diff --git a/src/sdlc_hub/core/http.py b/src/sdlc_hub/core/http.py
index 76c590f..4abe2ef 100644
--- a/src/sdlc_hub/core/http.py
+++ b/src/sdlc_hub/core/http.py
@@ -30,6 +30,12 @@ def int_group(m, i=1) -> int:
     return int(m.group(i))
 
 
+def is_digits(value) -> bool:
+    """Непустая строка только из ASCII-цифр 0-9. str.isdigit() принимает «²» и арабо-индийские цифры, на которых int()
+    падает (#86 F.1); идентификаторы из цифр проверять только этим."""
+    return isinstance(value, str) and value.isascii() and value.isdigit()
+
+
 def int_param(q, name, default) -> int:
     try:
         return int(q.get(name, default))
diff --git a/src/sdlc_hub/modules/jira/attachments.py b/src/sdlc_hub/modules/jira/attachments.py
index 633e8ee..743fe42 100644
--- a/src/sdlc_hub/modules/jira/attachments.py
+++ b/src/sdlc_hub/modules/jira/attachments.py
@@ -4,6 +4,7 @@
 import re
 
 from ...core import files
+from ...core.http import is_digits
 
 # lookahead: совпадения перекрываются, поэтому одиночный «!» ранее в тексте не съедает открывающий «!» настоящей ссылки;
 # после открывающего «!» пробела нет (как в Jira), иначе закрывающий «!» одной картинки породил бы ложное имя
@@ -40,7 +41,7 @@ def ref_names(text: str | None) -> list[str]:
 
 def _newest_key(item: dict):
     aid = str(item["attachment_id"])
-    return item.get("created_at") or "", int(aid) if aid.isdigit() else -1, aid
+    return item.get("created_at") or "", int(aid) if is_digits(aid) else -1, aid
 
 
 def resolve(names: list[str], items: list[dict]) -> list[str]:
diff --git a/src/sdlc_hub/modules/jira/fetch.py b/src/sdlc_hub/modules/jira/fetch.py
index 79a4a1a..780b190 100644
--- a/src/sdlc_hub/modules/jira/fetch.py
+++ b/src/sdlc_hub/modules/jira/fetch.py
@@ -1,6 +1,7 @@
 """Скачивание вложения из Jira по запросу (fetch_attachment): постановка в очередь и ошибки постановки."""
 from ...core import db, queue
 from ...core.errors import CommandError, HttpMapped
+from ...core.http import is_digits
 from . import attachments, commands
 
 FETCH_AGENT_VERSION = 14        # первая версия агента с fetch_attachment
@@ -31,7 +32,7 @@ def request_fetch(conn, files_dir, attachment_id: str, author: str | None) -> di
         if info["state"] in ("ready", "fetching"):
             return info
         v = queue.agent_version(conn, "jira")
-        if v is not None and str(v).isdigit() and int(v) < FETCH_AGENT_VERSION:    # версия неизвестна — не блокируем
+        if v is not None and is_digits(str(v)) and int(v) < FETCH_AGENT_VERSION:    # версия неизвестна — не блокируем
             raise AgentTooOld(f"агент v{v} не умеет скачивать вложения — нужен v{FETCH_AGENT_VERSION}")
         cmds = commands.validate([{"type": "fetch_attachment", "params": {"key": info["key"], "attachment_id": attachment_id}}])
         hooks.check_setup(conn, cmds, files_dir)
diff --git a/src/sdlc_hub/modules/jira/history.py b/src/sdlc_hub/modules/jira/history.py
index 7721b01..256a62e 100644
--- a/src/sdlc_hub/modules/jira/history.py
+++ b/src/sdlc_hub/modules/jira/history.py
@@ -4,6 +4,7 @@ from datetime import datetime, timedelta, timezone
 
 from . import projects
 from ...core import db, settings
+from ...core.http import is_digits
 
 SINCE_MARGIN = timedelta(minutes=15)      # расхождение часов Mac mini и Jira и длительность прогона (design #5)
 
@@ -14,7 +15,7 @@ def jira_utc(value) -> str | None:
     if not isinstance(value, str) or not value:
         return None
     s = value[:-1] + "+00:00" if value.endswith("Z") else value
-    if len(s) > 5 and s[-5] in "+-" and s[-4:].isdigit():          # ±HHMM → ±HH:MM
+    if len(s) > 5 and s[-5] in "+-" and is_digits(s[-4:]):          # ±HHMM → ±HH:MM
         s = s[:-2] + ":" + s[-2:]
     try:
         d = datetime.fromisoformat(s)
diff --git a/src/sdlc_hub/modules/jira/hooks.py b/src/sdlc_hub/modules/jira/hooks.py
index 17e2a9e..c9a1175 100644
--- a/src/sdlc_hub/modules/jira/hooks.py
+++ b/src/sdlc_hub/modules/jira/hooks.py
@@ -3,6 +3,7 @@ import json
 import logging
 
