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Fix missing before_tool_call hook integration (#6570)
* Fix missing before_tool_call hook integration - Add hook call in handleToolExecutionStart before tool execution begins - Support parameter modification via hookResult.params - Support tool call blocking via hookResult.block with custom blockReason - Fix try/catch logic to properly re-throw blocking errors using __isHookBlocking flag - Maintain tool event consistency by emitting start/end events when blocked - Addresses GitHub issue #6535 (1 of 8 unimplemented hooks now working) Co-Authored-By: Claude Sonnet 4 <noreply@anthropic.com> * Add comprehensive test suite for before_tool_call hook - 9 tests covering all hook scenarios: no hooks, parameter passing, modification, blocking, error handling - Tests tool name normalization and different argument types - Verifies proper error re-throwing and logging behavior - Maintained in fork for regression testing * Fix all issues identified by Greptile code review Address P0/P1/P3 bugs: P0 - Fix parameter mutation crash for non-object args: - Normalize args to objects before passing to hooks (maintains hook contract) - Handle parameter merging safely for both object and non-object args P1 - Add missing internal state updates when blocking tools: - Set toolMetaById metadata like normal flow - Call onAgentEvent callback to maintain consistency - Emit events in same order as normal tool execution P1 - Fix test expectations to match implementation reality: - Non-object args normalized to {} for hook params (not passed as-is) - Add test for safe parameter modification with various arg types - Update mocks to verify state updates when blocking P3 - Replace magic __isHookBlocking property with dedicated ToolBlockedError class: - More robust error handling without property collision risk - Cleaner control flow that's serialization-safe Co-Authored-By: Claude Sonnet 4 <noreply@anthropic.com> --------- Co-authored-by: Claude Sonnet 4 <noreply@anthropic.com>
This commit is contained in:
Ryan Nelson
@@ -0,0 +1,351 @@
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import type { AgentEvent } from "@mariozechner/pi-agent-core";
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import { beforeEach, describe, expect, it, vi } from "vitest";
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import type { EmbeddedPiSubscribeContext } from "./pi-embedded-subscribe.handlers.types.js";
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import { getGlobalHookRunner } from "../plugins/hook-runner-global.js";
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import { handleToolExecutionStart } from "./pi-embedded-subscribe.handlers.tools.js";
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// Mock dependencies
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vi.mock("../plugins/hook-runner-global.js");
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vi.mock("../infra/agent-events.js", () => ({
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emitAgentEvent: vi.fn(),
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}));
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vi.mock("./pi-embedded-helpers.js");
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vi.mock("./pi-embedded-messaging.js");
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vi.mock("./pi-embedded-subscribe.tools.js");
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vi.mock("./pi-embedded-utils.js", () => ({
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inferToolMetaFromArgs: vi.fn(() => undefined),
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}));
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vi.mock("./tool-policy.js", () => ({
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normalizeToolName: vi.fn((name: string) => name.toLowerCase()),
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}));
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const mockGetGlobalHookRunner = vi.mocked(getGlobalHookRunner);
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describe("before_tool_call hook integration", () => {
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let mockContext: EmbeddedPiSubscribeContext;
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let mockHookRunner: any;
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beforeEach(() => {
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// Reset mocks
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vi.clearAllMocks();
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// Mock context
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mockContext = {
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params: {
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runId: "test-run-123",
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session: { key: "test-session" },
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onBlockReplyFlush: vi.fn(),
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onAgentEvent: vi.fn(),
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},
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state: {
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toolMetaById: {
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set: vi.fn(),
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get: vi.fn(),
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has: vi.fn(),
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},
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},
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log: {
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debug: vi.fn(),
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warn: vi.fn(),
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},
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flushBlockReplyBuffer: vi.fn(),
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shouldEmitToolResult: vi.fn().mockReturnValue(true),
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} as any;
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// Mock hook runner
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mockHookRunner = {
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hasHooks: vi.fn(),
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runBeforeToolCall: vi.fn(),
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};
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mockGetGlobalHookRunner.mockReturnValue(mockHookRunner);
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});
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describe("when no hooks are registered", () => {
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beforeEach(() => {
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mockHookRunner.hasHooks.mockReturnValue(false);
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});
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it("should proceed with tool execution normally", async () => {
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const event: AgentEvent & { toolName: string; toolCallId: string; args: unknown } = {
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type: "tool_start",
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toolName: "TestTool",
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toolCallId: "tool-call-123",
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args: { param: "value" },
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};
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// Should not throw
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await expect(handleToolExecutionStart(mockContext, event)).resolves.toBeUndefined();
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// Hook runner should check for hooks but not run them
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expect(mockHookRunner.hasHooks).toHaveBeenCalledWith("before_tool_call");
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expect(mockHookRunner.runBeforeToolCall).not.toHaveBeenCalled();
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});
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});
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describe("when hooks are registered", () => {
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beforeEach(() => {
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mockHookRunner.hasHooks.mockReturnValue(true);
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});
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it("should call the hook with correct parameters", async () => {
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mockHookRunner.runBeforeToolCall.mockResolvedValue(undefined);
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const event: AgentEvent & { toolName: string; toolCallId: string; args: unknown } = {
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type: "tool_start",
