diff --git a/index.ts b/index.ts
index 9f07d0a..1eef8e5 100644
--- a/index.ts
+++ b/index.ts
@@ -434,6 +434,35 @@ const STATUS_ZOMBIE_MS = 60 * 60_000
 const STATUS_PATH = process.env.TAAS_AFFINITY_RUNS_STATUS_PATH
 	|| path.join(os.homedir(), ".openclaw", "alien-studio", "runs-status.json")
 
+// ── Zombie auto-abort configuration ───────────────────────────────────────────
+// ⚠️  PLUGIN BLOCKED: No plugin-side dispatch for chat.abort exists in the OpenClaw
+//     plugin SDK. The default abortRun function logs a warning and is a no-op.
+//     When the SDK adds api.runtime.chat.abort() or dispatchGatewayMethod(),
+//     replace the default abortRun in register() below.
+//     Set TAAS_AFFINITY_AUTO_ABORT_ZOMBIES=true to enable (currently opt-in).
+const AUTO_ABORT_ENABLED = process.env.TAAS_AFFINITY_AUTO_ABORT_ZOMBIES === "true"
+const AUTO_ABORT_DRY_RUN = process.env.TAAS_AFFINITY_AUTO_ABORT_DRY_RUN === "true"
+const AUTO_ABORT_THRESHOLD_MS = Number(process.env.TAAS_AFFINITY_AUTO_ABORT_THRESHOLD_MS) || STATUS_ZOMBIE_MS
+const AUTO_ABORT_CHECK_INTERVAL_MS = Number(process.env.TAAS_AFFINITY_AUTO_ABORT_CHECK_INTERVAL_MS) || 60_000
+const AUTO_ABORT_ABORTED_SET_MAX = 1000
+
+/** In-memory set of sessionKeys already aborted in this process (LRU-bounded). */
+const abortedInThisProcess: string[] = []
+
+/**
+ * Injected abort function. Default logs a warning because the plugin SDK does not
+ * expose a way to dispatch chat.abort from inside a plugin. Replace via
+ * setAbortRunFn() in tests or when the SDK adds the capability.
+ */
+let abortRun: (sessionKey: string) => Promise<void> = async (sessionKey: string) => {
+	console.warn("[taas-affinity] auto-abort: chat.abort not available via plugin SDK; sessionKey=" + sessionKey)
+}
+
+/** Replace the abort function (for testing or future SDK integration). */
+function setAbortRunFn(fn: (sessionKey: string) => Promise<void>): void {
+	abortRun = fn
+}
+
 function stopRequesterBridgePoller(leaseId?: string): void {
 	if (!leaseId) return
 	const state = activePollers.get(leaseId)
@@ -894,6 +923,94 @@ function writeRunStatus(agentsDir?: string, statusPath?: string): void {
 	}
 }
 
+// ── Zombie auto-abort ──────────────────────────────────────────────────────────
+let abortCheckInProgress = false
+
+function runAbortCheck(agentsDir?: string): void {
+	if (abortCheckInProgress) return
+	abortCheckInProgress = true
+	try {
+		const base = agentsDir || path.join(os.homedir(), ".openclaw", "agents")
+		let agents: string[]
+		try { agents = fs.readdirSync(base) } catch { agents = [] }
+
+		const zombies: Array<{ sessionKey: string; idleMs: number }> = []
+
+		for (const agentId of agents) {
+			const sessionsDir = path.join(base, agentId, "sessions")
+			let entries: string[]
+			try { entries = fs.readdirSync(sessionsDir) } catch { continue }
+
+			let mainKey: string | null = null
+			try {
+				const idJson = fs.readFileSync(path.join(base, agentId, "agent", "identity.json"), "utf8")
+				const parsed = JSON.parse(idJson)
+				if (typeof parsed.mainKey === "string") mainKey = parsed.mainKey
+			} catch { /* no identity file */ }
+
+			let mainUuid: string | null = null
+			if (mainKey) {
+				const parts = mainKey.split(":")
+				const lastPart = parts[parts.length - 1]
+				if (lastPart !== "main" && lastPart.length >= 8) {
+					mainUuid = lastPart
+				}
+			}
+
+			for (const name of entries) {
+				if (!name.endsWith(".jsonl.lock")) continue
+				const sessionUuid = name.replace(/\.jsonl\.lock$/, "")
+				const fp = path.join(sessionsDir, name)
+				let st: fs.Stats
+				try { st = fs.statSync(fp) } catch { continue }
+
+				const idleMs = Date.now() - st.mtimeMs
+				if (idleMs < AUTO_ABORT_THRESHOLD_MS) continue
+
+				let sessionKey: string
+				if (mainKey && sessionUuid === mainUuid) {
