diff --git a/packages/plugins/sdk/src/host-client-factory.ts b/packages/plugins/sdk/src/host-client-factory.ts
index 3264afbc..8fc8fdfa 100644
--- a/packages/plugins/sdk/src/host-client-factory.ts
+++ b/packages/plugins/sdk/src/host-client-factory.ts
@@ -79,7 +79,7 @@ export class CapabilityDeniedError extends Error {
  */
 export class InvocationScopeDeniedError extends Error {
   override readonly name = "InvocationScopeDeniedError";
-  readonly code = PLUGIN_RPC_ERROR_CODES.CAPABILITY_DENIED;
+  readonly code = PLUGIN_RPC_ERROR_CODES.INVOCATION_SCOPE_DENIED;
 
   constructor(pluginId: string, method: string, message: string) {
     super(`Plugin "${pluginId}" is not allowed to perform "${method}": ${message}`);
diff --git a/packages/plugins/sdk/src/index.ts b/packages/plugins/sdk/src/index.ts
index 2ca0fa9a..1fbf172b 100644
--- a/packages/plugins/sdk/src/index.ts
+++ b/packages/plugins/sdk/src/index.ts
@@ -149,6 +149,9 @@ export type {
   RunJobParams,
   GetDataParams,
   PerformActionParams,
+  PluginPerformActionActorType,
+  PluginPerformActionActorContext,
+  PluginPerformActionContext,
   ExecuteToolParams,
   PluginEnvironmentDiagnostic,
   PluginEnvironmentDriverBaseParams,
diff --git a/packages/plugins/sdk/src/protocol.ts b/packages/plugins/sdk/src/protocol.ts
index 48075b2f..2c76beab 100644
--- a/packages/plugins/sdk/src/protocol.ts
+++ b/packages/plugins/sdk/src/protocol.ts
@@ -233,6 +233,8 @@ export const PLUGIN_RPC_ERROR_CODES = {
   TIMEOUT: -32003,
   /** The worker does not implement the requested optional method. */
   METHOD_NOT_IMPLEMENTED: -32004,
+  /** The worker→host call attempted to escape the current invocation company scope. */
+  INVOCATION_SCOPE_DENIED: -32005,
   /** A catch-all for errors that do not fit other categories. */
   UNKNOWN: -32099,
 } as const;
@@ -368,6 +370,28 @@ export interface GetDataParams {
  *
  * @see PLUGIN_SPEC.md §13.9 — `performAction`
  */
+export type PluginPerformActionActorType = "user" | "agent" | "system";
+
+export interface PluginPerformActionActorContext {
+  /** Authenticated principal type resolved by the Paperclip host. */
+  type: PluginPerformActionActorType;
+  /** Authenticated board user id when `type === "user"`, otherwise null. */
+  userId: string | null;
+  /** Authenticated agent id when `type === "agent"`, otherwise null. */
+  agentId: string | null;
+  /** Authenticated heartbeat/run id when available. */
+  runId: string | null;
+  /** Company id authorized by the host bridge for this action, when applicable. */
+  companyId: string | null;
+}
+
+export interface PluginPerformActionContext {
+  /** Immutable authenticated actor context supplied by the host. */
+  actor: Readonly<PluginPerformActionActorContext>;
+  /** Convenience alias for `actor.companyId`. */
+  companyId: string | null;
+}
+
 export interface PerformActionParams {
   /** Plugin-defined action key (e.g. `"resync"`). */
   key: string;
@@ -375,6 +399,8 @@ export interface PerformActionParams {
   companyId?: string | null;
   /** Action parameters from the UI. */
   params: Record<string, unknown>;
+  /** Authenticated actor context resolved by the host, never by caller params. */
+  actorContext?: PluginPerformActionActorContext | null;
   /** Optional launcher/container metadata from the host render environment. */
   renderEnvironment?: PluginLauncherRenderContextSnapshot | null;
 }
diff --git a/packages/plugins/sdk/src/testing.ts b/packages/plugins/sdk/src/testing.ts
index 299af7c6..f8f1fc26 100644
--- a/packages/plugins/sdk/src/testing.ts
+++ b/packages/plugins/sdk/src/testing.ts
@@ -57,6 +57,8 @@ import type {
   PluginEnvironmentRealizeWorkspaceResult,
   PluginEnvironmentExecuteParams,
   PluginEnvironmentExecuteResult,
+  PluginPerformActionActorContext,
+  PluginPerformActionContext,
 } from "./protocol.js";
 
 export interface TestHarnessOptions {
@@ -74,6 +76,20 @@ export interface TestHarnessLogEntry {
   meta?: Record<string, unknown>;
 }
 
+export interface TestHarnessPerformActionOptions {
+  /**
+   * Authenticated actor context to expose to the action handler. Omitted fields
+   * default to null, and `type` defaults to `system`.
+   */
+  actor?: Partial<PluginPerformActionActorContext> | null;
+  /**
+   * Host-authorized company scope. When provided, this is injected into
+   * `params.companyId` so tests match the production bridge's anti-spoofing
+   * behavior.
+   */
+  companyId?: string | null;
+}
+
 export interface TestHarness {
   /** Fully-typed in-memory plugin context passed to `plugin.setup(ctx)`. */
   ctx: PluginContext;
@@ -98,7 +114,11 @@ export interface TestHarness {
   /** Invoke a `ctx.data.register(...)` handler by key. */
   getData<T = unknown>(key: string, params?: Record<string, unknown>): Promise<T>;
   /** Invoke a `ctx.actions.register(...)` handler by key. */
-  performAction<T = unknown>(key: string, params?: Record<string, unknown>): Promise<T>;
+  performAction<T = unknown>(
+    key: string,
+    params?: Record<string, unknown>,
+    options?: TestHarnessPerformActionOptions,
+  ): Promise<T>;
   /** Execute a registered tool handler via `ctx.tools.execute(...)`. */
   executeTool<T = ToolResult>(name: string, params: unknown, runCtx?: Partial<ToolRunContext>): Promise<T>;
   /** Read raw in-memory state for assertions. */
@@ -491,7 +511,10 @@ export function createTestHarness(options: TestHarnessOptions): TestHarness {
   const jobs = new Map<string, (job: PluginJobContext) => Promise<void>>();
   const launchers = new Map<string, PluginLauncherRegistration>();
   const dataHandlers = new Map<string, (params: Record<string, unknown>) => Promise<unknown>>();
-  const actionHandlers = new Map<string, (params: Record<string, unknown>) => Promise<unknown>>();
+  const actionHandlers = new Map<
+    string,
+    (params: Record<string, unknown>, context: PluginPerformActionContext) => Promise<unknown>
+  >();
   const toolHandlers = new Map<string, (params: unknown, runCtx: ToolRunContext) => Promise<ToolResult>>();
 
   function localFolderKey(companyId: string, folderKey: string): string {
@@ -502,6 +525,41 @@ export function createTestHarness(options: TestHarnessOptions): TestHarness {
     return `${localFolderKey(companyId, folderKey)}:${relativePath}`;
   }
 
