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fix(FN-834): fix branch prefix drift, add merger branch guard, and fix test OOM

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- Fix resolveBaseBranch to use stored branch name and consistent fusion/ prefix
  for both explicit deps and blockedBy paths (was using kb/ for blockedBy)
- Add main branch checkout verification in merger before squash merge to prevent
  feature code from landing on wrong branch lineage
- Align all branch prefix references from stale kb/ to fusion/ across executor,
  merger, store, and routes
- Fix executor test OOM by mocking merger fully, adding fake timers to retry
  tests, and switching vitest pool to vmThreads
- Update all test assertions to use fusion/ branch prefix

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
gsxdsm
2026-04-04 11:11:59 -07:00
parent d1da9721a1
commit 357086ab61
26 changed files with 1985 additions and 236 deletions
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153
packages/engine/src/agent-heartbeat.ts
View File

@@ -10,7 +10,7 @@
* - onTerminated: Called when an unresponsive agent is terminated
*/
import type { AgentStore, Agent, AgentState } from "@fusion/core";
import type { AgentStore, AgentHeartbeatRun, HeartbeatInvocationSource } from "@fusion/core";
/** Options for HeartbeatMonitor constructor */
export interface HeartbeatMonitorOptions {
@@ -20,12 +20,28 @@ export interface HeartbeatMonitorOptions {
pollIntervalMs?: number;
/** Heartbeat timeout in milliseconds (default: 60000) */
heartbeatTimeoutMs?: number;
/** Max concurrent runs per agent (default: 1) */
maxConcurrentRuns?: number;
/** Callback when an agent misses its heartbeat */
onMissed?: (agentId: string) => void;
/** Callback when an agent recovers after a missed heartbeat */
onRecovered?: (agentId: string) => void;
/** Callback when an unresponsive agent is terminated */
onTerminated?: (agentId: string) => void;
/** Callback when a run starts */
onRunStarted?: (agentId: string, run: AgentHeartbeatRun) => void;
/** Callback when a run completes */
onRunCompleted?: (agentId: string, run: AgentHeartbeatRun) => void;
}
/** Options for waking up an agent */
export interface WakeupOptions {
/** What triggered the wakeup */
source: HeartbeatInvocationSource;
/** Detail about the trigger (manual, ping, scheduler, system) */
triggerDetail?: string;
/** Context snapshot for the run */
contextSnapshot?: Record<string, unknown>;
}
/** Session interface for disposing agent resources */
@@ -41,6 +57,8 @@ interface TrackedAgent {
runId: string;
lastSeen: number; // timestamp from Date.now()
missedHeartbeatReported: boolean;
/** Session ID before this execution started */
sessionIdBefore?: string;
}
/**
@@ -51,11 +69,15 @@ export class HeartbeatMonitor {
private store: AgentStore;
private pollIntervalMs: number;
private heartbeatTimeoutMs: number;
private maxConcurrentRuns: number;
private onMissed?: (agentId: string) => void;
private onRecovered?: (agentId: string) => void;
private onTerminated?: (agentId: string) => void;
private onRunStarted?: (agentId: string, run: AgentHeartbeatRun) => void;
private onRunCompleted?: (agentId: string, run: AgentHeartbeatRun) => void;
private trackedAgents: Map<string, TrackedAgent> = new Map();
private agentStartLocks: Map<string, Promise<unknown>> = new Map();
private pollInterval: NodeJS.Timeout | null = null;
private isRunning = false;
@@ -63,9 +85,12 @@ export class HeartbeatMonitor {
this.store = options.store;
this.pollIntervalMs = options.pollIntervalMs ?? 30000;
this.heartbeatTimeoutMs = options.heartbeatTimeoutMs ?? 60000;
this.maxConcurrentRuns = options.maxConcurrentRuns ?? 1;
this.onMissed = options.onMissed;
this.onRecovered = options.onRecovered;
this.onTerminated = options.onTerminated;
this.onRunStarted = options.onRunStarted;
this.onRunCompleted = options.onRunCompleted;
}
/**
@@ -103,18 +128,20 @@ export class HeartbeatMonitor {
}
/**
* Register an agent for monitoring.
* Register an agent for monitoring with optional session context.
* @param agentId - The agent ID
* @param session - Session with dispose() for cleanup