+					sessionKey = "agent:" + agentId + ":main"
+				} else {
+					sessionKey = "agent:" + agentId + ":session:" + sessionUuid
+				}
+
+				zombies.push({ sessionKey, idleMs })
+			}
+		}
+
+		// When auto-abort is disabled (default), just log candidates
+		if (!AUTO_ABORT_ENABLED) {
+			if (zombies.length > 0) {
+				console.info("[taas-affinity] zombie candidates (auto-abort disabled): " + zombies.length + " runs: " + zombies.map(z => z.sessionKey).join(", "))
+			}
+			return
+		}
+
+		// Auto-abort is enabled — abort each zombie not already aborted in this process
+		for (const z of zombies) {
+			if (abortedInThisProcess.includes(z.sessionKey)) continue
+			// Cap the set at AUTO_ABORT_ABORTED_SET_MAX (FIFO eviction)
+			if (abortedInThisProcess.length >= AUTO_ABORT_ABORTED_SET_MAX) {
+				abortedInThisProcess.shift()
+			}
+			abortedInThisProcess.push(z.sessionKey)
+
+			if (AUTO_ABORT_DRY_RUN) {
+				console.info("[taas-affinity] auto-abort DRY RUN: would abort sessionKey=" + z.sessionKey + " idleMs=" + z.idleMs)
+			} else {
+				console.warn("[taas-affinity] auto-aborting zombie run sessionKey=" + z.sessionKey + " idleMs=" + z.idleMs)
+				abortRun(z.sessionKey).catch((e: unknown) => {
+					console.warn("[taas-affinity] auto-abort failed sessionKey=" + z.sessionKey, e)
+				})
+			}
+		}
+	} catch (e) {
+		console.warn("[taas-affinity] abort-check error", e)
+	} finally {
+		abortCheckInProgress = false
+	}
+}
+
 // ── Background task scheduler ────────────────────────────────────────────────
 const backgroundTimers: (NodeJS.Timeout)[] = []
 
@@ -912,6 +1029,13 @@ function startBackgroundTasks(): void {
 		backgroundTimers.push(setInterval(() => writeRunStatus(), STATUS_INTERVAL_MS))
 	}, 5_000)
 	backgroundTimers.push(statusInit)
+
+	// Zombie auto-abort — 10s initial delay, then every AUTO_ABORT_CHECK_INTERVAL_MS
+	const abortInit = setTimeout(() => {
+		runAbortCheck()
+		backgroundTimers.push(setInterval(() => runAbortCheck(), AUTO_ABORT_CHECK_INTERVAL_MS))
+	}, 10_000)
+	backgroundTimers.push(abortInit)
 }
 
 const LAST_ROUTE_LIMIT = 256
@@ -1161,7 +1285,12 @@ export default {
 	_testExports: {
 		runTrashSweep,
 		writeRunStatus,
+		runAbortCheck,
+		setAbortRunFn,
 		resetSweepInProgress: () => { sweepInProgress = false },
 		resetStatusInProgress: () => { statusInProgress = false },
+		resetAbortCheckInProgress: () => { abortCheckInProgress = false },
+		clearAbortedInThisProcess: () => { abortedInThisProcess.length = 0 },
+		getAbortedInThisProcess: () => [...abortedInThisProcess],
 	},
 }
diff --git a/test/auto-abort.test.ts b/test/auto-abort.test.ts
new file mode 100644
index 0000000..c04af0d
--- /dev/null
+++ b/test/auto-abort.test.ts
@@ -0,0 +1,229 @@
+import assert from "node:assert/strict"
+import fs from "node:fs"
+import os from "node:os"
+import path from "node:path"
+import { test } from "node:test"
+
+// Helper: dynamic import with cache bust
+async function loadPlugin(env: Record<string, string | undefined> = {}) {
+	const oldEnv: Record<string, string | undefined> = {}
+	for (const [key, value] of Object.entries(env)) {
+		oldEnv[key] = process.env[key]
+		if (value === undefined) delete process.env[key]
+		else process.env[key] = value
+	}
+	const mod = await import(`../index.ts?bust=${Date.now()}-${Math.random()}`)
+	for (const [key, value] of Object.entries(oldEnv)) {
+		if (value === undefined) delete process.env[key]
+		else process.env[key] = value
+	}
+	return mod
+}
+
+// Helper: create a temp agents dir with zombie lock files
+function createTempAgentsDir(structure: Array<{
+	agentId: string
+	sessions: Array<{ uuid: string; mtimeAgeMs: number; pid?: number }>
+	identityJson?: Record<string, unknown>
+}>) {
+	const base = fs.mkdtempSync(path.join(os.tmpdir(), "taas-abort-test-"))
+	for (const { agentId, sessions = [], identityJson } of structure) {
