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AGENTS.md
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@@ -56,4 +56,53 @@ You have access to the `worktree` tool for git worktree management and session c
- `worktree({action: "notify", args: {message: "...", level: "info|blocking"}})` — Report to coordinator - `worktree({action: "notify", args: {message: "...", level: "info|blocking"}})` — Report to coordinator
- `worktree({action: "status"})` — Show worktree git status - `worktree({action: "status"})` — Show worktree git status
The plugin auto-injects `workdir` for bash commands when the session is mapped to a worktree. 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`.

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# @alkdev/taskgraph
Directed acyclic graph analysis, risk scoring, and YAML frontmatter parsing for task management.
Built on [graphology](https://github.com/graphology/graphology) — pure TypeScript, no native addons, works in Node.js / Deno / Bun.
## Install
```sh
npm install @alkdev/taskgraph
```
## Quick Start
```ts
import { TaskGraph, parallelGroups, criticalPath } from '@alkdev/taskgraph';
const graph = TaskGraph.fromTasks([
{ id: 'design', name: 'Design API', dependsOn: [], risk: 'low', scope: 'narrow' },
{ id: 'impl', name: 'Implement', dependsOn: ['design'], risk: 'medium', scope: 'moderate' },
{ id: 'test', name: 'Write tests', dependsOn: ['impl'], risk: 'low', scope: 'narrow' },
{ id: 'docs', name: 'Write docs', dependsOn: ['design'], risk: 'trivial', scope: 'narrow' },
]);
const groups = parallelGroups(graph);
// [['design'], ['impl', 'docs'], ['test']]
const path = criticalPath(graph);
// ['design', 'impl', 'test']
```
## TaskGraph
The primary data structure. Wraps a graphology `DirectedGraph` with validation and typed access.
### Construction
```ts
// From task inputs (convenience — edges created from dependsOn)
const g1 = TaskGraph.fromTasks([...tasks]);
// From explicit tasks + edges (per-edge qualityRetention)
const g2 = TaskGraph.fromRecords([...tasks], [...edges]);
// From serialized data (round-trip with export())
const data = g1.export();
const g3 = TaskGraph.fromJSON(data);
// Incremental building
const g4 = new TaskGraph();
g4.addTask('a', { name: 'Task A' });
g4.addTask('b', { name: 'Task B' });
g4.addDependency('a', 'b'); // a → b (a is prerequisite)
```
### Queries
```ts
graph.topologicalOrder(); // string[] — prerequisite → dependent order
graph.dependencies('impl'); // ['design'] — prerequisites of impl
graph.dependents('design'); // ['impl', 'docs'] — dependents of design
graph.hasCycles(); // boolean
graph.findCycles(); // string[][] — cycle paths
graph.taskCount(); // number
graph.getTask('design'); // TaskGraphNodeAttributes | undefined
```
### Validation
```ts
graph.validate(); // AnyValidationError[] — combined schema + graph
graph.validateSchema(); // ValidationError[] — per-field TypeBox validation
graph.validateGraph(); // GraphValidationError[] — cycles, dangling refs
```
### Mutation
```ts
graph.removeTask('id');
graph.removeDependency('prereq', 'dependent');
graph.updateTask('id', { risk: 'high' });
graph.updateEdgeAttributes('prereq', 'dependent', { qualityRetention: 0.8 });
```
### Export
```ts
const data = graph.export(); // TaskGraphSerialized (graphology JSON)
const json = JSON.stringify(graph); // uses toJSON() alias
```
## Analysis Functions
All analysis functions take a `TaskGraph` instance as their first argument.
