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{\n  type CallToolResult,\n  type JsonObject,\n  type JsonRpcMessage,\n  type JsonRpcRequest,\n  type JsonRpcId,\n  type RegisteredTool,\n  type ServerCapabilities,\n  type ServerInfo,\n  type ToolDefinition,\n  type ToolHandler,\n  JSONRPC_INTERNAL_ERROR,\n  JSONRPC_INVALID_PARAMS,\n  JSONRPC_METHOD_NOT_FOUND,\n  MCP_PROTOCOL_VERSION,\n} from \"./types\";\nimport { ToolRegistry } from \"./tool-host\";\n\nexport type McpServerOptions = {\n  info: ServerInfo;\n  /** Defaults to { tools: { listChanged: true } } */\n  capabilities?: ServerCapabilities;\n  /** Free-text instructions surfaced to clients during initialize. */\n  instructions?: string;\n  /**\n   * The protocol revisions this server speaks, NEWEST FIRST.\n   *\n   * `initialize` echoes the client's requested revision when it is in this\n   * list, and answers the first entry otherwise — the spec's rule, which leaves\n   * the client to decide whether it can live with the answer.\n   *\n   * Defaults to `[MCP_PROTOCOL_VERSION]`: one revision, answered whatever the\n   * client asks, which is exactly what this server did before the option\n   * existed. Only list a revision the tools you register are correct under.\n   */\n  protocolVersions?: readonly string[];\n};\n\nexport type Transport = {\n  /** Called by the server when it has a message to deliver to the client. */\n  send: (message: JsonRpcMessage) => void;\n  /** Called by the server when it's torn down so the transport can clean up. */\n  close?: () => void;\n};\n\n/**\n * MicroMcpServer — protocol-level MCP server, transport-agnostic.\n *\n * Use it like:\n *\n *   const server = new MicroMcpServer({ info: { name: \"session\", version: \"0.1\" } });\n *   server.registerTool({ name: \"...\", inputSchema: { type: \"object\" } }, async (args) => ({...}));\n *   const transport = new InProcessTransport();\n *   server.attach(transport);\n *   transport.deliver({ ... }); // client → server frames\n *\n * The same server can serve multiple transports (e.g. an in-process agent\n * AND a relayed external client) by attaching each one.\n */\nexport class MicroMcpServer extends ToolRegistry {\n  private transports = new Set<Transport>();\n  /**\n   * Transports owed a `tools/list_changed` at the end of this tick. Empty when\n   * none is scheduled. See {@link scheduleListChangedNotification}.\n   */\n  private listChangedOwed = new Set<Transport>();\n\n  readonly info: ServerInfo;\n  readonly capabilities: ServerCapabilities;\n  readonly instructions?: string;\n  readonly protocolVersions: readonly string[];\n\n  constructor(options: McpServerOptions) {\n    super();\n    this.info = options.info;\n    this.capabilities = options.capabilities ?? { tools: { listChanged: true } };\n    this.instructions = options.instructions;\n    if (options.protocolVersions && options.protocolVersions.length === 0) {\n      // No answer exists for a client's initialize. Fail here, next to the\n      // mistake, rather than in a handshake nobody is watching.\n      throw new Error(\"MicroMcpServer: protocolVersions is empty — a server must speak at least one protocol revision.\");\n    }\n    this.protocolVersions = options.protocolVersions ? [...options.protocolVersions] : [MCP_PROTOCOL_VERSION];\n  }\n\n  attach(transport: Transport): () => void {\n    this.transports.add(transport);\n    return () => this.detach(transport);\n  }\n\n  detach(transport: Transport): void {\n    if (this.transports.delete(transport)) {\n      transport.close?.();\n    }\n  }\n\n  unregisterTool(name: string): void {\n    if (this.tools.delete(name)) {\n      this.scheduleListChangedNotification();\n    }\n  }\n\n  protected onToolsChanged(): void {\n    this.scheduleListChangedNotification();\n  }\n\n  /**\n   * Receive a JSON-RPC frame from a client (called by the transport).\n   * The transport is responsible for sending the response back.\n   */\n  async receive(transport: Transport, message: JsonRpcMessage): Promise<void> {\n    if (!(\"method\" in message)) return; // It's a response, not a request — ignore.