+		const sessDir = path.join(base, agentId, "sessions")
+		fs.mkdirSync(sessDir, { recursive: true })
+		for (const s of sessions) {
+			const lockPath = path.join(sessDir, s.uuid + ".jsonl.lock")
+			fs.writeFileSync(lockPath, s.pid != null ? String(s.pid) : "12345")
+			const newMtime = new Date(Date.now() - s.mtimeAgeMs)
+			fs.utimesSync(lockPath, newMtime, newMtime)
+		}
+		if (identityJson) {
+			const agentDir = path.join(base, agentId, "agent")
+			fs.mkdirSync(agentDir, { recursive: true })
+			fs.writeFileSync(path.join(agentDir, "identity.json"), JSON.stringify(identityJson))
+		}
+	}
+	return base
+}
+
+// Collect console output
+function collectConsole() {
+	const infoLogs: string[] = []
+	const warnLogs: string[] = []
+	const origInfo = console.info
+	const origWarn = console.warn
+	console.info = (...args: unknown[]) => { infoLogs.push(args.map(String).join(" ")) }
+	console.warn = (...args: unknown[]) => { warnLogs.push(args.map(String).join(" ")) }
+	return {
+		infoLogs,
+		warnLogs,
+		restore() {
+			console.info = origInfo
+			console.warn = origWarn
+		},
+	}
+}
+
+// AC-AUTO-ABORT.1: With auto-abort enabled, classify one zombie session, mock the abort callback, assert it was called with the right sessionKey.
+test("AC-AUTO-ABORT.1: auto-abort enabled calls abortRun for zombie session", async () => {
+	const mod = await loadPlugin({ TAAS_AFFINITY_AUTO_ABORT_ZOMBIES: "true" })
+	const { runAbortCheck, setAbortRunFn, resetAbortCheckInProgress, clearAbortedInThisProcess } = mod.default._testExports
+
+	clearAbortedInThisProcess()
+	resetAbortCheckInProgress()
+
+	const aborted: Array<{ sessionKey: string }> = []
+	setAbortRunFn(async (sessionKey: string) => {
+		aborted.push({ sessionKey })
+	})
+
+	// Create a zombie: lock file older than 60 min
+	const agentsDir = createTempAgentsDir([{
+		agentId: "test-agent",
+		sessions: [{ uuid: "abc12345-6789-def0-1234-567890abcdef", mtimeAgeMs: 65 * 60 * 1000 }],
+	}])
+
+	const logs = collectConsole()
+	try {
+		runAbortCheck(agentsDir)
+	} finally {
+		logs.restore()
+	}
+
+	assert.ok(aborted.length === 1, `Expected 1 abort, got ${aborted.length}`)
+	assert.match(aborted[0].sessionKey, /^agent:test-agent:session:abc12345/)
+})
+
+// AC-AUTO-ABORT.2: With auto-abort disabled (default), classify zombies, assert the abort callback was NOT called and one log line listing candidates.
+test("AC-AUTO-ABORT.2: auto-abort disabled logs candidates without aborting", async () => {
+	const mod = await loadPlugin({ TAAS_AFFINITY_AUTO_ABORT_ZOMBIES: undefined })
+	const { runAbortCheck, setAbortRunFn, resetAbortCheckInProgress, clearAbortedInThisProcess } = mod.default._testExports
+
+	clearAbortedInThisProcess()
+	resetAbortCheckInProgress()
+
+	const aborted: string[] = []
+	setAbortRunFn(async (sessionKey: string) => {
+		aborted.push(sessionKey)
+	})
+
+	// Create two zombie lock files
+	const agentsDir = createTempAgentsDir([{
+		agentId: "main",
+		sessions: [
+			{ uuid: "deadbeef-0000-0000-0000-000000000001", mtimeAgeMs: 70 * 60 * 1000 },
+			{ uuid: "deadbeef-0000-0000-0000-000000000002", mtimeAgeMs: 65 * 60 * 1000 },
+		],
+	}])
+
+	const logs = collectConsole()
+	try {
+		runAbortCheck(agentsDir)
+	} finally {
+		logs.restore()
+	}
+
+	assert.equal(aborted.length, 0, "abortRun should NOT be called when auto-abort is disabled")
+	// Check that we logged the candidates
+	const candidateLog = logs.infoLogs.find(l => l.includes("zombie candidates (auto-abort disabled)"))
+	assert.ok(candidateLog, `Expected candidate log, got: ${JSON.stringify(logs.infoLogs)}`)
+	assert.ok(candidateLog!.includes("2 runs"), `Expected '2 runs' in log, got: ${candidateLog}`)
+})
+
+// AC-AUTO-ABORT.3: Same zombie classified twice in successive ticks → abort callback called ONLY ONCE (idempotence via the in-memory set).
