Geektutu
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Book

Build GeekAgent from Scratch in 7 Days

Build the simplest possible Agent/Harness from scratch in TypeScript over 7 days, staying minimally viable and additive-only. The road runs from a REPL chat foundation through tool calling, file read/write, history compression, multi-session persistence, permissions and rollback, knowledge retrieval, and on to MCP and plugin extensions.

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Contents

16 chapters
  1. Foundations - Tools and Sessions
    1. Build GeekAgent from Scratch — Day 1 REPL Foundation
    2. Build GeekAgent from Scratch — Day 2 Tool Calling Loop
    3. Build GeekAgent from Scratch — Day 3 Bash Tool
    4. Build GeekAgent from Scratch — Day 4 File Tools and Registry
    5. Build GeekAgent from Scratch — Day 5 History Compaction
    6. Build GeekAgent from Scratch — Day 6 Multiple Sessions and Persistence
    7. Build GeekAgent from Scratch — Day 7 Lightweight TUI and Usage Panel
  2. Intermediate - Safety and Memory
    1. Build GeekAgent from Scratch — Day 8 Permissions and Rollback
    2. Build GeekAgent from Scratch — Day 9 Task Planning and Subagents
    3. Build GeekAgent from Scratch — Day 10 Project Instructions and Long-term Memory
    4. Build GeekAgent from Scratch — Day 11 Skills
    5. Build GeekAgent from Scratch — Day 12 Code Search and Web Fetching
    6. Build GeekAgent from Scratch — Day 13 Proactive Memory
    7. Build GeekAgent from Scratch — Day 14 Lightweight RAG Knowledge Base
  3. Extensions - Tool Connectivity
    1. Build GeekAgent from Scratch — Day 15 MCP Tool Integration
    2. Build GeekAgent from Scratch — Day 16 Plugin Framework