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toolName: "TestTool",
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toolCallId: "tool-call-123",
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args: { param: "value" },
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};
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await handleToolExecutionStart(mockContext, event);
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expect(mockHookRunner.runBeforeToolCall).toHaveBeenCalledWith(
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{
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toolName: "testtool", // normalized
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params: { param: "value" },
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},
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{
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toolName: "testtool",
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},
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);
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});
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it("should allow hook to modify parameters", async () => {
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const modifiedParams = { param: "modified_value", newParam: "added" };
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mockHookRunner.runBeforeToolCall.mockResolvedValue({
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params: modifiedParams,
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});
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const event: AgentEvent & { toolName: string; toolCallId: string; args: unknown } = {
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type: "tool_start",
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toolName: "TestTool",
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toolCallId: "tool-call-123",
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args: { param: "value" },
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};
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// The function should complete without error
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await expect(handleToolExecutionStart(mockContext, event)).resolves.toBeUndefined();
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expect(mockHookRunner.runBeforeToolCall).toHaveBeenCalledWith(
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{
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toolName: "testtool",
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params: { param: "value" },
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},
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{
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toolName: "testtool",
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},
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);
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// Hook should be called and parameter modification should work
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expect(mockHookRunner.runBeforeToolCall).toHaveBeenCalled();
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});
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it("should handle parameter modification with non-object args safely", async () => {
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const modifiedParams = { newParam: "replaced" };
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mockHookRunner.runBeforeToolCall.mockResolvedValue({
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params: modifiedParams,
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});
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const testCases = [
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{ args: null, description: "null args" },
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{ args: "string", description: "string args" },
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{ args: 123, description: "number args" },
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{ args: [1, 2, 3], description: "array args" },
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];
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for (const { args, description } of testCases) {
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mockHookRunner.runBeforeToolCall.mockClear();
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const event: AgentEvent & { toolName: string; toolCallId: string; args: unknown } = {
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type: "tool_start",
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toolName: "TestTool",
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toolCallId: `call-${description}`,
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args,
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};
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// Should not crash even with non-object args
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await expect(handleToolExecutionStart(mockContext, event)).resolves.toBeUndefined();
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// Hook should be called with normalized empty params
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expect(mockHookRunner.runBeforeToolCall).toHaveBeenCalledWith(
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{
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toolName: "testtool",
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params: {}, // Non-objects normalized to empty object
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},
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{
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toolName: "testtool",
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},
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);
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}
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});
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it("should block tool call when hook returns block=true", async () => {
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const blockReason = "Tool blocked by security policy";
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const mockResult = {
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block: true,
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blockReason,
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};
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mockHookRunner.runBeforeToolCall.mockResolvedValue(mockResult);
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const event: AgentEvent & { toolName: string; toolCallId: string; args: unknown } = {
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type: "tool_start",
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toolName: "BlockedTool",
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toolCallId: "tool-call-456",
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args: { dangerous: "payload" },
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};
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// Should throw an error with the block reason
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await expect(handleToolExecutionStart(mockContext, event)).rejects.toThrow(blockReason);
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// Should log the block
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expect(mockContext.log.debug).toHaveBeenCalledWith(
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expect.stringContaining("Tool call blocked by plugin hook"),
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);
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expect(mockContext.log.debug).toHaveBeenCalledWith(expect.stringContaining(blockReason));
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// Should update internal state like normal tool flow
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expect(mockContext.state.toolMetaById.set).toHaveBeenCalled();
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expect(mockContext.params.onAgentEvent).toHaveBeenCalledWith({
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stream: "tool",
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data: { phase: "start", name: "blockedtool", toolCallId: "tool-call-456" },
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});
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});
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it("should block tool call with default reason when no blockReason provided", async () => {
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mockHookRunner.runBeforeToolCall.mockResolvedValue({
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block: true,
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// no blockReason
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});