 from ...core import files, projects, queue, settings
+from ...core.http import is_digits
 from ...core.errors import CommandError
 from ...core.modules import CommandHooks
 from . import attachments, commands, history, mirror, refresh
@@ -40,7 +41,7 @@ def check_setup(conn, cmds, files_dir) -> None:
                 # кавычка, CR, LF ломают заголовок части multipart/form-data у агента (R-2)
                 raise CommandError(f"команда {i}: filename без кавычек и управляющих символов (CR, LF и др.)")
         if c["type"] == "fetch_attachment":
-            if not p["attachment_id"].isdigit():
+            if not is_digits(p["attachment_id"]):
                 raise CommandError(f"команда {i}: attachment_id — цифры id вложения из issue")
             row = conn.execute("SELECT size FROM issue_attachment WHERE attachment_id = ? AND key = ?",
                                (p["attachment_id"], p["key"])).fetchone()
diff --git a/src/sdlc_hub/modules/jira/mcp.py b/src/sdlc_hub/modules/jira/mcp.py
index 3120304..70efa36 100644
--- a/src/sdlc_hub/modules/jira/mcp.py
+++ b/src/sdlc_hub/modules/jira/mcp.py
@@ -15,6 +15,7 @@ from mcp.server.fastmcp import FastMCP
 from ...core import mcp as core
 from ...core.client import HubError
 from ...core.files import MAX_SIZE
+from ...core.http import is_digits
 from .attachments import fmt_size
 from .commands import describe, is_temp
 
@@ -46,7 +47,7 @@ def fmt_day(value) -> str:
     text = value.strip()
     if text.endswith(("Z", "z")):
         text = text[:-1] + "+00:00"
-    if len(text) > 5 and text[-5] in "+-" and text[-4:].isdigit():
+    if len(text) > 5 and text[-5] in "+-" and is_digits(text[-4:]):
         text = text[:-2] + ":" + text[-2:]
     try:
         at = datetime.fromisoformat(text)
@@ -218,7 +219,7 @@ DATE_LABELS = {"duedate": "срок", "planned_start": "плановое нач
 
 def _day(value, text) -> str:
     """Дата для ленты: из значения вида ГГГГ-ММ-ДД — «ДД.ММ», иначе строка журнала как есть, пусто — «—»."""
-    if isinstance(value, str) and len(value) >= 10 and value[4] == "-" and value[7] == "-" and value[:4].isdigit():
+    if isinstance(value, str) and len(value) >= 10 and value[4] == "-" and value[7] == "-" and is_digits(value[:4]):
         return f"{value[8:10]}.{value[5:7]}"
     return core.value(text)
 
@@ -346,7 +347,7 @@ async def attachment(key: str, attachment: str, wait_seconds: int = 120) -> str:
     d = await asyncio.to_thread(client.get, f"/issues/{key}")
     atts = d.get("attachments") or []
     ref = attachment.strip().lstrip("#")
-    found = [a for a in atts if str(a["attachment_id"]) == ref] if ref.isdigit() else []
+    found = [a for a in atts if str(a["attachment_id"]) == ref] if is_digits(ref) else []
     prefix = ""
     if not found:
         want = unicodedata.normalize("NFC", attachment.strip())
diff --git a/src/sdlc_hub/modules/jira/mirror.py b/src/sdlc_hub/modules/jira/mirror.py
index 90da1a3..59f7b2a 100644
--- a/src/sdlc_hub/modules/jira/mirror.py
+++ b/src/sdlc_hub/modules/jira/mirror.py
@@ -5,6 +5,7 @@ import math
 
 from . import attachments, history, projects
 from ...core import db
+from ...core.http import is_digits
 
 ISSUE_COLUMNS = ["key", "id", "issue_type", "summary", "description", "status", "priority", "assignee", "reporter",
                  "duedate", "planned_start", "planned_end", "epic_key", "labels", "sprint", "created", "jira_updated"]
@@ -43,7 +44,7 @@ def check_attachments(issues) -> None:
             where = f"{key}: attachments[{n}]"
             if not isinstance(a, dict):
                 raise ValueError(f"{where} — объект вложения")
-            if not isinstance(a.get("id"), str) or not a["id"].isdigit():
+            if not is_digits(a.get("id")):
                 raise ValueError(f"{where}.id — строка из цифр")
             if not isinstance(a.get("filename"), str) or not a["filename"]:
                 raise ValueError(f"{where}.filename — непустая строка")
diff --git a/tests/test_api.py b/tests/test_api.py
index a99f414..74cf6e5 100644
--- a/tests/test_api.py
+++ b/tests/test_api.py
@@ -1188,6 +1188,26 @@ def test_batches_post_fetch_too_large_413(hub):
     assert hub["client"].get("/batches")["batches"] == []
 