\n\n    const isNotification = !(\"id\" in message);\n    if (isNotification) {\n      // Notifications are fire-and-forget. We ignore unknown methods.\n      return;\n    }\n\n    const request = message as JsonRpcRequest;\n    try {\n      const result = await this.handle(request, transport);\n      transport.send({ jsonrpc: \"2.0\", id: request.id, result });\n    } catch (err) {\n      transport.send({\n        jsonrpc: \"2.0\",\n        id: request.id,\n        error: this.toRpcError(err),\n      });\n    }\n  }\n\n  private async handle(request: JsonRpcRequest, transport: Transport): Promise<any> {\n    const { method, params } = request;\n    switch (method) {\n      case \"initialize\":\n        return {\n          protocolVersion: this.negotiate(params?.protocolVersion),\n          capabilities: this.capabilities,\n          serverInfo: this.info,\n          ...(this.instructions ? { instructions: this.instructions } : {}),\n        };\n\n      case \"tools/list\":\n        return { tools: this.listTools() };\n\n      case \"tools/call\": {\n        const name = params?.name;\n        const args = (params?.arguments ?? {}) as JsonObject;\n        if (typeof name !== \"string\") {\n          throw rpcError(JSONRPC_INVALID_PARAMS, \"tools/call requires `name`\");\n        }\n        const tool = this.tools.get(name);\n        if (!tool) {\n          throw rpcError(JSONRPC_METHOD_NOT_FOUND, this.missingToolMessage(name));\n        }\n        const result = await tool.handler(args, { transport });\n        return result satisfies CallToolResult;\n      }\n\n      case \"ping\":\n        return {};\n\n      default:\n        throw rpcError(JSONRPC_METHOD_NOT_FOUND, `Unsupported method: ${method}`);\n    }\n  }\n\n  /** The revision to answer `initialize` with: the one asked for if spoken, else the newest. */\n  private negotiate(requested: unknown): string {\n    return typeof requested === \"string\" && this.protocolVersions.includes(requested)\n      ? requested\n      : this.protocolVersions[0];\n  }\n\n  /**\n   * Tell the transports that SAW the old tool list that it changed.\n   *\n   * Changes in one tick coalesce into one notification. The recipients are the\n   * transports attached at the moment of a change, not at the moment the\n   * notification goes out: a transport attached afterwards never had the old\n   * list, so \"your list is stale\" is noise to it — and on stdio, where a host\n   * builds the server and attaches stdin/stdout in the same tick, it was the\n   * first frame a client received, before it had even sent `initialize`.\n   */\n  private scheduleListChangedNotification(): void {\n    if (this.transports.size === 0) return;\n    const scheduled = this.listChangedOwed.size > 0;\n    for (const t of this.transports) this.listChangedOwed.add(t);\n    if (scheduled) return;\n    queueMicrotask(() => {\n      const owed = this.listChangedOwed;\n      this.listChangedOwed = new Set();\n      for (const t of owed) {\n        // Detached since the change: it is not listening any more.\n        if (this.transports.has(t)) t.send({ jsonrpc: \"2.0\", method: \"notifications/tools/list_changed\" });\n      }\n    });\n  }\n\n  /** Send an application notification to every client, or one attached transport. */\n  notify(message: JsonRpcMessage, transport?: Transport): void {\n    if (transport) transport.send(message);\n    else this.broadcast(message);\n  }\n\n  private broadcast(message: JsonRpcMessage): void {\n    for (const t of this.transports) t.send(message);\n  }\n\n  private toRpcError(err: unknown): { code: number; message: string; data?: any } {\n    if (err && typeof err === \"object\" && \"code\" in err && \"message\" in err) {\n      return err as any;\n    }\n    return {\n      code: JSONRPC_INTERNAL_ERROR,\n      message: err instanceof Error ? err.message : String(err),\n    };\n  }\n}\n\nexport function rpcError(code: number, message: string, data?: any) {\n  return { code, message, ...(data !== undefined ? { data } : {}) };\n}\n\n/**\n * Helper to build a CallToolResult from a string or structured value.