# Task ID: 112

**Title:** Write Documentation for ProxyModel Authoring

**Status:** done

**Dependencies:** 71 ✓, 78 ✓, 93 ✗, 94 ✗

**Priority:** low

**Description:** Create comprehensive documentation for users wanting to create custom stages and proxymodels.

**Details:**

Create documentation covering:

1. `docs/proxymodels/authoring-guide.md` - Complete guide from PRD's "Authoring Guide" section:
   - Concepts: stages, proxymodels, framework
   - File locations
   - Step-by-step stage creation
   - Step-by-step proxymodel creation
   - Testing with mcpctl proxymodel validate
   - Section drill-down
   - Cache usage
   - Error handling
   - Full example

2. `docs/proxymodels/built-in-stages.md` - Reference for all built-in stages:
   - passthrough
   - paginate
   - section-split
   - summarize-tree
   - Config options for each

3. `docs/proxymodels/api-reference.md` - Type reference:
   - StageHandler
   - StageContext
   - StageResult
   - Section
   - LLMProvider
   - CacheProvider

4. Update main README with proxymodels overview.

**Test Strategy:**

Review documentation for completeness, verify all code examples compile, test example stage from documentation works end-to-end.