| Sketch is an agentic coding tool with a two-layer architecture: |
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| 1. Outer sketch: CLI command running on user's machine |
| 2. Inner sketch: Binary running inside Docker containers for isolated work |
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| 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. |
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| ## Core Packages |
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| - 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 |
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| ## Development Guidelines |
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| - 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 |
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| ## Meta |
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| 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. |