+  function stringOrNull(value: unknown): string | null {
+    return typeof value === "string" && value.trim().length > 0 ? value.trim() : null;
+  }
+
+  function actorTypeOrSystem(value: unknown): PluginPerformActionActorContext["type"] {
+    return value === "user" || value === "agent" || value === "system" ? value : "system";
+  }
+
+  function actionContextFor(
+    params: Record<string, unknown>,
+    options?: TestHarnessPerformActionOptions,
+  ): PluginPerformActionContext {
+    const actorInput = options?.actor ?? null;
+    const companyId = stringOrNull(options?.companyId) ?? stringOrNull(actorInput?.companyId) ?? stringOrNull(params.companyId);
+    const actor = Object.freeze({
+      type: actorTypeOrSystem(actorInput?.type),
+      userId: stringOrNull(actorInput?.userId),
+      agentId: stringOrNull(actorInput?.agentId),
+      runId: stringOrNull(actorInput?.runId),
+      companyId,
+    });
+    return Object.freeze({ actor, companyId });
+  }
+
+  function paramsWithHostCompanyScope(
+    params: Record<string, unknown>,
+    context: PluginPerformActionContext,
+    options?: TestHarnessPerformActionOptions,
+  ): Record<string, unknown> {
+    if (Object.prototype.hasOwnProperty.call(options ?? {}, "companyId")) {
+      return context.companyId ? { ...params, companyId: context.companyId } : { ...params };
+    }
+    return params;
+  }
+
   function normalizeLocalFolderRelativePath(relativePath: string): string {
     const parts: string[] = [];
     for (const segment of relativePath.split(/[\\/]+/)) {
@@ -2302,10 +2360,15 @@ export function createTestHarness(options: TestHarnessOptions): TestHarness {
       if (!handler) throw new Error(`No data handler registered for '${key}'`);
       return await handler(params) as T;
     },
-    async performAction<T = unknown>(key: string, params: Record<string, unknown> = {}) {
+    async performAction<T = unknown>(
+      key: string,
+      params: Record<string, unknown> = {},
+      options?: TestHarnessPerformActionOptions,
+    ) {
       const handler = actionHandlers.get(key);
       if (!handler) throw new Error(`No action handler registered for '${key}'`);
-      return await handler(params) as T;
+      const context = actionContextFor(params, options);
+      return await handler(paramsWithHostCompanyScope(params, context, options), context) as T;
     },
     async executeTool<T = ToolResult>(name: string, params: unknown, runCtx: Partial<ToolRunContext> = {}) {
       const handler = toolHandlers.get(name);
diff --git a/packages/plugins/sdk/src/types.ts b/packages/plugins/sdk/src/types.ts
index 456f4a9e..90af99b4 100644
--- a/packages/plugins/sdk/src/types.ts
+++ b/packages/plugins/sdk/src/types.ts
@@ -46,6 +46,7 @@ import type {
   PrincipalPermissionGrant,
   PrincipalType,
 } from "@paperclipai/shared";
+import type { PluginPerformActionContext } from "./protocol.js";
 
 // ---------------------------------------------------------------------------
 // Re-exports from @paperclipai/shared (plugin authors import from one place)
@@ -957,9 +958,12 @@ export interface PluginActionsClient {
    * Register a handler for a plugin-defined action key.
    *
    * @param key - Stable string identifier for this action (e.g. `"resync"`)
-   * @param handler - Async function that receives action params and returns a result
+   * @param handler - Async function that receives action params plus immutable host actor context and returns a result
    */
-  register(key: string, handler: (params: Record<string, unknown>) => Promise<unknown>): void;
+  register(
+    key: string,
+    handler: (params: Record<string, unknown>, context: PluginPerformActionContext) => Promise<unknown>,
+  ): void;
 }
 
 /**
diff --git a/packages/plugins/sdk/src/ui/types.ts b/packages/plugins/sdk/src/ui/types.ts
index 8923803e..10478216 100644
--- a/packages/plugins/sdk/src/ui/types.ts
+++ b/packages/plugins/sdk/src/ui/types.ts
@@ -54,6 +54,7 @@ export type {
  * Error codes:
  * - `WORKER_UNAVAILABLE` — plugin worker is not running
  * - `CAPABILITY_DENIED` — plugin lacks the required capability
+ * - `INVOCATION_SCOPE_DENIED` — plugin call escaped the invocation company scope
  * - `WORKER_ERROR` — worker returned an error from its handler
  * - `TIMEOUT` — worker did not respond within the configured timeout
  * - `UNKNOWN` — unexpected bridge-level failure
diff --git a/packages/plugins/sdk/src/worker-rpc-host.ts b/packages/plugins/sdk/src/worker-rpc-host.ts
index a50b6d8f..a135d1f0 100644
--- a/packages/plugins/sdk/src/worker-rpc-host.ts
+++ b/packages/plugins/sdk/src/worker-rpc-host.ts
@@ -78,6 +78,8 @@ import type {
   RunJobParams,
   GetDataParams,
   PerformActionParams,
+  PluginPerformActionActorContext,
+  PluginPerformActionContext,
   ExecuteToolParams,
   PluginEnvironmentAcquireLeaseParams,
   PluginEnvironmentDestroyLeaseParams,
@@ -289,7 +291,10 @@ export function startWorkerRpcHost(options: WorkerRpcHostOptions): WorkerRpcHost
   const jobHandlers = new Map<string, (job: PluginJobContext) => Promise<void>>();
   const launcherRegistrations = new Map<string, PluginLauncherRegistration>();
   const dataHandlers = new Map<string, (params: Record<string, unknown>) => Promise<unknown>>();
-  const actionHandlers = new Map<string, (params: Record<string, unknown>) => Promise<unknown>>();
+  const actionHandlers = new Map<
+    string,
+    (params: Record<string, unknown>, context: PluginPerformActionContext) => Promise<unknown>
+  >();
   const toolHandlers = new Map<string, {
     declaration: Pick<import("@paperclipai/shared").PluginToolDeclaration, "displayName" | "description" | "parametersSchema">;
     fn: (params: unknown, runCtx: ToolRunContext) => Promise<ToolResult>;
@@ -1184,7 +1189,10 @@ export function startWorkerRpcHost(options: WorkerRpcHostOptions): WorkerRpcHost
       },
 
