# IdeA Plugin SDK

Minimal public TypeScript SDK for IdeA plugins.

This first version intentionally stays small:

- public manifest types for `idea-plugin.json`;
- public runtime types for plugin modules exposing `activate(ctx)`;
- plugin-owned persistent storage through `ctx.storage`;
- a stable `ctx.services` facade for workspace, background task and terminal operations;
- public workspace file APIs for reading, writing, listing, stat and path resolution;
- a bounded generic project-structure query API;
- public command-task APIs for launching and tracking generic tools;
- public external-toolchain diagnostics for executables, env vars and files;
- public best-effort event subscriptions and workspace watch;
- public structured config-document helpers for JSON documents;
- a lightweight manifest validator;
- a minimal `examples/hello-plugin` plugin.

## Install

```sh
npm install
```

## Build

```sh
npm run build
```

## Typecheck the example

```sh
npm run typecheck:examples
```

## Build the installable hello plugin archive

```sh
npm run package:hello-plugin
```

The archive is written to:

```text
examples/hello-plugin/build/hello-plugin-0.1.0.zip
```

Its ZIP root contains `idea-plugin.json` directly, with no wrapping parent directory. The
compiled ESM entrypoint is emitted at `dist/index.js`, matching the manifest `main` field,
alongside the other compiled files imported by that entrypoint.

## Plugin shape

An IdeA plugin ships an `idea-plugin.json` manifest and a JavaScript entrypoint built from
TypeScript.

```json
{
  "ideaPluginManifestVersion": 1,
  "id": "com.example.hello",
  "displayName": "Hello Plugin",
  "version": "0.1.0",
  "main": "dist/index.js",
  "trustLevel": "full",
  "activationScope": "app",
  "contributes": {}
}
```

`activationScope` is optional and defaults to `"app"`, which activates the
plugin at app bootstrap without requiring a focused project. Use
`"activationScope": "project"` only when `activate(ctx)` needs project-scoped
services immediately; IdeA will keep that plugin pending until a project is
focused, then activate it once for the app session.

The `main` field is the ESM entrypoint loaded by IdeA. It may import other
JavaScript files from the same plugin package with relative specifiers:

```js
import { COMMAND_ID } from "./constants.js";
import { useWorkspaceSdk } from "./core/workspace.js";
```

Those relative imports are served by IdeA through the `idea-plugin://` protocol,
so plugins do not need to be bundled into a single JavaScript file. A plain
`tsc` build that emits multiple ESM files under `dist/` is supported, as shown
by `examples/hello-plugin`.

Only package-relative imports are resolved this way. Bare specifiers such as
`react`, `lodash` or any dependency expected from `node_modules` are not
resolved by the host at runtime. Third-party dependencies must be bundled into
the plugin output or vendored as relative files shipped inside the plugin
package.

The entrypoint exports an `activate(ctx)` function:

```ts
import type { ActivateContext } from "@idea/plugin-sdk";

export function activate(ctx: ActivateContext): void {
  ctx.logger.info("hello from plugin");
}
```

## Layout Runtime

Plugins can contribute custom layout panels by declaring `contributes.layouts`
in `idea-plugin.json` and registering the matching layout type during
`activate(ctx)`.

```json
{
  "contributes": {
    "layouts": [
      {
        "type": "com.example.status",
        "label": "Status",
        "component": "StatusPanel"
      }
    ]
  }
}
```

```ts
import type { ActivateContext, PluginLayoutProps } from "@idea/plugin-sdk";

function StatusPanel(props: PluginLayoutProps): string {
  return `status for ${props.projectId}`;
}

export function activate(ctx: ActivateContext): void {
  const disposable = ctx.layouts?.register({
    type: "com.example.status",
    component: StatusPanel
  });
  if (disposable) ctx.subscriptions.push(disposable);
}
```

Public layout props are:

- `projectId`: project hosting the layout cell;
- `nodeId`: stable layout node id for that cell instance;
- `layoutType`: contributed layout type from the manifest;
- `state`: opaque JSON-serializable state persisted by the host;
- `setState(next)`: replaces that state;
- `availability`: currently `"available"` when the component is mounted.

Lifecycle: register layouts during `activate(ctx)`, keep the returned disposable
in `ctx.subscriptions`, and let the host dispose it on plugin unload. Layout
components may be mounted, unmounted and remounted by the host; keep durable UI
state in `state` via `setState`, not in module globals. Call `setState` from
user actions, effects or asynchronous callbacks, not unconditionally while
rendering. Services are available from `ctx.services` to plugins declaring the
`tooling` capability; layout props do not expose private runtime gateways.

