONAL | Truly optional | "can", "you could" |
Aliases: prefer NEVER to MUST NOT; AVOID to SHOULD NOT. Both: single-token in cl100k/o200k; identical authority.
Near top, inside <system-conventions>, state once:
RFC 2119 applies to MUST, REQUIRED, SHOULD, RECOMMENDED, MAY, OPTIONAL.
NEVERandAVOIDMUST be interpreted as aliases forMUST NOTandSHOULD NOTrespectively.
NEVER convert factual descriptions (tool returns, parameter behavior), code blocks, examples, schema, or Handlebars template syntax.
Density
Load-bearing tokens only; every bullet adds a claim.
- One claim/bullet; cut behavior-neutral subclauses.
- Quick check
X? Y.replaces “If X, then Y.” - Reasoning ONLY when it changes the call.
- Bold lead names rule; NEVER restate in body.
- Prefer
→,=,+/</-,B+1,A..B. - Parallel edits:
add → +/<; delete → -; = ONLY when modifying inside.
What ships with it
1 file 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.
- 12d ago First seen · 183 lines · 40 tokens per session scan A a81d288bcf2e
system-prompts is a skill published in the GitHub repository can1357/oh-my-pi (30,473 stars, last pushed yesterday), licensed MIT. It adds 40 tokens to every session and 2,254 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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