Sketch is an agentic coding tool with a two-layer architecture:

1. Outer sketch: CLI command running on user's machine
2. Inner sketch: Binary running inside Docker containers for isolated work

Both layers use the same entrypoint (cmd/sketch). Outer sketch sets up containerization and starts inner sketch. Changes made in inner sketch are pushed via git to outer sketch.

Core Packages

• termui, webui: Both interfaces operate at all times
• loop: Central state machine that manages agent conversation flow
• claudetools: Tool calls available to LLMs
• llm: Common LLM interface and conversation management, with provider-specific integrations

Development Guidelines

• Do NOT git add or modify .gitignore, makefiles, or executable binaries unless requested
• When changing tool schemas, update both termui and webui
• For unsafe/recursive development, use -unsafe flag
• Unless explicitly requested, do not add backwards compatibility shims

Meta

The program you are working on is Sketch. The program you are running is Sketch. This can be slightly confusing: Carefully distinguish the prompt and tools you have from the codebase you are working on. Modifying the code does not change your prompt or tools.