v0.1.0 — The agent loop is the product

🎉 First Release

yoagent is a simple, effective agent loop with tool execution and event streaming in Rust. Inspired by pi-agent-core.

Features

Agent Loop

• Stateful agent with steering (interrupt mid-run) and follow-up queues
• Full event stream: AgentStart → TurnStart → MessageUpdate (deltas) → ToolExecution → TurnEnd → AgentEnd
• Parallel tool execution by default — sequential and batched strategies available
• Streaming tool output via on_update callback
• Automatic retry with exponential backoff and jitter

Multi-Provider

• 7 API protocols, 20+ providers through a modular registry
• Anthropic, OpenAI, Google Gemini, Azure, Bedrock, Vertex, and OpenAI-compatible providers

Built-in Tools

• bash — shell execution with timeout, deny patterns, confirmation callbacks
• read_file / write_file — file I/O with line numbers and path restrictions
• edit_file — surgical search/replace with fuzzy match hints
• list_files — directory exploration
• search — pattern search via ripgrep/grep

Context Management

• Token estimation and smart truncation
• Execution limits (max turns, max tokens, timeout)
• Prompt caching (Anthropic)

MCP Support

• stdio and HTTP transports
• McpToolAdapter wraps MCP tools as AgentTool

Quick Start

[dependencies]
yoagent = "0.1"
tokio = { version = "1", features = ["full"] }

CLI Example

A ~200-line interactive coding agent:

ANTHROPIC_API_KEY=sk-... cargo run --example cli

Stats

• 77 tests (+ 3 integration)
• Zero clippy warnings
• Full documentation

---

Docs · DeepWiki · crates.io