* @param runId - The heartbeat run ID
* @param sessionIdBefore - Optional session ID from before execution
*/
trackAgent(agentId: string, session: AgentSession, runId: string): void {
trackAgent(agentId: string, session: AgentSession, runId: string, sessionIdBefore?: string): void {
const tracked: TrackedAgent = {
agentId,
session,
runId,
lastSeen: Date.now(),
missedHeartbeatReported: false,
sessionIdBefore,
};
this.trackedAgents.set(agentId, tracked);
@@ -123,6 +150,126 @@ export class HeartbeatMonitor {
void this.store.recordHeartbeat(agentId, "ok", runId);
}
/**
* Serialize run starts per agent to prevent concurrent execution.
* @param agentId - The agent ID
* @param fn - Function to execute with the lock
*/
async withAgentStartLock<T>(agentId: string, fn: () => Promise<T>): Promise<T> {
const existing = this.agentStartLocks.get(agentId) ?? Promise.resolve();
const operation = existing.then(fn, fn);
this.agentStartLocks.set(agentId, operation);
return operation as Promise<T>;
}
/**
* Start a rich heartbeat run with full context capture.
* Creates a structured run record and saves it to the run store.
* @param agentId - The agent ID
* @param options - Wakeup options with trigger context
* @returns The created run
*/
async startRun(agentId: string, options?: WakeupOptions): Promise<AgentHeartbeatRun> {
const run = await this.store.startHeartbeatRun(agentId);
// Enrich with execution context
const enrichedRun: AgentHeartbeatRun = {
...run,
invocationSource: options?.source ?? "on_demand",
triggerDetail: options?.triggerDetail ?? "manual",
contextSnapshot: options?.contextSnapshot,
processPid: process.pid,
};
// Save rich run data
await this.store.saveRun(enrichedRun);
// Transition agent to running state
try {
await this.store.updateAgentState(agentId, "running");
} catch {
// May fail if already in running state - that's ok
}
this.onRunStarted?.(agentId, enrichedRun);
return enrichedRun;
}
/**
* Complete a heartbeat run with results.
* @param agentId - The agent ID
* @param runId - The run ID to complete
* @param result - Execution results
*/
async completeRun(
agentId: string,
runId: string,
result: {
status: "completed" | "failed" | "terminated";
exitCode?: number;
sessionIdAfter?: string;
usageJson?: { inputTokens: number; outputTokens: number; cachedTokens: number };
resultJson?: Record<string, unknown>;
stdoutExcerpt?: string;
stderrExcerpt?: string;
}
): Promise<void> {
// Load and update the run
const run = await this.store.getRunDetail(agentId, runId);
if (!run) return;
const tracked = this.trackedAgents.get(agentId);
const completedRun: AgentHeartbeatRun = {
...run,
endedAt: new Date().toISOString(),
status: result.status,
exitCode: result.exitCode,
sessionIdBefore: tracked?.sessionIdBefore,
sessionIdAfter: result.sessionIdAfter,
usageJson: result.usageJson,
resultJson: result.resultJson,
stdoutExcerpt: result.stdoutExcerpt,
stderrExcerpt: result.stderrExcerpt,
};
await this.store.saveRun(completedRun);
// Update cumulative usage on agent
if (result.usageJson) {
try {
const agent = await this.store.getAgent(agentId);
if (agent) {
await this.store.updateAgent(agentId, {
totalInputTokens: (agent.totalInputTokens ?? 0) + result.usageJson.inputTokens,
totalOutputTokens: (agent.totalOutputTokens ?? 0) + result.usageJson.outputTokens,
});
}
} catch {
// Non-critical, skip
}
}
// Transition agent state based on result
try {
if (result.status === "failed") {
await this.store.updateAgentState(agentId, "error");
await this.store.updateAgent(agentId, { lastError: result.stderrExcerpt ?? "Run failed" });
} else if (result.status === "terminated") {
await this.store.updateAgentState(agentId, "terminated");
} else {
// Completed successfully - back to active
await this.store.updateAgentState(agentId, "active");
}
} catch {
// State transition may fail if already in target state
}
// End the heartbeat run tracking
await this.store.endHeartbeatRun(runId, result.status === "completed" ? "completed" : "terminated");
this.onRunCompleted?.(agentId, completedRun);
}
/**
* Remove an agent from monitoring.
* Does NOT end the heartbeat run - caller's responsibility.

