# Example Session Entry

This is a reference example showing the right granularity and writing
style for session notes. Each change is its own entry with specific
detail about what, why, how, and what files were touched.

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## Session — 2026-04-27

### Trello REST Client
Wraps the Trello board API with httpx. Fetches lists and cards, groups
cards by label name (which is the project slug). Includes in-memory cache
with configurable TTL so the dashboard doesn't hit Trello on every page
load.

- **What:** `TrelloClient` class with card grouping and TTL cache
- **Why:** Dashboard needs live Trello card state joined to vault data
- **How:** httpx.Client with 15s timeout. `_fetch_all()` populates cache
  dict with lists and cards. `get_cards_by_project()` groups cards by
  label name. `get_list_for_project()` returns highest-priority list
  name using a priority map (Active=0, On Deck=1, etc). `refresh()`
  invalidates cache.
- **Touches:** data/trello.py (new)

### Loose Thread Scanner
Scans all vault .md files for unchecked `- [ ]` checkbox items. Returns
them as LooseThread objects with the text, project slug, and source file.
Found 862 items across the real vault.

- **What:** `find_loose_threads()` returns list of LooseThread
- **Why:** "What loose threads have I left" — unfiled commitments
- **How:** Regex `^(\s*)-\s+\[\s\]\s+(.+)$` with MULTILINE flag. Scans
  all .md files regardless of type. Uses project slug from frontmatter
  if available, falls back to filename stem.
- **Touches:** data/sessions.py

### Path Traversal Fix
Gemini CLI review caught that _log_session accepted arbitrary slugs that
could write outside the vault directory via `../../` paths. Added slug
validation regex and resolved-path containment check.

- **What:** Slug validation + path containment for MCP write tools
- **Why:** Security — prevent path traversal via malicious slug input
- **How:** _SLUG_RE regex `^[a-z][a-z0-9-]*$` rejects anything with dots,
  slashes, or uppercase. _validate_slug() returns error message or None.
  Additional check: `filepath.resolve().is_relative_to(vault_path.resolve())`.
  Applied to both _log_session and _update_project_status.
- **Touches:** mcp/server.py

### Pydantic Settings
App configuration using pydantic-settings with LOOM_ env prefix. Covers
host, port, vault path, Trello credentials, and cache TTL. Reads from
.env file.

- **What:** `Settings` class with LOOM_ prefix and vault_dir property
- **Why:** Centralized config with env-file support
- **How:** pydantic-settings BaseSettings with env_prefix="LOOM_". vault_dir
  is a @property that returns Path(vault_path).
- **Touches:** core/config.py