       actions: {
-        register(key: string, handler: (params: Record<string, unknown>) => Promise<unknown>): void {
+        register(
+          key: string,
+          handler: (params: Record<string, unknown>, context: PluginPerformActionContext) => Promise<unknown>,
+        ): void {
           actionHandlers.set(key, handler);
         },
       },
@@ -1514,16 +1522,44 @@ export function startWorkerRpcHost(options: WorkerRpcHostOptions): WorkerRpcHost
     });
   }
 
+  function stringOrNull(value: unknown): string | null {
+    return typeof value === "string" && value.trim().length > 0 ? value.trim() : null;
+  }
+
+  function actorTypeOrSystem(value: unknown): PluginPerformActionActorContext["type"] {
+    return value === "user" || value === "agent" || value === "system" ? value : "system";
+  }
+
+  function actionContextFromParams(params: PerformActionParams): PluginPerformActionContext {
+    const rawActor = params.actorContext && typeof params.actorContext === "object"
+      ? params.actorContext
+      : null;
+    const actor = Object.freeze({
+      type: actorTypeOrSystem(rawActor?.type),
+      userId: stringOrNull(rawActor?.userId),
+      agentId: stringOrNull(rawActor?.agentId),
+      runId: stringOrNull(rawActor?.runId),
+      companyId: stringOrNull(rawActor?.companyId),
+    });
+    return Object.freeze({
+      actor,
+      companyId: actor.companyId,
+    });
+  }
+
   async function handlePerformAction(params: PerformActionParams): Promise<unknown> {
     const handler = actionHandlers.get(params.key);
     if (!handler) {
       throw new Error(`No action handler registered for key "${params.key}"`);
     }
-    return handler({
-      ...params.params,
-      ...(params.companyId === undefined ? {} : { companyId: params.companyId }),
-      ...(params.renderEnvironment === undefined ? {} : { renderEnvironment: params.renderEnvironment }),
-    });
+    return handler(
+      {
+        ...params.params,
+        ...(params.companyId === undefined ? {} : { companyId: params.companyId }),
+        ...(params.renderEnvironment === undefined ? {} : { renderEnvironment: params.renderEnvironment }),
+      },
+      actionContextFromParams(params),
+    );
   }
 
   async function handleExecuteTool(params: ExecuteToolParams): Promise<ToolResult> {
diff --git a/packages/plugins/sdk/tests/host-client-factory.test.ts b/packages/plugins/sdk/tests/host-client-factory.test.ts
index 8cded9c8..eb79043e 100644
--- a/packages/plugins/sdk/tests/host-client-factory.test.ts
+++ b/packages/plugins/sdk/tests/host-client-factory.test.ts
@@ -6,6 +6,7 @@ import {
   createHostClientHandlers,
   InvocationScopeDeniedError,
 } from "../src/host-client-factory.js";
+import { PLUGIN_RPC_ERROR_CODES } from "../src/protocol.js";
 
 describe("createHostClientHandlers invocation company scope", () => {
   it("rejects company-scoped host calls outside the current invocation company", async () => {
@@ -28,6 +29,14 @@ describe("createHostClientHandlers invocation company scope", () => {
         { invocationScope: { companyId: "company-a" } },
       ),
     ).rejects.toBeInstanceOf(InvocationScopeDeniedError);
+    await expect(
+      handlers["projects.list"](
+        { companyId: "company-b" },
+        { invocationScope: { companyId: "company-a" } },
+      ),
+    ).rejects.toMatchObject({
+      code: PLUGIN_RPC_ERROR_CODES.INVOCATION_SCOPE_DENIED,
+    });
     expect(projectsList).not.toHaveBeenCalled();
   });
 