## Plugin-Owned Storage

Use `ctx.storage` for state owned by the plugin itself: internal counters, flags,
preferences, small caches and host-facing settings. This is the canonical place
for plugin-owned state because the host can scope and persist it outside the
user's project files.

```ts
import type { ActivateContext } from "@idea/plugin-sdk";

const ACTIVATION_COUNT_KEY = "helloPlugin.activationCount";

export async function activate(ctx: ActivateContext): Promise<void> {
  const current = await ctx.storage?.get<number>(ACTIVATION_COUNT_KEY);
  const next = typeof current === "number" ? current + 1 : 1;
  await ctx.storage?.set(ACTIVATION_COUNT_KEY, next);

  ctx.logger.info("activation count", { next });
}
```

Do not write plugin-internal state into `.ideai/*` or other project files by
default. Use workspace files and config-document helpers only when the file is
project-owned content or project-owned configuration that the user expects to
see, review and version with the project.

## Runtime Services

Plugins declaring the `tooling` capability receive `ctx.services`. Plugins
without that capability do not receive this facade. Prefer `ctx.services` over
IdeA's internal runtime objects when it is available:

```ts
import type { ActivateContext } from "@idea/plugin-sdk";

export async function activate(ctx: ActivateContext): Promise<void> {
  const project = await ctx.services?.workspace.getCurrentProject();
  ctx.logger.info("current project", project);

  const task = await ctx.services?.tasks.getStatus("task-id");
  ctx.logger.info("task status", task?.status);

  const terminal = await ctx.services?.terminal.open({ rows: 24, cols: 80 });
  await terminal?.write(new TextEncoder().encode("echo hello\\r"));
}
```

### Workspace Files

Workspace paths are always relative to the project root. Hosts reject absolute
paths, `..`, empty path segments and paths outside the sandbox. Text APIs use
UTF-8; binary APIs use `Uint8Array`. Missing files reject on reads and resolve
to `{ exists: false }` from `stat`. These APIs are for project-owned files:
source files, generated reports or user-visible artifacts. Use `ctx.storage`
instead for plugin-owned counters, flags, preferences and caches.

```ts
import type { ActivateContext } from "@idea/plugin-sdk";

export async function activate(ctx: ActivateContext): Promise<void> {
  const workspace = ctx.services?.workspace;
  const project = await workspace?.getCurrentProject();
  if (!workspace || !project) return;

  await workspace.writeTextFile("hello-plugin-report.txt", "hello\n", project.id);

  const file = await workspace.readTextFile("hello-plugin-report.txt", project.id);
  const listing = await workspace.listDirectory(".", project.id);
  const stat = await workspace.stat(file.path, project.id);

  ctx.logger.info("workspace file", {
    path: file.path,
    bytes: stat.len,
    entries: listing.entries.length
  });
}
```

`watch(path, handler, projectId?)` subscribes to public workspace file-change
events for the given relative path. It is best-effort and bounded: plugins should
handle missed events by refreshing their own derived state when needed.

### Project Structure

`queryStructure()` returns a bounded, generic read model so plugins do not each
need to rescan the whole workspace for common markers:

```ts
const structure = await ctx.services?.workspace.queryStructure({
  maxDepth: 3,
  maxEntries: 500
});

for (const convention of structure?.conventions ?? []) {
  console.log(convention.id, convention.markerPath);
}
```

The MVP detects generic marker-file conventions such as `package.json`,
`Cargo.toml`, `pyproject.toml`, `go.mod`, `Makefile` and `.git`. It deliberately
does not expose language-specific ASTs or Android-specific concepts.

Current terminal scope is intentionally minimal: it opens or reattaches a shell
PTY, writes bytes, resizes, detaches and closes.