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const event: AgentEvent & { toolName: string; toolCallId: string; args: unknown } = {
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type: "tool_start",
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toolName: "BlockedTool",
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toolCallId: "tool-call-789",
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args: {},
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};
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// Should throw with default message
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await expect(handleToolExecutionStart(mockContext, event)).rejects.toThrow(
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"Tool call blocked by plugin hook",
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);
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});
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it("should handle hook errors gracefully and continue execution", async () => {
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const hookError = new Error("Hook implementation error");
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mockHookRunner.runBeforeToolCall.mockRejectedValue(hookError);
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const event: AgentEvent & { toolName: string; toolCallId: string; args: unknown } = {
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type: "tool_start",
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toolName: "TestTool",
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toolCallId: "tool-call-999",
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args: { param: "value" },
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};
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// Should not throw - hook errors should be caught
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await expect(handleToolExecutionStart(mockContext, event)).resolves.toBeUndefined();
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// Should log the hook error
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expect(mockContext.log.warn).toHaveBeenCalledWith(
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expect.stringContaining("before_tool_call hook failed"),
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);
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expect(mockContext.log.warn).toHaveBeenCalledWith(
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expect.stringContaining("Hook implementation error"),
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);
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});
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it("should re-throw blocking errors even when caught", async () => {
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const blockReason = "Blocked by security";
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mockHookRunner.runBeforeToolCall.mockResolvedValue({
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block: true,
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blockReason,
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});
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const event: AgentEvent & { toolName: string; toolCallId: string; args: unknown } = {
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type: "tool_start",
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toolName: "TestTool",
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toolCallId: "tool-call-000",
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args: {},
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};
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// The blocking error should still be thrown
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await expect(handleToolExecutionStart(mockContext, event)).rejects.toThrow(blockReason);
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});
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});
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describe("hook context handling", () => {
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beforeEach(() => {
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mockHookRunner.hasHooks.mockReturnValue(true);
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mockHookRunner.runBeforeToolCall.mockResolvedValue(undefined);
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});
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it("should handle various tool name formats", async () => {
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const testCases = [
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{ input: "ReadFile", expected: "readfile" },
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{ input: "EXEC", expected: "exec" },
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{ input: "bash-command", expected: "bash-command" },
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{ input: " SpacedTool ", expected: " spacedtool " },
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];
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for (const { input, expected } of testCases) {
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mockHookRunner.runBeforeToolCall.mockClear();
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const event: AgentEvent & { toolName: string; toolCallId: string; args: unknown } = {
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type: "tool_start",
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toolName: input,
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toolCallId: `call-${input}`,
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args: {},
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};
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await handleToolExecutionStart(mockContext, event);
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expect(mockHookRunner.runBeforeToolCall).toHaveBeenCalledWith(
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{
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toolName: expected,
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params: {},
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},
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{
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toolName: expected,
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},
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);
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}
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});
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it("should handle different argument types", async () => {
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const testCases = [
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// Non-objects get normalized to {} for hook params (to maintain hook contract)
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{ args: null, expectedParams: {} },
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{ args: undefined, expectedParams: {} },
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{ args: "string", expectedParams: {} },
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{ args: 123, expectedParams: {} },
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{ args: [1, 2, 3], expectedParams: {} }, // arrays are not plain objects
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// Only plain objects are passed through
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{ args: { key: "value" }, expectedParams: { key: "value" } },
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];
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for (const { args, expectedParams } of testCases) {
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mockHookRunner.runBeforeToolCall.mockClear();
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const event: AgentEvent & { toolName: string; toolCallId: string; args: unknown } = {
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type: "tool_start",
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toolName: "TestTool",
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toolCallId: `call-${typeof args}`,
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args,
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};
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await handleToolExecutionStart(mockContext, event);
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expect(mockHookRunner.runBeforeToolCall).toHaveBeenCalledWith(
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{
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toolName: "testtool",
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params: expectedParams,
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},
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{
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toolName: "testtool",
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},