diff --git a/packages/plugins/sdk/tests/testing-actions.test.ts b/packages/plugins/sdk/tests/testing-actions.test.ts
new file mode 100644
index 00000000..ab0026b2
--- /dev/null
+++ b/packages/plugins/sdk/tests/testing-actions.test.ts
@@ -0,0 +1,74 @@
+import { describe, expect, it } from "vitest";
+
+import { createTestHarness } from "../src/testing.js";
+import type { PaperclipPluginManifestV1 } from "../src/types.js";
+
+const manifest = {
+  id: "paperclip.test-actions",
+  apiVersion: 1,
+  version: "1.0.0",
+  displayName: "Test Actions",
+  description: "Test plugin",
+  author: "Paperclip",
+  categories: ["automation"],
+  capabilities: [],
+  entrypoints: {},
+} satisfies PaperclipPluginManifestV1;
+
+describe("createTestHarness action context", () => {
+  it("passes immutable authenticated actor context and overrides caller company scope", async () => {
+    const harness = createTestHarness({ manifest });
+
+    harness.ctx.actions.register("inspect", async (params, context) => ({
+      paramsCompanyId: params.companyId,
+      actor: context.actor,
+      companyId: context.companyId,
+      contextFrozen: Object.isFrozen(context),
+      actorFrozen: Object.isFrozen(context.actor),
+    }));
+
+    const result = await harness.performAction<{
+      paramsCompanyId: unknown;
+      actor: {
+        type: string;
+        userId: string | null;
+        agentId: string | null;
+        runId: string | null;
+        companyId: string | null;
+      };
+      companyId: string | null;
+      contextFrozen: boolean;
+      actorFrozen: boolean;
+    }>(
+      "inspect",
+      { companyId: "spoofed-company", value: true },
+      {
+        companyId: "host-company",
+        actor: {
+          type: "user",
+          userId: "board-user-1",
+          runId: "run-1",
+        },
+      },
+    );
+
+    expect(result.paramsCompanyId).toBe("host-company");
+    expect(result.companyId).toBe("host-company");
+    expect(result.actor).toEqual({
+      type: "user",
+      userId: "board-user-1",
+      agentId: null,
+      runId: "run-1",
+      companyId: "host-company",
+    });
+    expect(result.contextFrozen).toBe(true);
+    expect(result.actorFrozen).toBe(true);
+  });
+
+  it("keeps existing one-argument action handlers compatible", async () => {
+    const harness = createTestHarness({ manifest });
+    harness.ctx.actions.register("legacy", async (params) => ({ ok: params.ok }));
+
+    await expect(harness.performAction("legacy", { ok: true })).resolves.toEqual({ ok: true });
+  });
+});
diff --git a/packages/plugins/sdk/tests/worker-rpc-host.test.ts b/packages/plugins/sdk/tests/worker-rpc-host.test.ts
index b7f15781..d41aa863 100644
--- a/packages/plugins/sdk/tests/worker-rpc-host.test.ts
+++ b/packages/plugins/sdk/tests/worker-rpc-host.test.ts
@@ -71,6 +71,90 @@ describe("isWorkerEntrypoint", () => {
   });
 });
 
+describe("worker performAction context", () => {
+  it("does not derive context companyId from caller params without host actor context", async () => {
+    const hostToWorker = new PassThrough();
+    const workerToHost = new PassThrough();
+    const hostReadline = createInterface({ input: workerToHost });
+    const pending = new Map<string, (response: JsonRpcResponse) => void>();
+    let nextRequestId = 1;
+    const plugin = definePlugin({
+      async setup(ctx) {
+        ctx.actions.register("inspect", async (params, context) => ({
+          paramsCompanyId: params.companyId,
+          actor: context.actor,
+          companyId: context.companyId,
+        }));
+      },
+    });
+    const worker = startWorkerRpcHost({
+      plugin,
+      stdin: hostToWorker,
+      stdout: workerToHost,
+    });
+
+    function callWorker(method: string, params: unknown) {
+      const id = `host-${nextRequestId++}`;
+      const result = new Promise<unknown>((resolve, reject) => {
+        pending.set(id, (response) => {
+          if ("error" in response && response.error) {
+            reject(new Error(response.error.message));
+            return;
+          }
+          resolve((response as { result?: unknown }).result);
+        });
+      });
+      hostToWorker.write(serializeMessage(createRequest(method, params, id)));
+      return result;
+    }
+
+    hostReadline.on("line", (line) => {
+      const message = parseMessage(line);
+      if (!isJsonRpcResponse(message)) return;
+      pending.get(String(message.id))?.(message);
+      pending.delete(String(message.id));
+    });
+
+    try {
+      await expect(callWorker("initialize", {
+        manifest: {
+          id: "paperclip.test-worker-context",
+          apiVersion: 1,
+          version: "1.0.0",
+          displayName: "Worker Context Test",
+          description: "Test plugin",
+          author: "Paperclip",
+          categories: ["automation"],
+          capabilities: [],
+          entrypoints: {},
+        },
+        config: {},
+        databaseNamespace: null,
+      })).resolves.toMatchObject({ ok: true });
+
+      await expect(callWorker("performAction", {
+        key: "inspect",
+        params: { companyId: "spoofed-company" },
+      })).resolves.toEqual({
+        paramsCompanyId: "spoofed-company",
+        actor: {
+          type: "system",
+          userId: null,
+          agentId: null,
+          runId: null,
+          companyId: null,
+        },
+        companyId: null,
+      });
+    } finally {
+      worker.stop();
+      hostReadline.close();
+      hostToWorker.destroy();
+      workerToHost.destroy();
+    }
+  });
+});
+
 describe("worker invocation scope propagation", () => {
   it("keeps overlapping company scopes local to each getData invocation", async () => {
     const hostToWorker = new PassThrough();
diff --git a/packages/shared/src/constants.ts b/packages/shared/src/constants.ts
index b0c92acb..c102fa73 100644
--- a/packages/shared/src/constants.ts
+++ b/packages/shared/src/constants.ts
@@ -1095,6 +1095,7 @@ export type PluginEventType = (typeof PLUGIN_EVENT_TYPES)[number];
 export const PLUGIN_BRIDGE_ERROR_CODES = [
   "WORKER_UNAVAILABLE",
   "CAPABILITY_DENIED",
+  "INVOCATION_SCOPE_DENIED",
   "WORKER_ERROR",
   "TIMEOUT",
   "UNKNOWN",
diff --git a/server/src/__tests__/fixtures/plugin-worker-invocation-scope.cjs b/server/src/__tests__/fixtures/plugin-worker-invocation-scope.cjs
index 6e54689f..9e1f06df 100644
--- a/server/src/__tests__/fixtures/plugin-worker-invocation-scope.cjs
+++ b/server/src/__tests__/fixtures/plugin-worker-invocation-scope.cjs
@@ -68,13 +68,13 @@ rl.on("line", (line) => {
       id: message.id,
       result: {
         ok: true,
-        supportedMethods: ["getData"],
+        supportedMethods: ["getData", "performAction"],
       },
     });
     return;
   }
 
