fix: bound unproven profile submissions and support single-worker takeover

README.md

@@ -2,6 +2,51 @@
 
 This repository is packaged for the ModelHub XC agent platform.
 
+## Single-worker takeover release 2026.10.26.1
+
+This release is intended to replace the competing workers, using all configured
+accounts in one process. Deployment must stop the old **agent process**, not
+its already-submitted validation tasks. Code cannot reserve capacity while an
+old worker continues to refill the same accounts. No live stop or cancellation
+is performed by installing this release.
+
+Keep `MODELHUB_STATE_SYNC_BRANCH=agent-state-accuracy-v2` to resume the newest
+checkpoint. Startup adopts the live waiting/running queue by task ID, without
+resubmission or attributing old work to the new version. It retains existing
+aggregate evidence; do not add the old branch's lifetime counters to it, which
+would double-count shared tasks. Historical tasks without encoding/provenance
+remain unknown. Queue cancellation remains disabled by default during takeover;
+existing tasks continue occupying capacity until the platform finishes them.
+
+Changes:
+
+- Recognize MLX metadata and top-level quantization configuration. Unknown packed
+  formats are deferred before submission to conventional backends. GGUF routes
+  retain their existing file-specific checks. No repository-name heuristics.
+- Persist an encoding signature so FP8 and INT4 variants of compressed-tensors
+  do not share a feedback-admission budget. Until the exact architecture,
+  encoding, GPU and framework has three successes and at least 50% observed
+  non-platform success, admit at most two pending tasks per group, including
+  tasks selected in the same concurrent batch. Deferrals are not failures or
+  permanent exclusions; completed tasks release the budget. This cap only
+  constrains already-eligible candidates; it does not create exploratory routes.
+- In the same success-confidence band, completion-speed estimates precede
+  community popularity when ordering candidates. Quality gates remain enabled.
+- Persist per-version terminal results and print `[feedback]` with success,
+  failure and pending counts. Unexplained failed statuses no longer pretend to
+  identify a parameter/template defect.
+- Close Git repository handles, throttle idle-cycle snapshots to once per
+  minute (intent/result writes stay synchronous), bound history traversal, and
+  rotate the disposable local clone after verified history compaction so old
+  unreachable objects do not accumulate indefinitely.
+- Log worker RSS/high-water memory and available cgroup memory counters once
+  per minute; retain the last sample and exit-time OOM counters with crashes.
+
+The thresholds above are conservative policy settings, not a guarantee of a
+particular success rate. Evaluate actual terminal outcomes separately from
+waiting tasks after deployment. A full inherited queue will not immediately
+produce new capacity just because the old agent process has stopped.
+
 ## Accuracy release 2026.10.18.1
 
 This release rejects malformed YAML command arrays, including the observed

main.py

@@ -187,6 +187,33 @@ def _write_supervisor_readiness(reason: str, *, exit_code: int | None = None) ->
     os.replace(temporary, READINESS_PATH)
 
 
+_worker_memory_sample: dict[str, object] = {}
+_worker_memory_sample_at = 0.0
+
+
+def _sample_worker_memory(now: float) -> None:
+    global _worker_memory_sample, _worker_memory_sample_at
+    if now - _worker_memory_sample_at < 60:
+        return
+    _worker_memory_sample_at = now
+    sample: dict[str, object] = {"sampledAt": datetime.now(timezone.utc).isoformat()}
+    try:
+        pid = int(getattr(worker, "pid", 0))
+        for line in Path(f"/proc/{pid}/status").read_text().splitlines():
+            if line.startswith(("VmRSS:", "VmHWM:")):
+                name, value, *_ = line.split()
+                sample[name.rstrip(":") + "KiB"] = int(value)
+    except (OSError, ValueError, TypeError):
+        pass
+    for name in ("memory.current", "memory.peak", "memory.max", "memory.events"):
+        try:
+            sample[name] = (Path("/sys/fs/cgroup") / name).read_text().strip()[:500]
+        except OSError:
+            pass
+    _worker_memory_sample = sample
+    print("[worker-memory] " + json.dumps(sample, separators=(",", ":")), flush=True)
+
+
 def _record_worker_crash(*, exit_code: int | None, uptime_seconds: float, reason: str) -> None:
     WORKER_CRASH_PATH.parent.mkdir(parents=True, exist_ok=True)
     event = {
@@ -195,13 +222,21 @@ def _record_worker_crash(*, exit_code: int | None, uptime_seconds: float, reason
         "uptimeSeconds": round(max(0.0, uptime_seconds), 3),
         "restartCount": worker_restart_count,
         "reason": reason[:500],
+        "lastMemorySample": dict(_worker_memory_sample),
     }
+    try:
+        event["cgroupMemoryEventsAtExit"] = Path("/sys/fs/cgroup/memory.events").read_text().strip()[:500]
+    except OSError:
+        pass
     with WORKER_CRASH_PATH.open("a", encoding="utf-8") as handle:
         handle.write(json.dumps(event, ensure_ascii=False, separators=(",", ":")) + "\n")
 