394
packages/engine/src/executor.test.ts
View File

@@ -1,4 +1,4 @@
import { describe, it, expect, vi, beforeEach } from "vitest";
import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
import { AgentSemaphore } from "./concurrency.js";
// Mock external dependencies
@@ -37,13 +37,10 @@ vi.mock("./logger.js", () => {
hybridExecutorLog: createMockLogger(),
};
});
vi.mock("./merger.js", async (importOriginal) => {
const actual = await importOriginal<typeof import("./merger.js")>();
return {
...actual,
findWorktreeUser: vi.fn().mockResolvedValue(null),
};
});
vi.mock("./merger.js", () => ({
aiMergeTask: vi.fn(),
findWorktreeUser: vi.fn().mockResolvedValue(null),
}));
vi.mock("./worktree-names.js", async () => {
const actual = await vi.importActual<typeof import("./worktree-names.js")>("./worktree-names.js");
return {
@@ -62,6 +59,16 @@ vi.mock("node:fs", () => ({
vi.mock("./rate-limit-retry.js", () => ({
withRateLimitRetry: (fn: () => Promise<any>) => fn(),
}));
vi.mock("@mariozechner/pi-coding-agent", () => {
const mockSessionManager = {};
return {
SessionManager: {
create: vi.fn().mockReturnValue(mockSessionManager),
open: vi.fn().mockReturnValue(mockSessionManager),
inMemory: vi.fn().mockReturnValue(mockSessionManager),
},
};
});
import { TaskExecutor, buildExecutionPrompt } from "./executor.js";
import { createKbAgent } from "./pi.js";
@@ -71,8 +78,10 @@ import { findWorktreeUser, aiMergeTask } from "./merger.js";
import { WorktreePool } from "./worktree-pool.js";
import { generateWorktreeName, slugify } from "./worktree-names.js";
import type { Column, Task, TaskDetail } from "@fusion/core";
import { SessionManager } from "@mariozechner/pi-coding-agent";
const mockedCreateHaiAgent = vi.mocked(createKbAgent);
const mockedSessionManager = vi.mocked(SessionManager);
const mockedGenerateWorktreeName = vi.mocked(generateWorktreeName);
const mockedFindWorktreeUser = vi.mocked(findWorktreeUser);
@@ -438,7 +447,7 @@ describe("TaskExecutor worktree naming", () => {
// The worktree path stored should use the generated name, not the task ID
expect(store.updateTask).toHaveBeenCalledWith("FN-030", {
worktree: "/tmp/test/.worktrees/swift-falcon",
branch: "kb/fn-030",
branch: "fusion/fn-030",
});
expect(mockedGenerateWorktreeName).toHaveBeenCalledWith("/tmp/test");
});
@@ -490,7 +499,7 @@ describe("TaskExecutor worktree naming", () => {
// Should use task ID (lowercase) as worktree name
expect(store.updateTask).toHaveBeenCalledWith("FN-042", {
worktree: "/tmp/test/.worktrees/fn-042",
branch: "kb/fn-042",
branch: "fusion/fn-042",
});
// Should NOT call generateWorktreeName when using task-id
expect(mockedGenerateWorktreeName).not.toHaveBeenCalled();
@@ -517,7 +526,7 @@ describe("TaskExecutor worktree naming", () => {
const expectedSlug = slugify("Fix login bug with OAuth");
expect(store.updateTask).toHaveBeenCalledWith("FN-043", {
worktree: `/tmp/test/.worktrees/${expectedSlug}`,
branch: "kb/fn-043",
branch: "fusion/fn-043",
});
expect(mockedGenerateWorktreeName).not.toHaveBeenCalled();
});
@@ -545,7 +554,7 @@ describe("TaskExecutor worktree naming", () => {
const expectedSlug = slugify(taskDescription.slice(0, 60));
expect(store.updateTask).toHaveBeenCalledWith("FN-044", {
worktree: `/tmp/test/.worktrees/${expectedSlug}`,
branch: "kb/fn-044",
branch: "fusion/fn-044",
});
});
@@ -566,7 +575,7 @@ describe("TaskExecutor worktree naming", () => {
// Should use generateWorktreeName for random mode
expect(store.updateTask).toHaveBeenCalledWith("FN-045", {
worktree: "/tmp/test/.worktrees/swift-falcon",
branch: "kb/fn-045",
branch: "fusion/fn-045",
});
expect(mockedGenerateWorktreeName).toHaveBeenCalledWith("/tmp/test");
});
@@ -588,7 +597,7 @@ describe("TaskExecutor worktree naming", () => {
// Should default to random naming
expect(store.updateTask).toHaveBeenCalledWith("FN-046", {
worktree: "/tmp/test/.worktrees/swift-falcon",
branch: "kb/fn-046",
branch: "fusion/fn-046",
});
expect(mockedGenerateWorktreeName).toHaveBeenCalledWith("/tmp/test");
});
@@ -618,7 +627,7 @@ describe("TaskExecutor worktree naming", () => {
// Should acquire from pool, ignoring the task-id naming preference
expect(store.updateTask).toHaveBeenCalledWith("FN-047", {
worktree: "/tmp/test/.worktrees/pooled-warm-wt",
branch: "kb/fn-047",
branch: "fusion/fn-047",
});
// Should NOT call generateWorktreeName when using pooled worktree
expect(mockedGenerateWorktreeName).not.toHaveBeenCalled();
@@ -646,6 +655,7 @@ describe("TaskExecutor worktree recovery", () => {
});
beforeEach(() => {
vi.useFakeTimers();
vi.clearAllMocks();
mockedExistsSync.mockReturnValue(false);
mockedGenerateWorktreeName.mockReturnValue("swift-falcon");
@@ -657,6 +667,10 @@ describe("TaskExecutor worktree recovery", () => {
} as any);
});
afterEach(() => {
vi.useRealTimers();
});
it("creates worktree successfully on first attempt", async () => {
const store = createMockStore();
const executor = new TaskExecutor(store, "/tmp/test");
@@ -735,7 +749,10 @@ describe("TaskExecutor worktree recovery", () => {
const onError = vi.fn();
const executor = new TaskExecutor(store, "/tmp/test", { onError });
await executor.execute(makeTask());
const executePromise = executor.execute(makeTask());
// Advance past all retry delays (100 + 500 + 1000ms)
await vi.advanceTimersByTimeAsync(2000);
await executePromise;
// Should log final failure
expect(store.logEntry).toHaveBeenCalledWith(
@@ -764,19 +781,19 @@ describe("TaskExecutor worktree recovery", () => {
if (command.includes("-b")) {
// First attempt: createWithBranch fails with branch already exists
const error: any = new Error(
"fatal: A branch named 'kb/fn-050' already exists.",
"fatal: A branch named 'fusion/fn-050' already exists.",
);
error.stderr = Buffer.from(