### Critical Path
```ts
import { criticalPath, weightedCriticalPath } from '@alkdev/taskgraph';
criticalPath(graph); // longest path by edge count
weightedCriticalPath(graph, (id, attrs) => {
// custom weight per node
return riskWeight(attrs.risk ?? 'medium') * impactWeight(attrs.impact ?? 'isolated');
});
```
### Parallel Groups
```ts
import { parallelGroups } from '@alkdev/taskgraph';
parallelGroups(graph); // string[][] — tasks at each topological depth
```
### Bottleneck Analysis
```ts
import { bottlenecks } from '@alkdev/taskgraph';
const scores = bottlenecks(graph);
// [{ taskId: 'design', score: 0.83 }, ...] — sorted descending
```
### Risk Analysis
```ts
import { riskPath, riskDistribution } from '@alkdev/taskgraph';
riskPath(graph);
// { path: ['design', 'impl', 'test'], totalRisk: 4.2 }
riskDistribution(graph);
// { trivial: [...], low: [...], medium: [...], high: [...], critical: [...], unspecified: [...] }
```
### Expected Value & Workflow Cost
```ts
import { calculateTaskEv, workflowCost } from '@alkdev/taskgraph';
calculateTaskEv(0.8, 3.0, 1.5);
// { ev: 4.2, pSuccess: 0.8, expectedRetries: 0.25 }
const result = workflowCost(graph, {
propagationMode: 'dag-propagate', // or 'independent'
defaultQualityRetention: 0.9,
includeCompleted: false,
});
// result.tasks — per-task EV entries
// result.totalEv — aggregate
// result.averageEv
```
### Decomposition
```ts
import { shouldDecomposeTask } from '@alkdev/taskgraph';
shouldDecomposeTask({ name: 'Refactor', risk: 'high', scope: 'broad' });
// { shouldDecompose: true, reasons: ['risk: high — ...', 'scope: broad — ...'] }
```
### Categorical Numeric Methods
```ts
import {
scopeCostEstimate, scopeTokenEstimate,
riskSuccessProbability, riskWeight,
impactWeight, resolveDefaults,
} from '@alkdev/taskgraph';
scopeCostEstimate('moderate'); // 3.0
scopeTokenEstimate('broad'); // 6000
riskSuccessProbability('high'); // 0.65
riskWeight('high'); // 0.35
impactWeight('project'); // 3.0
resolveDefaults({ name: 'Task', risk: 'high' });
// { scope: 'narrow', risk: 'high', ..., costEstimate: 2.0, ... }
```
## Frontmatter
Parse and serialize YAML frontmatter in markdown files.
```ts
import {
parseFrontmatter, serializeFrontmatter,
parseTaskFile, parseTaskDirectory,
} from '@alkdev/taskgraph';
// Parse a markdown string with --- frontmatter
const task = parseFrontmatter(`---
id: my-task
name: My Task
dependsOn: []
risk: medium
---
Task body here`);
// Serialize back to markdown
const md = serializeFrontmatter(task, 'Task body here');
// File I/O (Node.js only)
const task2 = await parseTaskFile('/path/to/task.md');
const tasks = await parseTaskDirectory('/path/to/tasks/');
```
## Schemas & Types
All schemas are TypeBox schemas and all types are inferred from them.
```ts
import type {
TaskInput, DependencyEdge,
TaskGraphNodeAttributes, TaskGraphEdgeAttributes, TaskGraphSerialized,
RiskPathResult, DecomposeResult, WorkflowCostOptions, WorkflowCostResult,
EvConfig, EvResult, RiskDistributionResult, ResolvedTaskAttributes,
} from '@alkdev/taskgraph';
import type {
TaskScope, TaskRisk, TaskImpact, TaskLevel, TaskPriority, TaskStatus,
} from '@alkdev/taskgraph';
```
### Enums
```ts
// Type values (also usable as TypeScript types)
type Scope = 'single' | 'narrow' | 'moderate' | 'broad' | 'system';
type Risk = 'trivial' | 'low' | 'medium' | 'high' | 'critical';
type Impact = 'isolated' | 'component' | 'phase' | 'project';
type Level = 'planning' | 'decomposition' | 'implementation' | 'review' | 'research';
type Priority = 'low' | 'medium' | 'high' | 'critical';
type Status = 'pending' | 'in-progress' | 'completed' | 'failed' | 'blocked';
```
## Error Classes
```ts
import {
TaskgraphError, // base class
TaskNotFoundError, // .taskId
CircularDependencyError, // .cycles: string[][]
InvalidInputError, // .field, .message
DuplicateNodeError, // .taskId
DuplicateEdgeError, // .prerequisite, .dependent
} from '@alkdev/taskgraph';
```
## License
Licensed under either of [Apache License, Version 2.0](LICENSE-APACHE) or [MIT License](LICENSE-MIT) at your option.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

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"risk-analysis", "risk-analysis",
"graphology" "graphology"
], ],
"license": "MIT", "license": "MIT OR Apache-2.0",
"dependencies": { "dependencies": {
"@alkdev/typebox": "^0.34.49", "@alkdev/typebox": "^0.34.49",
"graphology": "^0.26.0", "graphology": "^0.26.0",