 
 def _launch_worker(*, now: float | None = None) -> bool:
     global worker, worker_started_at, worker_last_exit_code
+    global _worker_memory_sample, _worker_memory_sample_at
+    _worker_memory_sample = {}
+    _worker_memory_sample_at = 0.0
     now = time.monotonic() if now is None else now
     cmd = _worker_command()
     print("starting submission worker: " + " ".join(cmd), flush=True)
@@ -227,6 +262,7 @@ def _supervise_worker(*, now: float | None = None) -> None:
     if worker is not None:
         return_code = worker.poll()
         if return_code is None:
+            _sample_worker_memory(now)
             if worker_started_at is not None and now - worker_started_at >= WORKER_STABLE_SECONDS:
                 worker_restart_count = 0
             return

modelhub_submmit_api/candidate_preflight.py

@@ -189,6 +189,7 @@ class CandidatePreflightAdvisor:
             "modelType": inspection.model_type,
             "architectures": inspection.architectures,
             "quantizationMethod": inspection.quantization_method,
+            "quantizationSignature": inspection.quantization_signature,
             "estimatedLoadBytes": inspection.estimated_load_bytes(framework),
             "repositoryOnDiskBytes": inspection.repository_size_bytes,
             "recursiveRepositoryBytes": inspection.exact_repository_size_bytes,
@@ -199,6 +200,11 @@ class CandidatePreflightAdvisor:
         with self._lock:
             self._assessed += 1
 
+        if framework != "llamacpp" and inspection.quantization_method in {"mlx", "unknown"}:
+            return self._hard_block(
+                config_params, "preflight_unverified_weight_format", warnings, ambiguous, metadata,
+            )
+
         learned_block = self._matching_architecture_block(
             inspection=inspection,
             target_gpu=target_gpu,

modelhub_submmit_api/history_stats.py

@@ -257,7 +257,7 @@ def classify_failure(record: dict[str, Any]) -> str:
     status = str(record.get("status") or "").lower()
     verify_result = _numeric_verify_result(record.get("verifyResult"))
     if status in {"failed", "error", "cancelled", "canceled", "rejected", "timeout"}:
-        return "参数/模板问题"
+        return "任务失败_原因未确认"
     if status in WAITING_STATUSES or status in RUNNING_STATUSES or verify_result is None:
         return "排队中/未知"
     if verify_result is not None and verify_result < 0:

modelhub_submmit_api/main.py

@@ -47,6 +47,7 @@ from official_capabilities import (
     OfficialCapabilityUnavailable,
 )
 from outcome_tracker import DEFAULT_OUTCOMES_PATH, OutcomeTracker
+from profile_admission import filter_profile_batch
 from routing_engine import DEFAULT_ROUTING_STATE_PATH, SuccessFirstRoutingEngine
 from submission_claims import DEFAULT_CLAIMS_PATH, SubmissionClaimStore, candidate_key, diversify_candidates
 from submission_exclusions import DEFAULT_SUBMISSION_EXCLUSIONS_PATH, SubmissionExclusionStore
@@ -737,6 +738,8 @@ def process_model_for_candidates(
         inspection = hf_discovery.inspect_model(model)
     except Exception as exc:
         return [], skipped, [{"repoId": model.repo_id, "reason": str(exc)}]
+    if "library:mlx" in {str(tag).lower() for tag in model.tags}:
+        inspection.model_card_metadata = {**inspection.model_card_metadata, "library_name": "mlx"}
 