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);
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}
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});
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});
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});
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@@ -1,7 +1,16 @@
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import type { AgentEvent } from "@mariozechner/pi-agent-core";
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import type { EmbeddedPiSubscribeContext } from "./pi-embedded-subscribe.handlers.types.js";
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import { emitAgentEvent } from "../infra/agent-events.js";
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import { getGlobalHookRunner } from "../plugins/hook-runner-global.js";
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import { normalizeTextForComparison } from "./pi-embedded-helpers.js";
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// Dedicated error class for hook blocking to avoid magic property issues
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class ToolBlockedError extends Error {
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constructor(message: string) {
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super(message);
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this.name = "ToolBlockedError";
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}
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}
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import { isMessagingTool, isMessagingToolSendAction } from "./pi-embedded-messaging.js";
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import {
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extractToolErrorMessage,
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@@ -49,7 +58,94 @@ export async function handleToolExecutionStart(
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const rawToolName = String(evt.toolName);
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const toolName = normalizeToolName(rawToolName);
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const toolCallId = String(evt.toolCallId);
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const args = evt.args;
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let args = evt.args;
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// Run before_tool_call hook - allows plugins to modify or block tool calls
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const hookRunner = getGlobalHookRunner();
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if (hookRunner?.hasHooks("before_tool_call")) {
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try {
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// Normalize args to object for hook contract - plugins expect params to be an object
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const normalizedParams =
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args && typeof args === "object" && !Array.isArray(args)
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? (args as Record<string, unknown>)
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: {};
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const hookResult = await hookRunner.runBeforeToolCall(
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{
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toolName,
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params: normalizedParams,
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},
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{
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toolName,
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},
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);
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// Check if hook blocked the tool call
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if (hookResult?.block) {
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const blockReason = hookResult.blockReason || "Tool call blocked by plugin hook";
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// Update internal state to match normal tool execution flow
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const meta = extendExecMeta(toolName, args, inferToolMetaFromArgs(toolName, args));
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ctx.state.toolMetaById.set(toolCallId, meta);
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ctx.log.debug(
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`Tool call blocked by plugin hook: runId=${ctx.params.runId} tool=${toolName} toolCallId=${toolCallId} reason=${blockReason}`,
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);
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// Emit tool start/end events with error to maintain event consistency
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emitAgentEvent({
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runId: ctx.params.runId,
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stream: "tool",
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data: {
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phase: "start",
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name: toolName,
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toolCallId,
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args: args as Record<string, unknown>,
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},
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});
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// Call onAgentEvent callback to match normal flow
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void ctx.params.onAgentEvent?.({
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stream: "tool",
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data: { phase: "start", name: toolName, toolCallId },
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});
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emitAgentEvent({
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runId: ctx.params.runId,
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stream: "tool",
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data: {
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phase: "end",
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name: toolName,
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toolCallId,
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error: blockReason,
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},
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});
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// Throw dedicated error class instead of using magic properties
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throw new ToolBlockedError(blockReason);
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}
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// If hook modified params, update args safely
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if (hookResult?.params) {
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if (args && typeof args === "object" && !Array.isArray(args)) {
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// Safe to merge with existing object args
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args = { ...(args as Record<string, unknown>), ...hookResult.params };
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} else {
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// For non-object args, replace entirely with hook params
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args = hookResult.params;
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}
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}
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} catch (err) {
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// If it's our blocking error, re-throw it
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if (err instanceof ToolBlockedError) {
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throw err;
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}
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// For other hook errors, log but don't block the tool call
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ctx.log.warn(
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`before_tool_call hook failed: runId=${ctx.params.runId} tool=${toolName} toolCallId=${toolCallId} error=${String(err)}`,
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);
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}
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}
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if (toolName === "read") {
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const record = args && typeof args === "object" ? (args as Record<string, unknown>) : {};
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