-  if (method === "getData") {
+  if (method === "getData" || method === "performAction") {
     sendNestedHostRequest(message, message.paperclipInvocation?.id);
     return;
   }
diff --git a/server/src/__tests__/issues-service.test.ts b/server/src/__tests__/issues-service.test.ts
index ef328416..150625c3 100644
--- a/server/src/__tests__/issues-service.test.ts
+++ b/server/src/__tests__/issues-service.test.ts
@@ -773,6 +773,8 @@ describeEmbeddedPostgres("issueService.list participantAgentId", () => {
     const normalIssueId = randomUUID();
     const pluginVisibleIssueId = randomUUID();
     const operationIssueId = randomUUID();
+    const typedOperationIssueId = randomUUID();
+    const legacyContentMachineOperationIssueId = randomUUID();
 
     await db.insert(companies).values({
       id: companyId,
@@ -826,12 +828,36 @@ describeEmbeddedPostgres("issueService.list participantAgentId", () => {
         originKind: "plugin:paperclip.missions:operation",
         originId: "mission-alpha:operation-1",
       },
+      {
+        id: typedOperationIssueId,
+        companyId,
+        projectId,
+        title: "Typed plugin operation issue",
+        status: "todo",
+        priority: "medium",
+        assigneeAgentId: agentId,
+        originKind: "plugin:paperclip.missions:operation:evaluation",
+        originId: "mission-alpha:operation-2",
+      },
+      {
+        id: legacyContentMachineOperationIssueId,
+        companyId,
+        projectId,
+        title: "Legacy Content Machine operation issue",
+        status: "todo",
+        priority: "medium",
+        assigneeAgentId: agentId,
+        originKind: "plugin:paperclipai.content-machine:evaluation",
+        originId: "content-machine-operation-1",
+      },
     ]);
 
     const defaultIssueIds = (await svc.list(companyId)).map((issue) => issue.id);
     expect(defaultIssueIds).toContain(normalIssueId);
     expect(defaultIssueIds).toContain(pluginVisibleIssueId);
     expect(defaultIssueIds).not.toContain(operationIssueId);
+    expect(defaultIssueIds).not.toContain(typedOperationIssueId);
+    expect(defaultIssueIds).not.toContain(legacyContentMachineOperationIssueId);
 
     const inboxIssueIds = (await svc.list(companyId, {
       assigneeAgentId: agentId,
@@ -840,17 +866,28 @@ describeEmbeddedPostgres("issueService.list participantAgentId", () => {
     })).map((issue) => issue.id);
     expect(inboxIssueIds).toContain(normalIssueId);
     expect(inboxIssueIds).not.toContain(operationIssueId);
+    expect(inboxIssueIds).not.toContain(typedOperationIssueId);
+    expect(inboxIssueIds).not.toContain(legacyContentMachineOperationIssueId);
 
     await expect(svc.list(companyId, { originKind: "plugin:paperclip.missions:operation" }))
       .resolves.toEqual([expect.objectContaining({ id: operationIssueId })]);
     await expect(svc.list(companyId, { originId: "mission-alpha:operation-1" }))
       .resolves.toEqual([expect.objectContaining({ id: operationIssueId })]);
+    await expect(svc.list(companyId, { originKindPrefix: "plugin:paperclip.missions:operation" }))
+      .resolves.toEqual(expect.arrayContaining([
+        expect.objectContaining({ id: operationIssueId }),
+        expect.objectContaining({ id: typedOperationIssueId }),
+      ]));
 
     const projectIssueIds = (await svc.list(companyId, { projectId })).map((issue) => issue.id);
     expect(projectIssueIds).toContain(operationIssueId);
+    expect(projectIssueIds).toContain(typedOperationIssueId);
+    expect(projectIssueIds).toContain(legacyContentMachineOperationIssueId);
 
     const advancedIssueIds = (await svc.list(companyId, { includePluginOperations: true })).map((issue) => issue.id);
     expect(advancedIssueIds).toContain(operationIssueId);
+    expect(advancedIssueIds).toContain(typedOperationIssueId);
+    expect(advancedIssueIds).toContain(legacyContentMachineOperationIssueId);
   });
 
   it("excludes plugin operation issues from unread inbox counts", async () => {
diff --git a/server/src/__tests__/plugin-routes-authz.test.ts b/server/src/__tests__/plugin-routes-authz.test.ts
index 52fe1c84..272e20c3 100644
--- a/server/src/__tests__/plugin-routes-authz.test.ts
+++ b/server/src/__tests__/plugin-routes-authz.test.ts
@@ -114,6 +114,17 @@ function boardActor(overrides: Record<string, unknown> = {}) {
   };
 }
 
+function agentActor(overrides: Record<string, unknown> = {}) {
+  return {
+    type: "agent",
+    agentId: agentA,
+    companyId: companyA,
+    runId: runA,
+    source: "agent_jwt",
+    ...overrides,
+  };
+}
+
 function readyPlugin() {
   mockRegistry.getById.mockResolvedValue({
     id: pluginId,
@@ -656,10 +667,160 @@ describe.sequential("plugin tool and bridge authz", () => {
     expect(call).toHaveBeenCalledWith(pluginId, "performAction", {
       key: "sync",
       params: {},
+      actorContext: {
+        type: "user",
+        userId: "admin-1",
+        agentId: null,
+        runId: null,
+        companyId: null,
+      },
       renderEnvironment: null,
     });
   });
 