     def evaluate_pending_routes(pending_routes: list[tuple[str, list[str], set[str]]]) -> int:
         before_count = len(candidates)
@@ -1703,6 +1706,7 @@ def run_submission(
             owner_id=instance_id,
         )
         attempted_keys: set[str] = set()
+        profile_stats = outcome_tracker.get_stats_report()
         attempt_multiplier = max(1, int(getattr(args, "scan_multiplier", 4) or 1))
         max_submit_attempts = min(
             len(diversified_candidates),
@@ -1721,6 +1725,13 @@ def run_submission(
                 and not submission_exclusion_store.is_blocked(candidate["repoId"], candidate["targetGpu"])
             ]
             remaining_candidates = one_candidate_per_model(remaining_candidates)
+            remaining_candidates, profile_deferred = filter_profile_batch(
+                remaining_candidates, outcome_tracker.pending_records(), profile_stats,
+            )
+            for candidate in profile_deferred:
+                attempted_keys.add(candidate_key(candidate))
+                skipped.append({"repoId": candidate["repoId"], "targetGpu": candidate["targetGpu"],
+                                "reason": "profile_feedback_deferred", "deferred": True})
             desired_count = min(
                 target_submit_count - len(submitted),
                 max_submit_attempts - len(attempted_candidates),

modelhub_submmit_api/models.py

@@ -4,6 +4,8 @@ from dataclasses import dataclass, field
 from datetime import datetime
 from pathlib import PurePosixPath
 from typing import Any
+import hashlib
+import json
 
 
 @dataclass(frozen=True)
@@ -114,13 +116,34 @@ class ModelInspection:
 
     @property
     def quantization_method(self) -> str | None:
+        if str(self.model_card_metadata.get("library_name") or "").lower() == "mlx":
+            return "mlx"
         value = self.model_config.get("quantization_config")
         if isinstance(value, dict):
             method = value.get("quant_method") or value.get("quantization_method")
             if method not in (None, ""):
                 return str(method).strip().lower()
+            if value:
+                return "unknown"
+        # MLX commonly uses a top-level quantization object, without
+        # quant_method. Never treat packed weights as ordinary FP weights.
+        value = self.model_config.get("quantization")
+        if isinstance(value, dict) and value:
+            if "bits" in value and "group_size" in value:
+                return "mlx"
+            return "unknown"
         return None
 
+    @property
+    def quantization_signature(self) -> str:
+        value = self.model_config.get("quantization_config") or self.model_config.get("quantization") or {}
+        if not isinstance(value, dict):
+            value = {}
+        # compressed-tensors covers several incompatible formats. Preserve
+        # the encoding configuration, not just its broad method name.
+        encoded = json.dumps(value, sort_keys=True, separators=(",", ":"), default=str)
+        return f"{self.quantization_method or 'none'}:{hashlib.sha256(encoded.encode()).hexdigest()[:16]}"
+
     @property
     def max_context_length(self) -> int | None:
         for key in (

modelhub_submmit_api/outcome_tracker.py

@@ -20,7 +20,7 @@ from common import append_jsonl, parse_datetime, read_json, read_jsonl, update_j
 from failure_log_inspector import fetch_and_classify_failure_log
 from history_stats import classify_failure, is_failure, is_success
 from llm_classifier import LLMAssistedClassifier
-from modelhub_client import ModelHubClient, ModelHubClientPool
+from modelhub_client import ModelHubClient, ModelHubClientPool, is_active_task
 from task_registry import task_type_from_history_task
 from common import runtime_instance_id
 from version import AGENT_VERSION
@@ -361,6 +361,31 @@ class OutcomeTracker:
                 pending_gpus.add(target_gpu)
         return len(pending_gpus)
 
