diff --git a/tests/tools/brainstorm.test.ts b/tests/tools/brainstorm.test.ts
new file mode 100644
index 0000000..1ca1c0a
--- /dev/null
+++ b/tests/tools/brainstorm.test.ts
@@ -0,0 +1,80 @@
+import { jest, describe, it, expect, beforeEach } from "@jest/globals";
+import type { ConfigChatType, ThreadStateType } from "../../src/types";
+import type { Message } from "telegraf/types";
+
+const mockBuildMessages = jest.fn();
+const mockLlmCall = jest.fn();
+const mockReadConfig = jest.fn();
+
+jest.unstable_mockModule("../../src/helpers/gpt.ts", () => ({
+  buildMessages: (...args: unknown[]) => mockBuildMessages(...args),
+  llmCall: (...args: unknown[]) => mockLlmCall(...args),
+}));
+
+jest.unstable_mockModule("../../src/config.ts", () => ({
+  readConfig: () => mockReadConfig(),
+}));
+
+let mod: typeof import("../../src/tools/brainstorm.ts");
+
+beforeEach(async () => {
+  jest.resetModules();
+  mockBuildMessages.mockReset();
+  mockLlmCall.mockReset();
+  mockReadConfig.mockReset();
+  mod = await import("../../src/tools/brainstorm.ts");
+});
+
+describe("BrainstormClient", () => {
+  it("calls buildMessages and llmCall with prompts", async () => {
+    const cfg: ConfigChatType = {
+      name: "chat",
+      agent_name: "agent",
+      completionParams: {},
+      chatParams: {},
+      toolParams: {
+        brainstorm: { promptBefore: "BEFORE", promptAfter: "AFTER" },
+      },
+    } as ConfigChatType;
+
+    const thread: ThreadStateType = {
+      id: 1,
+      msgs: [{ text: "hi" } as Message.TextMessage],
+      messages: [],
+    } as ThreadStateType;
+
+    mockBuildMessages.mockResolvedValue([{ role: "system" }]);
+    mockLlmCall.mockResolvedValue({
+      res: { choices: [{ message: { content: "RES" } }] },
+    });
+
+    const client = new mod.BrainstormClient(cfg, thread);
+    const res = await client.brainstorm({ systemMessage: "SYS" });
+
+    expect(mockBuildMessages).toHaveBeenCalledWith(
+      "SYS\n\nBEFORE",
+      thread.messages,
+    );
+    expect(mockLlmCall).toHaveBeenCalled();
+    expect(res.content).toBe("RES\n\nAFTER");
+  });
+
+  it("options_string formats text", () => {
+    const client = new mod.BrainstormClient(
+      {} as ConfigChatType,
+      { id: 1, msgs: [], messages: [] } as ThreadStateType,
+    );
+    expect(client.options_string('{"systemMessage":"p"}')).toBe(
+      "**Brainstorm:** `p`",
+    );
+    expect(client.options_string("{}" as string)).toBe("{}");
+  });
+
+  it("call returns instance", () => {
+    const client = mod.call(
+      {} as ConfigChatType,
+      { id: 1, msgs: [], messages: [] } as ThreadStateType,
+    );
+    expect(client).toBeInstanceOf(mod.BrainstormClient);
+  });
+});
diff --git a/tests/tools/forget.test.ts b/tests/tools/forget.test.ts
new file mode 100644
index 0000000..6ea0395
--- /dev/null
+++ b/tests/tools/forget.test.ts
@@ -0,0 +1,63 @@
+import { jest, describe, it, expect, beforeEach } from "@jest/globals";
+import type { ConfigChatType, ThreadStateType } from "../../src/types";
+
+const mockForgetHistory = jest.fn();
+const mockLog = jest.fn();
+
+jest.unstable_mockModule("../../src/helpers/history.ts", () => ({
+  forgetHistory: (...args: unknown[]) => mockForgetHistory(...args),
+}));
+
+jest.unstable_mockModule("../../src/helpers.ts", () => ({
+  log: (...args: unknown[]) => mockLog(...args),
+}));
+
+let mod: typeof import("../../src/tools/forget.ts");