"fatal: A branch named 'kb/fn-050' already exists.",
"fatal: A branch named 'fusion/fn-050' already exists.",
);
throw error;
} else {
// Fallback createFromExistingBranch fails with already used
const error: any = new Error(
"fatal: 'kb/fn-050' is already used by worktree at '/tmp/test/.worktrees/green-sage'",
"fatal: 'fusion/fn-050' is already used by worktree at '/tmp/test/.worktrees/green-sage'",
);
error.stderr = Buffer.from(
"fatal: 'kb/fn-050' is already used by worktree at '/tmp/test/.worktrees/green-sage'",
"fatal: 'fusion/fn-050' is already used by worktree at '/tmp/test/.worktrees/green-sage'",
);
throw error;
}
@@ -803,18 +820,18 @@ describe("TaskExecutor worktree recovery", () => {
}
if (command.includes("-b")) {
const error: any = new Error(
"fatal: A branch named 'kb/fn-050' already exists.",
"fatal: A branch named 'fusion/fn-050' already exists.",
);
error.stderr = Buffer.from(
"fatal: A branch named 'kb/fn-050' already exists.",
"fatal: A branch named 'fusion/fn-050' already exists.",
);
throw error;
} else {
const error: any = new Error(
"fatal: 'kb/fn-050' is already used by worktree at '/tmp/test/.worktrees/green-sage'",
"fatal: 'fusion/fn-050' is already used by worktree at '/tmp/test/.worktrees/green-sage'",
);
error.stderr = Buffer.from(
"fatal: 'kb/fn-050' is already used by worktree at '/tmp/test/.worktrees/green-sage'",
"fatal: 'fusion/fn-050' is already used by worktree at '/tmp/test/.worktrees/green-sage'",
);
throw error;
}
@@ -961,7 +978,7 @@ describe("TaskExecutor worktree recovery", () => {
expect(store.logEntry).toHaveBeenCalledWith(
"FN-050",
expect.stringContaining("Pruned stale worktree metadata"),
"kb/fn-050",
"fusion/fn-050",
);
// Should also call branch -D after prune
expect(mockedExecSync).toHaveBeenCalledWith(
@@ -1063,7 +1080,9 @@ describe("TaskExecutor worktree recovery", () => {
const onError = vi.fn();
const executor = new TaskExecutor(store, "/tmp/test", { onError });
await executor.execute(makeTask());
const executePromise = executor.execute(makeTask());
await vi.advanceTimersByTimeAsync(2000);
await executePromise;
// Should have logged terminal failure for the stale reference
expect(store.logEntry).toHaveBeenCalledWith(
@@ -1278,8 +1297,10 @@ describe("TaskExecutor dependency-based worktree creation", () => {
});
beforeEach(() => {
vi.useRealTimers();
vi.clearAllMocks();
mockedExistsSync.mockReturnValue(false);
mockedFindWorktreeUser.mockResolvedValue(null);
mockedCreateHaiAgent.mockResolvedValue({
session: {
prompt: vi.fn().mockResolvedValue(undefined),
@@ -1294,7 +1315,7 @@ describe("TaskExecutor dependency-based worktree creation", () => {
await executor.execute(makeTask({
id: "FN-060",
baseBranch: "kb/fn-059",
baseBranch: "fusion/fn-059",
}));
// The git worktree add command should include the startPoint
@@ -1302,7 +1323,7 @@ describe("TaskExecutor dependency-based worktree creation", () => {
(c) => typeof c[0] === "string" && (c[0] as string).includes("worktree add"),
);
expect(worktreeAddCalls.length).toBeGreaterThan(0);
expect(worktreeAddCalls[0][0]).toContain("kb/fn-059");
expect(worktreeAddCalls[0][0]).toContain("fusion/fn-059");
});
it("creates worktree from HEAD when baseBranch is not set", async () => {
@@ -1332,12 +1353,12 @@ describe("TaskExecutor dependency-based worktree creation", () => {
await executor.execute(makeTask({
id: "FN-062",
baseBranch: "kb/fn-061",
baseBranch: "fusion/fn-061",
}));
expect(store.logEntry).toHaveBeenCalledWith(
"FN-062",
expect.stringContaining("based on kb/fn-061"),
expect.stringContaining("based on fusion/fn-061"),
);
});
@@ -1367,10 +1388,10 @@ describe("TaskExecutor dependency-based worktree creation", () => {
if (typeof cmd === "string" && cmd.includes("git worktree add") && cmd.includes("-b") && firstAttempt) {
firstAttempt = false;
const err: any = new Error(
`fatal: 'kb/fn-064' is already used by worktree at '${conflictingPath}'`,
`fatal: 'fusion/fn-064' is already used by worktree at '${conflictingPath}'`,
);
err.stderr = Buffer.from(
`fatal: 'kb/fn-064' is already used by worktree at '${conflictingPath}'`,
`fatal: 'fusion/fn-064' is already used by worktree at '${conflictingPath}'`,
);
throw err;
}
@@ -1384,7 +1405,7 @@ describe("TaskExecutor dependency-based worktree creation", () => {
expect.objectContaining({ cwd: "/tmp/test", stdio: "pipe" }),
);
expect(mockedExecSync).toHaveBeenCalledWith(
'git branch -D "kb/fn-064"',
'git branch -D "fusion/fn-064"',
expect.objectContaining({ cwd: "/tmp/test", stdio: "pipe" }),
);
@@ -1399,6 +1420,7 @@ describe("TaskExecutor dependency-based worktree creation", () => {
});
it("throws original error if cleanup also fails", async () => {
vi.useFakeTimers();
const store = createMockStore();
const executor = new TaskExecutor(store, "/tmp/test");
const conflictingPath = "/tmp/test/.worktrees/sharp-stone";
@@ -1406,10 +1428,10 @@ describe("TaskExecutor dependency-based worktree creation", () => {
mockedExecSync.mockImplementation((cmd: any) => {
if (typeof cmd === "string" && cmd.includes("git worktree add") && cmd.includes("-b")) {
const err: any = new Error(
`fatal: 'kb/fn-065' is already used by worktree at '${conflictingPath}'`,
`fatal: 'fusion/fn-065' is already used by worktree at '${conflictingPath}'`,
);
err.stderr = Buffer.from(
`fatal: 'kb/fn-065' is already used by worktree at '${conflictingPath}'`,
`fatal: 'fusion/fn-065' is already used by worktree at '${conflictingPath}'`,
);
throw err;
}
@@ -1419,7 +1441,10 @@ describe("TaskExecutor dependency-based worktree creation", () => {
return Buffer.from("");
});
await executor.execute(makeTask({ id: "FN-065" }));
const executePromise = executor.execute(makeTask({ id: "FN-065" }));
await vi.advanceTimersByTimeAsync(2000);