+    def pending_records(self) -> list[dict[str, Any]]:
+        return [row for row in self._records if row.get("outcome") == "pending"]
+
+    def adopt_active_tasks(self, tasks, contexts=None) -> int:
+        """Adopt by task ID without inventing ownership or resubmitting work."""
+        adopted = 0
+        for task in tasks:
+            task_id = str(task.get("taskId") or "")
+            if not task_id or task_id in self._by_task_id or not is_active_task(task):
+                continue
+            enriched = self._enrich_history_task(task, (contexts or {}).get(task_id))
+            record = {"taskId": task_id, "modelId": enriched.get("modelId"),
+                      "targetGpu": enriched.get("gpuType"), "framework": enriched.get("framework"),
+                      "taskType": enriched.get("taskType") or task_type_from_history_task(enriched),
+                      "modelProfile": enriched.get("modelProfile") or {},
+                      "status": enriched.get("status"), "outcome": "pending",
+                      "submitTime": enriched.get("createTime") or enriched.get("submitTime"),
+                      "lastSyncTime": _now_iso()}
+            self._records.append(record)
+            self._by_task_id[task_id] = record
+            self._by_model_gpu[(record["modelId"], record["targetGpu"])].append(record)
+            append_jsonl(self.path, record)
+            adopted += 1
+        return adopted
+
     def mark_policy_cancellations(self, decisions: list[dict[str, Any]]) -> int:
         """Persist intentional task stops so they never become failure evidence."""
         marked = 0
@@ -760,11 +785,14 @@ class OutcomeTracker:
         framework_groups: dict[str, list[dict[str, Any]]] = defaultdict(list)
         combo_groups: dict[tuple[str, str, str], list[dict[str, Any]]] = defaultdict(list)
         profile_groups: dict[tuple[str, str, str, str, str], list[dict[str, Any]]] = defaultdict(list)
+        encoding_groups: dict[str, list[dict[str, Any]]] = defaultdict(list)
+        agent_groups: dict[str, list[dict[str, Any]]] = defaultdict(list)
         sized_profile_groups: dict[tuple[str, str, str, str, str, int], list[dict[str, Any]]] = defaultdict(list)
         recent_combo_groups: dict[tuple[str, str, str], list[dict[str, Any]]] = defaultdict(list)
         recent_profile_groups: dict[tuple[str, str, str, str, str], list[dict[str, Any]]] = defaultdict(list)
 
         for record in terminal:
+            agent_groups[str(record.get("agentVersion") or "unknown")].append(record)
             gpu = record.get("targetGpu") or "unknown"
             fw = record.get("framework") or "unknown"
             tt = record.get("taskType") or "unknown"
@@ -776,6 +804,8 @@ class OutcomeTracker:
             if model_type:
                 quantization = str(profile.get("quantizationMethod") or "none").strip()
                 profile_groups[(gpu, fw, tt, model_type, quantization)].append(record)
+                if profile.get("quantizationSignature"):
+                    encoding_groups[f"{gpu}|{fw}|{tt}|{model_type}|{profile['quantizationSignature']}"].append(record)
                 try:
                     load_bytes = max(1, int(profile.get("estimatedLoadBytes") or 0))
                 except (TypeError, ValueError):
@@ -914,6 +944,8 @@ class OutcomeTracker:
             "combinationStats": combination_stats,
             "recentCombinationStats": recent_combination_stats,
             "profileCombinationStats": profile_combination_stats,
+            "encodingCombinationStats": {key: _summarize(rows) for key, rows in encoding_groups.items()},
+            "agentSummaries": {key: _summarize(rows) for key, rows in agent_groups.items()},
             "recentProfileCombinationStats": recent_profile_combination_stats,
             "sizedProfileCombinationStats": sized_profile_combination_stats,
             "architectureCompatibilityBlocks": architecture_blocks,
@@ -944,6 +976,8 @@ class OutcomeTracker:
             "frameworkSummaries",
             "combinationStats",
             "profileCombinationStats",
+            "encodingCombinationStats",
+            "agentSummaries",
             "sizedProfileCombinationStats",
         ):
             base_items = baseline.get(field) if isinstance(baseline.get(field), dict) else {}

modelhub_submmit_api/poll_runner.py

@@ -668,6 +668,7 @@ def run_poll_loop(
     modelhub_client = modelhub_client or _build_modelhub_client(base_args)
     template_selector = template_selector or TemplateSelector()
 
