> ## Documentation Index
> Fetch the complete documentation index at: https://agent-harness101.com/llms.txt
> Use this file to discover all available pages before exploring further.

# The architecture

> Each component exists because the simpler design failed.

## The question

What architecture did those failures force us to build?

## The answer

Each component exists because the simpler design failed.

```mermaid theme={null}
flowchart TD
User --> Loop["Agent loop + context + task state"]
Loop --> LLM
LLM --> Auth["Authorization / sandbox / secrets"]
Auth --> Executor["Tool executor"]
Executor --> Files
Executor --> Shell
Executor --> MCP
Executor --> External
```

Read/search · Edit/shell · Summaries · Dynamic plans · Selective subagents


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