PIM - Pi IMproved

Pim is to Pi what Vim is to Vi.

A Bun-native extension pack for Pi: web access, subagents, revamped core tools, ANSI-compatible themes, fzf-style completions, Telegram mode, and more. Preliminary score of 37.8% on Terminal-Bench 2.0 with locally hosted Qwen3.6-35B, rivalling Claude Code + Sonnet 4.5.

• Quick Start
  • Enabling/Disabling Extensions
  • API Keys (Optional)
  • Recommended Pi Settings (Optional)
• Why Pim?
  • Lean System Prompt
  • Model-Aware Tools
  • Terminal-Bench 2.0
• Agent Tools
• Terminal UI
• Telegram Bot
  • Setup
  • Commands
  • Features
• Changelog
• Developing

Quick Start

Ensure that you have Pi and Bun already installed. If not, install them first (or ask your agent to do it for you). For all things related to Pi, refer to Pi's comprehensive docs.

# First, install Pim as a Pi extension:
pi install npm:@aaroncql/pim-agent

# Then, install the Bun-native `pim` launcher:
bun install -g @aaroncql/pim-agent

# Finally, launch pim:
pim

[!IMPORTANT] Use pim instead of pi after installing Pim. The pim command is a drop-in replacement for pi that runs Pi via Bun, enabling Bun-specific APIs. Existing Pi behaviour and extensions should continue to work normally.

If pim cannot locate Pi, make sure pi is on your PATH, or set:

PIM_PI_CLI=/path/to/pi/dist/cli.js pim

Enabling/Disabling Extensions

Pim ships a collection of extensions which are all enabled by default. To disable specific ones that don't suit your needs, run pim config and toggle them there.

Some Pim extensions can be toggled directly within the TUI as well: /powerline for the Git-aware powerline footer, /tps for inference speed reporting.

API Keys (Optional)

Pim's web tools use Exa for searching the web and Jina for fetching websites as Markdown. These tools still work without API keys, but are subject to the following rate limits (as of May 2026):

• Exa - 1,000 requests per month
• Jina - 20 requests per minute

For heavier usage, add API keys to ~/.pim/settings.json:

{
  "exa": {
    "apiKey": "api_key_here"
  },
  "jina": {
    "apiKey": "api_key_here"
  }
}

Environment variables override settings.json when present:

EXA_API_KEY='api_key_here' JINA_API_KEY='api_key_here' pim

Recommended Pi Settings (Optional)

Add the following settings to your ~/.pi/agent/settings.json for the best experience with Pim:

{
  "quietStartup": true,
  "editorPaddingX": 1,
  "markdown": {
    "codeBlockIndent": ""
  }
}

Why Pim?

Pim's philosophy is opinionated but minimal. Its goal is to improve the out-of-the-box experience for both users and agents, without sacrificing composability with other Pi extensions.

Lean System Prompt

Pim's system prompt is just ~3K tokens despite exposing 10+ tools, far leaner than alternatives like OpenCode (~10K) or Hermes (~16K).

This is achieved by having tool descriptions focus on how to use each tool instead of prescribing when, since models already appear to internally encode when tools are needed, and prompting them to call tools can suppress both necessary and unnecessary calls.

Model-Aware Tools

LLMs are increasingly post-trained for specific agent harnesses, making tool schemas part of the model's learned interface. For text-file editing, Anthropic models are trained to use string replacement operations, while OpenAI models use V4A patch operations.

Pim keeps the active toolset model-aware instead of assuming one tool fits every LLM. It dynamically exposes the tools best suited to the selected model, giving each model the interface that best matches its learned behaviour while keeping the prompt lean.

Terminal-Bench 2.0

| ID | Pim Version | LLM / Model | Results | | --- | --- | --- | --- | | r1 | 21d084d1 | Qwen3.6-35B-A3B-UD-Q6_K_XL.gguf | 41.6% (37/89) | | r2 | bfd792cf | Qwen3.6-35B-A3B-UD-Q6_K_XL.gguf | 36.0% (32/89) | | r3 | cd52f3a4 | Qwen3.6-35B-A3B-UD-Q6_K_XL.gguf | 36.0% (32/89) |

Preliminary aggregate score of 37.8% from 3 independent runs. Each ran on an incremental build of Pim, though changes between runs were minor and none were tuned to the benchmark. Pim's subagent tool was disabled for all runs to keep each trial single-agent.

On average, Pim solves ~54% more tasks than little-coder with the same Qwen3.6-35B model (37.8% vs 24.6%). This also places Pim in a similar tier to Claude Code + Sonnet 4.5 (40.1%), and above Codex + GPT-5-Mini (31.9%).