+    active_tasks = []
     if state_sync is not None and state_sync.healthy:
         try:
             active_tasks = (
@@ -698,6 +699,8 @@ def run_poll_loop(
         ledger_path=Path(base_args.ledger_path),
     )
     repaired_contexts = outcome_tracker.merge_task_contexts(recovered_contexts)
+    adopted = outcome_tracker.adopt_active_tasks(active_tasks, recovered_contexts)
+    log(f"[takeover] active_adopted={adopted} existing_queue=preserved ownership=unchanged")
     if repaired_contexts:
         log(f"[outcome-recovery] metadata_repaired={repaired_contexts}")
     OUTCOME_SYNC_INTERVAL = 3
@@ -889,6 +892,12 @@ def run_poll_loop(
                 if synced > 0:
                     log(f"[poll] cycle={cycles} outcome_sync_updated={synced}")
                 sync_feedback = outcome_tracker.get_stats_report()
+                own = (sync_feedback.get("agentSummaries") or {}).get(AGENT_VERSION) or {}
+                own_pending = sum(row.get("agentVersion") == AGENT_VERSION
+                                  for row in outcome_tracker.pending_records())
+                log(f"[feedback] version={AGENT_VERSION} success={own.get('successCount', 0)} "
+                    f"failed={own.get('failureCount', 0)} pending={own_pending} "
+                    f"unknown_failures={own.get('unresolvedFailureCount', 0)}")
                 active_block_keys = _persist_architecture_blacklist(
                     sync_feedback,
                     path=Path(

modelhub_submmit_api/profile_admission.py

@@ -0,0 +1,41 @@
+"""Bound unproven sibling routes while awaiting actual validation results."""
+from collections import Counter
+from typing import Any
+
+
+def profile_key(row: dict[str, Any]) -> tuple[str, ...] | None:
+    profile = row.get("preflightMetadata") or row.get("modelProfile") or {}
+    model_type = str(profile.get("modelType") or "").strip()
+    if not model_type:
+        return None
+    return (str(row.get("targetGpu") or row.get("gpuType") or ""),
+            str(row.get("framework") or ""), str(row.get("taskType") or ""),
+            model_type, str(profile.get("quantizationSignature") or profile.get("quantizationMethod") or "none"))
+
+
+def filter_profile_batch(candidates, pending, stats, *, limit=2):
+    """Reservations include the whole proposed batch; deferred rows are retryable.
+
+    Broad public framework statistics are not proof for a specific encoding.
+    Exact-encoding successes can lift the cap, provided the observed success
+    rate remains at least 50%. Missing legacy signatures cannot grant this.
+    """
+    counts = Counter(profile_key(row) for row in pending if row.get("outcome") == "pending")
+    selected, deferred = [], []
+    for candidate in candidates:
+        key = profile_key(candidate)
+        evidence = (stats.get("encodingCombinationStats") or {}).get("|".join(key or ())) or {}
+        successes = int(evidence.get("successCount") or 0)
+        failures = max(0, int(evidence.get("failureCount") or 0) - int(evidence.get("platformFailureCount") or 0))
+        proven = successes >= 3 and successes / max(1, successes + failures) >= 0.5
+        # Count legacy records with the same method as well, conservatively.
+        legacy = 0
+        if key and ":" in key[-1]:
+            legacy = counts.get((*key[:-1], key[-1].split(":", 1)[0]), 0)
+        if key and not proven and counts[key] + legacy >= limit:
+            deferred.append(candidate)
+            continue
+        selected.append(candidate)
+        if key:
+            counts[key] += 1
+    return selected, deferred

modelhub_submmit_api/routing_engine.py

@@ -189,8 +189,8 @@ class SuccessFirstRoutingEngine:
         selected.sort(
             key=lambda item: (
                 -int(item["routingSuccessBand"]),
-                -int(item.get("routingCommunityModelSuccesses") or 0),
                 -float(item["routingExpectedSuccessPerHour"]),
+                -int(item.get("routingCommunityModelSuccesses") or 0),
                 -int(item["routingSamples"]),
                 -int(item.get("downloads") or 0),
                 str(item.get("repoId") or ""),

modelhub_submmit_api/state_sync.py

@@ -8,6 +8,9 @@ import os
 import shutil
 import tempfile
 import threading
+import time
+from contextlib import ExitStack
+from itertools import islice
 import uuid
 import re
 from datetime import datetime, timedelta, timezone
@@ -171,6 +174,8 @@ class StateGitSync:
         self._pending_push_oid: str | None = None
         self._pending_generation: int | None = None
         self._pending_manifest: dict[str, Any] | None = None
+        self._last_success_monotonic = 0.0
+        self._refresh_workspace_pending = False
 
