clarity-pi 0.54.4

Python port of pi-mono: coding agent with multi-provider LLM support, TUI, agent loop, and tools

pi-mono-python

Python port of the pi-mono TypeScript monorepo — four packages with aligned code, logic, algorithms, and folder structure.

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TypeScript	Python	Description
@mariozechner/pi-ai	pi_ai	Unified LLM streaming layer (Google, Anthropic, OpenAI, Bedrock, …)
@mariozechner/pi-agent-core	pi_agent	Agent loop, tool execution, state management
@mariozechner/pi-coding-agent	pi_coding_agent	Coding agent CLI with file tools: read, write, edit, bash, grep, find, ls
@mariozechner/pi-tui	pi_tui	Terminal UI library with differential rendering engine

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Installation

Prerequisites

• Python 3.11+ — Check with python3 --version
• uv — Fast Python package manager

Install uv if you don't have it:

curl -LsSf https://astral.sh/uv/install.sh | sh

Clone and Install

git clone https://github.com/openxjarvis/pi-mono-python.git
cd pi-mono-python

# Install all four packages and their dependencies in one step
uv sync

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Quick Start

1. Configure API Keys

Create .env in the project root:

# Google Gemini (recommended default)
GEMINI_API_KEY=your_key_here

# Optional — add whichever providers you need
ANTHROPIC_API_KEY=
OPENAI_API_KEY=
GOOGLE_API_KEY=        # alternative to GEMINI_API_KEY
AWS_ACCESS_KEY_ID=     # for AWS Bedrock
AWS_SECRET_ACCESS_KEY=

Important: .env is loaded automatically at runtime. Never commit it to git.

2. Launch the Interactive TUI

uv run --package pi-coding-agent pi

This opens the full-featured terminal UI where you can chat with the coding agent.

Keyboard shortcuts:

Key	Action
Enter	Send message
Shift+Enter	New line in input
/	Slash command completion
@	File path completion
Ctrl+P	Cycle to next model
Ctrl+C / Esc	Quit

3. Try a Simple Task

Type in the terminal:

Create a Python function to calculate fibonacci numbers

The agent will write the code and save it to your current directory.

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Common Use Cases

Single Prompt (Non-Interactive)

For scripting or quick tasks:

uv run --package pi-coding-agent pi --print "Write a quicksort in Python"

The agent's response prints to stdout and exits.

Switch Models

# Use a specific model
uv run --package pi-coding-agent pi --model gemini-2.5-pro-preview

# Use a provider + model name
uv run --package pi-coding-agent pi --provider google --model gemini-2.0-flash

# List all available models
uv run --package pi-coding-agent pi --list-models

Resume Previous Sessions

# Continue the most recent session
uv run --package pi-coding-agent pi --continue

# Pick from a list of previous sessions
uv run --package pi-coding-agent pi --resume

Slash Commands in TUI

Type / in the interactive TUI to see available commands:

Command	Description
/model <name>	Switch to a different model
/thinking <level>	Set thinking detail: minimal · low · medium · high · xhigh
/compact	Compress conversation context to save tokens
/session	Show session statistics (tokens used, cost estimate)
/tools	List all active tools available to the agent

Full CLI Help

uv run --package pi-coding-agent pi --help

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Running Tests

All tests

uv run pytest

Per-package

uv run pytest packages/tui/tests/          # TUI components
uv run pytest packages/ai/tests/           # AI providers
uv run pytest packages/agent/tests/        # Agent core
uv run pytest packages/coding-agent/tests/ # CLI + coding agent

Live API tests (requires GEMINI_API_KEY)

uv run pytest packages/ai/tests/ --live -v

# Or via environment variable
LIVE_TESTS=1 uv run pytest packages/ai/tests/ -v

All tests run against mocks by default — no API key required, no quota consumed.

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Test Status

Package	Tests	Status
pi_tui	135	✅ passed
pi_ai + pi_agent	156	✅ passed (7 skipped = live-only)
pi_coding_agent	287	✅ passed
Total	578	✅ all passing

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Project Structure

pi-mono-python/
├── .env                          ← API keys (never commit)
├── pyproject.toml                ← uv workspace root
├── conftest.py                   ← global pytest config (.env loader)
└── packages/
    ├── ai/                       ← LLM provider layer
    │   └── src/pi_ai/
    │       ├── providers/        ← google.py, openai.py, anthropic.py, …
    │       ├── stream.py         ← unified stream_simple() / complete_simple()
    │       └── utils/            ← overflow detection, JSON parse, …
    ├── agent/                    ← core agent loop
    │   └── src/pi_agent/
    │       ├── agent.py          ← main run loop
    │       ├── tools/            ← tool registry & execution
    │       └── session.py        ← session state
    ├── coding-agent/             ← CLI entry point & extensions
    │   └── src/pi_coding_agent/
    │       ├── cli.py            ← `pi` command
    │       ├── core/             ← AgentSession, system prompt, tools
    │       └── modes/interactive/← TUI interactive mode
    └── tui/                      ← terminal UI library
        └── src/pi_tui/
            ├── components/       ← Editor, SelectList, Markdown, …
            ├── tui.py            ← differential rendering engine
            └── keys.py           ← Kitty keyboard protocol parser

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TypeScript → Python Mapping

TypeScript	Python
interface X {}	class X(BaseModel): or @dataclass
type X = A | B	X = Union[A, B]
async function f()	async def f()
AsyncIterable<T>	AsyncGenerator[T, None]
AbortSignal	asyncio.Event (cancellation token)
EventEmitter	dict[str, list[Callable]]
TypeBox schema	pydantic.BaseModel
vitest	pytest + pytest-asyncio

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FAQ

Problem	Solution
uv: command not found	Run the install script: curl -LsSf https://astral.sh/uv/install.sh | sh
GEMINI_API_KEY not set	Add your key to .env
ModuleNotFoundError: pi_tui	Use uv run --package pi-coding-agent pi instead of python directly
TUI shows garbled characters	Ensure your terminal supports UTF-8 (iTerm2, Warp, or any modern terminal)
Tests are skipped	Add --live to run real API tests
400 thought_signature error	Upgrade to the latest version — this is fixed in the google provider