\n */\nexport function textResult(text: string, structured?: any): CallToolResult {\n  return {\n    content: [{ type: \"text\", text }],\n    ...(structured !== undefined ? { structuredContent: structured } : {}),\n  };\n}\n\nexport function errorResult(text: string): CallToolResult {\n  return { content: [{ type: \"text\", text }], isError: true };\n}\n\n// Internal helper so the JsonRpcId import isn't dropped by tsup\ntype _KeepIdImport = JsonRpcId;\n","import type { CallToolResult } from \"../mcp/types\";\nimport { emitActivity } from \"./registry\";\nimport type { AgentTarget } from \"./types\";\n\nexport type ActivityAgent = { id: string; name?: string; color?: string };\n\nexport type ActivityResolverContext<TArgs = Record<string, unknown>> = {\n  /** Tool name as registered. */\n  toolName: string;\n  /** Arguments the tool was called with. */\n  args: TArgs;\n  /** The CallToolResult the underlying handler produced. */\n  result: CallToolResult;\n};\n\n/**\n * Resolves an `AgentTarget` for an executed tool. Bridges declare one of\n * these per registration so the wrapper knows which surface / element /\n * screen the activity belongs to.\n *\n * The resolver runs AFTER the tool handler so it can inspect the result\n * (e.g. read a newly-created item id from `structuredContent`).\n */\nexport type ActivityTargetResolver<TArgs = Record<string, unknown>> = (\n  ctx: ActivityResolverContext<TArgs>,\n) => AgentTarget | null;\n\nexport type ToolHandler<TArgs = Record<string, unknown>> = (\n  args: TArgs,\n) => Promise<CallToolResult> | CallToolResult;\n\n/**\n * wrapToolWithActivity — decorate a bridge tool handler so every successful\n * call emits an `AgentActivityEvent`. Returns a new handler with the same shape.\n *\n * Usage in a bridge:\n *\n *   server.registerTool(\n *     definition,\n *     wrapToolWithActivity(\n *       handler,\n *       { agent, kind: \"whiteboard\", resolveTarget: ({ args }) => ({\n *           kind: \"whiteboard\", elementId: args.id as string,\n *         }) },\n *     ),\n *   );\n */\nexport function wrapToolWithActivity<TArgs = Record<string, unknown>>(\n  handler: ToolHandler<TArgs>,\n  options: {\n    toolName: string;\n    agent: ActivityAgent;\n    /** Optional fancy-screens screen id this bridge is scoped to. */\n    screenId?: string;\n    /** Default target kind if the resolver returns one without `kind`. */\n    kind: AgentTarget[\"kind\"];\n    /** Per-call resolver. Return `null` to skip emitting (e.g. for read-only tools). */\n    resolveTarget?: ActivityTargetResolver<TArgs>;\n    /** Optional ttl override. */\n    ttlMs?: number;\n    /**\n     * Build the `meta` broadcast to all relay peers. Defaults to the tool's full\n     * `structuredContent`. Override to REDACT sensitive fields before fan-out —\n     * e.g. the terminal bridge strips raw command/keystroke bytes so a command\n     * line (or its secrets) is never broadcast verbatim to every peer.\n     */\n    buildMeta?: (result: CallToolResult) => Record<string, unknown> | undefined;\n  },\n): ToolHandler<TArgs> {\n  return async (args) => {\n    const result = await handler(args);\n    if (result.isError) return result;\n\n    let target: AgentTarget | null;\n    if (options.resolveTarget) {\n      target = options.resolveTarget({ toolName: options.toolName, args, result });\n    } else {\n      target = { kind: options.kind, screenId: options.screenId };\n    }\n    if (!target) return result;\n\n    emitActivity({\n      agentId: options.agent.id,\n      agentName: options.agent.name,\n      agentColor: options.agent.color,\n      target: { ...target, kind: target.kind ?? options.kind, screenId: target.screenId ?? options.screenId },\n      action: options.toolName,\n      timestamp: Date.now(),\n      meta: options.buildMeta ? options.buildMeta(result) : extractMeta(result),\n      ttlMs: options.ttlMs,\n    });\n    return result;\n  };\n}\n\nfunction extractMeta(result: CallToolResult): Record<string, unknown> | undefined {\n  const sc = result.structuredContent;\n  if (sc && typeof sc === \"object\" && !Array.isArray(sc)) {\n    return sc as Record<string, unknown>;\n  }\n  return undefined;\n}\n","import { textResult, errorResult } from \"../mcp/server\";\nimport type { ToolHost } from \"../mcp/tool-host\";\nimport { readHistory, redoOne, undoOne } from \"./undo-stack\";\n\nexport type UndoToolsOptions = {\n  /** Default agent id when the caller doesn't pass one. */\n  defaultAgentId?: string;\n};\n\n/**\n * Idempotent tracker so multiple bridges on the same server only register\n * agent_undo / agent_redo / agent_history once.