     @property
     def state_dir(self) -> Path:
@@ -236,7 +241,7 @@ class StateGitSync:
         parent = Path(tempfile.mkdtemp(prefix="modelhub-agent-state-"))
         workspace = parent / "state"
         if remote_oid:
-            porcelain.clone(
+            cloned = porcelain.clone(
                 self.remote,
                 workspace,
                 branch=self.branch,
@@ -245,10 +250,11 @@ class StateGitSync:
                 errstream=io.BytesIO(),
                 **self._auth_kwargs(),
             )
+            cloned.close()
         else:
             workspace.mkdir(parents=True)
-            repo = porcelain.init(workspace)
-            repo.refs.set_symbolic_ref(b"HEAD", f"refs/heads/{self.branch}".encode("utf-8"))
+            with porcelain.init(workspace) as repo:
+                repo.refs.set_symbolic_ref(b"HEAD", f"refs/heads/{self.branch}".encode("utf-8"))
         self._workspace = workspace
         self._expected_remote_oid = remote_oid
 
@@ -268,7 +274,7 @@ class StateGitSync:
         return manifest
 
     def restore(self) -> bool:
-        with self._mutex:
+        with self._mutex, ExitStack() as resources:
             try:
                 remote_oid = self._remote_oid()
                 self._create_workspace(remote_oid)
@@ -277,7 +283,7 @@ class StateGitSync:
                         manifest = self._validate_manifest(self._workspace)
                     except Exception as current_error:
                         manifest = None
-                        repo = Repo(str(self._workspace))
+                        repo = resources.enter_context(Repo(str(self._workspace)))
                         commits = [entry.commit.id for entry in repo.get_walker(max_entries=self.history_depth)][1:]
                         for commit in commits:
                             porcelain.reset(repo, "hard", commit)
@@ -627,7 +633,10 @@ class StateGitSync:
         if self._pending_push_oid is None:
             return True
         assert self._workspace is not None
-        repo = Repo(str(self._workspace))
+        with Repo(str(self._workspace)) as repo:
+            return self._push_pending_repo(repo, phase=phase)
+
+    def _push_pending_repo(self, repo: Repo, *, phase: str) -> bool:
         remote_oid = self._remote_oid()
         if remote_oid == self._pending_push_oid:
             pushed = True
@@ -655,11 +664,12 @@ class StateGitSync:
         self._pending_manifest = None
         self.last_error = None
         self.healthy = True
+        self._last_success_monotonic = time.monotonic()
         self.log(f"[state-sync] generation={self.generation} phase={phase} status=ok")
         return True
 
     def sync(self, phase: str) -> bool:
-        with self._mutex:
+        with self._mutex, ExitStack() as resources:
             try:
                 if self._workspace is None:
                     raise StateSyncError("state workspace is not initialized")
@@ -667,6 +677,13 @@ class StateGitSync:
                 # another commit or generation for the same state transition.
                 if self._pending_push_oid is not None:
                     return self._push_pending(phase=phase)
+                # Intent/result WAL writes are never throttled. Idle/full
+                # cycles need not rewrite multi-megabyte state every 15s.
+                if (self.healthy and phase in {"cycle", "cycle_no_slots"}
+                        and time.monotonic() - self._last_success_monotonic < 60):
+                    return True
+                if self._refresh_workspace_pending:
+                    self._refresh_local_workspace()
                 previous_manifest: dict[str, Any] = {}
                 try:
                     previous_manifest = read_json(self._workspace / "manifest.json")
@@ -691,7 +708,7 @@ class StateGitSync:
                     "checksums": checksums,
                 }
                 write_json(self._workspace / "manifest.json", manifest)
-                repo = Repo(str(self._workspace))
+                repo = resources.enter_context(Repo(str(self._workspace)))
                 porcelain.add(repo)
                 status = porcelain.status(repo)
                 staged = any(status.staged.get(kind) for kind in ("add", "delete", "modify"))
@@ -704,7 +721,7 @@ class StateGitSync:
                     author=self._author,
                     committer=self._author,
                 )
-                commit_count = sum(1 for _ in repo.get_walker())
+                commit_count = sum(1 for _ in islice(repo.get_walker(), self.history_depth + 1))
                 if commit_count > self.history_depth:
                     branch_ref = f"refs/heads/{self.branch}".encode("utf-8")
                     del repo.refs[branch_ref]
@@ -715,6 +732,7 @@ class StateGitSync:
                         author=self._author,
                         committer=self._author,
                     )
+                    self._refresh_workspace_pending = True
                 local_oid = repo.head().decode("ascii")
                 self._pending_push_oid = local_oid
                 self._pending_generation = next_generation
@@ -726,6 +744,32 @@ class StateGitSync:
                 self.log(f"[state-sync] phase={phase} status=failed reason={self.last_error}")
                 return False
 
