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 romiluz13/pi-agent-skills --skill pi-momgit clone --depth 1 https://github.com/romiluz13/pi-agent-skillsWrote 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/romiluz13/pi-agent-skills/pi-mom)<a href="https://agentmods.dev/skills/romiluz13/pi-agent-skills/pi-mom"><img src="https://agentmods.dev/badge/skills/romiluz13/pi-agent-skills/pi-mom/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/romiluz13/pi-agent-skills/pi-mom"><img src="https://agentmods.dev/badge/skills/romiluz13/pi-agent-skills/pi-mom.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00116 | $0.01006 |
| Opus 5 | $0.00058 | $0.00503 |
| Sonnet 5 | $0.00023 | $0.00201 |
| Haiku 4.5 | $0.00012 | $0.00101 |
Grade A, and why
pi-mom 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 10d 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 — 41 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Pi Mom (Master Of Mischief)
Grounding
pi-mono/packages/mom/README.md— features, workspace setup, memory structure (log.jsonlvscontext.jsonl), Events system.pi-mono/packages/mom/docs/events.md— detailed event JSON schema and usage.pi-mono/packages/mom/docs/sandbox.md— Docker vs host mode security isolation details.pi-mono/packages/mom/docs/slack-bot-minimal-guide.md— Slack app manifest and permissions.pi-mono/packages/mom/docs/artifacts-server.md— Express+WebSocket artifacts server, Cloudflare Tunnel for public HTTPS, file watching with chokidar, live reload, path traversal protection, date-prefixed artifact organization.pi-mono/packages/mom/docs/new.md— Multi-platform redesign: PlatformAdapter interface (Slack/Discord/CLI adapters), MomCustomTool interface withinvoke_tooldispatch, bubblewrap channel isolation, unified ChannelMessage format, per-adapter config.pi-mono/packages/mom/docs/v86.md— v86 x86 emulator sandbox evaluation: Alpine Linux in WebAssembly, 9p filesystem for host-guest exchange, state save/restore (~2s), outbound networking.
Invariants
- Dual-File History:
log.jsonlis the source of truth (append-only);context.jsonlis the compacted view sent to the LLM. - Workspace Isolation: Mom runs on the host by default (no isolation). Docker mode (
--sandbox=docker:<name>) is recommended for security — it isolates tool execution to a container where only thedata/directory is mounted to/workspace. - Event Paths: On the host, event files live in
data/events/. Inside the Docker sandbox andevents.md, that same mounted directory is referred to as/workspace/events/orworkspace/events/. - Event Limits: A maximum of 5 events can be queued per channel. Events use unique filenames to avoid overwrites.
- Artifacts Server: Runs Express on port 8080 with Cloudflare Tunnel for public URLs; file watching is recursive via chokidar; WebSocket live reload via
?ws=trueparameter —pi-mono/packages/mom/docs/artifacts-server.md. - Multi-Platform Design: Design doc defines
PlatformAdapterinterface (start,stop,getChannels,sendMessage, etc.), planned adapters (Slack, Discord, CLI),MomCustomToolinterface for host-side tool execution viainvoke_tool, and bubblewrap per-channel isolation —pi-mono/packages/mom/docs/new.md. - Custom Tool Discovery: Custom tools are discovered from
data/tools/**/index.ts(workspace-local) and~/.pi/mom/tools/**/index.ts(global), loaded viajiti—pi-mono/packages/mom/docs/new.md.
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.
- 10d ago First seen · 41 lines · 0 tokens per session scan A a7632a5e0cef
pi-mom is a skill published in the GitHub repository romiluz13/pi-agent-skills (18 stars, last pushed 4mo ago), licensed MIT. It adds 116 tokens to every session and 1,006 once invoked, about $0.0006 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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