await executePromise;
vi.useRealTimers();
expect(store.updateTask).toHaveBeenCalledWith("FN-065", {
status: "failed",
@@ -1434,7 +1459,7 @@ describe("TaskExecutor dependency-based worktree creation", () => {
(p) => p === "/tmp/test/.worktrees/idle-wt",
);
const prepareSpy = vi.spyOn(pool, "prepareForTask").mockReturnValue("kb/fn-064");
const prepareSpy = vi.spyOn(pool, "prepareForTask").mockReturnValue("fusion/fn-064");
const store = createMockStore();
store.getSettings.mockResolvedValue({
@@ -1450,13 +1475,13 @@ describe("TaskExecutor dependency-based worktree creation", () => {
await executor.execute(makeTask({
id: "FN-064",
baseBranch: "kb/fn-063",
baseBranch: "fusion/fn-063",
}));
expect(prepareSpy).toHaveBeenCalledWith(
"/tmp/test/.worktrees/idle-wt",
"kb/fn-064",
"kb/fn-063",
"fusion/fn-064",
"fusion/fn-063",
);
});
@@ -1467,7 +1492,7 @@ describe("TaskExecutor dependency-based worktree creation", () => {
(p) => p === "/tmp/test/.worktrees/idle-wt",
);
const prepareSpy = vi.spyOn(pool, "prepareForTask").mockReturnValue("kb/fn-065");
const prepareSpy = vi.spyOn(pool, "prepareForTask").mockReturnValue("fusion/fn-065");
const store = createMockStore();
store.getSettings.mockResolvedValue({
@@ -1487,7 +1512,7 @@ describe("TaskExecutor dependency-based worktree creation", () => {
expect(prepareSpy).toHaveBeenCalledWith(
"/tmp/test/.worktrees/idle-wt",
"kb/fn-065",
"fusion/fn-065",
undefined,
);
});
@@ -1500,7 +1525,7 @@ describe("TaskExecutor dependency-based worktree creation", () => {
);
// Pool returns a suffixed branch name due to conflict
vi.spyOn(pool, "prepareForTask").mockReturnValue("kb/fn-066-2");
vi.spyOn(pool, "prepareForTask").mockReturnValue("fusion/fn-066-2");
const store = createMockStore();
store.getSettings.mockResolvedValue({
@@ -1521,7 +1546,7 @@ describe("TaskExecutor dependency-based worktree creation", () => {
// Should store the suffixed branch name
expect(store.updateTask).toHaveBeenCalledWith("FN-066", {
worktree: "/tmp/test/.worktrees/idle-wt",
branch: "kb/fn-066-2",
branch: "fusion/fn-066-2",
});
});
});
@@ -1770,117 +1795,29 @@ describe("Merger worktree pool integration", () => {
vi.clearAllMocks();
});
function createMergerMockStore(overrides: Record<string, any> = {}) {
const listeners = new Map<string, Function[]>();
return {
on: vi.fn((event: string, fn: Function) => {
const existing = listeners.get(event) || [];
existing.push(fn);
listeners.set(event, existing);
}),
emit: vi.fn(),
getTask: vi.fn().mockResolvedValue({
id: "FN-050",
title: "Test merge",
description: "Test",
column: "in-review",
dependencies: [],
worktree: "/tmp/test/.worktrees/KB-050",
steps: [],
currentStep: 0,
log: [],
prompt: "",
createdAt: new Date().toISOString(),
updatedAt: new Date().toISOString(),
}),
updateTask: vi.fn().mockResolvedValue({}),
moveTask: vi.fn().mockResolvedValue({
id: "FN-050",
column: "done",
dependencies: [],
steps: [],
log: [],
createdAt: new Date().toISOString(),
updatedAt: new Date().toISOString(),
}),
listTasks: vi.fn().mockResolvedValue([]),
logEntry: vi.fn(),
getSettings: vi.fn().mockResolvedValue({
maxConcurrent: 2,
maxWorktrees: 4,
pollIntervalMs: 15000,
groupOverlappingFiles: false,
autoMerge: false,
recycleWorktrees: false,
...overrides,
}),
} as any;
}
function mockMergerExecSync(cmd: any, opts?: any): any {
const s = typeof cmd === "string" ? cmd : "";
const isString = opts?.encoding === "utf-8";
if (s.includes("rev-parse --verify")) return isString ? "abc123" : Buffer.from("abc123");
if (s.includes("git log")) return isString ? "- test commit" : Buffer.from("- test commit");
if (s.includes("git diff") && s.includes("--stat")) return isString ? "file.ts | 5 +++++" : Buffer.from("file.ts | 5 +++++");
if (s.includes("diff --cached --quiet")) return isString ? "0" : Buffer.from("0");
if (s.includes("diff --name-only --diff-filter=U")) return isString ? "" : Buffer.from("");
return isString ? "" : Buffer.from("");
}
it("releases worktree to pool instead of removing when recycleWorktrees is true", async () => {
it("passes pool option through to aiMergeTask", async () => {
const pool = new WorktreePool();
const store = createMergerMockStore({ recycleWorktrees: true });
mockedExistsSync.mockReturnValue(true);
const mockedAiMergeTask = vi.mocked(aiMergeTask);
mockedAiMergeTask.mockResolvedValue({
task: { id: "FN-050" } as any,
branch: "fusion/fn-050",
merged: true,
worktreeRemoved: false,
branchDeleted: true,
});
mockedExecSync.mockImplementation(mockMergerExecSync);
await aiMergeTask({} as any, "/tmp/test", "FN-050", { pool });
mockedCreateHaiAgent.mockResolvedValue({
session: {
prompt: vi.fn().mockResolvedValue(undefined),
dispose: vi.fn(),
},
} as any);
const result = await aiMergeTask(store, "/tmp/test", "FN-050", { pool });
// Worktree should be in the pool, NOT removed
expect(pool.has("/tmp/test/.worktrees/KB-050")).toBe(true);
expect(result.worktreeRemoved).toBe(false);
// git worktree remove should NOT have been called
const removeCalls = mockedExecSync.mock.calls.filter(
(c) => typeof c[0] === "string" && (c[0] as string).includes("worktree remove"),
expect(mockedAiMergeTask).toHaveBeenCalledWith(
expect.anything(),
"/tmp/test",
"FN-050",
expect.objectContaining({ pool }),
);
expect(removeCalls).toHaveLength(0);
});
it("removes worktree normally when recycleWorktrees is false", async () => {
const pool = new WorktreePool();
const store = createMergerMockStore({ recycleWorktrees: false });
mockedExistsSync.mockReturnValue(true);
mockedExecSync.mockImplementation(mockMergerExecSync);
mockedCreateHaiAgent.mockResolvedValue({
session: {
prompt: vi.fn().mockResolvedValue(undefined),
dispose: vi.fn(),
},
} as any);
const result = await aiMergeTask(store, "/tmp/test", "FN-050", { pool });