+    def _refresh_local_workspace(self) -> None:
+        """After a verified orphan push, discard unreachable *local* objects.
+
+        Merely resetting the branch bounds history but leaves old blobs on
+        disk. Rotate only this class's disposable workspace after verification.
+        """
+        old = self._workspace
+        parent = Path(tempfile.mkdtemp(prefix="modelhub-agent-state-"))
+        replacement = parent / "state"
+        try:
+            with porcelain.clone(self.remote, replacement, branch=self.branch, depth=1,
+                                 errstream=io.BytesIO(), **self._auth_kwargs()) as repo:
+                if repo.head().decode("ascii") != self._expected_remote_oid:
+                    raise StateSyncError("state changed during local workspace rotation")
+            self._validate_manifest(replacement)
+        except Exception:
+            shutil.rmtree(parent)
+            raise
+        self._workspace = replacement
+        self._refresh_workspace_pending = False
+        if (old is not None and old.name == "state"
+                and old.parent.name.startswith("modelhub-agent-state-")
+                and old.parent.parent == Path(tempfile.gettempdir())):
+            shutil.rmtree(old.parent)
+        self.log("[state-sync] local_workspace=rotated unreachable_objects=discarded")
+
     def write_readiness(self, *, ready: bool, reason: str | None = None, extra: dict[str, Any] | None = None) -> None:
         body = {
             "ready": bool(ready),

modelhub_submmit_api/version.py

@@ -1 +1 @@
-AGENT_VERSION = "2026.10.18.1"
+AGENT_VERSION = "2026.10.26.1"