\n */\nconst installedHosts = new WeakSet<ToolHost>();\n\n/**\n * The one owner every copy of the undo tools registers under. They are SHARED\n * on purpose — every bridge ensures them, and a host may also call\n * `registerUndoTools` itself — so all of those are the same registrant, and a\n * second registration replaces the first instead of being refused as a\n * collision. Anything else claiming `agent_undo` is still refused.\n */\nconst UNDO_TOOLS_OWNER = \"agent-undo\";\n\n/**\n * ensureUndoToolsRegistered — bridges call this on construction. Safe to\n * call repeatedly with the same server; subsequent calls are no-ops.\n */\nexport function ensureUndoToolsRegistered(host: ToolHost, options: UndoToolsOptions = {}): void {\n  if (installedHosts.has(host)) return;\n  installedHosts.add(host);\n  registerUndoTools(host, options);\n}\n\n/**\n * registerUndoTools — add agent_undo / agent_redo / agent_history to the\n * server. Returns a disposer that unregisters all three.\n */\nexport function registerUndoTools(host: ToolHost, options: UndoToolsOptions = {}): () => void {\n  const defaultAgent = options.defaultAgentId ?? \"agent\";\n  const disposers: Array<() => void> = [];\n  const agentOf = (args: any): string =>\n    typeof args?.agentId === \"string\" ? args.agentId : defaultAgent;\n\n  disposers.push(\n    host.registerTool(\n      {\n        name: \"agent_undo\",\n        description: \"Undo the most recent action on the agent's stack. Optional agentId targets a specific agent.\",\n        inputSchema: {\n          type: \"object\",\n          properties: { agentId: { type: \"string\" } },\n          additionalProperties: false,\n        },\n      },\n      async (args) => {\n        const entry = await undoOne(agentOf(args));\n        if (!entry) return errorResult(\"Nothing to undo.\");\n        return textResult(`Undid: ${entry.label}`, { entry: serialize(entry) });\n      },\n      { owner: UNDO_TOOLS_OWNER },\n    ),\n  );\n\n  disposers.push(\n    host.registerTool(\n      {\n        name: \"agent_redo\",\n        description: \"Redo the most recently undone action.\",\n        inputSchema: {\n          type: \"object\",\n          properties: { agentId: { type: \"string\" } },\n          additionalProperties: false,\n        },\n      },\n      async (args) => {\n        const entry = await redoOne(agentOf(args));\n        if (!entry) return errorResult(\"Nothing to redo.\");\n        return textResult(`Redid: ${entry.label}`, { entry: serialize(entry) });\n      },\n      { owner: UNDO_TOOLS_OWNER },\n    ),\n  );\n\n  disposers.push(\n    host.registerTool(\n      {\n        name: \"agent_history\",\n        description: \"List the agent's undo stack (oldest first). Useful for understanding what's reversible.\",\n        inputSchema: {\n          type: \"object\",\n          properties: { agentId: { type: \"string\" } },\n          additionalProperties: false,\n        },\n      },\n      async (args) => {\n        const history = readHistory(agentOf(args)).map(serialize);\n        const text = history.map((e) => `${new Date(e.timestamp).toISOString()} ${e.bridgeId} ${e.action}: ${e.label}`).join(\"\\n\");\n        return textResult(text || \"(empty)\", history);\n      },\n      { owner: UNDO_TOOLS_OWNER },\n    ),\n  );\n\n  return () => disposers.forEach((d) => d());\n}\n\nfunction serialize(entry: import(\"./undo-stack\").UndoEntry) {\n  return {\n    timestamp: entry.timestamp,\n    bridgeId: entry.bridgeId,\n    action: entry.action,\n    label: entry.label,\n  };\n}\n","import { textResult, errorResult } from \"../mcp/server\";\nimport type { ToolHost } from \"../mcp/tool-host\";\nimport type { JsonObject } from \"../mcp/types\";\nimport type { Bridge } from \"./types\";\nimport { wrapToolWithActivity } from \"../presence/wrap-tool-with-activity\";\nimport type { AgentTarget } from \"../presence/types\";\nimport { pushUndoEntry } from \"../undo/undo-stack\";\nimport { ensureUndoToolsRegistered } from \"../undo/undo-tools\";\n\n/**\n * Headless bridge for `@particle-academy/fancy-features` — feature management\n * with NO UI surface. The adapter is the `FeatureManager` (a `FeatureSource`\n * consumer): define features in the registry, check access for a subject,\n * grant/revoke via group assignment, and meter resource usage. Mutations\n * funnel through `wrapToolWithActivity` so presence + undo compose; `grant` /\n * `revoke` are `pendingMode`-gated (they change what a real user can do).\n *\n * The adapter shapes mirror fancy-features' public `FeatureManager` +\n * `FeatureRegistry` + `GroupStore`, defined LOCALLY so the bridge builds with\n * the sibling absent (optional peer). A live `FeatureManager` (plus its\n * `.registry` / `.groupStore`) satisfies this structurally with no import.\n *\n * SUBJECTS over the wire: `Subject` is opaque (`unknown`) in fancy-features.\n * Agents pass a JSON-serializable subject (string id or `{ id, … }` object);\n * the host's stores key on it via their `defaultSubjectKey`.\n */\n\nexport type FeatureGrant = {\n  key: string;\n  type: \"boolean\" | \"resource\";\n  enabled: boolean;\n  includedQuantity?: number | null;\n  overageLimit?: number | null;\n  source?: string;\n  config?: Record<string, unknown>;\n};\n\n/** Normalized feature definition (mirror of fancy-features `FeatureDefinition`). */\nexport type FeatureDefinition = {\n  key?: string;\n  name?: string;\n  description?: string;\n  type?: \"boolean\" | \"resource\";\n  enabled?: boolean;\n  limit?: number;\n  [k: string]: unknown;\n};\n\n/**\n * Adapter = the `FeatureManager` + its registry + group store. The bridge only\n * needs these members; a real manager exposes them directly.\n */\nexport type FeaturesBridgeAdapter = {\n  /** Stable id for this feature manager instance. */\n  id?: string;\n  title?: string;\n  screenId?: string;\n\n  // ── Access checks (FeatureManager) ──\n  /** Can the subject access the feature now? `manager.canAccess`. */\n  canAccess(feature: string, subject?: unknown, context?: unknown): boolean | Promise<boolean>;\n  /** Remaining quota for a resource feature (null = unlimited / n-a). `manager.remaining`. */\n  remaining(feature: string, subject?: unknown, context?: unknown): number | null | Promise<number | null>;\n  /** All enabled feature keys for the subject. `manager.enabled`. */\n  enabled(subject?: unknown, context?: unknown): string[] | Promise<string[]>;\n  /** Trace a feature's resolution to an AccessResult. `manager.explain`. */\n  explain?(feature: string, subject?: unknown, context?: unknown): Promise<unknown> | unknown;\n\n  // ── Registry (define) ──\n  /** Register a programmatic feature. `manager.registerFeature` / `manager.registry.register`. */\n  registerFeature(key: string, definition: FeatureDefinition): void;\n  /** Registered feature keys. `manager.registry.keys`. */\n  registryKeys(): string[];\n  /** Resolve a registered definition (or null). `manager.registry.definition`. */\n  definition?(key: string): FeatureDefinition | null | Promise<FeatureDefinition | null>;\n\n  // ── Group store (grant / revoke) ──\n  /** Assign a subject to a feature group (the grant primitive). `manager.groupStore.assign`. */\n  assignGroup(subject: unknown, groupKey: string): void | Promise<void>;\n  /** Detach a subject from a group (the revoke primitive). `manager.groupStore.detach`. */\n  detachGroup(subject: unknown, groupKey: string): void | Promise<void>;\n  /** Group keys assigned to a subject. `manager.groupStore.list`. */\n  listGroups(subject: unknown): string[] | Promise<string[]>;\n\n  // ── Usage / metering (resource features) ──\n  /** Current usage for a resource feature. `manager.usageFor`. Optional. */\n  usageFor?