+test("AC-AUTO-ABORT.3: idempotent — same zombie only aborted once across two ticks", async () => {
+	const mod = await loadPlugin({ TAAS_AFFINITY_AUTO_ABORT_ZOMBIES: "true" })
+	const { runAbortCheck, setAbortRunFn, resetAbortCheckInProgress, clearAbortedInThisProcess } = mod.default._testExports
+
+	clearAbortedInThisProcess()
+	resetAbortCheckInProgress()
+
+	const aborted: string[] = []
+	setAbortRunFn(async (sessionKey: string) => {
+		aborted.push(sessionKey)
+	})
+
+	const agentsDir = createTempAgentsDir([{
+		agentId: "test-agent",
+		sessions: [{ uuid: "idempotent-0000-0000-000000000001", mtimeAgeMs: 66 * 60 * 1000 }],
+	}])
+
+	// First tick
+	resetAbortCheckInProgress()
+	runAbortCheck(agentsDir)
+	assert.equal(aborted.length, 1, "First tick should abort once")
+
+	// Second tick — same zombie is still there
+	resetAbortCheckInProgress()
+	runAbortCheck(agentsDir)
+	assert.equal(aborted.length, 1, "Second tick should NOT abort again — idempotent")
+})
+
+// AC-AUTO-ABORT.4: 1001 distinct zombies all aborted → the in-memory set caps at 1000 entries.
+test("AC-AUTO-ABORT.4: aborted set caps at 1000 entries (LRU eviction)", async () => {
+	const mod = await loadPlugin({ TAAS_AFFINITY_AUTO_ABORT_ZOMBIES: "true" })
+	const { runAbortCheck, setAbortRunFn, resetAbortCheckInProgress, clearAbortedInThisProcess, getAbortedInThisProcess } = mod.default._testExports
+
+	clearAbortedInThisProcess()
+	resetAbortCheckInProgress()
+
+	const aborted: string[] = []
+	setAbortRunFn(async (sessionKey: string) => {
+		aborted.push(sessionKey)
+	})
+
+	// Create 1100 zombie lock files (more than the 1000 cap)
+	const sessions = []
+	for (let i = 0; i < 1100; i++) {
+		sessions.push({
+			uuid: `zombie-${String(i).padStart(8, "0")}-0000-000000000000`,
+			mtimeAgeMs: (61 + (i % 10)) * 60 * 1000, // 61-70 min idle
+		})
+	}
+	const agentsDir = createTempAgentsDir([{
+		agentId: "load-agent",
+		sessions,
+	}])
+
+	resetAbortCheckInProgress()
+	runAbortCheck(agentsDir)
+
+	// All 1100 should have been passed to abortRun (they're new each time)
+	assert.equal(aborted.length, 1100, `Expected 1100 aborted calls, got ${aborted.length}`)
+
+	// The in-memory set should be capped at 1000
+	const set = getAbortedInThisProcess()
+	assert.ok(set.length <= 1000 && set.length > 0, `Expected set <= 1000, got ${set.length}`)
+})
+
+// Cleanup temp dirs (node:test handles most, but ensure)
+test("AC-AUTO-ABORT.5: dry-run mode logs but does not call abortRun", async () => {
+	const mod = await loadPlugin({
+		TAAS_AFFINITY_AUTO_ABORT_ZOMBIES: "true",
+		TAAS_AFFINITY_AUTO_ABORT_DRY_RUN: "true",
+	})
+	const { runAbortCheck, setAbortRunFn, resetAbortCheckInProgress, clearAbortedInThisProcess } = mod.default._testExports
+
+	clearAbortedInThisProcess()
+	resetAbortCheckInProgress()
+
+	const aborted: string[] = []
+	setAbortRunFn(async (sessionKey: string) => {
+		aborted.push(sessionKey)
+	})
+
+	const agentsDir = createTempAgentsDir([{
+		agentId: "dry-agent",
+		sessions: [{ uuid: "dryrun-test-0000-0000-000000000001", mtimeAgeMs: 65 * 60 * 1000 }],
+	}])
+
+	const logs = collectConsole()
+	try {
+		runAbortCheck(agentsDir)
+	} finally {
+		logs.restore()
+	}
+
+	assert.equal(aborted.length, 0, "dry-run should NOT call abortRun")
+	const dryLog = logs.infoLogs.find(l => l.includes("auto-abort DRY RUN"))
+	assert.ok(dryLog, `Expected DRY RUN log, got: ${JSON.stringify(logs.infoLogs)}`)
+})