+  it("passes authenticated actor context and overrides spoofed company scope for plugin actions", async () => {
+    readyPlugin();
+    const call = vi.fn().mockResolvedValue({ ok: true });
+    const { app } = await createApp(boardActor({ runId: runA }), {}, {
+      bridgeDeps: {
+        workerManager: { call },
+      },
+    });
+
+    const res = await request(app)
+      .post(`/api/plugins/${pluginId}/actions/sync`)
+      .send({
+        companyId: companyA,
+        params: {
+          companyId: companyB,
+          reviewerUserId: "spoofed-user",
+        },
+      });
+
+    expect(res.status).toBe(200);
+    expect(call).toHaveBeenCalledWith(pluginId, "performAction", {
+      key: "sync",
+      params: {
+        companyId: companyA,
+        reviewerUserId: "spoofed-user",
+      },
+      actorContext: {
+        type: "user",
+        userId: "user-1",
+        agentId: null,
+        runId: runA,
+        companyId: companyA,
+      },
+      renderEnvironment: null,
+    });
+  });
+
+  it("uses null for board actor userId when no authenticated user id is present", async () => {
+    readyPlugin();
+    const call = vi.fn().mockResolvedValue({ ok: true });
+    const { app } = await createApp(boardActor({ userId: undefined }), {}, {
+      bridgeDeps: {
+        workerManager: { call },
+      },
+    });
+
+    const res = await request(app)
+      .post(`/api/plugins/${pluginId}/actions/sync`)
+      .send({ companyId: companyA });
+
+    expect(res.status).toBe(200);
+    expect(call).toHaveBeenCalledWith(pluginId, "performAction", expect.objectContaining({
+      actorContext: expect.objectContaining({
+        type: "user",
+        userId: null,
+        companyId: companyA,
+      }),
+    }));
+  });
+
+  it("allows agent-scoped plugin actions with authenticated actor context", async () => {
+    readyPlugin();
+    const call = vi.fn().mockResolvedValue({ ok: true });
+    const { app } = await createApp(agentActor(), {}, {
+      bridgeDeps: {
+        workerManager: { call },
+      },
+    });
+
+    const res = await request(app)
+      .post(`/api/plugins/${pluginId}/actions/sync`)
+      .send({
+        companyId: companyA,
+        params: {
+          companyId: companyB,
+          reviewerAgentId: "spoofed-agent",
+        },
+      });
+
+    expect(res.status).toBe(200);
+    expect(call).toHaveBeenCalledWith(pluginId, "performAction", {
+      key: "sync",
+      params: {
+        companyId: companyA,
+        reviewerAgentId: "spoofed-agent",
+      },
+      actorContext: {
+        type: "agent",
+        userId: null,
+        agentId: agentA,
+        runId: runA,
+        companyId: companyA,
+      },
+      renderEnvironment: null,
+    });
+
+    call.mockClear();
+    const legacyRes = await request(app)
+      .post(`/api/plugins/${pluginId}/bridge/action`)
+      .send({
+        key: "sync",
+        companyId: companyA,
+        params: {
+          companyId: companyB,
+          reviewerAgentId: "spoofed-agent",
+        },
+      });
+
+    expect(legacyRes.status).toBe(200);
+    expect(call).toHaveBeenCalledWith(pluginId, "performAction", {
+      key: "sync",
+      params: {
+        companyId: companyA,
+        reviewerAgentId: "spoofed-agent",
+      },
+      actorContext: {
+        type: "agent",
+        userId: null,
+        agentId: agentA,
+        runId: runA,
+        companyId: companyA,
+      },
+      renderEnvironment: null,
+    });
+  });
+
+  it("rejects agent plugin actions outside the authenticated company scope", async () => {
+    readyPlugin();
+    const call = vi.fn().mockResolvedValue({ ok: true });
+    const { app } = await createApp(agentActor(), {}, {
+      bridgeDeps: {
+        workerManager: { call },
+      },
+    });
+
+    const res = await request(app)
+      .post(`/api/plugins/${pluginId}/actions/sync`)
+      .send({ companyId: companyB });
+
+    expect(res.status).toBe(403);
+    expect(call).not.toHaveBeenCalled();
+  });
+
   it("attaches worker bridge errors to the HTTP logger context", async () => {
     readyPlugin();
     const call = vi.fn().mockRejectedValue(new Error("missing source_objects column"));
diff --git a/server/src/__tests__/plugin-worker-manager.test.ts b/server/src/__tests__/plugin-worker-manager.test.ts
index 626ed448..8d2d7194 100644
--- a/server/src/__tests__/plugin-worker-manager.test.ts
+++ b/server/src/__tests__/plugin-worker-manager.test.ts
@@ -186,6 +186,58 @@ describe("plugin-worker-manager stderr failure context", () => {
     }
   });
 
+  it("passes performAction invocation scope to nested worker host calls", async () => {
+    const companiesGet = vi.fn(async (
+      params: { companyId: string },
+      context?: { invocationScope?: { companyId?: string | null } | null },
+    ) => ({
+      id: params.companyId,
+      scopedCompanyId: context?.invocationScope?.companyId ?? null,
+    }));
+    const handle = createPluginWorkerHandle("test.plugin", {
+      entrypointPath: INVOCATION_SCOPE_WORKER_ENTRYPOINT,
+      manifest: TEST_MANIFEST,
+      config: {},
+      instanceInfo: {
+        instanceId: "instance-1",
+        hostVersion: "1.0.0",
+      },
+      apiVersion: 1,
+      hostHandlers: {
+        "companies.get": companiesGet as never,
+      },
+    });
+
+    try {
+      await handle.start();
+
+      await expect(handle.call("performAction", {
+        key: "probe",
+        params: {
+          mode: "echo",
+          requestedCompanyId: "company-a",
+        },
+        actorContext: {
+          type: "agent",
+          userId: null,
+          agentId: "agent-1",
+          runId: "run-1",
+          companyId: "company-a",
+        },
+        renderEnvironment: null,
+      })).resolves.toEqual({
+        id: "company-a",
+        scopedCompanyId: "company-a",
+      });
+      expect(companiesGet).toHaveBeenCalledWith(
+        { companyId: "company-a" },
+        { invocationScope: { companyId: "company-a" } },
+      );
+    } finally {
+      await handle.stop().catch(() => undefined);
+    }
+  });
+
   it("passes echoed invocation scope to worker-to-host handlers", async () => {
     const companiesGet = vi.fn(async () => ({ id: "company-1" }));
     const handle = createPluginWorkerHandle("test.plugin", {
@@ -223,6 +275,104 @@ describe("plugin-worker-manager stderr failure context", () => {
     }
   });
 
