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Set up project scaffold: Bun/OpenCode plugin with registry pattern

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- AGENTS.md adapted from taskgraph for this Bun/TypeScript plugin
- Dual MIT/Apache-2.0 licenses
- Package.json, tsconfig, biome config following open-memory pattern
- Skeleton src/ with registry-pattern tasks tool (help operation working)
- Opencode.json plugin config
- .gitignore for dist, node_modules, lockb
- Remove typo .gitingore files, proper .gitignore in .opencode/
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# AGENTS.md
## Project
`@alkdev/open-tasks` — an OpenCode plugin that gives agents structured task management with graph analysis, decomposition guidance, and workflow cost estimation. Exposes a single `tasks` tool using a registry pattern (like open-memory and open-coordinator) to keep the agent's visible tool count minimal.
Part of the alk.dev trio:
- **open-memory** (`memory` / `memory_compact`): session introspection, context awareness, history browsing
- **open-coordinator** (`worktree`): git worktree orchestration, session spawning, anomaly detection
- **open-tasks** (`tasks`): task graph management, dependency analysis, decomposition guidance
## Repository
- **Git**: `git@git.alk.dev:alkdev/open-tasks.git`
- **License**: MIT OR Apache-2.0
- **Runtime**: Bun
- **Language**: TypeScript (strict, ESM, verbatimModuleSyntax)
- **Linter**: Biome (`bun run lint`, `bun run format`)
- **Build**: `bun run build` → `dist/` (bun build + tsc declarations)
## Commands
```bash
bun run build # bun build src/index.ts + tsc --emitDeclarationOnly
bun run typecheck # tsc --noEmit
bun run lint # biome check .
bun run format # biome format --write .
bun run test # bun test
```
**Always run** `bun run typecheck` and `bun run lint` after changes.
## Architecture
### Core Dependency: @alkdev/taskgraph
The graph operations, risk scoring, frontmatter parsing, and analysis functions come from `@alkdev/taskgraph` — a pure TypeScript library built on graphology. This plugin wraps that library in an OpenCode tool interface.
Key imports from `@alkdev/taskgraph`:
- `TaskGraph` — primary graph data structure (construction, queries, mutation, export)
- `parseTaskFile`, `parseTaskDirectory`, `parseFrontmatter`, `serializeFrontmatter` — YAML frontmatter I/O
- `criticalPath`, `weightedCriticalPath`, `parallelGroups`, `bottlenecks` — analysis functions
- `riskPath`, `riskDistribution`, `calculateTaskEv`, `workflowCost` — risk & cost analysis
- `shouldDecomposeTask` — decomposition guidance
- Categorical types: `TaskScope`, `TaskRisk`, `TaskImpact`, `TaskLevel`, `TaskPriority`, `TaskStatus`
### Plugin Design: Registry Pattern
Like open-memory, this plugin exposes **one tool** (`tasks`) with internal operation dispatch. This keeps the agent's visible tool count low.
```
tasks({tool: "help"}) → Show available operations
tasks({tool: "list"}) → List tasks in project
tasks({tool: "show", args: {id: "..."}}) → Show task details
tasks({tool: "deps", args: {id: "..."}}) → Show task dependencies
tasks({tool: "validate"}) → Validate all task files
... etc
```
### Source Structure
```
src/
├── index.ts # Plugin entry: hooks + tool registration
├── tools.ts # Tool definitions (tasks router)
├── registry.ts # Operation registry pattern (dispatch by tool name)
├── operations/ # Individual operation implementations
│ ├── help.ts
│ ├── list.ts
│ ├── show.ts
│ ├── deps.ts
│ ├── validate.ts
│ └── ... (analysis operations)
└── formatting.ts # Output formatting helpers
```
### Plugin Hooks
| Hook | Purpose |
|------|---------|
| None initial — future: task status injection into system prompt, worktree-aware task context |
### The `tasks` Tool
Single tool with `{tool, args}` dispatch. The `help` operation provides full reference with examples, following the pattern from open-memory's `memory({tool: "help"})`.
Operations map to `@alkdev/taskgraph` functions, reading tasks from the project's `tasks/` directory and returning formatted output.
## Local Development & Testing
OpenCode installs plugins from npm into `~/.cache/opencode/node_modules/`. When doing local development, symlink your local repo:
### Setup (one-time)
```bash
rm -rf ~/.cache/opencode/node_modules/@alkdev/open-tasks
ln -s /workspace/@alkdev/open-tasks ~/.cache/opencode/node_modules/@alkdev/open-tasks
```
### Iteration loop
```bash
bun run build # rebuild dist/index.js
bun run typecheck # verify types
bun run lint # verify style
bun run test # run tests
```
After rebuilding, restart OpenCode to pick up the new build.
### Also clear Bun's global cache
```bash
rm -rf ~/.bun/install/cache/@alkdev/open-tasks*
```
## Key Conventions
- No comments unless requested
- ESM with `.js` extension in imports
- Strict TypeScript with `verbatimModuleSyntax`
- Biome for linting and formatting
- Task files are the source of truth (markdown with YAML frontmatter)
- Single tool with registry dispatch — minimize agent context bloat
- Include a `help` operation for discoverability
## Relationship to Other Plugins
- **open-memory** (`memory`, `memory_compact`): session history, context awareness — complementary
- **open-coordinator** (`worktree`): worktree orchestration — tasks drive what worktrees implement
- **taskgraph CLI** (`taskgraph`): Rust CLI for the same operations — this plugin is the TypeScript/OpenCode equivalent
- **@alkdev/taskgraph** (npm): Core library this plugin wraps — all graph operations come from here
## Task File Format
Tasks are markdown files in `tasks/` with YAML frontmatter:
```yaml
---
id: auth-setup
name: Setup Authentication
status: pending
depends_on: []
scope: moderate
risk: medium
impact: component
level: implementation
---
## Description
Implement OAuth2 authentication with provider abstraction.
## Acceptance Criteria
- [ ] OAuth2 flow works with Google provider
- [ ] Tokens stored securely
## Notes
> Agent fills this during implementation.
## Summary
> Agent fills this on completion.
```
## Build & Test Commands
```bash
bun run build # bun build src/index.ts + tsc declarations
bun run typecheck # tsc --noEmit
bun run lint # biome check .
bun run format # biome format --write .
bun run test # bun test
```
## License
Dual-licensed under MIT OR Apache-2.0. Both license files must be present at repository root.