+
+beforeEach(async () => {
+  jest.resetModules();
+  mockForgetHistory.mockReset();
+  mockLog.mockReset();
+  mod = await import("../../src/tools/forget.ts");
+});
+
+describe("ForgetClient", () => {
+  const cfg = {} as ConfigChatType;
+  const thread = { id: 2 } as ThreadStateType;
+
+  it("forgets history and logs", async () => {
+    const client = new mod.ForgetClient(cfg, thread);
+    const res = await client.forget({});
+    expect(mockForgetHistory).toHaveBeenCalledWith(2);
+    expect(mockLog).toHaveBeenCalled();
+    expect(res.content).toBe("Forgot history");
+  });
+
+  it("uses custom message", async () => {
+    const client = new mod.ForgetClient(cfg, thread);
+    const res = await client.forget({ message: "Bye" });
+    expect(res.content).toBe("Bye");
+  });
+
+  it("handles errors", async () => {
+    mockForgetHistory.mockImplementation(() => {
+      throw new Error("boom");
+    });
+    const client = new mod.ForgetClient(cfg, thread);
+    const res = await client.forget({});
+    expect(res.content).toContain("boom");
+    expect(mockLog).toHaveBeenCalledWith(
+      expect.objectContaining({ logLevel: "error" }),
+    );
+  });
+
+  it("options_string constant", () => {
+    const client = new mod.ForgetClient(cfg, thread);
+    expect(client.options_string()).toBe("`Clear conversation history:`");
+  });
+
+  it("call returns instance", () => {
+    const client = mod.call(cfg, thread);
+    expect(client).toBeInstanceOf(mod.ForgetClient);
+  });
+});
diff --git a/tests/tools/javascript_interpreter.test.ts b/tests/tools/javascript_interpreter.test.ts
new file mode 100644
index 0000000..d588495
--- /dev/null
+++ b/tests/tools/javascript_interpreter.test.ts
@@ -0,0 +1,36 @@
+import { jest, describe, it, expect, beforeEach } from "@jest/globals";
+import type { ToolResponse } from "../../src/types";
+
+let mod: typeof import("../../src/tools/javascript_interpreter.ts");
+
+beforeEach(async () => {
+  jest.resetModules();
+  mod = await import("../../src/tools/javascript_interpreter.ts");
+});
+
+describe("JavascriptInterpreterClient", () => {
+  it("executes code and returns result", async () => {
+    const client = new mod.JavascriptInterpreterClient();
+    const res = await client.javascript_interpreter({ code: "1+2" });
+    expect(res).toEqual({ content: "3" } as ToolResponse);
+  });
+
+  it("returns error string on exception", async () => {
+    const client = new mod.JavascriptInterpreterClient();
+    const res = await client.javascript_interpreter({
+      code: "throw new Error('x')",
+    });
+    expect(res.content).toContain("Error: Unknown error");
+  });
+
+  it("options_string formats code", () => {
+    const client = new mod.JavascriptInterpreterClient();
+    const formatted = client.options_string('{"code":"2+2"}');
+    expect(formatted).toBe("`Javascript:`\n```js\n2+2\n```");
+  });
+
+  it("call returns instance", () => {
+    const client = mod.call();
+    expect(client).toBeInstanceOf(mod.JavascriptInterpreterClient);
+  });
+});
diff --git a/tests/tools/ssh_command.test.ts b/tests/tools/ssh_command.test.ts
new file mode 100644
index 0000000..9e6d24c
--- /dev/null
+++ b/tests/tools/ssh_command.test.ts
@@ -0,0 +1,116 @@
+import { jest, describe, it, expect, beforeEach } from "@jest/globals";
+import type { ConfigChatType } from "../../src/types";
+
+const mockExec = jest.fn();
