---
created: 2026-05-16
modified: 2026-05-16
type: note
tags:
  - ai
  - dev-ops
aliases: []
---

# Pi Agent Extensions & Skills

## Source Repositories

| Source | Location |
|---|---|
| Gitea (package) | `git:https://gitea.lab.audasmedia.com.au/sam/pi-config` |
| Local filesystem | `~/.agents/` |
| Project settings | `sys_config/.pi/settings.json`, `ai_setup/.pi/settings.json` |

---

## Extensions

| Extension | Source | Purpose |
|---|---|---|
| **pi-config** | `~/.agents` | `/config-add`, `/config-remove`, `/config-show`, `/config-setup` — manage which extensions/skills are active in a project |
| **tavily-search** | Gitea | `tavily_search` — web search via Tavily API (AI-optimized) |
| **web-fetch** | `~/.agents` | `web_fetch` — fetch any URL and return clean markdown (HTML, PDF, JS-rendered with Jina fallback) |
| **ask-user-question** | `~/.agents` | `ask_user_question` — LLM presents structured multiple-choice / text questions with keyboard UI |
| **video-extract** | `~/.agents` | `video_extract` — extract frames from YouTube/local video + full Gemini analysis (requires ffmpeg + yt-dlp + GEMINI_API_KEY) |
| **filechanges** | `~/.agents` | `/filechanges`, `/filechanges-accept`, `/filechanges-decline` — tracks every file LLM edits/writes, diff review, revert |
| **pi-subagents** (tintinweb v0.7.1) | `~/.agents` | Spawn child Pi agents for delegated tasks (scout, researcher, worker) |
| **pi-prompt-template-model** | npm (global) | Model-switching prompt templates with frontmatter. See [[#Prompt Templates]] section below |
| **pi-graphify** | `~/.agents` | Knowledge graph tools: build, query, path tracing, explain, watch, add, update |
| **plannotator** | `~/.agents` | Interactive plan review with browser UI, annotations, code review |
| **caveman** | `~/.agents` | Ultra-compressed communication mode |

---

## Skills

| Skill | Purpose |
|---|---|
| **nixos-workflow** | STRICT workflow for managing Pi assets via Gitea on NixOS |
| **system-architect** | Multi-machine NixOS infrastructure (Snapcast, MQTT, Docker, Nvim) |
| **obsidian-cli** | Interact with Obsidian vault (notes, search, plugin dev, theme dev) |
| **graphify** | Full-pipeline knowledge graph orchestration |
| **caveman** | Caveman communication mode |
| **openspec-propose** | Propose new changes with design docs, specs, tasks |
| **openspec-apply-change** | Implement tasks from an OpenSpec change |
| **openspec-archive-change** | Archive completed changes |
| **openspec-explore** | Explore ideas and clarify requirements |

---

## Prompt Templates

Prompt templates are `.md` files in `~/.pi/agent/prompts/` with YAML frontmatter. Each defines a slash command that auto-switches model, thinking level, and injects skills — then restores your previous model when done.

### Installed Templates

| Command | Model | Thinking | Use |
|---|---|---|---|
| `/quick` | deepseek-v4-flash | — | Fast, cheap tasks |
| `/deep` | kimi-k2.5 | high | Deep analysis, architecture |
| `/review` | kimi-k2.5 | medium | Code review |
| `/nix-check` | qwen-2.5 | low | Run checks + analyze |
| `/research` | deepseek-v4-flash | — | Web research, synthesize |

### How to use

```
/quick what's the weather?
/deep design the architecture for this feature
/review review the changes in this file
/nix-check analyze the nix flake check output
/research find alternatives to this approach
```

### Template format

```yaml
---
description: Quick task — fast model, minimal thinking
model: openrouter/deepseek-v4-flash
restore: true
---
$@
```

Key frontmatter fields:
- **`model`** — provider/model-id or comma-separated fallback list
- **`thinking`** — off, minimal, low, medium, high, xhigh
- **`restore`** — (default true) restore previous model when done
- **`skill`** — auto-inject a skill
- **`deterministic`** — run a command/script before the LLM turn (e.g. `nix eval .#checks`)

### Adding new templates

Create a new `.md` file in `~/.pi/agent/prompts/` with frontmatter. The filename becomes the command name. Restart Pi or run any extension command to pick them up.

---

## Configuration Files

### Global (`~/.pi/agent/settings.json`)
- Nix store symlink — managed via `/etc/nixos/home/sam/home.nix`
- Contains: providers (opencode-go, openrouter, google), packages (pi-memctx, pi-prompt-template-model, Gitea)
- **Read-only** — cannot be modified by `pi install` or `/config-add`

### Project (`<project-dir>/.pi/settings.json`)
- Overrides global settings (arrays replace, not merge)
- Contains: `~/.agents` package (extensions + skills), Gitea package (tavily-search)
- Modified via `/config-add` / `/config-remove` commands

### Per-folder Memory (via pi-memctx)
- Memory stored in `<chat-folder>/.pi/memory-vault/packs/`
- Workspace map at `~/.pi/agent/memory-vault/00-system/workspace-map.json`
- Each chat folder has isolated memory (prevents sibling directory contamination)

---

## Useful Commands

| Command | What it does |
|---|---|
| `/quick <task>` | Fast model for quick tasks |
| `/deep <task>` | Powerful model with extended thinking |
| `/review <path>` | Thorough code review |
| `/nix-check <task>` | Nix-specific analysis |
| `/research <topic>` | Web research and synthesis |
| `/config-setup` | One-shot: creates `.pi/`, `settings.json`, memory vault in current folder |
| `/config-add ext <name>` | Activate an extension from `~/.agents` |
| `/config-add skill <name>` | Activate a skill from `~/.agents` |
| `/config-show` | Show active extensions and skills |
| `/memctx-init` | Scan folder, build initial memory pack |
| `/memctx-status` | Show memory status |
| `/memctx-refresh` | Re-scan and enrich memory |
| `/filechanges` | Review changed files, diffs, accept/decline |
| `/filechanges-accept` | Accept all changes |
| `/filechanges-decline` | Revert all changes |

---

## Skipped / Bookmarked

| Extension/Skill | Reason |
|---|---|
| **web-search** (amosblomqvist) | ❌ Redundant — Tavily does this |
| **subagents** (amosblomqvist) | ❌ Redundant — pi-subagents already installed |
| **bash-guard** (amosblomqvist) | ❌ Too aggressive — would interrupt flow |
| **google-image-search** (amosblomqvist) | ❌ Would need Google Search API + CSE setup |
| **pdf-reader** (amosblomqvist) | ⏳ Bookmarked — Python + pymupdf setup needed |
| **notify** (mitsuhiko) | ⏳ Minor QoL — desktop notifications on task complete |

---

## Tasks

- [ ] Rebuild NixOS to activate Google provider + ffmpeg/yt-dlp + pi-prompt-template-model
- [ ] Run `/reload` in Pi to activate filechanges and new templates
- [ ] Add more prompt templates to `~/.pi/agent/prompts/` as needed
- [ ] Verify video-extract works with Gemini
- [ ] Clean up workspace-map.json entries for any stale memory packs