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}
}

4
opencode.json Normal file
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{
"plugin": ["@alkdev/open-tasks"],
"$schema": "https://opencode.ai/config.json"
}

52
package.json Normal file
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{
"name": "@alkdev/open-tasks",
"version": "0.1.0",
"description": "OpenCode plugin for structured task management with graph analysis, decomposition guidance, and workflow cost estimation.",
"type": "module",
"main": "dist/index.js",
"types": "dist/index.d.ts",
"exports": {
".": {
"types": "./dist/index.d.ts",
"import": "./dist/index.js"
}
},
"scripts": {
"build": "bun build src/index.ts --outdir dist --target bun --format esm && tsc --emitDeclarationOnly",
"lint": "bunx @biomejs/biome check .",
"format": "bunx @biomejs/biome format --write .",
"typecheck": "tsc --noEmit",
"test": "bun test"
},
"author": "Alkimia Development",
"license": "(MIT OR Apache-2.0)",
"repository": {
"type": "git",
"url": "git@git.alk.dev:alkdev/open-tasks.git"
},
"files": [
"dist",
"LICENSE-MIT",
"LICENSE-APACHE"
],
"publishConfig": {
"access": "public"
},
"keywords": [
"opencode",
"plugin",
"tasks",
"taskgraph",
"dependency-analysis",
"decomposition"
],
"dependencies": {
"@alkdev/taskgraph": "^0.0.1",
"@opencode-ai/plugin": "^1.1.3"
},
"devDependencies": {
"@types/bun": "^1.2.0",
"@types/node": "^20.14.0",
"typescript": "^5.7.3"
}
}

10
src/index.ts Normal file
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import type { Plugin } from "@opencode-ai/plugin";
import { createTools } from "./tools.js";
const OpenTasksPlugin: Plugin = async (ctx) => {
return {
tool: createTools(ctx),
};
};
export default OpenTasksPlugin;