+  it("rejects performAction nested host calls that omit the invocation id", async () => {
+    const handlers = createHostClientHandlers({
+      pluginId: "test.plugin",
+      capabilities: ["companies.read"],
+      services: {
+        companies: {
+          list: vi.fn(async () => []),
+          get: vi.fn(async (params: { companyId: string }) => ({ id: params.companyId })),
+        },
+      } as unknown as HostServices,
+    });
+    const handle = createPluginWorkerHandle("test.plugin", {
+      entrypointPath: INVOCATION_SCOPE_WORKER_ENTRYPOINT,
+      manifest: TEST_MANIFEST,
+      config: {},
+      instanceInfo: {
+        instanceId: "instance-1",
+        hostVersion: "1.0.0",
+      },
+      apiVersion: 1,
+      hostHandlers: handlers,
+    });
+
+    try {
+      await handle.start();
+
+      await expect(handle.call("performAction", {
+        key: "probe",
+        params: {
+          requestedCompanyId: "company-b",
+        },
+        actorContext: {
+          type: "agent",
+          userId: null,
+          agentId: "agent-1",
+          runId: "run-1",
+          companyId: "company-a",
+        },
+        renderEnvironment: null,
+      })).rejects.toMatchObject({
+        code: PLUGIN_RPC_ERROR_CODES.INVOCATION_SCOPE_DENIED,
+        message: expect.stringContaining("unknown invocation scope"),
+      });
+    } finally {
+      await handle.stop().catch(() => undefined);
+    }
+  });
+
+  it("rejects nested worker host calls that forge an unknown invocation id", async () => {
+    const companiesGet = vi.fn(async (params: { companyId: string }) => ({ id: params.companyId }));
+    const handlers = createHostClientHandlers({
+      pluginId: "test.plugin",
+      capabilities: ["companies.read"],
+      services: {
+        companies: {
+          get: companiesGet,
+        },
+      } as unknown as HostServices,
+    });
+    const handle = createPluginWorkerHandle("test.plugin", {
+      entrypointPath: INVOCATION_SCOPE_WORKER_ENTRYPOINT,
+      manifest: TEST_MANIFEST,
+      config: {},
+      instanceInfo: {
+        instanceId: "instance-1",
+        hostVersion: "1.0.0",
+      },
+      apiVersion: 1,
+      hostHandlers: handlers,
+    });
+
+    try {
+      await handle.start();
+
+      await expect(handle.call("performAction", {
+        key: "probe",
+        params: {
+          mode: "unknown",
+          requestedCompanyId: "company-a",
+        },
+        actorContext: {
+          type: "agent",
+          userId: null,
+          agentId: "agent-1",
+          runId: "run-1",
+          companyId: "company-a",
+        },
+        renderEnvironment: null,
+      })).rejects.toMatchObject({
+        code: PLUGIN_RPC_ERROR_CODES.INVOCATION_SCOPE_DENIED,
+        message: expect.stringContaining("unknown invocation scope"),
+      });
+      expect(companiesGet).not.toHaveBeenCalled();
+    } finally {
+      await handle.stop().catch(() => undefined);
+    }
+  });
+
   it("rejects missing or unknown invocation ids while a company invocation is active", async () => {
     const companiesGet = vi.fn(async () => ({ id: "company-2" }));
     const hostHandlers = createHostClientHandlers({
@@ -258,7 +408,7 @@ describe("plugin-worker-manager stderr failure context", () => {
             requestedCompanyId: "company-2",
           },
         } as HostToWorkerMethods["getData"][0])).rejects.toMatchObject({
-          code: PLUGIN_RPC_ERROR_CODES.CAPABILITY_DENIED,
+          code: PLUGIN_RPC_ERROR_CODES.INVOCATION_SCOPE_DENIED,
         });
       }
 
diff --git a/server/src/routes/plugins.ts b/server/src/routes/plugins.ts
index 741fa151..d572c90d 100644
--- a/server/src/routes/plugins.ts
+++ b/server/src/routes/plugins.ts
@@ -55,7 +55,7 @@ import type { PluginJobStore } from "../services/plugin-job-store.js";
 import type { PluginWorkerManager } from "../services/plugin-worker-manager.js";
 import type { PluginStreamBus } from "../services/plugin-stream-bus.js";
 import type { PluginToolDispatcher } from "../services/plugin-tool-dispatcher.js";
-import type { ToolRunContext } from "@paperclipai/plugin-sdk";
+import type { PluginPerformActionActorContext, ToolRunContext } from "@paperclipai/plugin-sdk";
 import { JsonRpcCallError, PLUGIN_RPC_ERROR_CODES } from "@paperclipai/plugin-sdk";
 import {
   assertAuthenticated,
@@ -572,6 +572,43 @@ export function pluginRoutes(
     return companyId;
   }
 
+  function performActionActorContext(req: Request, companyId: string | undefined): PluginPerformActionActorContext {
+    const scopedCompanyId = companyId ?? null;
+    if (req.actor.type === "agent") {
+      return {
+        type: "agent",
+        userId: null,
+        agentId: req.actor.agentId ?? null,
+        runId: req.actor.runId ?? null,
+        companyId: scopedCompanyId,
+      };
+    }
+    if (req.actor.type === "board") {
+      return {
+        type: "user",
+        userId: req.actor.userId ?? null,
+        agentId: null,
+        runId: req.actor.runId ?? null,
+        companyId: scopedCompanyId,
+      };
+    }
+    return {
+      type: "system",
+      userId: null,
+      agentId: null,
+      runId: req.actor.runId ?? null,
+      companyId: scopedCompanyId,
+    };
+  }
+
+  function actionParamsWithAuthorizedCompanyScope(
+    params: Record<string, unknown> | undefined,
+    companyId: string | undefined,
+  ): Record<string, unknown> {
+    const base = params ?? {};
+    return companyId === undefined ? base : { ...base, companyId };
+  }
+
   async function validateToolRunContextScope(runContext: ToolRunContext): Promise<string | null> {
     const [agent] = await db
       .select({ companyId: agents.companyId })
@@ -984,6 +1021,12 @@ export function pluginRoutes(
             message: err.message,
             details: err.data,
           };
+        case PLUGIN_RPC_ERROR_CODES.INVOCATION_SCOPE_DENIED:
+          return {
+            code: "INVOCATION_SCOPE_DENIED",
+            message: err.message,
+            details: err.data,
+          };
         case PLUGIN_RPC_ERROR_CODES.TIMEOUT:
           return {
             code: "TIMEOUT",
@@ -1171,7 +1214,7 @@ export function pluginRoutes(
    * @see PLUGIN_SPEC.md §19.7 — Error Propagation Through The Bridge
    */
   router.post("/plugins/:pluginId/bridge/action", async (req, res) => {
-    assertBoardOrgAccess(req);
+    assertAuthenticated(req);
 
