---
phase: 09-navigation-structure
plan: 01
subsystem: docs
tags: [mkdocs, navigation, docs, shadcn]

# Dependency graph
requires:
  - phase: 08-mkdocs-infrastructure
    provides: mkdocs.yml with shadcn theme, 13 flat nav pages, CI deploy workflow
provides:
  - Two-track MkDocs nav (User Guide + Developer Guide nested sections)
  - docs/guide/index.md landing page with 8-page table
  - docs/dev/index.md landing page with 2-page table
affects: [09-02-llms-files, 10-content-gaps, 11-agent-accessibility]

# Tech tracking
tech-stack:
  added: []
  patterns:
    - "MkDocs nested nav via config only — files stay in docs/ root, no directory moves"
    - "Section landing pages in docs/guide/ and docs/dev/ subdirs with ../ relative links"

key-files:
  created:
    - docs/guide/index.md
    - docs/dev/index.md
  modified:
    - mkdocs.yml

key-decisions:
  - "Pages stay in docs/ root — MkDocs nav nesting is config-driven, no URL changes"
  - "Section index pages placed in docs/guide/ and docs/dev/ subdirs, linked with ../ relative paths"
  - "guide/index.md and dev/index.md use no explicit label — MkDocs uses H1 as sidebar label"

patterns-established:
  - "Section landing pattern: H1 title + audience intro paragraph + In This Guide table with one-line descriptions"

requirements-completed: [UGDE-01]

# Metrics
duration: 1min
completed: 2026-03-20
---

# Phase 9 Plan 01: Navigation Structure Summary

**MkDocs nav restructured from 13-page flat list into User Guide (8 pages) + Developer Guide (2 pages) nested sections, with new section landing pages at docs/guide/index.md and docs/dev/index.md — mkdocs build --strict passes clean**

## Performance

- **Duration:** ~1 min
- **Started:** 2026-03-20T17:45:25Z
- **Completed:** 2026-03-20T17:46:30Z
- **Tasks:** 1
- **Files modified:** 3

## Accomplishments
- Replaced flat 13-page nav with two-track nested structure (User Guide / Developer Guide)
- Created docs/guide/index.md with audience intro and table of all 8 user-facing pages
- Created docs/dev/index.md with audience intro and table of both developer pages
- All 13 original docs pages remain in docs/ root — no URL changes

## Task Commits

Each task was committed atomically:

1. **Task 1: Restructure mkdocs.yml nav and create section landing pages** - `a8a1c1a` (docs)

**Plan metadata:** see final commit below

## Files Created/Modified
- `mkdocs.yml` - Nav section replaced: flat 13 pages -> nested User Guide + Developer Guide tracks
- `docs/guide/index.md` - User Guide landing: audience intro + table of 8 user-guide pages with one-line descriptions
- `docs/dev/index.md` - Developer Guide landing: audience intro + table of 2 developer pages with one-line descriptions

## Decisions Made
- Pages stay in docs/ root — MkDocs nav grouping is config-driven, not directory-driven (avoids URL breakage)
- Section index files placed in docs/guide/ and docs/dev/ subdirs with ../ relative links to docs/*.md targets
- No explicit sidebar labels for guide/index.md or dev/index.md — MkDocs derives them from the H1 headings

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered
- `mkdocs` command not found in PATH — installed via `pip3 install mkdocs mkdocs-shadcn mkdocs-redirects --break-system-packages` (same approach as Phase 08 CI). Build then passed clean with no warnings.

## User Setup Required
None - no external service configuration required.

## Next Phase Readiness
- Two-track nav is live — plan 09-02 can now create llms.txt and llms-full.txt using the same nav structure as reference
- No blockers or concerns

---
*Phase: 09-navigation-structure*
*Completed: 2026-03-20*
