A terminal-based coding agent built on Google ADK Go with multi-provider LLM support, sandboxed tool execution, LSP integration, and a subagent system.

• Multi-provider LLM — Claude (Anthropic), GPT/O-series (OpenAI), Gemini (Google), and Ollama for local models
• Sandboxed tools — File read/write/edit, shell execution, grep, find, tree, and git operations, all restricted to the project directory via os.Root
• Interactive TUI — Bubble Tea v2 terminal UI with Markdown rendering (Glamour), slash commands, and theming
• Session persistence — JSONL append-only event logs with branching, compaction, and resume
• Model roles — Named configurations (default, smol, slow, plan, commit) selectable via CLI flags
• Subagents — Process-based multi-agent system with types: explore, plan, designer, reviewer, task, quick_task
• LSP integration — JSON-RPC client for Go, TypeScript/JS, Python, Rust with auto-format and diagnostics hooks
• AI Git tools — Repository overview, file diffs, hunk parsing, and LLM-generated conventional commits (/commit)
• RPC server — Unix socket JSON-RPC 2.0 for IDE/editor integration
• Extensions — Hooks (shell callbacks), skills (.SKILL.md instructions), and MCP server support
• Skills audit — Security scanning for hidden Unicode characters, BiDi attacks, and supply-chain threats in skill files (pi audit)

cmd/pi/             Entry point — CLI parsing, output mode selection
internal/
├── agent/          ADK agent setup, retry logic, runner
├── cli/            Cobra CLI flags, output modes (interactive, print, json, rpc)
├── config/         Global and project config (roles, hooks, MCP, themes)
├── audit/          Security scanner for skills (hidden Unicode, supply-chain threats)
├── extension/      Hooks, skills, MCP server integration
├── lsp/            LSP JSON-RPC client, language registry, manager, hooks
├── provider/       LLM providers implementing genai model interface
├── rpc/            Unix socket JSON-RPC 2.0 server
├── session/        JSONL persistence, branching, compaction
├── subagent/       Process spawner, orchestrator, concurrency pool
├── tools/          Sandboxed tools (read, write, edit, bash, grep, find, git, lsp)
└── tui/            Bubble Tea v2 UI, slash commands, commit workflow

User input → CLI → Agent → LLM provider → Tool calls → Sandbox → Response → TUI
                     ↕                        ↕
              Session store              LSP servers
              (JSONL events)          (format, diagnostics)

See ARCHITECTURE.md for detailed documentation.

• Go 1.25+
• At least one LLM provider API key (ANTHROPIC_API_KEY, OPENAI_API_KEY, GEMINI_API_KEY) or a running Ollama instance

make build      # build the pi binary
make test       # run unit tests
make lint       # go vet
make e2e        # run E2E integration tests
make clean      # remove binary

# Default interactive mode
./pi

# Select a model by prefix
./pi --model claude:sonnet
./pi --model openai:gpt-4o
./pi --model gemini:gemini-2.5-pro
./pi --model ollama:qwen3.5:latest
./pi --model minimax-m2.5:cloud #automatically detect ollama if :cloud

# Use model roles
./pi --smol          # fast, cheap model
./pi --slow          # most capable model
./pi --plan          # planning-oriented model

# Additional options
./pi --continue      # continue last session
./pi --session <id>  # resume specific session
./pi --system "..." # custom system instructions
./pi --url "..."    # custom API endpoint URL

# Non-interactive modes
./pi --mode print "explain this codebase"
./pi --mode json "list all TODO comments"
./pi --mode rpc --socket /tmp/pi-go.sock   # start RPC server

# Scan all skill files for hidden Unicode characters
./pi audit

# Scan with verbose output (include info-level findings)
./pi audit -v

# Output as JSON for CI pipelines
./pi audit --format json --output report.json

# Auto-remove dangerous characters (creates .bak backups)
./pi audit --strip

# Preview what would be removed
./pi audit --strip --dry-run

# Scan a specific file
./pi audit --file path/to/SKILL.md

Skills are automatically scanned on load — skills with critical findings (Unicode tags, BiDi overrides, variation selector attacks) are blocked from loading.

Pi looks for configuration in ~/.pi-go/config.json (global) and .pi-go/config.json (project-local):

• Model roles — Map role names to specific model strings
• Hooks — Shell commands triggered on tool events (e.g., post-write formatting)
• MCP servers — External tool servers via Model Context Protocol
• Themes — Terminal color schemes via theme config field

See LICENSE for details.