     if (!bridgeDeps) {
       res.status(501).json({ error: "Plugin bridge is not enabled" });
@@ -1217,8 +1260,8 @@ export function pluginRoutes(
         "performAction",
         {
           key: body.key,
-          ...(companyId ? { companyId } : {}),
-          params: body.params ?? {},
+          params: actionParamsWithAuthorizedCompanyScope(body.params, companyId),
+          actorContext: performActionActorContext(req, companyId),
           renderEnvironment: body.renderEnvironment ?? null,
         },
       );
@@ -1355,7 +1398,7 @@ export function pluginRoutes(
    * @see PLUGIN_SPEC.md §19.7 — Error Propagation Through The Bridge
    */
   router.post("/plugins/:pluginId/actions/:key", async (req, res) => {
-    assertBoardOrgAccess(req);
+    assertAuthenticated(req);
 
     if (!bridgeDeps) {
       res.status(501).json({ error: "Plugin bridge is not enabled" });
@@ -1401,8 +1444,8 @@ export function pluginRoutes(
         "performAction",
         {
           key,
-          ...(companyId ? { companyId } : {}),
-          params: body?.params ?? {},
+          params: actionParamsWithAuthorizedCompanyScope(body?.params, companyId),
+          actorContext: performActionActorContext(req, companyId),
           renderEnvironment: body?.renderEnvironment ?? null,
         },
       );
@@ -1606,7 +1649,10 @@ export function pluginRoutes(
     } catch (err) {
       const status = typeof (err as { status?: unknown }).status === "number"
         ? (err as { status: number }).status
-        : err instanceof JsonRpcCallError && err.code === PLUGIN_RPC_ERROR_CODES.CAPABILITY_DENIED
+        : err instanceof JsonRpcCallError && (
+          err.code === PLUGIN_RPC_ERROR_CODES.CAPABILITY_DENIED ||
+          err.code === PLUGIN_RPC_ERROR_CODES.INVOCATION_SCOPE_DENIED
+        )
           ? 403
           : err instanceof JsonRpcCallError && err.code === PLUGIN_RPC_ERROR_CODES.METHOD_NOT_IMPLEMENTED
             ? 501
diff --git a/server/src/services/issues.ts b/server/src/services/issues.ts
index 0ab88d3e..a61d7f2b 100644
--- a/server/src/services/issues.ts
+++ b/server/src/services/issues.ts
@@ -683,14 +683,25 @@ function inboxVisibleForUserCondition(companyId: string, userId: string) {
   `;
 }
 
+const LEGACY_PLUGIN_OPERATION_ORIGIN_KINDS = [
+  "plugin:paperclipai.content-machine:case",
+  "plugin:paperclipai.content-machine:evaluation",
+  "plugin:paperclipai.content-machine:source-sync",
+] as const;
+
 function nonPluginOperationIssueCondition() {
-  return sql<boolean>`NOT (${issues.originKind} LIKE 'plugin:%:operation' OR ${issues.originKind} LIKE 'plugin:%:operation:%')`;
+  return sql<boolean>`NOT (
+    ${issues.originKind} LIKE 'plugin:%:operation'
+    OR ${issues.originKind} LIKE 'plugin:%:operation:%'
+    OR ${inArray(issues.originKind, LEGACY_PLUGIN_OPERATION_ORIGIN_KINDS)}
+  )`;
 }
 
 function shouldIncludePluginOperationIssues(filters: IssueFilters | undefined) {
   return Boolean(
     filters?.includePluginOperations ||
     filters?.originKind ||
+    filters?.originKindPrefix ||
     filters?.originId ||
     filters?.projectId,
   );
diff --git a/server/src/services/plugin-worker-manager.ts b/server/src/services/plugin-worker-manager.ts
index 81f21a91..9847e879 100644
--- a/server/src/services/plugin-worker-manager.ts
+++ b/server/src/services/plugin-worker-manager.ts
@@ -204,6 +204,8 @@ interface PendingRequest {
   timer: ReturnType<typeof setTimeout>;
   /** Timestamp when the request was sent. */
   sentAt: number;
+  /** Active host-owned invocation id attached to this host→worker call. */
+  invocationId?: string;
 }
 
 interface ActiveInvocation {
@@ -435,6 +437,14 @@ export function createPluginWorkerHandle(
     childProcess.stdin.write(serialized);
   }
 
+  function errorCodeForWorkerHostError(err: unknown): number {
+    const code = (err as { code?: unknown } | null)?.code;
+    const pluginErrorCodes: readonly number[] = Object.values(PLUGIN_RPC_ERROR_CODES);
+    return typeof code === "number" && pluginErrorCodes.includes(code)
+      ? code
+      : JSONRPC_ERROR_CODES.INTERNAL_ERROR;
+  }
+
   // -----------------------------------------------------------------------
   // Incoming message handling
   // -----------------------------------------------------------------------
@@ -503,6 +513,11 @@ export function createPluginWorkerHandle(
     const directCompanyId = readNonEmptyString(params.companyId);
     if (directCompanyId) return { companyId: directCompanyId };
 
+    if (method === "performAction" && isRecord(params.actorContext)) {
+      const companyId = readNonEmptyString(params.actorContext.companyId);
+      return companyId ? { companyId } : null;
+    }
+
     if (method === "executeTool" && isRecord(params.runContext)) {
       const companyId = readNonEmptyString(params.runContext.companyId);
       return companyId ? { companyId } : null;
@@ -585,15 +600,12 @@ export function createPluginWorkerHandle(
       });
     } catch (err) {
       const errorMessage = err instanceof Error ? err.message : String(err);
-      const errorCode = typeof (err as { code?: unknown }).code === "number"
-        ? (err as { code: number }).code
-        : JSONRPC_ERROR_CODES.INTERNAL_ERROR;
       log.error({ method, err: errorMessage }, "host handler error");
       try {
         sendMessage(
           createErrorResponse(
             request.id,
-            errorCode,
+            errorCodeForWorkerHostError(err),
             errorMessage,
           ),
         );
@@ -1161,6 +1173,7 @@ export function createPluginWorkerHandle(
         },
         timer,
         sentAt: Date.now(),
+        invocationId: invocation?.id,
       };
 
       pendingRequests.set(id, pending);