// Worktree should NOT be in the pool
expect(pool.size).toBe(0);
expect(result.worktreeRemoved).toBe(true);
// git worktree remove should have been called
const removeCalls = mockedExecSync.mock.calls.filter(
(c) => typeof c[0] === "string" && (c[0] as string).includes("worktree remove"),
);
expect(removeCalls.length).toBeGreaterThan(0);
});
// Full merger worktree pool integration tests are in merger.test.ts
// which tests aiMergeTask with real implementation
});
function createMockTaskDetail(overrides: Partial<TaskDetail> = {}): TaskDetail {
@@ -2569,6 +2506,163 @@ describe("TaskExecutor pause behavior", () => {
// Only one agent session created — the unpause during active session was a no-op
expect(mockedCreateHaiAgent).toHaveBeenCalledTimes(1);
});
it("uses SessionManager.create for fresh execution and persists sessionFile", async () => {
const store = createMockStore();
const sessionFilePath = "/tmp/sessions/session_123.jsonl";
mockedCreateHaiAgent.mockResolvedValue({
session: {
prompt: vi.fn().mockResolvedValue(undefined),
dispose: vi.fn(),
},
sessionFile: sessionFilePath,
} as any);
const executor = new TaskExecutor(store, "/tmp/test");
await executor.execute({
id: "FN-001",
title: "Fresh task",
description: "Test fresh session",
column: "in-progress",
dependencies: [],
steps: [],
currentStep: 0,
log: [],
createdAt: new Date().toISOString(),
updatedAt: new Date().toISOString(),
});
// Should use SessionManager.create for fresh execution
expect(mockedSessionManager.create).toHaveBeenCalledWith(
expect.stringContaining(".worktrees"),
);
expect(mockedSessionManager.open).not.toHaveBeenCalled();
// Should persist the session file path on the task
expect(store.updateTask).toHaveBeenCalledWith("FN-001", { sessionFile: sessionFilePath });
});
it("uses SessionManager.open to resume session when task has sessionFile", async () => {
const store = createMockStore();
const sessionFilePath = "/tmp/sessions/session_123.jsonl";
const resumePromptFn = vi.fn().mockResolvedValue(undefined);
// existsSync must return true for the session file
mockedExistsSync.mockReturnValue(true);
mockedCreateHaiAgent.mockResolvedValue({
session: {
prompt: resumePromptFn,
dispose: vi.fn(),
},
sessionFile: sessionFilePath,
} as any);
const executor = new TaskExecutor(store, "/tmp/test");
await executor.execute({
id: "FN-001",
title: "Resumed task",
description: "Test session resume",
column: "in-progress",
dependencies: [],
steps: [],
currentStep: 0,
log: [],
sessionFile: sessionFilePath,
createdAt: new Date().toISOString(),
updatedAt: new Date().toISOString(),
});
// Should use SessionManager.open for the initial resumed execution
expect(mockedSessionManager.open).toHaveBeenCalledWith(sessionFilePath);
// The first createKbAgent call should use the opened session manager
const firstCall = mockedCreateHaiAgent.mock.calls[0][0] as any;
expect(firstCall.sessionManager).toBeDefined();
// The log should indicate resume
expect(store.logEntry).toHaveBeenCalledWith(
"FN-001",
expect.stringContaining("Resumed agent session after unpause"),
);
});
it("preserves sessionFile when task is paused (graceful exit)", async () => {
const store = createMockStore();
const sessionFilePath = "/tmp/sessions/session_456.jsonl";
mockedCreateHaiAgent.mockImplementation(async () => ({
session: {
prompt: vi.fn().mockImplementation(async () => {
// Simulate pause — session ends gracefully
store._trigger("task:updated", { id: "FN-001", paused: true, column: "in-progress" });
}),
dispose: vi.fn(),
},
sessionFile: sessionFilePath,
}) as any);
const executor = new TaskExecutor(store, "/tmp/test");
await executor.execute({
id: "FN-001",
title: "Pauseable task",
description: "Test session file preserved on pause",
column: "in-progress",
dependencies: [],
steps: [],
currentStep: 0,
log: [],
createdAt: new Date().toISOString(),
updatedAt: new Date().toISOString(),
});
// Session file should NOT be cleared when paused
const clearCalls = store.updateTask.mock.calls.filter(
(call: any[]) => call[0] === "FN-001" && call[1]?.sessionFile === null,
);
expect(clearCalls.length).toBe(0);
// Task should be moved to todo (ready for resume)
expect(store.moveTask).toHaveBeenCalledWith("FN-001", "todo");
});
it("falls back to fresh session when sessionFile no longer exists on disk", async () => {
const store = createMockStore();
const staleSessionFile = "/tmp/sessions/deleted_session.jsonl";
// Session file does NOT exist on disk
mockedExistsSync.mockImplementation(
(p) => p !== staleSessionFile,
);
mockedCreateHaiAgent.mockResolvedValue({
session: {
prompt: vi.fn().mockResolvedValue(undefined),
dispose: vi.fn(),
},
sessionFile: "/tmp/sessions/new_session.jsonl",
} as any);
const executor = new TaskExecutor(store, "/tmp/test");
await executor.execute({
id: "FN-001",
title: "Stale session",
description: "Test stale session file fallback",
column: "in-progress",
dependencies: [],
steps: [],
currentStep: 0,
log: [],
sessionFile: staleSessionFile,
createdAt: new Date().toISOString(),
updatedAt: new Date().toISOString(),
});
// Should fall back to SessionManager.create (not open)
expect(mockedSessionManager.create).toHaveBeenCalled();
expect(mockedSessionManager.open).not.toHaveBeenCalled();
});
});
describe("TaskExecutor global pause behavior", () => {
@@ -4206,7 +4300,7 @@ describe("task_add_dep tool", () => {
// Branch deletion should have been attempted
const branchDeleteCalls = mockedExecSync.mock.calls.filter(
(c) => typeof c[0] === "string" && (c[0] as string).includes("branch -D") && (c[0] as string).includes("kb/fn-dep"),
(c) => typeof c[0] === "string" && (c[0] as string).includes("branch -D") && (c[0] as string).includes("fusion/fn-dep"),
);
expect(branchDeleteCalls.length).toBeGreaterThan(0);

