## Memory Tools (via @alkdev/open-memory plugin)

You have access to two tools for managing your context and accessing session history:

### memory({tool: "...", args: {...}})

Read-only tool for introspecting your session history and context state. Available operations:
- `memory({tool: "help"})` — full reference with examples
- `memory({tool: "summary"})` — quick counts of projects, sessions, messages, todos
- `memory({tool: "sessions"})` — list recent sessions (useful for finding past work)
- `memory({tool: "children", args: {sessionId: "ses_..."}})` — list sub-agent sessions spawned from a parent
- `memory({tool: "messages", args: {sessionId: "..."}})` — read a session's conversation
- `memory({tool: "messages", args: {sessionId: "...", role: "assistant"}})` — read only assistant messages
- `memory({tool: "messages", args: {sessionId: "...", showTools: true}})` — include tool-call output
- `memory({tool: "message", args: {messageId: "msg_..."}})` — read a single message by ID
- `memory({tool: "search", args: {query: "..."}})` — search across all conversations
- `memory({tool: "compactions", args: {sessionId: "..."}})` — view compaction checkpoints
- `memory({tool: "context"})` — check your current context window usage

### memory_compact()

Trigger compaction on the current session. This summarizes the conversation so far to free context space.

**When to use memory_compact:**
- When context is above 80% (check with `memory({tool: "context"})`)
- When you notice you're losing track of earlier conversation details
- At natural breakpoints in multi-step tasks (after completing a subtask, before starting a new one)
- When the system prompt shows a yellow/red/critical context warning
- Proactively, rather than waiting for automatic compaction at 92%

**When NOT to use memory_compact:**
- When context is below 50% (it wastes a compaction cycle)
- In the middle of a complex edit that you need immediate context for
- When the task is nearly complete (just finish the task instead)

Compaction preserves your most important context in a structured summary — you will continue the session with the summary as your starting point.

## Worktree Tool (via @alkimiadev/open-coordinator plugin)

You have access to the `worktree` tool for git worktree management and session coordination. Call with `{action, args}`:

### Coordinator Operations (available when session is not spawned by another session)

- `worktree({action: "list"})` — List git worktrees
- `worktree({action: "dashboard"})` — Worktree dashboard with session info
- `worktree({action: "spawn", args: {tasks: [...], prompt: "..."}})` — Spawn parallel worktrees + sessions
- `worktree({action: "sessions"})` — Query spawned session status
- `worktree({action: "message", args: {sessionID: "...", message: "..."}})` — Message a session
- `worktree({action: "abort", args: {sessionID: "..."}})` — Abort a session
- `worktree({action: "cleanup", args: {action: "remove", pathOrBranch: "..."}})` — Remove worktree
- `worktree({action: "help"})` — Show all available operations

### Implementation Operations (available when session is spawned by a coordinator)

- `worktree({action: "current"})` — Show your worktree mapping
- `worktree({action: "notify", args: {message: "...", level: "info|blocking"}})` — Report to coordinator
- `worktree({action: "status"})` — Show worktree git status

The plugin auto-injects `workdir` for bash commands when the session is mapped to a worktree.

## Project: @alkdev/taskgraph

Pure TypeScript library for DAG task graph analysis, risk scoring, cost-benefit math, and YAML frontmatter parsing. Built on graphology. Dual-licensed MIT / Apache-2.0.

### Commands

- `npm run build` — Build with tsup (ESM + CJS + declarations)
- `npm run lint` — Type-check with `tsc --noEmit`
- `npm test` — Run tests with vitest
- `npm run test:watch` — Watch mode
- `npm run test:coverage` — Coverage report (v8)

### Architecture

See `docs/architecture/` for the full SDD. Key points:

- **Public API boundary**: `src/index.ts` is the sole entry point. Internal graphology details are not re-exported. Only add exports to `index.ts` — never import from internal paths.
- **Edge convention**: prerequisite → dependent (if B depends on A, edge is A → B).
- **Edge keys**: deterministic `${source}->${target}` per ADR-006.
- **Schemas**: TypeBox via `@alkdev/typebox`. All runtime schemas and types are defined in `src/schema/`. No Zod.
- **Validation**: throws on construction errors (duplicates, missing nodes). `validate*()` methods return error arrays instead of throwing.
- **No comments in source**: Do not add comments to code unless explicitly asked.

### Source Layout

```
src/
  index.ts          — Public API surface (all exports)
  graph/
    construction.ts — TaskGraph class
    queries.ts      — Internal query helpers
    mutation.ts     — Internal mutation helpers
    validation.ts   — Internal validation helpers
  analysis/
    critical-path.ts, bottleneck.ts, parallel-groups.ts
    risk.ts, cost-benefit.ts, decompose.ts, defaults.ts
  frontmatter/
    parse.ts, serialize.ts, file-io.ts (Node.js only)
  schema/
    enums.ts, task.ts, graph.ts, results.ts
  error/
    index.ts        — Error classes + validation types
```

### Dependencies

Runtime: `graphology`, `graphology-*`, `yaml`, `@alkdev/typebox`. No native addons.
Dev: `tsup`, `typescript`, `vitest`, `@vitest/coverage-v8`.