 
+@pytest.mark.parametrize("bad", ["²", "١٢", 7])
+def test_batches_post_fetch_attachment_id_not_ascii_digits_422(hub, bad):
+    """#86 F.1: attachment_id из не-ASCII цифр или числом — 422, не 500; пакет не создан."""
+    _seed_attachment(hub)
+    with pytest.raises(HubError) as e:
+        hub["client"].post("/batches", {"title": "x", "commands": [
+            {"type": "fetch_attachment", "params": {"key": "A-1", "attachment_id": bad}}]})
+    assert e.value.status == 422
+    assert hub["client"].get("/batches")["batches"] == []
+
+
+@pytest.mark.parametrize("bad_id", ["²", 7])
+def test_agent_state_attachment_id_ascii_only_422(hub, bad_id):
+    """#86 F.1: id вложения в состоянии агента — только строка из ASCII-цифр (ascii digit)."""
+    with pytest.raises(HubError) as e:
+        hub["agent"].post("/agent/state", {"issues": [{"key": "Y-1", "summary": "Игрек", "labels": [],
+                                                        "attachments": [{"id": bad_id, "filename": "a"}]}], "links": []})
+    assert e.value.status == 422 and e.value.error == "bad_state"
+
+
 def test_command_retry_fetch_too_large_413(hub):
     """M-2: повтор fetch_attachment, когда размер в зеркале вырос выше предела, — 413 too_large."""
     _seed_attachment(hub)
diff --git a/tests/test_attachments.py b/tests/test_attachments.py
index 8018dea..d6db28b 100644
--- a/tests/test_attachments.py
+++ b/tests/test_attachments.py
@@ -93,3 +93,9 @@ def test_state_failed_and_cancelled(conn, tmp_path):
 
 def test_get_missing(conn, tmp_path):
     assert attachments.get(conn, tmp_path, "999") is None
+
+
+def test_newest_key_non_ascii_digit_goes_last_ascii():
+    """#86 F.1: id «²» не бросает в int() и уходит в хвост, как нецифровой (ascii digit)."""
+    assert attachments._newest_key({"attachment_id": "²", "created_at": "t"}) == ("t", -1, "²")
+    assert attachments._newest_key({"attachment_id": "12", "created_at": "t"}) == ("t", 12, "12")
diff --git a/tests/test_commands.py b/tests/test_commands.py
index b9393e6..6eec392 100644
--- a/tests/test_commands.py
+++ b/tests/test_commands.py
@@ -378,3 +378,10 @@ def test_normalize_summary_description_goal_untouched():
     out = commands.validate([{"type": "ensure_issue", "params": {"temp_key": "new:1", "issue_type": "task",
                                                                   "summary": " Т ", "description": "  d\n"}}])
     assert out[0]["params"]["summary"] == " Т " and out[0]["params"]["description"] == "  d\n"
+
+
+def test_is_digits_ascii_only():
+    from sdlc_hub.core.http import is_digits
+    assert is_digits("123") is True
+    for bad in ("", "²", "١٢", "12a", 7, None):
+        assert is_digits(bad) is False
diff --git a/tests/test_mirror.py b/tests/test_mirror.py
index 78c5558..3bf15fd 100644
--- a/tests/test_mirror.py
+++ b/tests/test_mirror.py
@@ -369,6 +369,7 @@ def test_attachment_moves_to_other_key(conn):
 @pytest.mark.parametrize("bad, field", [
     ("x", "attachments"), (["x"], "attachments[0]"),
     ([{"id": "", "filename": "a"}], "attachments[0].id"), ([{"id": "1a", "filename": "a"}], "attachments[0].id"),
+    ([{"id": "²", "filename": "a"}], "attachments[0].id"), ([{"id": "١٢", "filename": "a"}], "attachments[0].id"),
     ([{"id": "-5", "filename": "a"}], "attachments[0].id"), ([{"id": 5, "filename": "a"}], "attachments[0].id"),
     ([{"id": "5", "filename": 1}], "attachments[0].filename"), ([{"id": "5", "filename": ""}], "attachments[0].filename"),
     ([{"id": "5", "filename": "a", "size": -1}], "attachments[0].size"),
diff --git a/tests/test_queue.py b/tests/test_queue.py
index 5f95a77..62bfaf2 100644
--- a/tests/test_queue.py
+++ b/tests/test_queue.py
@@ -1287,6 +1287,12 @@ def test_request_fetch_agent_too_old(fconn, tmp_path):
     assert jira_fetch.request_fetch(fconn, tmp_path / "files", "31337", "x")["state"] == "fetching"
 
 
+def test_request_fetch_agent_version_not_ascii_digits_ascii(fconn, tmp_path):
+    """#86 F.1: версия агента «²» — неизвестная, не блокирует и не бросает ValueError (ascii digit)."""
+    fconn.execute("UPDATE agent_status SET agent_version = '²' WHERE agent = 'jira'")
+    assert jira_fetch.request_fetch(fconn, tmp_path / "files", "31337", "x")["state"] == "fetching"
+
+
 def test_request_fetch_after_failed(fconn, tmp_path):
     root = tmp_path / "files"
     first = jira_fetch.request_fetch(fconn, root, "31337", "x")