(feature: string, subject: unknown): number | Promise<number>;\n  /** Atomic check-and-increment quota. `manager.tryConsume`. Optional. */\n  tryConsume?(feature: string, subject: unknown, amount?: number, context?: unknown): boolean | Promise<boolean>;\n};\n\nexport type FeaturesBridgeOptions = {\n  adapter: FeaturesBridgeAdapter;\n  agent?: { id: string; name?: string; color?: string };\n  /**\n   * Trust-but-verify. When on (default), `features_grant` / `features_revoke`\n   * (they change a real subject's entitlements) require `confirm:true` OR a\n   * host `confirm` hook. Checks + define + usage are unaffected.\n   */\n  pendingMode?: boolean;\n  confirm?: (req: { action: string; subject: unknown; groupKey: string }) => Promise<boolean> | boolean;\n};\n\nconst DEFAULT_AGENT = { id: \"agent\", name: \"Agent\", color: \"#a855f7\" };\n\nconst str = (v: unknown, fallback = \"\"): string => (typeof v === \"string\" ? v : fallback);\nconst num = (v: unknown, fallback = 0): number => (typeof v === \"number\" && Number.isFinite(v) ? v : fallback);\n\n/**\n * registerFeaturesBridge — full MCP tool set over a headless feature manager.\n *\n *   features_list      enabled feature keys for a subject\n *   features_check     can a subject access a feature? (+ remaining for resources)\n *   features_explain   trace why a feature is on/off for a subject\n *   features_define    register a feature definition (boolean / resource)\n *   features_grant     assign a subject to a group (pendingMode-gated, undoable)\n *   features_revoke    detach a subject from a group (pendingMode-gated, undoable)\n *   features_groups    list a subject's assigned groups\n *   features_consume   meter a resource feature (atomic check-and-increment)\n */\nexport function registerFeaturesBridge(host: ToolHost, options: FeaturesBridgeOptions): Bridge {\n  const { adapter } = options;\n  const agent = { ...DEFAULT_AGENT, ...(options.agent ?? {}) };\n  const pendingMode = options.pendingMode ?? true;\n  const featuresId = adapter.id ?? \"features\";\n  const disposers: Array<() => void> = [];\n  // The bridge id is also its registrant identity on the host: the same bridge\n  // may re-register (a remount), a different one claiming a name is refused.\n  const bridgeId = `features:${featuresId}`;\n\n  ensureUndoToolsRegistered(host, { defaultAgentId: agent.id });\n\n  const target = (elementId?: string, label?: string): AgentTarget => ({\n    kind: \"custom\",\n    screenId: adapter.screenId,\n    elementId,\n    label: label ?? featuresId,\n  });\n\n  const reg = (\n    name: string,\n    description: string,\n    properties: Record<string, unknown>,\n    required: string[],\n    handler: (args: JsonObject) => Promise<unknown> | unknown,\n    resolveTarget: false | ((args: JsonObject) => AgentTarget),\n  ) => {\n    const wrapped = async (args: JsonObject) => {\n      try {\n        return await handler(args);\n      } catch (e) {\n        return errorResult(e instanceof Error ? e.message : String(e));\n      }\n    };\n    const final = resolveTarget\n      ? wrapToolWithActivity(wrapped as never, {\n          toolName: name,\n          agent,\n          kind: \"custom\",\n          screenId: adapter.screenId,\n          resolveTarget: ({ args }) => resolveTarget(args as JsonObject),\n        })\n      : wrapped;\n    disposers.push(\n      host.registerTool(\n        { name, description, inputSchema: { type: \"object\", properties: properties as Record<string, never>, required, additionalProperties: false } },\n        final as never,\n        { owner: bridgeId },\n      ),\n    );\n  };\n\n  const guardGrant = async (action: string, subject: unknown, groupKey: string, hasConfirmArg: boolean) => {\n    if (!pendingMode) return null;\n    if (options.confirm) {\n      const ok = await options.confirm({ action, subject, groupKey });\n      return ok ? null : errorResult(`Declined: ${action} ${groupKey} (human did not confirm).`);\n    }\n    if (!hasConfirmArg) {\n      return errorResult(`${action} is staged (pendingMode). Re-call with confirm:true to apply, or wire a host confirm hook.