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src/tools.ts Normal file
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import type { PluginInput, ToolDefinition } from "@opencode-ai/plugin";
import { tool } from "@opencode-ai/plugin";
const z = tool.schema;
const HELP_TEXT = `# Tasks Tool
Call \`tasks({tool: "<name>", args: {...}})\` to use one.
| Tool | Description | Key args |
|------|-------------|----------|
| list | List tasks in the project | status, scope |
| show | Show task details | id |
| deps | Show task dependencies (prerequisites) | id |
| dependents | Show tasks that depend on a task | id |
| validate | Validate all task files | — |
| critical | Show critical path | — |
| parallel | Show parallel execution groups | — |
| bottleneck | Show bottleneck analysis | — |
| risk | Show risk path and distribution | — |
| cost | Show workflow cost estimate | — |
| decompose | Check if a task should be decomposed | id |
| help | Show this reference, or details for a specific tool | tool |
Examples:
- \`tasks({tool: "list"})\`
- \`tasks({tool: "show", args: {id: "auth-setup"}})\`
- \`tasks({tool: "deps", args: {id: "auth-setup"}})\`
- \`tasks({tool: "critical"})\`
- \`tasks({tool: "help", args: {tool: "show"}})\``;
type ToolArgs = Record<string, unknown>;
type TaskHandler = (args: ToolArgs, ctx: PluginInput) => string | Promise<string>;
const handlers: Record<string, TaskHandler> = {
help(args) {
if (args.tool && typeof args.tool === "string") {
return `Details for "${args.tool}" — coming soon. Full implementation pending.`;
}
return HELP_TEXT;
},
list() {
return "Task listing — implementation pending. Tasks are read from the project's tasks/ directory.";
},
show(args) {
const id = (args.id as string) ?? "unknown";
return `Task details for "${id}" — implementation pending.`;
},
deps(args) {
const id = (args.id as string) ?? "unknown";
return `Dependencies for "${id}" — implementation pending.`;
},
dependents(args) {
const id = (args.id as string) ?? "unknown";
return `Dependents of "${id}" — implementation pending.`;
},
validate() {
return "Task validation — implementation pending.";
},
critical() {
return "Critical path analysis — implementation pending.";
},
parallel() {
return "Parallel execution groups — implementation pending.";
},
bottleneck() {
return "Bottleneck analysis — implementation pending.";
},
risk() {
return "Risk path analysis — implementation pending.";
},
cost() {
return "Workflow cost estimate — implementation pending.";
},
decompose(args) {
const id = (args.id as string) ?? "unknown";
return `Decomposition check for "${id}" — implementation pending.`;
},
};
export function createTools(ctx: PluginInput): Record<string, ToolDefinition> {
return {
tasks: tool({
description:
'Task graph management: list, show, analyze dependencies, critical path, risk, and workflow cost. Call tasks({tool: "help"}) for full reference.',
args: {
tool: z
.string()
.describe(
"Operation name: help, list, show, deps, dependents, validate, critical, parallel, bottleneck, risk, cost, decompose.",
),
args: z
.record(z.string(), z.unknown())
.optional()
.describe('Arguments for the operation. Call {tool: "help"} for details.'),
},
async execute(input, _context) {
const toolName = input.tool;
const toolArgs = (input.args as ToolArgs) ?? {};
const handler = handlers[toolName];
if (!handler) {
return `Unknown operation: "${toolName}". Call tasks({tool: "help"}) for available operations.`;
}
try {
return await handler(toolArgs, ctx);
} catch (err) {
return `Error in ${toolName}: ${err instanceof Error ? err.message : String(err)}`;
}
},
}),
};
}

18
tsconfig.json Normal file
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{
"compilerOptions": {
"target": "ES2022",
"module": "ES2022",
"moduleResolution": "Bundler",
"types": ["node", "bun"],
"strict": true,
"noEmitOnError": true,
"declaration": true,
"emitDeclarationOnly": true,
"outDir": "dist",
"rootDir": "src",
"verbatimModuleSyntax": true,
"skipLibCheck": true,
"forceConsistentCasingInFileNames": true
},
"include": ["src"]
}