+const mockFileSync = jest.fn();
+const mockWriteFileSync = jest.fn();
+
+jest.unstable_mockModule("child_process", () => ({
+  exec: (...args: unknown[]) => mockExec(...args),
+}));
+
+jest.unstable_mockModule("tmp", () => ({
+  fileSync: (...args: unknown[]) => mockFileSync(...args),
+}));
+jest.unstable_mockModule("fs", () => {
+  const real = jest.requireActual("fs");
+  return {
+    __esModule: true,
+    ...real,
+    default: {
+      ...real,
+      writeFileSync: (...args: unknown[]) => mockWriteFileSync(...args),
+    },
+    writeFileSync: (...args: unknown[]) => mockWriteFileSync(...args),
+  };
+});
+let mod: typeof import("../../src/tools/ssh_command.ts");
+
+beforeEach(async () => {
+  jest.resetModules();
+  mockExec.mockReset();
+  mockFileSync.mockReset();
+  mockWriteFileSync.mockReset();
+  mod = await import("../../src/tools/ssh_command.ts");
+});
+
+describe("SshCommandClient", () => {
+  const cfg: ConfigChatType = {
+    name: "chat",
+    agent_name: "agent",
+    completionParams: {},
+    chatParams: {},
+    toolParams: {
+      ssh_command: { user: "u", host: "h", strictHostKeyChecking: true },
+    },
+  } as ConfigChatType;
+
+  it("runs command via ssh", async () => {
+    mockFileSync.mockReturnValue({
+      name: "/tmp/tmp.sh",
+      removeCallback: jest.fn(),
+    });
+    mockExec
+      .mockImplementationOnce((_cmd: string, cb: (e: any) => void) => cb(null))
+      .mockImplementationOnce(
+        (_cmd: string, cb: (e: any, out: string, err: string) => void) =>
+          cb(null, "ok", ""),
+      );
+
+    const client = new mod.SshCommandClient(cfg);
+    const res = await client.ssh_command({ command: "ls" });
+
+    expect(mockWriteFileSync).toHaveBeenCalledWith("/tmp/tmp.sh", "ls");
+    expect(mockExec).toHaveBeenCalledTimes(2);
+    expect(res.content).toBe("```\nok\n```");
+  });
+
+  it("returns exit code when ssh fails", async () => {
+    const remove = jest.fn();
+    mockFileSync.mockReturnValue({
+      name: "/tmp/tmp.sh",
+      removeCallback: remove,
+    });
+    mockExec
+      .mockImplementationOnce((_c: string, cb: (e: any) => void) => cb(null))
+      .mockImplementationOnce(
+        (_c: string, cb: (e: any, out: string, err: string) => void) => {
+          const err = new Error("Command failed: ssh boom");
+          (err as any).code = 1;
+          cb(err, "sout", "serr");
+        },
+      );
+
+    const client = new mod.SshCommandClient(cfg);
+    const res = await client.ssh_command({ command: "do" });
+    expect(res.content).toContain("Exit code: 1");
+    expect(remove).toHaveBeenCalled();
+  });
+
+  it("getUserHost defaults", () => {
+    const client = new mod.SshCommandClient({
+      name: "c",
+      agent_name: "a",
+      completionParams: {},
+      chatParams: {},
+      toolParams: {},
+    } as ConfigChatType);
+    expect(client.getUserHost()).toEqual({
+      user: "root",
+      host: "localhost",
+      strictHostKeyChecking: false,
+    });
+  });
+
+  it("options_string and systemMessage", () => {
+    const client = new mod.SshCommandClient(cfg);
+    const str = client.options_string('{"command":"echo hi"}');
+    expect(str).toContain("`ssh u@h`");
+    expect(str).toContain("echo hi");
+    expect(client.systemMessage()).toContain("u@h");
+  });
+
+  it("call returns instance", () => {
+    expect(mod.call(cfg)).toBeInstanceOf(mod.SshCommandClient);
+  });
+});