pi-flows

A pi-package that adds multi-agent workflow orchestration to pi. Design flows as YAML DAGs, run them with automatic parallel scheduling, and watch everything in a live TUI dashboard — while the main session stays fully interactive.

---

Overview

Flows are reusable workflow templates that coordinate multiple AI agents through structured inputs and outputs. Each agent runs in an isolated session with scoped tools and filesystem access.

Best practice usage:

• Research → Plan → Implement → Verify cycles
• Code review pipelines with verify/fix loops
• Documentation generation with multi-domain research
• Refactoring with interactive branching

Installation

pi install npm:pi-flows

Or from a local clone:

pi install /path/to/pi-flows

Quick Start

1. Create an agent (.pi/flows/agents/reviewer.md):

   ---
   name: reviewer
   description: Reviews code for quality issues
   model: @coding
   tools: read, grep, find
   inputs:
     - target_path
   ---
   Review the code for: ${{task}}
   Focus on: ${{input.target_path}}

2. Create a flow (.pi/flows/flows/review.yaml):

   name: review
   description: Research then review code
   task_required: true
   task_prompt: "What should I review?"
   
   steps:
     - id: research
       agent: project-context-reader
       task: Investigate the codebase for ${{task}}
   
     - id: review
       agent: reviewer
       blockedBy: [research]
       inputs:
         target_path: "${{result.research.summary}}"
       task: Review based on research findings

3. Run it:

   /review Fix the auth middleware
   

Commands & Keybindings

Command	Description
/flows	Manage flows (new, edit, delete)
/flows:new	Design & run a new flow with the Flow Architect
/flows:edit	Edit an existing flow
/flows:delete	Delete a flow
/roles	Assign models to role tiers (@coding, @planning, etc.)
Ctrl+A	Toggle auto-routing (agents decide fork branches autonomously)
Ctrl+X	Abort running flow

Flows also register as slash commands based on file path: .pi/flows/flows/review.yaml → /review.

Core Concepts

• Agents — Markdown files with YAML frontmatter (config) and body (system prompt). Run in isolated sessions with scoped tools and file access.
• Flows — YAML files defining a DAG of steps connected via blockedBy. The engine schedules independent steps in parallel, up to max_concurrent.
• Template variables — ${{task}}, ${{result.step-id.summary}}, ${{input.name}} wire data between steps at dispatch time.
• Model roles — @coding, @planning, @research, @compact map to concrete models via /roles. Each agent declares which tier it needs.
• Flow Architect — A built-in AI agent (/flows:new) that analyzes your conversation context, selects agents from the catalog, and designs a complete flow DAG.

Writing Agents

Agents are .md files in .pi/flows/agents/ (project-local) or a package's agents/ directory.

---
name: backend-dev
description: Implements backend changes
model: @coding
thinking: high
tools: read, write, edit, grep, bash
inputs:
  - research_context
outputs:
  - verdict
access:
  read: ["src/**"]
  write: ["src/main/**"]
  bash:
    deny: ["rm -rf"]
card:
  label: "Backend Dev"
  metric: developer
---
You are a backend developer. Task: ${{task}}
Context: ${{input.research_context}}

Key fields: model (role tier), tools (allowlist — guard blocks everything else), inputs/outputs (typed data flow), access (filesystem sandbox), card (TUI dashboard rendering).

Writing Flows

Step Types

Agent — dispatch a named agent with a task:

- id: impl
  agent: backend-dev
  blockedBy: [research]
  inputs:
    research_context: "${{result.research.summary}}"

Fork — present a choice to the user (or let an agent decide in auto-routing mode):

- id: choose
  type: fork
  question: "Which approach?"
  options: [Quick fix, Full refactor]
  branches:
    Quick fix: quick-step
    Full refactor: refactor-step
  agent: flow-decision    # used when Ctrl+A is active

Conditional — branch on whether a result field is empty:

- id: check
  type: conditional
  check: researcher.artifacts
  present: process-step
  absent: skip-step

Agent Loop Decision — iterative verify/fix cycles:

- id: verify-loop
  type: agent-loop-decision
  agent: flow-decision
  task: "Check iteration ${{loop.verify-loop.iteration}}/${{loop.verify-loop.max}}"
  loop_target: fixer
  exit_target: done
  max_iterations: 3

Flow Reference — delegate to a sub-flow:

- id: run-tests
  type: flow-ref
  path: .pi/flows/flows/test-suite.yaml

Input Wiring

Steps pass data through inputs + template variables:

- id: researcher
  agent: researcher
  task: Investigate ${{task}}

- id: developer
  agent: developer
  blockedBy: [researcher]
  inputs:
    context: "${{result.researcher.summary}}"
    spec: file://specs/api-spec.md    # injects file content

The agent's prompt references inputs as ${{input.context}}. Typed outputs declared in agent frontmatter (outputs:) are accessible as ${{result.step-id.outputName}}.

TUI Dashboard

When flows run, a live dashboard appears with agent cards in a grid layout. Each card shows status, elapsed time, and domain-specific metrics (files modified, tests passed, etc.). Navigate with arrow keys, expand agent detail views, and see the full flow summary after completion.

Card types (card.metric): developer, researcher, tester, verifier, writer, default — or register custom renderers via flow:register-card.

Built-in Agents

Agent	Role	Description
flow-architect	Orchestrator	Designs flows from conversation context using agent_catalog
flow-decision	Router	Makes branch/loop decisions for fork and loop steps
project-context-reader	Researcher	Reads and summarizes project structure

Developer Docs

Detailed documentation in the docs/ folder:

• Flows Reference — Complete step type reference with syntax and examples
• Agents Reference — Agent frontmatter schema, model tiers, card types
• Flow Authoring — Full format reference for agent and flow files
• Architecture — Internal design: DAG execution, agent isolation, sub-extensions
• Events API — Register custom cards, tools, and listen to flow events
• Public API — Core TypeScript types and functions for programmatic use
• Skills & Extensions — Skill bundles and extension registration
• Tools Reference — Built-in tools available to agents
• Creating Packages — Build domain packages with custom agents and flows
• Extending pi-flows — Advanced customization

License

MIT