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: state machine that manages agent conversation flow

Development Guidelines

• Do NOT git add or modify .gitignore, makefiles, or executable binaries unless requested
• When adding, removing, or changing tools, update both termui and webui
• Unless explicitly requested, do not add backwards compatibility shims. Just change all the relevant code.

Building

You can build the sketch binary with "make". The webui directory has some standalone "npm run dev" capability, but the main build is "make".

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.

To start a copy of sketch, if you don't have an ANTHROPIC_API_KEY in your env already, you can use:

ANTHROPIC_API_KEY=fake sketch -skaband-addr= -addr ":8080" -unsafe

To browse the copy of sketch you just started, browse to localhost:8080.

Testing

• Do NOT use the testify package. Write tests using the standard Go testing library only.