`);\n    }\n    return null;\n  };\n\n  // ─── Read / check tools ──────────────────────────────────────────────────\n\n  reg(\n    \"features_list\",\n    \"List the feature keys enabled for a subject. Pass `subject` (a string id or object).\",\n    { subject: { description: \"Opaque subject — string id or { id, … } object.\" }, context: { description: \"Optional resolution context.\" } },\n    [],\n    async (args) => {\n      const keys = await adapter.enabled(args.subject, args.context);\n      return textResult(JSON.stringify(keys, null, 2), { subject: args.subject, enabled: keys });\n    },\n    false,\n  );\n\n  reg(\n    \"features_check\",\n    \"Check whether a subject can access a feature. For resource features also returns the remaining quota.\",\n    { feature: { type: \"string\" }, subject: { description: \"Opaque subject.\" }, context: { description: \"Optional context.\" } },\n    [\"feature\"],\n    async (args) => {\n      const feature = str(args.feature);\n      const allowed = await adapter.canAccess(feature, args.subject, args.context);\n      const remaining = await adapter.remaining(feature, args.subject, args.context);\n      const out = { feature, allowed, remaining };\n      return textResult(JSON.stringify(out), out);\n    },\n    false,\n  );\n\n  reg(\n    \"features_explain\",\n    \"Trace why a feature is on/off for a subject — returns the AccessResult (source, remaining, limit, used).\",\n    { feature: { type: \"string\" }, subject: { description: \"Opaque subject.\" }, context: { description: \"Optional context.\" } },\n    [\"feature\"],\n    async (args) => {\n      if (!adapter.explain) return errorResult(\"Host did not wire explain().\");\n      const result = await adapter.explain(str(args.feature), args.subject, args.context);\n      return textResult(JSON.stringify(result, null, 2), result as Record<string, unknown>);\n    },\n    false,\n  );\n\n  reg(\n    \"features_groups\",\n    \"List the feature groups a subject is assigned to.\",\n    { subject: { description: \"Opaque subject.\" } },\n    [\"subject\"],\n    async (args) => {\n      const groups = await adapter.listGroups(args.subject);\n      return textResult(JSON.stringify(groups, null, 2), { subject: args.subject, groups });\n    },\n    false,\n  );\n\n  // ─── Define ──────────────────────────────────────────────────────────────\n\n  reg(\n    \"features_define\",\n    \"Register a feature definition. type 'boolean' (on/off) or 'resource' (metered with a `limit`). `enabled` sets the default gate.\",\n    {\n      key: { type: \"string\" },\n      name: { type: \"string\" },\n      description: { type: \"string\" },\n      type: { type: \"string\", enum: [\"boolean\", \"resource\"] },\n      enabled: { type: \"boolean\" },\n      limit: { type: \"number\", description: \"Resource quota per period (resource type).\" },\n    },\n    [\"key\"],\n    (args) => {\n      const key = str(args.key);\n      if (!key) return errorResult(\"key is required.\");\n      const existed = adapter.registryKeys().includes(key);\n      const definition: FeatureDefinition = {\n        ...(args.name !== undefined ? { name: str(args.name) } : {}),\n        ...(args.description !== undefined ? { description: str(args.description) } : {}),\n        ...(args.type !== undefined ? { type: str(args.type) as \"boolean\" | \"resource\" } : {}),\n        ...(args.enabled !== undefined ? { enabled: args.enabled === true } : {}),\n        ...(args.limit !== undefined ? { limit: num(args.limit) } : {}),\n      };\n      adapter.registerFeature(key, definition);\n      pushUndoEntry(agent.id, {\n        timestamp: Date.now(),\n        bridgeId: featuresId,\n        action: \"features_define\",\n        // Registry has no unregister; undo re-registers the prior definition when we had one.