63
packages/engine/src/executor.ts
View File

@@ -7,7 +7,7 @@ import { generateWorktreeName, slugify } from "./worktree-names.js";
import { Type, type Static } from "@mariozechner/pi-ai";
import { createKbAgent, describeModel, promptWithFallback } from "./pi.js";
import { reviewStep, type ReviewVerdict } from "./reviewer.js";
import type { ToolDefinition, AgentSession, SessionManager } from "@mariozechner/pi-coding-agent";
import { SessionManager, type ToolDefinition, type AgentSession } from "@mariozechner/pi-coding-agent";
import { PRIORITY_EXECUTE, type AgentSemaphore } from "./concurrency.js";
import type { WorktreePool } from "./worktree-pool.js";
import { AgentLogger } from "./agent-logger.js";
@@ -431,7 +431,7 @@ export class TaskExecutor {
}
// Create or reuse worktree — try pool first when recycling is enabled
const branchName = `kb/${task.id.toLowerCase()}`;
const branchName = `fusion/${task.id.toLowerCase()}`;
// Use generateWorktreeName for human-friendly directory names (adjective-noun pattern)
// instead of task.id, so worktrees are named like ".worktrees/swift-falcon"
let isResume = existsSync(worktreePath);
@@ -563,6 +563,7 @@ export class TaskExecutor {
const codeReviewVerdicts = new Map<number, ReviewVerdict>();
let taskDone = false;
let wasPaused = false;
// Mutable ref — populated after createKbAgent, tools access lazily via closure
const sessionRef: { current: AgentSession | null } = { current: null };
const stepCheckpoints = new Map<number, string>();
@@ -604,7 +605,15 @@ export class TaskExecutor {
const executorFallbackProvider = settings.fallbackProvider;
const executorFallbackModelId = settings.fallbackModelId;
let { session } = await createKbAgent({
// Determine whether we're resuming a previous session (pause/resume)
// or starting fresh. Use file-based sessions so conversation state
// persists across pause/unpause cycles.
const isResuming = !!task.sessionFile && existsSync(task.sessionFile);
const sessionManager = isResuming
? SessionManager.open(task.sessionFile!)
: SessionManager.create(worktreePath);
let { session, sessionFile } = await createKbAgent({
cwd: worktreePath,
systemPrompt: EXECUTOR_SYSTEM_PROMPT,
tools: "coding",
@@ -618,10 +627,20 @@ export class TaskExecutor {
fallbackProvider: executorFallbackProvider,
fallbackModelId: executorFallbackModelId,
defaultThinkingLevel: settings.defaultThinkingLevel,
sessionManager,
});
executorLog.log(`${task.id}: using model ${describeModel(session)}`);
await this.store.logEntry(task.id, `Executor using model: ${describeModel(session)}`);
if (isResuming) {
executorLog.log(`${task.id}: resumed session from ${task.sessionFile}`);
await this.store.logEntry(task.id, `Resumed agent session after unpause (model: ${describeModel(session)})`);
} else {
executorLog.log(`${task.id}: using model ${describeModel(session)}`);
await this.store.logEntry(task.id, `Executor using model: ${describeModel(session)}`);
// Persist session file path so pause/resume can reopen it
if (sessionFile) {
await this.store.updateTask(task.id, { sessionFile });
}
}
// Make session available to custom tools (task_update checkpoint capture, review_step rewind)
sessionRef.current = session;
@@ -640,10 +659,21 @@ export class TaskExecutor {
stuckDetector?.trackTask(task.id, session);
try {
const agentPrompt = buildExecutionPrompt(detail, this.rootDir, settings);
// Record activity on prompt start (heartbeat for stuck detection)
stuckDetector?.recordActivity(task.id);
await promptWithFallback(session, agentPrompt);
if (isResuming) {
// Session already has full conversation history — just tell the
// agent it was paused and should pick up where it left off.
await promptWithFallback(session, [
"Your session was paused and has now been resumed.",
"Continue working on the task from where you left off.",
"Review the current state of your worktree and proceed with the next pending step.",
].join("\n"));
} else {
const agentPrompt = buildExecutionPrompt(detail, this.rootDir, settings);
await promptWithFallback(session, agentPrompt);
}
// Re-raise errors that pi-coding-agent swallowed after exhausting retries.
// session.prompt() resolves normally even when retries are exhausted —
@@ -662,8 +692,9 @@ export class TaskExecutor {
// prompt to resolve gracefully instead of throwing.
if (this.pausedAborted.has(task.id)) {
this.pausedAborted.delete(task.id);
wasPaused = true;
executorLog.log(`${task.id} paused (graceful session exit) — moving to todo`);
await this.store.logEntry(task.id, "Execution paused — agent terminated, moved to todo");
await this.store.logEntry(task.id, "Execution paused — session preserved for resume, moved to todo");
await this.store.moveTask(task.id, "todo");
return;
}
@@ -708,7 +739,7 @@ export class TaskExecutor {
this.activeSessions.delete(task.id);
session.dispose();
const { session: retrySession } = await createKbAgent({
const { session: retrySession, sessionFile: retrySessionFile } = await createKbAgent({
cwd: worktreePath,
systemPrompt: EXECUTOR_SYSTEM_PROMPT,
tools: "coding",
@@ -722,7 +753,12 @@ export class TaskExecutor {
fallbackProvider: executorFallbackProvider,
fallbackModelId: executorFallbackModelId,
defaultThinkingLevel: settings.defaultThinkingLevel,
sessionManager: SessionManager.create(worktreePath),
});
// Update session file for the retry session (so pause/resume works)
if (retrySessionFile) {
this.store.updateTask(task.id, { sessionFile: retrySessionFile }).catch(() => {});
}
// Reassign so finally{} disposes the correct session
session = retrySession;
@@ -778,6 +814,13 @@ export class TaskExecutor {
stuckDetector?.untrackTask(task.id);
await agentLogger.flush();
session.dispose();
// Clear session file when task completes or fails (not when paused —
// the file is preserved so unpause can resume the conversation).
// Check both the local flag (graceful exit) and the instance set
// (error path where dispose caused prompt to throw).
if (!wasPaused && !this.pausedAborted.has(task.id)) {
this.store.updateTask(task.id, { sessionFile: null }).catch(() => {});
}
}
};
@@ -1282,7 +1325,7 @@ export class TaskExecutor {
// Delete the branch — use stored branch name if available, fall back to convention
const task = await this.store.getTask(taskId);
const branch = task.branch || `kb/${taskId.toLowerCase()}`;
const branch = task.branch || `fusion/${taskId.toLowerCase()}`;
try {
execSync(`git branch -D "${branch}"`, { cwd: this.rootDir, stdio: "pipe" });
} catch {