tests/test_takeover_accuracy.py

@@ -0,0 +1,114 @@
+import copy
+import sys
+import tempfile
+import unittest
+from pathlib import Path
+from unittest.mock import patch
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[1] / "modelhub_submmit_api"))
+from models import ModelInspection
+from candidate_preflight import CandidatePreflightAdvisor
+from profile_admission import filter_profile_batch, profile_key
+from outcome_tracker import OutcomeTracker
+from common import write_json
+from state_sync import StateGitSync
+from dulwich import porcelain
+
+
+class TakeoverAccuracyTests(unittest.TestCase):
+    def tracker(self, root):
+        return OutcomeTracker(root / "outcomes.jsonl", checkpoint_path=root / "checkpoint.json",
+                              recent_path=root / "recent.jsonl")
+
+    def test_mlx_and_unknown_quantization_not_plain_weights(self):
+        for config, expected in [({"quantization": {"bits": 4, "group_size": 64}}, "mlx"),
+                                 ({"quantization_config": {"bits": 4}}, "unknown")]:
+            inspection = ModelInspection(repo_id="owner/model", model_config=config)
+            self.assertEqual(expected, inspection.quantization_method)
+            advisor = CandidatePreflightAdvisor()
+            result = advisor.assess(inspection=inspection, task_type="text-generation",
+                                    target_gpu="MetaX_c-500", framework="vllm", config_params="x")
+            self.assertFalse(result.allowed)
+            self.assertEqual("preflight_unverified_weight_format", result.reason)
+        self.assertEqual("mlx", ModelInspection(repo_id="m", model_card_metadata={
+            "library_name": "mlx"}).quantization_method)
+        self.assertIsNone(ModelInspection(repo_id="m", model_config={}).quantization_method)
+
+    def test_encoding_fingerprints_distinguish_compressed_formats(self):
+        a = ModelInspection(repo_id="a", model_config={"quantization_config": {
+            "quant_method": "compressed-tensors", "format": "float-quantized"}})
+        b = ModelInspection(repo_id="b", model_config={"quantization_config": {
+            "quant_method": "compressed-tensors", "format": "pack-quantized"}})
+        self.assertNotEqual(a.quantization_signature, b.quantization_signature)
+
+    def candidate(self, model="a"):
+        return {"repoId": model, "targetGpu": "gpu", "framework": "vllm", "taskType": "text-generation",
+                "preflightMetadata": {"modelType": "family", "quantizationSignature": "awq:abc"}}
+
+    def test_batch_guard_counts_pending_and_same_batch_and_is_retryable(self):
+        candidate = self.candidate()
+        pending = {**candidate, "outcome": "pending"}
+        selected, deferred = filter_profile_batch([self.candidate(str(i)) for i in range(4)], [pending], {})
+        self.assertEqual(1, len(selected))
+        self.assertEqual(3, len(deferred))
+        selected, deferred = filter_profile_batch(deferred, [], {})
+        self.assertEqual(2, len(selected))
+
+    def test_proven_encoding_releases_cap_but_failures_do_not(self):
+        candidates = [self.candidate(str(i)) for i in range(4)]
+        key = "|".join(profile_key(candidates[0]))
+        stats = {"encodingCombinationStats": {key: {"successCount": 3, "failureCount": 0}}}
+        self.assertEqual(4, len(filter_profile_batch(candidates, [], stats)[0]))
+        stats["encodingCombinationStats"][key]["failureCount"] = 10
+        self.assertEqual(2, len(filter_profile_batch(candidates, [], stats)[0]))
+
+    def test_takeover_is_idempotent_and_does_not_invent_version(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            tracker = self.tracker(Path(tmp))
+            tasks = [{"taskId": "old", "modelId": "owner/model", "gpuType": "gpu", "status": "waiting"}]
+            self.assertEqual(1, tracker.adopt_active_tasks(tasks))
+            self.assertEqual(0, tracker.adopt_active_tasks(tasks))
+            self.assertEqual(1, tracker.pending_route_count_for_model("owner/model"))
+            self.assertNotIn("agentVersion", tracker.pending_records()[0])
+
+    def test_encoding_and_version_statistics_survive_compaction(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            root = Path(tmp)
+            tracker = self.tracker(root)
+            for i in range(3):
+                tracker.record_submission("m"+str(i), "gpu", "vllm", "text-generation", str(i),
+                    "2026-10-26T00:00:00+00:00", self.candidate()["preflightMetadata"])
+                tracker._update_record_from_task(tracker._by_task_id[str(i)], {"status": "success", "verifyResult": 1})
+            before = tracker.get_stats_report()
+            tracker._compact_if_needed(force=True)
+            restored = self.tracker(root).get_stats_report()
+            self.assertEqual(before["encodingCombinationStats"], restored["encodingCombinationStats"])
+            self.assertEqual(before["agentSummaries"], restored["agentSummaries"])
+
+    def test_state_rotation_preserves_remote_and_bounds_local_objects(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            root = Path(tmp)
+            remote = root / "remote.git"
+            with porcelain.init(remote, bare=True):
+                pass
+            project = root / "project"
+            project.mkdir()
+            manager = StateGitSync(project_root=project, credentials={"username": "u", "email": "u@x", "password": "p"},
+                                   remote=str(remote), history_depth=2, log_fn=lambda _: None)
+            try:
+                self.assertTrue(manager.restore())
+                for i in range(5):
+                    write_json(project / ".modelhub_state/account_capacity.json", {"generation": i})
+                    self.assertTrue(manager.sync("result"), manager.last_error)
+                self.assertTrue(manager.healthy)
+                self.assertEqual(manager._expected_remote_oid, manager._remote_oid())
+                with patch.object(manager, "_copy_snapshot", side_effect=AssertionError("idle writes should throttle")):
+                    self.assertTrue(manager.sync("cycle_no_slots"))
+                write_json(project / ".modelhub_state/account_capacity.json", {"generation": 99})
+                self.assertTrue(manager.sync("intent"))
+            finally:
+                manager.close()
+
+
+if __name__ == "__main__":
+    unittest.main()