\n        label: existed ? `Redefined feature ${key}` : `Defined feature ${key}`,\n        undo: () => {},\n        redo: () => adapter.registerFeature(key, definition),\n      });\n      return textResult(`${existed ? \"Redefined\" : \"Defined\"} feature ${key} (${definition.type ?? \"boolean\"})`, { key, definition });\n    },\n    (args) => target(str(args.key), `define ${str(args.key)}`),\n  );\n\n  // ─── Grant / revoke (pendingMode-gated) ──────────────────────────────────\n\n  reg(\n    \"features_grant\",\n    \"Grant a subject access by assigning it to a feature group. Staged in pendingMode — pass confirm:true or wire a host confirm hook.\",\n    { subject: { description: \"Opaque subject.\" }, group: { type: \"string\", description: \"Feature group key.\" }, confirm: { type: \"boolean\" } },\n    [\"subject\", \"group\"],\n    async (args) => {\n      const groupKey = str(args.group);\n      if (!groupKey) return errorResult(\"group is required.\");\n      const blocked = await guardGrant(\"features_grant\", args.subject, groupKey, args.confirm === true);\n      if (blocked) return blocked;\n      const already = (await adapter.listGroups(args.subject)).includes(groupKey);\n      await adapter.assignGroup(args.subject, groupKey);\n      pushUndoEntry(agent.id, {\n        timestamp: Date.now(),\n        bridgeId: featuresId,\n        action: \"features_grant\",\n        label: `Granted group ${groupKey}`,\n        // Only reverse if WE added it (idempotent assign — don't revoke a pre-existing grant).\n        undo: async () => { if (!already) await adapter.detachGroup(args.subject, groupKey); },\n        redo: async () => { await adapter.assignGroup(args.subject, groupKey); },\n      });\n      return textResult(`Granted group ${groupKey}`, { subject: args.subject, group: groupKey });\n    },\n    (args) => target(str(args.group), `grant ${str(args.group)}`),\n  );\n\n  reg(\n    \"features_revoke\",\n    \"Revoke access by detaching a subject from a feature group. Staged in pendingMode — pass confirm:true or wire a host confirm hook.\",\n    { subject: { description: \"Opaque subject.\" }, group: { type: \"string\" }, confirm: { type: \"boolean\" } },\n    [\"subject\", \"group\"],\n    async (args) => {\n      const groupKey = str(args.group);\n      if (!groupKey) return errorResult(\"group is required.\");\n      const blocked = await guardGrant(\"features_revoke\", args.subject, groupKey, args.confirm === true);\n      if (blocked) return blocked;\n      const had = (await adapter.listGroups(args.subject)).includes(groupKey);\n      await adapter.detachGroup(args.subject, groupKey);\n      pushUndoEntry(agent.id, {\n        timestamp: Date.now(),\n        bridgeId: featuresId,\n        action: \"features_revoke\",\n        label: `Revoked group ${groupKey}`,\n        undo: async () => { if (had) await adapter.assignGroup(args.subject, groupKey); },\n        redo: async () => { await adapter.detachGroup(args.subject, groupKey); },\n      });\n      return textResult(`Revoked group ${groupKey}`, { subject: args.subject, group: groupKey });\n    },\n    (args) => target(str(args.group), `revoke ${str(args.group)}`),\n  );\n\n  // ─── Usage / metering ────────────────────────────────────────────────────\n\n  reg(\n    \"features_consume\",\n    \"Meter a resource feature: atomic check-and-increment. Returns ok:false if the quota would be exceeded (nothing recorded).\",\n    { feature: { type: \"string\" }, subject: { description: \"Opaque subject.\" }, amount: { type: \"number\", description: \"Units to consume. Default 1.\" }, context: { description: \"Optional context.\" } },\n    [\"feature\", \"subject\"],\n    async (args) => {\n      if (!adapter.tryConsume) return errorResult(\"Host did not wire usage metering (tryConsume).\");\n      const feature = str(args.feature);\n      const amount = num(args.amount, 1);\n      const ok = await adapter.tryConsume(feature, args.subject, amount, args.context);\n      const remaining = await adapter.remaining(feature, args.subject, args.context);\n      const out = { feature, ok, amount, remaining };\n      return textResult(JSON.stringify(out), out);\n    },\n    (args) => target(str(args.feature), `consume ${str(args.feature)}`),\n  );\n\n  return {\n    id: bridgeId,\n    title: adapter.title ?? \"Features\",\n    dispose: () => {\n      for (const d of disposers.splice(0)) d();\n    },\n  };\n}\n"]}