The Qwen3.6-35B model is hosted via llama.cpp on an M4 Pro 48GB MacBook, with the following config:

llama-server \
  -c 131072 \
  -ngl 99 \
  --slot-save-path /tmp/llama-slots \
  --flash-attn on \
  --cache-type-k q8_0 \
  --cache-type-v q8_0 \
  --jinja \
  --temp 0.6 \
  --top-p 0.95 \
  --top-k 20 \
  --min-p 0.0 \
  --presence-penalty 0.0 \
  --repeat-penalty 1.0 \
  --reasoning-budget 16384 \
  --reasoning-budget-message "Alright, I've thought enough. Let me take the next concrete step now — either a tool call or a final answer — and refine based on what I learn." \
  -np 1

Note 1: results are preliminary as only 3 independent full runs were conducted; Terminal-Bench 2.0 requires 5 independent full runs under a fixed configuration for an official score.

Note 2: the gap with little-coder may be partly explained by different inference configs (128K context vs 32K, Q6_K_XL vs Q4_K_M, higher thinking budget, etc.).

Note 3: in r1 and r3, the code-from-image trial was counted as non-passing because Qwen autonomously searched for the answer online after legitimately trying for a while.

Note 4: see the benchmarks/terminal_bench_2 dir for breakdown of results and reproduction steps.

Agent Tools

Pim revamps Pi's default tools (bash, read, write, edit) so they produce consistent behaviour and output, cross-reference each other where useful, and render uniformly in the TUI. It also adds:

• apply_patch - V4A patch editing, dynamically exposed instead of edit for OpenAI models
• glob - file enumeration by glob pattern, sorted newest-first, respects .gitignore
• grep - regex search across files with context lines, multiline matching, respects .gitignore
• web_search - search the web via Exa with ranked results and snippets
• web_fetch - fetch websites as Markdown via Jina, with browser-rendered fallback via Bun.WebView
• subagent - delegate complex work to isolated sub-sessions with full tool access
• todo - in-session task list with a live widget in the UI footer

Terminal UI

Pim also ships with quality of life improvements for the TUI:

• ANSI-compatible themes - pim-light and pim-dark themes which adapt to your terminal's colour scheme
• fzf-style autocomplete - @path file picker and /command picker with fuzzy search
• Git-aware powerline footer - cwd, git branch and states, context usage, model and session cost (toggle with /powerline)
• TPS reporting - per-cycle decode/prefill rate, TTFT, and cache read tokens (toggle with /tps)
• Concise tool UI - minimal one-liner title across all tool calls, Ctrl+O to toggle full details

Telegram Bot

Run Pim as a Telegram bot with full agent capabilities in your DMs or group chats (supports threads).

Setup

Create ~/.pim/telegram/config.json with your bot token (from @BotFather) and an allowlist of chat IDs the bot will respond to:

{
  "token": "YOUR_TELEGRAM_BOT_TOKEN",
  "allow": [123456789, 987654321]
}

Then, install and run as a persistent daemon (recommended):

# Supports Linux (systemd) and macOS (launchd)
pim --mode telegram --install

# Tear down
pim --mode telegram --uninstall

The daemon auto-restarts on failure and supports the /update command for in-chat updates.

For development, run standalone with pim --mode telegram instead.

Commands

[!TIP] Use /commands on your bot for all commands to show up on your Telegram UI.

| Command | Description | | ------------ | -------------------------------------------------- | | /cancel | Cancel the current turn | | /cd | Show or change the working directory | | /chatid | Show this chat's numeric ID | | /clear | Reset chat history and context window | | /commands | Register all commands with Telegram | | /compact | Compact the current session context | | /effort | Show or change thinking effort level | | /logs | Show or change log verbosity | | /model | Show or change the AI model | | /temporary | Toggle temporary chat (fresh session each message) | | /update | Update the bot to the latest version | | /usage | Show context window and session cost |

Features

• ⏰ Scheduled tasks - your bot can create one-time, interval, or cron-based tasks that fire automatically; ask your bot to schedule something.
• 👀 Live progress logs - use /logs to choose what you see while the agent works: final replies, tool use, intermediate text, or thinking.
• 📝 Rich Markdown - supports Telegram's rich text formatting with full markdown and LaTeX math support.
• 📎 Rich media - send photos, documents, videos, audio, and voice messages directly in chat; your bot can also send files back to you.
• 🧵 Thread-specific prompts - each chat (or thread) gets its own session and optional instructions; ask your bot to modify its instructions.

Changelog

See CHANGELOG.md for release notes.

Developing

# Link locally and launch:
bun dev

Pim is registered as a project-local Pi package via .pi/settings.json and auto-loads when launched from within this repo. Use the built-in /reload command to reload after edits without restarting.