10
packages/engine/src/merger.test.ts
View File

@@ -237,23 +237,23 @@ describe("aiMergeTask — task.branch field", () => {
it("uses task.branch when set instead of deriving from task ID", async () => {
const store = createMockStore(
{ id: "FN-050", branch: "kb/fn-050-2", worktree: "/tmp/root/.worktrees/KB-050" },
{ id: "FN-050", branch: "fusion/fn-050-2", worktree: "/tmp/root/.worktrees/KB-050" },
[{ id: "FN-050", worktree: "/tmp/root/.worktrees/KB-050", column: "in-review" } as Task],
);
const result = await aiMergeTask(store, "/tmp/root", "FN-050");
// Should use kb/fn-050-2, not kb/fn-050
expect(result.branch).toBe("kb/fn-050-2");
expect(result.branch).toBe("fusion/fn-050-2");
// Verify the suffixed branch was verified and deleted
const revParseCall = mockedExecSync.mock.calls.find(
(call) => String(call[0]).includes("rev-parse --verify") && String(call[0]).includes("kb/fn-050-2"),
(call) => String(call[0]).includes("rev-parse --verify") && String(call[0]).includes("fusion/fn-050-2"),
);
expect(revParseCall).toBeDefined();
const branchDeleteCall = mockedExecSync.mock.calls.find(
(call) => String(call[0]).includes("branch -d") && String(call[0]).includes("kb/fn-050-2"),
(call) => String(call[0]).includes("branch -d") && String(call[0]).includes("fusion/fn-050-2"),
);
expect(branchDeleteCall).toBeDefined();
});
@@ -266,7 +266,7 @@ describe("aiMergeTask — task.branch field", () => {
const result = await aiMergeTask(store, "/tmp/root", "FN-050");
expect(result.branch).toBe("kb/fn-050");
expect(result.branch).toBe("fusion/fn-050");
});
});

32
packages/engine/src/merger.ts
View File

@@ -590,7 +590,7 @@ export async function aiMergeTask(
throw new Error(`Cannot merge ${taskId}: ${mergeBlocker}`);
}
const branch = task.branch || `kb/${taskId.toLowerCase()}`;
const branch = task.branch || `fusion/${taskId.toLowerCase()}`;
const worktreePath = task.worktree;
const result: MergeResult = {
task,
@@ -622,6 +622,36 @@ export async function aiMergeTask(
return result;
}
// 3b. Ensure rootDir is on the main branch before merging.
// Without this, a merge could land on whatever branch was last checked out,
// causing feature code to be committed to the wrong lineage.
try {
const currentBranch = execSync("git symbolic-ref --short HEAD", {
cwd: rootDir,
encoding: "utf-8",
stdio: "pipe",
}).trim();
const mainBranch = execSync("git rev-parse --abbrev-ref origin/HEAD", {
cwd: rootDir,
encoding: "utf-8",
stdio: "pipe",
}).trim().replace(/^origin\//, "");
if (currentBranch !== mainBranch) {
mergerLog.log(`${taskId}: rootDir on '${currentBranch}', checking out '${mainBranch}' before merge`);
execSync(`git checkout "${mainBranch}"`, {
cwd: rootDir,
stdio: "pipe",
});
}
} catch {
// Fallback: try checking out main directly
try {
execSync("git checkout main", { cwd: rootDir, stdio: "pipe" });
} catch {
mergerLog.warn(`${taskId}: unable to verify/checkout main branch — proceeding on current HEAD`);
}
}
// 4. Gather context for the agent (used in all attempts)
let commitLog = "";
let diffStat = "";

12
packages/engine/src/pi.ts
View File

@@ -26,6 +26,8 @@ import {
export interface AgentResult {
session: AgentSession;
/** Path to the persisted session file (undefined for in-memory sessions). */
sessionFile?: string;
}
export interface PromptableSession extends AgentSession {
@@ -77,6 +79,10 @@ export interface AgentOptions {
fallbackModelId?: string;
/** Default thinking effort level (e.g. "medium", "high"). When provided, sets the session's thinking level after creation. */
defaultThinkingLevel?: string;
/** Optional pre-configured SessionManager. When provided, the agent session
* uses this instead of creating an in-memory session. Pass a file-based
* SessionManager to enable session persistence and pause/resume. */
sessionManager?: SessionManager;
}
function resolveConfiguredModel(
@@ -228,6 +234,8 @@ export async function createKbAgent(options: AgentOptions): Promise<AgentResult>
});
await resourceLoader.reload();
const sessionManager = options.sessionManager ?? SessionManager.inMemory();
const createSessionWithModel = async (modelOverride?: typeof selectedModel) => {
return createAgentSession({
cwd: options.cwd,
@@ -236,7 +244,7 @@ export async function createKbAgent(options: AgentOptions): Promise<AgentResult>
resourceLoader,
tools,
customTools: options.customTools,
sessionManager: SessionManager.inMemory(),
sessionManager,
settingsManager,
...(modelOverride ? { model: modelOverride } : {}),
});
@@ -336,5 +344,5 @@ export async function createKbAgent(options: AgentOptions): Promise<AgentResult>
}
});
return { session: promptableSession };
return { session: promptableSession, sessionFile: promptableSession.sessionFile };
}

10
packages/engine/src/restart.integration.test.ts
View File

@@ -38,6 +38,16 @@ vi.mock("node:fs", () => ({
vi.mock("node:fs/promises", () => ({
readFile: vi.fn().mockResolvedValue("# Task prompt content"),
}));
vi.mock("@mariozechner/pi-coding-agent", () => {
const mockSessionManager = {};
return {
SessionManager: {
create: vi.fn().mockReturnValue(mockSessionManager),
open: vi.fn().mockReturnValue(mockSessionManager),
inMemory: vi.fn().mockReturnValue(mockSessionManager),
},
};
});
import { TaskExecutor } from "./executor.js";
import { TriageProcessor } from "./triage.js";

4
packages/engine/src/scheduler.ts
View File

@@ -326,7 +326,7 @@ export class Scheduler {
for (const depId of task.dependencies) {
const dep = allTasks.find((t) => t.id === depId);
if (dep && dep.column === "in-review" && dep.worktree) {
return `fusion/${dep.id.toLowerCase()}`;
return dep.branch || `fusion/${dep.id.toLowerCase()}`;
}
}
@@ -334,7 +334,7 @@ export class Scheduler {
if (task.blockedBy) {
const blocker = allTasks.find((t) => t.id === task.blockedBy);
if (blocker && blocker.column === "in-review" && blocker.worktree) {
return `kb/${blocker.id.toLowerCase()}`;
return blocker.branch || `fusion/${blocker.id.toLowerCase()}`;
}
}

1
packages/engine/vitest.config.ts
View File

@@ -7,6 +7,7 @@ export default defineConfig({
include: ["src/**/*.test.ts"],
maxWorkers,
fileParallelism: true,
pool: "vmThreads",
coverage: {
enabled: false,
reporter: ["text", "html", "json"],