BrowserSkill/packages/dsh-plugin-browserskill/src/index.ts

/**
 * dsh-plugin-browserskill — a DeepSeek Harness bundle that registers
 * BrowserSkill (`bsk`) browser automation as model-visible tools.
 *
 * Each tool spawns `bsk <cmd> --json`, parses the structured output, and
 * returns a canonical JSON value. The plugin tracks the sessions it starts so
 * one agent conversation can drive several browsers at once; unloading the
 * plugin stops every tracked session and kills any in-flight bsk children.
 *
 * @module dsh-plugin-browserskill
 */

import type { Context } from "@deepseek-ai/cordis";
import Schema from "@deepseek-ai/schemastery";
import { armLazyTools } from "./lazy-tools";
import { ObservationService } from "./observation";
import { registerObservationRoutes } from "./observation-http";
import { KeyedExecutor } from "./queue";
import { type BskRunner, createBskRunner } from "./runner";
import { SessionRegistry } from "./sessions";
import { registerBskSkill } from "./skill";
import { type PluginConfig, registerTools } from "./tools";

export const name = "dsh-plugin-browserskill";
export const inject = ["tools"];

/** Runtime configuration schema (validated and defaulted by Cordis). */
export const Config = Schema.object({
  bskPath: Schema.string()
    .default("bsk")
    .description("Path to the bsk CLI binary (defaults to resolving `bsk` from PATH)."),
  defaultTimeoutMs: Schema.number()
    .default(120_000)
    .description("Default per-command timeout in milliseconds."),
  maxSessions: Schema.number()
    .default(5)
    .description("Maximum number of concurrent browser sessions started through this plugin."),
  observationEnabled: Schema.boolean()
    .default(true)
    .description("Track per-session observation state (action/url/thumbnail) for the PiP overlay."),
  thumbnailIntervalMs: Schema.number()
    .default(1500)
    .description("Thumbnail refresh cadence for active sessions (milliseconds)."),
  idleIntervalMs: Schema.number()
    .default(8000)
    .description("Thumbnail refresh cadence for idle sessions; also the recent-activity window."),
  lazyTools: Schema.boolean()
    .default(true)
    .description(
      "Reveal the browser_* tools only after the browser-skill skill is invoked (default true); " +
        "false registers the full suite at load.",
    ),
});

export type Config = PluginConfig;

/** Test seams: swap the process runner (unit tests never spawn a real bsk). */
export interface ApplyOptions {
  runnerFactory?: (bskPath: string) => BskRunner;
}

export function apply(
  ctx: Context,
  config: Partial<PluginConfig> = {},
  options: ApplyOptions = {},
): void {
  const resolved: PluginConfig = {
    bskPath: config.bskPath ?? "bsk",
    defaultTimeoutMs: config.defaultTimeoutMs ?? 120_000,
    maxSessions: config.maxSessions ?? 5,
    observationEnabled: config.observationEnabled ?? true,
    thumbnailIntervalMs: config.thumbnailIntervalMs ?? 1500,
    idleIntervalMs: config.idleIntervalMs ?? 8000,
    lazyTools: config.lazyTools ?? true,
  };
  const runner = options.runnerFactory?.(resolved.bskPath) ?? createBskRunner(resolved.bskPath);
  const registry = new SessionRegistry(resolved.maxSessions);
  const queue = new KeyedExecutor();
  const observation = new ObservationService({
    ctx,
    runner,
    registry,
    queue,
    options: {
      enabled: resolved.observationEnabled,
      thumbnailIntervalMs: resolved.thumbnailIntervalMs,
      idleIntervalMs: resolved.idleIntervalMs,
    },
  });

  // Progressive disclosure of the BSK agent skill (catalog entry resident,
  // body on demand) through the official skill seam; silent no-op when the
  // composition lacks it. With lazyTools on, the skill entry is initially the
  // ONLY model-visible advertisement — the tool suite reveals itself on a
  // successful skill invocation (or a session whose history already has one).
  const unregisterSkill = registerBskSkill(ctx);
  const removeSuite = resolved.lazyTools
    ? armLazyTools(ctx, () =>
        registerTools({ ctx, runner, registry, config: resolved, observation, queue }),
      )
    : registerTools({ ctx, runner, registry, config: resolved, observation, queue });
  // Route registration rides ctx.inject: the webServer service may be provided
  // AFTER this plugin loads, and in headless compositions it never appears (the
  // callback simply never runs, leaving the rest of the plugin unaffected).
  let removeRoutes: () => void = () => {};
  ctx.inject(["webServer"], (injected) => {
    removeRoutes = registerObservationRoutes(injected, observation);
    return () => removeRoutes();
  });

  // Non-blocking install probe: warn early when bsk is missing instead of
  // failing the first tool call with a bare spawn error. Uses --version on
  // purpose — it answers without starting the daemon (`bsk status` would
  // ensure-spawn one, an expensive side effect for a probe).
  runner.run(["--version"], { timeoutMs: 10_000 }).then(
    () => {},
    (error: unknown) => {
      const detail = error instanceof Error ? error.message : String(error);
      console.warn(
        `[${name}] bsk probe failed (${detail}); browser tools will report install guidance until the bsk CLI is available`,
      );
    },
  );

  // Unload cleanup: kill in-flight children, then stop every session this
  // plugin OWNS (created via browser_session_start). Referenced or unknown
  // sessions belonging to other programs on the shared daemon are never
  // touched; per-stop failures (already stopped externally, daemon restart)
  // are swallowed so one stale handle cannot abort the rest.
  ctx.effect(() => {
    return () => {
      removeSuite();
      unregisterSkill();
      removeRoutes();
      observation.dispose();
      runner.killAll();
      const stops = registry
        .ownedIds()
        .map((sessionId) =>
          runner.run(["session", "stop", sessionId], { timeoutMs: 15_000 }).catch(() => {}),
        );
      return Promise.all(stops).then(() => {});
    };
  });
}

export type { ObservationEvent, ObservationOptions, SessionObservation } from "./observation";
export { ObservationService } from "./observation";
export { registerObservationRoutes } from "./observation-http";
export { KeyedExecutor } from "./queue";
export type { BskRunner, BskRunResult, SpawnImpl } from "./runner";
export { BskError, createBskRunner } from "./runner";
export { SessionRegistry } from "./sessions";
export type { PluginConfig, ToolDeps } from "./tools";
export { registerTools } from "./tools";