### Command Tasks

Use `ctx.services.tasks.runCommand()` for non-interactive tools that should be
tracked as IdeA background tasks instead of opening a raw PTY. `command` and
`args` are passed separately, `cwd` is relative to the project root, and `env`
adds process environment variables. The current host requires an `ownerAgentId`
so the task can appear in Work and completion can be correlated to an agent.

```ts
import type { ActivateContext } from "@idea/plugin-sdk";

export async function activate(ctx: ActivateContext): Promise<void> {
  const project = await ctx.services?.workspace.getCurrentProject();
  if (!project) return;

  const task = await ctx.services?.tasks.runCommand({
    projectId: project.id,
    ownerAgentId: "00000000-0000-0000-0000-000000000000",
    label: "Check npm",
    command: "npm",
    args: ["--version"],
    cwd: ".",
    env: { CI: "1" },
    recordOnly: true
  });

  const status = await ctx.services?.tasks.getCommandStatus(task.taskId);
  ctx.logger.info("command task", {
    taskId: task.taskId,
    state: status?.state,
    exitCode: status?.exitCode
  });
}
```

`list`, `getStatus`, `attachOutput`, `cancel` and `retry` continue to operate on
tasks visible through IdeA's Work read model. `getCommandStatus` reads a launched
command task directly from the host task store.

### Toolchain Diagnostics

Use `ctx.services.tooling.diagnose()` to check external prerequisites without
hard-coding one stack into the SDK. A request can probe executables, inspect
environment variables and validate workspace files in one structured result.

```ts
import type { ActivateContext } from "@idea/plugin-sdk";

export async function activate(ctx: ActivateContext): Promise<void> {
  const diagnostic = await ctx.services?.tooling.diagnose({
    tools: [
      {
        id: "node",
        executable: "node",
        versionArgs: ["--version"],
        required: true
      }
    ],
    env: [{ name: "PATH", required: true }],
    files: [{ path: "package.json", kind: "file" }]
  });

  const node = diagnostic?.tools.find((tool) => tool.id === "node");
  ctx.logger.info("tooling diagnostic", {
    ok: diagnostic?.ok,
    nodePresent: node?.present,
    nodeVersion: node?.version,
    messages: diagnostic?.messages
  });
}
```

The diagnostic API is intentionally generic: it does not install tools, does not
model Android devices or emulators, and does not expose language-specific ASTs.

### Events And Watch

Use `ctx.services.events.subscribe()` for stable public host/project events. The
runtime hides the host polling details and returns a disposable subscription.

```ts
import type { ActivateContext } from "@idea/plugin-sdk";

export async function activate(ctx: ActivateContext): Promise<void> {
  const subscription = await ctx.services?.events.subscribe(
    {
      eventTypes: ["backgroundTaskChanged"],
      capacity: 100,
      onDropped: (count) => ctx.logger.warn("plugin events dropped", { count })
    },
    (event) => {
      if (event.type === "backgroundTaskChanged") {
        ctx.logger.info("task changed", {
          taskId: event.taskId,
          state: event.state
        });
      }
    }
  );

  if (subscription) ctx.subscriptions.push(subscription);

  const watch = await ctx.services?.workspace.watch("src", (event) => {
    ctx.logger.info("workspace changed", {
      path: event.path,
      kind: event.kind,
      operation: event.operation
    });
  });

  if (watch) ctx.subscriptions.push(watch);
}
```

Public event retention is `bestEffortBounded`: events are retained per
subscription up to the requested/host-capped capacity, drained oldest-first, and
`onDropped` reports when older retained events were overwritten.

### Structured Config Documents

Use `ctx.services.config` when a plugin needs to read or update a structured
project-owned configuration file without reimplementing parsing and
serialization. Do not use project config documents as the default persistence
mechanism for plugin-internal state; use `ctx.storage` for that.

First-lot format support is deliberately narrow:

- `json` only;
- inferred from `.json` when `format` is omitted;
- serialized as pretty JSON with a trailing newline;
- update modes: `mergePatch` and `replace`;
- `mergePatch` follows JSON merge-patch semantics: object keys are merged
  recursively and `null` removes a key.

```ts
import type { ActivateContext } from "@idea/plugin-sdk";

export async function activate(ctx: ActivateContext): Promise<void> {
  const config = await ctx.services?.config.readDocument({
    path: "tooling.config.json"
  });

  await ctx.services?.config.updateDocument({
    path: "tooling.config.json",
    mode: "mergePatch",
    value: {
      enabled: true,
      lastReadFormat: config?.format ?? "json"
    }
  });
}
```

YAML, TOML, XML, `.properties` and stack-specific config models are not part of
this first lot.

Declare the additive `tooling` capability to receive `ctx.services` at runtime:

```json
{
  "capabilities": ["ui", "tooling"]
}
```

## Manifest Validation

```ts
import { validatePluginManifest } from "@idea/plugin-sdk";

const result = validatePluginManifest(manifestJson);
if (!result.success) {
  console.error(result.errors);
}
```

This validator is deliberately strict for core fields and permissive about future unknown fields.
It is not a security boundary.